A5046772439- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Advanced Photocatalysis Techniques
- Ammonia Synthesis and Nitrogen Reduction
- Semiconductor materials and devices
- Atmospheric chemistry and aerosols
- Nanomaterials for catalytic reactions
- Iron oxide chemistry and applications
- Arsenic contamination and mitigation
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Chemical Physics Studies
- Catalysis and Hydrodesulfurization Studies
- Gas Sensing Nanomaterials and Sensors
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Electrocatalysts for Energy Conversion
- Atmospheric Ozone and Climate
- Ferroelectric and Negative Capacitance Devices
- Spectroscopy and Laser Applications
- Electronic and Structural Properties of Oxides
- Advancements in Semiconductor Devices and Circuit Design
- Per- and polyfluoroalkyl substances research
- Air Quality and Health Impacts
- Electrochemical Analysis and Applications
- Membrane Separation and Gas Transport
State Key Joint Laboratory of Environment Simulation and Pollution Control
2016-2025
Chinese Academy of Sciences
2016-2025
Research Center for Eco-Environmental Sciences
2016-2025
University of Chinese Academy of Sciences
2017-2025
University of Oxford
2023
China Institute of Atomic Energy
2016-2022
Jingdong (China)
2022
Beijing Administration Institute
2016-2022
Wuhan Textile University
2021
Institute of High Energy Physics
2019
Transition metal (cerium and cobalt) doped γ-MnO2 (M-γ-MnO2, where M represents Ce, Co) catalysts were successfully synthesized characterized. Cerium-doped materials showed ozone (O3) conversion of 96% for 40 ppm O3 under relative humidity (RH) 65% space velocity 840 L g–1 h–1 after 6 h at room temperature, which is far superior to the performance Co-γ-MnO2 (55%) (38%) catalysts. Under h–1, over Ce-γ-MnO2 catalyst RH = dry conditions within 96 was 60% 100%, respectively, indicating that it a...
The structure of dispersed vanadyl species plays a crucial role in the selective catalytic reduction (SCR) NO with NH3 over vanadia-based catalysts. Here, we demonstrate that polymeric have markedly higher NH3-SCR activity than monomeric species. coupling effect not only shortens reaction pathway for regeneration redox sites but also substantially reduces overall barrier cycle. Therefore, it is species, rather determine catalysts, especially under low-temperature conditions. SCR mechanism...
The electrocatalytic reduction of CO2 (CO2ER) to liquid fuels is important for solving fossil fuel depletion. However, insufficient insight into the reaction mechanisms renders a lack effective regulation product selectivity. Here, in situ surface-enhanced Raman spectroscopy (SERS) empowered by 13C/12C isotope exchange applied probing CO2ER process on nanoporous silver (np-Ag). Direct spectroscopic evidence preliminary intermediates, *COOH and *OCO-, indicates that coordinated catalyst via...
Ammonia (NH3) has potentially harmful effects on human health and recently been found to be an important factor in the formation of haze; thus, its emission control is urgent, especially during haze pollution periods. In this work, two kinds Ag/Al2O3 catalysts with different Al2O3 particle sizes (micro-Al2O3 nano-Al2O3) were prepared tested for selective catalytic oxidation ammonia (NH3-SCO). It was shown that Ag/nano-Al2O3 much more active than Ag/micro-Al2O3 NH3-SCO low-temperature range....
Mn-based oxides exhibit outstanding low-temperature activity for the selective catalytic reduction of NOx with NH3 (NH3-SCR) compared other catalysts. However, underlying principle responsible excellent is not yet clear. Here, atomic-level mechanism and activity-limiting factor in NH3-SCR process over Mn-, Fe-, Ce-based oxide catalysts are elucidated by a combination first-principles calculations experimental measurements. We found that superior oxidative dehydrogenation performance toward...
We report an unrecognized but efficient nonradical mechanism in biochar-activated peroxydisulfate (PDS) systems. Combining a newly developed fluorescence trapper of reactive oxygen species with steady-state concentration calculations, we showed that raising pyrolysis temperatures biochar (BC) from 400 to 800 °C remarkably enhanced trichlorophenol degradation inhibited the catalytic production radicals (SO4•– and •OH) water soil, thereby switching radical-based activation into...
Commercial Cu-exchanged small-pore SSZ-13 (Cu-SSZ-13) zeolite catalysts are highly active for the standard selective catalytic reduction (SCR) of NO with NH
Pt/Al2O3 catalysts showing excellent activity and stability have been used in various reactions, including HCHO oxidation. Herein, we prepared Pt–Na/Al2O3 with a Pt content of 0.05 wt % to reveal the key factors determining anchoring as well catalytic mechanism Pt–Na/nano-Al2O3 (denoted Pt–Na/nAl2O3) could completely oxidize CO2 at room temperature, which is lowest oxidation our knowledge. After Na addition, terminal hydroxyl groups HO-μter) on nano-Al2O3 were transformed doubly bridging...
