Research Progress

Researchers Propose a Novel FTO Route with Ultrahigh Carbon Efficiency

A research team led by Prof. ZHONG Liangshu at Shanghai Advanced Research Institute (SARI) of Chinese Academy of Sciences reported a non-classical Fischer-Tropsch to olefins (FTO) process featuring high carbon efficiency that realizes 80.1% olefins selectivity with ultralow total selectivity of CH4 and CO2 (<5%) at CO conversion of 45.8%.

Olefins are key building blocks to manufacture a wide range of value-added products such as polymers, lubricants, plasticizers, drugs, detergent and cosmetics. Syngas conversion serves as a competitive strategy to produce olefins from nonpetroleum resources. However, the goal to achieve desirable olefins selectivity with limited undesired C1 by-products remains a grand challenge.Motivated by such a challenge, a research team led by Prof. ZHONG Liangshu at the Shanghai Advanced Research Institute (SARI) of the Chinese Academy of Sciences reported a non-classical Fischer-Tropsch to olefins (FTO) process featuring high carbon efficiency that realizes 80.1% olefins selectivity with ultralow total selectivity of CH4 and CO2 (<5%) at CO conversion of 45.8%.The results were published in Nature Communications on 10 October 2022.The researchers prepared a silica-supported Ru nanoparticles catalyst with sodium (Na) as promoter (denoting as Na-Ru/SiO2), which was highly active for FTO reaction but very inactive for water-gas-shift (WGS) reaction.With various characterizations and surface probe reaction experiments, the Ru metal is demonstrated to be the active phase, and the Na promoter can suppress the reactivity of chemisorbed H atoms on Ru surface sites while greatly promote the production of olefins, especially for long-chain α-olefins (C5+=), whose fraction in olefins distribution reached up to 74.5%.No obvious deactivation is observed within 550 hours and the pellet catalyst also exhibits excellent catalytic performance in a pilot-scale reactor, suggesting promising practical applications.The results of this work demonstrate that the modified-metallic Ru can effectively tune the dominated product distribution from traditional paraffins to value-added olefins. The as-obtained catalytic performance exhibits the highest olefins (especial for C5+=) selectivity and yield together with the lowest fraction of undesired C1 by-products including CH4 and CO2, which outperforms the reported results under all the CO conversion levels in the previous references.The ultrahigh selectivity and yield of olefins as well as the limited production of C1 by-products enables a considerable carbon efficiency for the current FTO route, and also represents a big step toward the application of Ru-based catalysts for direct production of olefins, especially for long-chain olefins, from syngas.
  Catalytic performance for direct syngas conversion to olefins over Na-modified Ru-based catalyst
   (Image by SARI)
  

2022-10-12 more+

Researchers Develop Synergistic Catalysts of Ru single-atoms and Zeolite for High-efficiency Hydrogen Storage

A research team led by Prof. CHEN Xinqing at Shanghai Advanced Research Institute (SARI) of the Chinese Academy of Sciences developed a new strategy utilizing Ru single atoms and *BEA zeolite to synergistically catalyze hydrogen storage of liquid organic hydrogen carriers (LOHCs) with superior performance.

Hydrogen energy is regarded as promising renewable energy to deal with the crises of energy resources. However, the development of hydrogen energy is greatly restricted by the safe and efficient storage and transportation of hydrogen. Therefore, it remains a great challenge to explore the feasibility of high-efficiency catalysts with low-cost in hydrogen storage under low temperature.
  Motivated by such a challenge, a research team led by Prof. CHEN Xinqing at Shanghai Advanced Research Institute (SARI) of the Chinese Academy of Sciences developed a new strategy utilizing Ru single atoms and *BEA zeolite to synergistically catalyze hydrogen storage of liquid organic hydrogen carriers (LOHCs) with superior performance.
  The research results were published in Applied Catalysis B: Environmental.
  Atomically dispersed Ru supported on *BEA zeolite was prepared by deposition precipitation for LOHCs. It is found that highly dispersed Ru single-atoms boost hydrogen activation and the strong acid sites of zeolites promote the hydrogen spillover on the hydrogenation with N-heterocycles.
  Moreover, the synergistic effect of Ru single atoms and *BEA zeolite is crucial for accelerating the hydrogenation rate and lowering the activation energy compared with traditional Ru-based catalysts.
  The synergistic catalysis of Ru single-atoms and zeolite with the assistance of hydrogen spillover exhibited excellent hydrogenation activity of N-ethylcarbazole (NEC), N-propylcarbazole (NPC), and 2-methylindole (2-MID) at lower temperatures with lower Ru content (0.5 wt%).
  The study of Ru single-atoms and zeolite synergistic catalysis provides a new strategy for the synergetic catalysis of zeolite-supported metal catalysts for fast hydrogen storage into aromatic LOHCs under mild conditions.
  Hydrogenation performance of N-ethylcarbazole (NEC) of different catalysts and comparison results of literature 
  (Image by SARI)
  Cotact: CHEN Xinqing
  Shanghai Advanced Research Institute
  chenxq@sari.ac.cn
  

