Tracking dynamic evolution of catalytic active sites in photocatalytic CO2 reduction by in situ time-resolved spectroscopy

Rare Metals ◽  
2020 ◽  
Vol 39 (6) ◽  
pp. 607-609 ◽  
Author(s):  
Guo-Zhu Chen ◽  
Ke-Jun Chen ◽  
Jun-Wei Fu ◽  
Min Liu
Keyword(s):  
Active Sites ◽  
Co2 Reduction ◽  
Dynamic Evolution ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Catalytic Active Sites

Dependence of the intrinsic phase structure of Bi2O3 catalysts on photocatalytic CO2 reduction

2021 ◽  
Vol 11 (6) ◽  
pp. 2021-2025
Author(s):  
Liujin Wei ◽  
Guan Huang ◽  
Yajun Zhang
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Phase Structure ◽  
Co2 Reduction ◽  
Fourier Transform Infrared ◽  
Time Resolved ◽  
Dependent Activity

The combination of time-resolved transient photoluminescence with in-situ Fourier transform infrared spectroscopy has been conducted to investigate the intrinsic phase structure-dependent activity of Bi2O3 catalyst for CO2 reduction.

In Situ-Grown Island-Shaped Hollow Graphene on TaON with Spatially Separated Active Sites Achieving Enhanced Visible-Light CO2 Reduction

ACS Catalysis ◽  
2020 ◽  
Vol 10 (24) ◽  
pp. 15083-15091
Author(s):  
Lang Pei ◽  
Yongjun Yuan ◽  
Wangfeng Bai ◽  
Taozhu Li ◽  
Heng Zhu ◽  
...  
Keyword(s):  
Visible Light ◽  
Active Sites ◽  
Co2 Reduction

scholarly journals Time-resolved in situ visualization of the structural response of zeolites during catalysis

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jinback Kang ◽  
Jerome Carnis ◽  
Dongjin Kim ◽  
Myungwoo Chung ◽  
Jaeseung Kim ◽  
...  
Keyword(s):  
Active Sites ◽  
Density Functional ◽  
Three Dimensional ◽  
Structural Response ◽  
Active Regions ◽  
Structural Deformation ◽  
Time Resolved ◽  
X Ray ◽  
Future Design

AbstractZeolites are three-dimensional aluminosilicates having unique properties from the size and connectivity of their sub-nanometer pores, the Si/Al ratio of the anionic framework, and the charge-balancing cations. The inhomogeneous distribution of the cations affects their catalytic performances because it influences the intra-crystalline diffusion rates of the reactants and products. However, the structural deformation regarding inhomogeneous active regions during the catalysis is not yet observed by conventional analytical tools. Here we employ in situ X-ray free electron laser-based time-resolved coherent X-ray diffraction imaging to investigate the internal deformations originating from the inhomogeneous Cu ion distributions in Cu-exchanged ZSM-5 zeolite crystals during the deoxygenation of nitrogen oxides with propene. We show that the interactions between the reactants and the active sites lead to an unusual strain distribution, confirmed by density functional theory simulations. These observations provide insights into the role of structural inhomogeneity in zeolites during catalysis and will assist the future design of zeolites for their applications.

scholarly journals In Situ Spectroscopic Methods for Electrocatalytic CO2 Reduction

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 481
Author(s):  
Lei Jin ◽  
Ali Seifitokaldani
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Active Sites ◽  
Co2 Reduction ◽  
Value Added ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Spectroscopic Methods ◽  
X Ray

Electrochemical reduction of CO2 to value-added chemicals and fuels is a promising approach to store renewable energy while closing the anthropogenic carbon cycle. Despite significant advances in developing new electrocatalysts, this system still lacks enough energy conversion efficiency to become a viable technology for industrial applications. To develop an active and selective electrocatalyst and engineer the reaction environment to achieve high energy conversion efficiency, we need to improve our knowledge of the reaction mechanism and material structure under reaction conditions. In situ spectroscopies are among the most powerful tools which enable measurements of the system under real conditions. These methods provide information about reaction intermediates and possible reaction pathways, electrocatalyst structure and active sites, as well as the effect of the reaction environment on products distribution. This review aims to highlight the utilization of in situ spectroscopic methods that enhance our understanding of the CO2 reduction reaction. Infrared, Raman, X-ray absorption, X-ray photoelectron, and mass spectroscopies are discussed here. The critical challenges associated with current state-of-the-art systems are identified and insights on emerging prospects are discussed.

scholarly journals Active sites for tandem reactions of CO2 reduction and ethane dehydrogenation

2018 ◽  
Vol 115 (33) ◽  
pp. 8278-8283 ◽  
Author(s):  
Binhang Yan ◽  
Siyu Yao ◽  
Shyam Kattel ◽  
Qiyuan Wu ◽  
Zhenhua Xie ◽  
...  
Keyword(s):  
Active Sites ◽  
Density Functional ◽  
Raw Materials ◽  
Co2 Reduction ◽  
Tandem Reactions ◽  
In Situ Characterization ◽  
Functional Theory ◽  
Ethane Dehydrogenation ◽  
Ethylene Selectivity

Ethylene (C2H4) is one of the most important raw materials for chemical industry. The tandem reactions of CO2-assisted dehydrogenation of ethane (C2H6) to ethylene creates an opportunity to effectively use the underutilized ethane from shale gas while mitigating anthropogenic CO2 emissions. Here we identify the most likely active sites over CeO2-supported NiFe catalysts by using combined in situ characterization with density-functional theory (DFT) calculations. The experimental and theoretical results reveal that the Ni–FeOx interfacial sites can selectively break the C–H bonds and preserve the C–C bond of C2H6 to produce ethylene, while the Ni–CeOx interfacial sites efficiently cleave all of the C–H and C–C bonds to produce synthesis gas. Controlled synthesis of the two distinct active sites enables rational enhancement of the ethylene selectivity for the CO2-assisted dehydrogenation of ethane.

Luminescence mechanism of Eu3+ ions doped NaYF4 nanocrystals via in situ time-resolved spectroscopy

2020 ◽  
Vol 46 (8) ◽  
pp. 11132-11136
Author(s):  
Qingyan Han ◽  
Aihua Hao ◽  
Wei Gao ◽  
Jianxia Qi ◽  
Yongkai Wang ◽  
...  
Keyword(s):  
Time Resolved ◽  
Time Resolved Spectroscopy
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