CeO2 has attracted much attention in the field of selective catalytic reduction NO with NH3 (NH3-SCR). However, poor low-temperature activity and a narrow operation window restrict industrial application Ce-based oxide catalysts. Herein, NH3-SCR catalysts was dramatically improved by Mn doping, mechanism elucidated at atomic level experimental measurements density functional theory calculations. We found that addition significantly promoted formation surface oxygen vacancies. The vacancies...
State-of-the-art ion-selective membranes with ultrahigh precision are of significance for water desalination and energy conservation, but their development is limited by the lack understanding mechanisms ion transport at subnanometer scale. Herein, we investigate three typical anions (F − , Cl Br ) under confinement using in situ liquid time-of-flight secondary mass spectrometry combination transition-state theory. The operando analysis reveals that dehydration related ion-pore interactions...
The formation of dimer-Cu species, which serve as the active sites low-temperature selective catalytic reduction NO
Twice the amount of ˙OH as that reacted H<sub>2</sub>O<sub>2</sub> is produced <italic>via</italic> two electron transfer processes from electron-rich Cu centers to and H<sub>2</sub>O N atom OH–CCN/CuCo–Al<sub>2</sub>O<sub>3</sub> composite, which results in extremely high activity for pollutant degradation with a utilization efficiency H<sub>2</sub>O<sub>2</sub>.
Formaldehyde (HCHO) is either a reactant, intermediate, or product in numerous industrial catalytic reactions; therefore, revealing the full transformation process of HCHO during heterogeneous catalysis prime importance understanding mechanisms many HCHO-related reactions and designing more efficient catalysts. As two main intermediates transformation, conversion dioxymethylene (DOM) to formate one key steps. There are three recognized pathways for this step, including direct dissociation...
The Ag/Al2O3 catalyst possesses high activity for selective catalytic oxidation of ammonia (NH3–SCO), and its could be significantly improved by H2 pretreatment. It is generally accepted that the enhancement after reduction due to promoted O2 activation metallic Ag species. Here, we show recovery Brønsted acid sites via also an important factor. H2-pretreated (Ag/Al2O3–H2) catalysts were prepared tested NH3–SCO performances, carefully characterized. revealed species anchored on Al2O3 surface...
Vanadia-based catalysts have been widely used for catalyzing various reactions, including their long-standing application in the deNOx process. It has commonly considered that vanadium species dispersed on supports with a large surface area act as catalytically active sites. However, role of crystalline V2O5 selective catalytic reduction NOx NH3 (NH3-SCR) remains unclear. In this study, catalyst low vanadia loading was synthesized, which deposited TiO2 support had pretreated at high...
Fe
Abstract Nitrous acid (HONO) is the major precursor of hydroxyl (OH) radicals to initiate tropospheric chemistry leading formation secondary pollutants. The sources atmospheric HONO, however, are not fully understood. Here we show two additional HONO that stem from oxidation nitrogen oxide (NO x = NO + 2 ). Nitric (HNO 3 ) formed photooxidation can be converted into with a yield ~53%, and dark by in presence H O produces 2%. diurnal variations levels field observations urban (Beijing) rural...
Electrocatalytic hydrogenation is acknowledged as a promising strategy for chlorophenol dechlorination. However, the widely used Pd catalysts exhibit drawbacks, such high costs and low selectivity phenol hydrosaturation. Herein, we demonstrate potential mechanism of Ru in serving substitute using 2,4,6-trichlorophenol (TCP) model pollutant. Up to 99.8% TCP removal efficiency 99% cyclohexanol, value-added compound with an extremely toxicity, were achieved on electrode. In contrast, only 66%...
Surface hydroxyl groups commonly exist on the catalyst and present a significant role in catalytic reaction. Considering lack of systematical researches effect surface group reactant molecule activation, PtOx/TiO2 PtOx–y(OH)y/TiO2 catalysts were constructed studied for comprehensive understanding roles oxidation volatiles organic compounds. The formed by simple treatment with nitric acid presented greatly enhanced activity toluene which turnover frequency was around 14 times as high that...
Catalytic decomposition is a promising method for N2O removal, and the nature of active sites on catalysts under debate. The combination experimental observations density functional theory (DFT) calculations indicates that oxygen vacancies in metal oxide serve as decomposition. Co doping CeO2 significantly increases content vacancies, thereby enhancing activity catalyst A with Co/Ce = 1 exhibited best activity, T90 375 °C excellent stability maintained over 100 h, which much better than...
Back-streaming neutrons through the incoming proton channel at spallation target station of China Spallation Neutron Source (CSNS) has been exploited as a white neutron beam line (so-called Back-n), and number spectrometers for nuclear data measurements have planned. With thick tungsten modest moderation by cooling water slices, is very intense which in order 5.0×106 n/cm2/s 80 m from an excellent energy spectrum spanning 1 eV to 100 MeV. In addition, time structure primary under different...