2022-09-28 more+

Researchers Develop a Novel Spectrum Sensing Technique for 6G-Oriented Intelligent IoT Communications

A joint research team creatively proposed a novel spectrum sensing technique for 6g-oriented intelligent IoT communications, seeking a feasible way to provide the underlying support for perceptual interference and intelligent identification between large-scale coexistence and aliasing IoT users in future 6G scenario.

With the explosive growth of the spectrum demand of the Internet of Things (IoT), Non-orthogonal Multiple Access (NOMA) and spectrum sensing are considered to be key candidate technologies to improve spectrum utilization in next generation wireless communications technology.However, given the complexity of future IoT scenarios, it brings new challenges on how to ensure the performance of spectrum utilization and system throughput in large-scale IoT scenarios when using both technologies at the same time.Motivated by such a challenge, a joint research team composed of researchers from Shanghai Advanced Research Institute (SARI) of the Chinese Academy of Sciences (CAS), VTT Technical Research Centre of Finland and University of Windsor (Canada) creatively proposed a novel spectrum sensing technique for 6g-oriented intelligent IoT communications, seeking a feasible way to provide the underlying support for perceptual interference and intelligent identification between large-scale coexistence and aliasing IoT users in future 6G scenario.The research results were published in the latest issue of IEEE Internet of Things Journal.Focused on inter-system orthogonal/non-orthogonal aliasing coexistence scenarios, researchers design a multi-layer spectrum sensing technology based on feature detection in NOMA scenarios with multi-users. The corresponding rational workflows and transceiver structures according to different scenarios are presented, and the threshold expressions are deduced accordingly. Oriented towards the upcoming 6G complicated scenarios, researchers designed one downlink mode and two uplink modes to describe relationships among users’ priorities, power, and transmission forms. Based on the characteristics of each mode, researchers further customized the detection probability optimization algorithm according to the characteristics of each scene, so that the proposed technology can effectively improve the detection probability of orthogonal/non-orthogonal hybrid IoT systems and improve the overall system throughput.Experimental results verify that the proposed spectrum sensing technology is feasible and has prominent detection performance and satisfying throughput performance. This work will promote the theory of signal perception and recognition for 6G-oriented intelligent IoT communications, and will provide technical support and development potentials for the promotion of global 6G strategy.
  Figure 1. Schematic diagram of downlink hybrid IoT sensing scene and an illustration for frequency band occupancy status (Image by SARI)
  Figure 2. Schematic diagram of uplink hybrid IoT sensing scene and an illustration for frequency band occupancy status (Image by SARI)
  

2022-09-27 more+

Researchers Proposed a Facile Tactic to Enhance Electrocatalytic Conversion of Carbon Dioxide

A research team from the Shanghai Advanced Research Institute (SARI) of the Chinese Academy of Sciences reported a facile tactic that enables exceedingly efficient CO2 electroreduction to CO by virtue of low-coordination chloride ion (Cl-) adsorption on a silver hollow fiber (Ag HF) electrode.


  The electrochemical conversion of CO2 into carbon-based fuels and valuable feedstocks by renewable electricity is an attractive strategy for carbon neutrality. CO is the key component of syngas, a mixture of CO and H2 that can be directly converted into various value-added chemicals via well-developed industrial processes such as Fischer-Tropsch synthesis, methanol synthesis, etc. Therefore, CO2 electroreduction to CO is considered to be one of the most promising routes to obtain cost-competitive products.
  However, due to the low solubility and diffusion coefficient of CO2 in aqueous electrolytes, it remains a challenge to possess a large current density, a high faradaic efficiency and excellent stability for practical applications of CO2 utilization.
  Motivated by such a challenge, a research team led by Profs. CHEN Wei and WEI Wei from the Shanghai Advanced Research Institute (SARI) of the Chinese Academy of Sciences reported a facile tactic that enables exceedingly efficient CO2 electroreduction to CO by virtue of low-coordination chloride ion (Cl-) adsorption on a silver hollow fiber (Ag HF) electrode.
  The results were published in Angew. Chem. Int. Ed. on September 3.
  On the basis of the high efficient electroreduction CO2 to CO over silver hollow fiber (Ag HF) electrode, the research team further introduced chloride ions into the electrode solution, by means of specific adsorption of chloride ions, the electronic structure of the electrode surface was functionally regulated to inhibit the side reaction of hydrogen evolution (HER).
  The low-coordination chloride ion (Cl-) adsorption on a silver hollow fiber (Ag HF) electrode reduces CO2 to CO at a stable (>150 h) ampere-level current densities (1 A·cm-2) with a high CO faradaic efficiencies (>92%). 
  Electrochemical experiments, operando Raman combined with density functional theory (DFT) calculations demonstrated that the high concentration Cl- in the electrolyte could be low-coordination adsorbed onto the surface of Ag HF, which not only hinders the occurrence of the HER, but also optimizes the kinetics of CO2 reduction to CO, leading to a better eCO2RR performance, even at the ampere-level current density.
  This work provides a new strategy for further developing electrocatalytic CO2 systems with high current density, high selectivity and high stability in CO2utilization and chlor-alkali industry.
  Schematic diagram and electrocatalytic performance of efficient CO2 reduction over silver hollow fiber electrode with chloride ion adsorption (Image by SARI)
  

2022-09-09 more+

The Big Data Science Center at the Shanghai Synchrotron Radiation Facility: The Dawn of the Scientific Superfacilities

The Big Data Science Center (BDSC) at the Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences, Zhangjiang Laboratory, is the first scientific superfacility in China, and one of the first worldwide. With its state-of-the-art developments it aims to dramatically accelerate and automate the multidisciplinary research of all the users at large national scientific facilities, thus effectively increasing the rate of their scientific discoveries and the resulting technological advancements, with a clear societal impact.


   Users at the Shanghai Synchrotron Radiation Facility (SSRF) can seamlessly access the scientific and technological architecture of the Big Data Science Center (BDSC) through thin terminals to take full advantage of all the services offered by the BDSC in real time while running their experiments at the SSRF beamlines.
  The massive amount of raw data produced nowadays at large scientific facilities creates not only enormous new opportunities but also tremendous challenges. Already, only a small fraction of this multidisciplinary and scientifically complex Big Data are fully analysed and, ultimately, used in scientific publications, and it is predicted that in a few years, conventional data-analysis approaches will be overwhelmed, preventing the users from producing meaningful science from their large-scale experiments.
  This is a problem for all synchrotron and neutron facilities, as well as for X-ray free-electron laser facilities, where tens of petabytes are produced annually. Beamtime is expensive and the lack of automated data-analysis pipelines reduces beamtime efficiency. This “data deluge” effect [1] has implications for all large scientific facilities worldwide in that it affects fast data collection and storage and curation of the data, including data movement and deposition in a database.
  We are witnessing the dawn of artificial intelligence (AI), machine learning (ML) and robotic automation within the field of large scientific facilities, generating profound changes in how petabytes of interdisciplinary datasets are intelligently processed, managed, analysed and visualised. The consequent evolution of large scientific facilities into superfacilities enables multimodal user science to confront the Big Data challenges, fundamental for the entire scientific community.
  The Big Data Science Center (BDSC) at the Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences, Zhangjiang Laboratory, is the first scientific superfacility in China, and one of the first worldwide [2]. With its state-of-the-art developments it aims to dramatically accelerate and automate the multidisciplinary research of all the users at large national scientific facilities, thus effectively increasing the rate of their scientific discoveries and the resulting technological advancements, with a clear societal impact. Therefore, the BDSC Big Data Science platform targets the research projects that several national and international universities, academies, research institutes and industries are pursuing at SSRF, where massive support in terms of scientific computation is required to enable the most complete knowledge transfer from scientific research to industrial developments, while elastically interfacing them with the top Chinese National Supercomputer Centers. [video:BDSC - IUCr - LowRes]
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  Video documentary showing the BDSC activities, international potential and impact on the user’s science at the SSRF, and more in general on the large national scientific facilities worldwide. Here, the BDSC state-of-the-art superfacility capabilities are demonstrated using the Biological Macromolecular Crystallography Beamline (MX Beamline) as a case study, including users performing a real experiment in real time. The entire BDSC workflow is shown, from the preparation of the user experiment at the beamline, through the setting-up of the beamline, to the real-time Big Data analysis and results visualisation, including the user’s data being processed and monitored through the BDSC superclusters and Control Room, as well as the users interacting with the BDSC Platform.
  The BDSC is one of the latest SSRF upgrades resulting from the SSRF Phase II project. The BDSC aims to support all the SSRF beamlines, as well as their national and international users, through its state-of-the-art scientific computational infrastructure, including high-performance computing (HPC), latest-generation storage systems and advanced software platforms. Users and beamlines at the SSRF are thus benefiting, seamlessly, from the most advanced Big Data processing, movement, analysis, results interpretation and visualisation capabilities offered by the BDSC. The BDSC aims, in fact, to support all the SSRF users to produce high-impact science and technology, matching the highest international quality standards, thus further enabling the users to publish their results in top-notch internationally renowned peer-reviewed journals.
  Professor Alessandro Sepe, Director of the BDSC, has designed and architected this novel Big Data Science platform at SSRF, which allows all its users to fully exploit the scientific and technological potential of the BDSC for their research. The entire BDSC staff supported Professor Sepe’s efforts in developing, deploying and then constantly upgrading the BDSC infrastructure, which is now fully operational. Here, state-of-the-art Big Data science and technologies, AI, internet of things (IoT), real-time unstaffed and remotely controlled experiments, robotic automation, HPC, cloud/fog supercomputing and massive parallelisation are converging on the SSRF through the BDSC’s fully centralised platform, accelerating the user multidisciplinary science performed at SSRF by an outstanding factor of 60, and effectively creating the first-ever world-class user-friendly Chinese superfacility. This is greatly augmenting the interpretation of all the scientific data generated by all the experiments at SSRF. By developing, deploying and upgrading the Big Data Science platform, the BDSC is fostering full robotic automation at the SSRF beamlines, aiming at real-time unstaffed and remotely controlled experiments, while sharing its successful experience with all the other multidisciplinary large facilities worldwide.
  The Big Data Science platform developed by the BDSC is, in fact, collecting, tagging and tracking large volumes of metadata from all the experiments at SSRF to fully automate the entire large-facility lifecycle. Hundreds of petabytes of scientific data are thus tagged, to be then ingested by neural networks for ML. This remarkable scientific and technological achievement also allows non-expert users at SSRF to obtain scientifically meaningful results in real time, instead of spending months, after returning to their home institutions, processing unstructured raw data. The BDSC is thus effectively extending the use of large national facilities to the largest number of scientific and industrial disciplines ever, dramatically increasing the scientific and technological productivity of large scientific facilities like SSRF, shifting the focus of their users from data science to pure science, thus enabling a true user-science-centric and multimodal infrastructure.
  The BDSC is also engaged in further expanding the SSRF scientific computational capabilities, directly interfacing, through the BDSC framework, the SSRF with the supercomputers in China, including the Shanghai Supercomputer Center (SSC), with extremely low-latency networks.
  The BDSC further aims at seeding the Chinese National Scientific Grid based on the platform model being developed at the BDSC.
  References:
  [1] C. Wang, U. Steiner & A. Sepe (2018). Synchrotron Big Data Science. Small, 14, 1802291.
  [2] C. Wang, F. Yu, Y. Liu, X. Li, J. Chen, J. Thiyagalingam & A. Sepe (2021). Deploying the Big Data Science Center at the Shanghai Synchrotron Radiation Facility: the first superfacility platform in China. Mach. Learn.: Sci. Technol. 2, 035003.
   
  Source: International Union of Crystallography (IUCr)
  

2022-09-07 more+

Novel Approach to Fabricating Gadolinium Oxide Structure Neutron Absorber by 3D Printing

A research team at Shanghai Advanced Research Institute proposed a new approach to fabricating the Gd2O3 structure by vat photopolymerization 3D printing.The research results were published in Ceramics International.

The exceptional proprieties of gadolinium oxide (Gd2O3) enable wide applications as sensitized fluorescent material, optical additive, and especially neutron absorber material for nuclear industry or nuclear medicine. However, due to high melting point (2350 °C) and hardness, it is very difficult to manufacture the custom-designed Gd2O3 with traditional milling, curving, injection molding and the binder sacrifice method.Motivated by such a challenge, a research team at Shanghai Advanced Research Institute proposed a new approach to fabricating the Gd2O3 structure by vat photopolymerization 3D printing.The research results were published in Ceramics International.For successful 3D printing, researchers investigated thoughtfully the whole manufacturing process, including the slurry preparation, photocuring parameters, sintering temperature, and mechanical properties of sintered samples.After debinding and sintering, the resultant Gd2O3 structures reached a density of 58%, a bending stress of 40 MPa, and a flexural elastic modulus of and 20.219 GPa, revealing the influence of sintering temperature on the relative density, micro structure and flexural elastic modulus.Finally, a green body with a large size of 10 cm was prepared, shedding light on its practical application in the neutron absorption and shielding.This work provides a novel strategy to precisely prepare the pure Gd2O3 ceramic with structural flexibility. The developed DLP 3D printing method provides an effective route to meet the personalized needs of Gd2O3 structure in the neutron absorption and shielding.
  Schematic illustration of DLP 3D-printing of Gd2O3 structure neuron absorber
  (Image by SARI)
  

2022-08-29 more+