In-situ structural reconstruction triggers the hydrothermal synthesis of hierarchical Ti-Beta zeolites for oxidative desulfurization

2021 ◽  
Author(s):  
Haikuo Ma ◽  
Haoyi Lin ◽  
Xiuquan Liu ◽  
Hongying Lü ◽  
Zhiguo Zhu
Keyword(s):  
Hydrothermal Synthesis ◽  
Active Sites ◽  
Oxidative Desulfurization ◽  
Zeolite Crystal ◽  
Efficient Approach ◽  
Hierarchical Porosity ◽  
Beta Zeolites

Fabricating hierarchical porosity in metallosilicate zeolite crystal is a facile and efficient approach to increase the accessibility of active sites and to enhance diffusion performance in the process of catalytic...

scholarly journals Electrokinetic and in situ spectroscopic investigations of CO electrochemical reduction on copper

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jing Li ◽  
Xiaoxia Chang ◽  
Haochen Zhang ◽  
Arnav S. Malkani ◽  
Mu-jeng Cheng ◽  
...  
Keyword(s):  
Mass Transport ◽  
Active Sites ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Adsorbed Hydrogen ◽  
Diffusion Type ◽  
Proton Coupled Electron Transfer ◽  
Alkaline Electrolytes ◽  
Reaction Orders

AbstractRigorous electrokinetic results are key to understanding the reaction mechanisms in the electrochemical CO reduction reaction (CORR), however, most reported results are compromised by the CO mass transport limitation. In this work, we determined mass transport-free CORR kinetics by employing a gas-diffusion type electrode and identified dependence of catalyst surface speciation on the electrolyte pH using in-situ surface enhanced vibrational spectroscopies. Based on the measured Tafel slopes and reaction orders, we demonstrate that the formation rates of C2+ products are most likely limited by the dimerization of CO adsorbate. CH4 production is limited by the CO hydrogenation step via a proton coupled electron transfer and a chemical hydrogenation step of CO by adsorbed hydrogen atom in weakly (7 < pH < 11) and strongly (pH > 11) alkaline electrolytes, respectively. Further, CH4 and C2+ products are likely formed on distinct types of active sites.

An efficient approach to strengthen polyvinyl alcohol physical hydrogel via in situ growing NH2-decorated polysiloxane structures

2021 ◽  
Vol 290 ◽  
pp. 129505
Author(s):  
Haining Wang ◽  
Birong Tian ◽  
Fu Wang ◽  
Jinyun Zhang ◽  
Zhaofeng Wang
Keyword(s):  
Polyvinyl Alcohol ◽  
Efficient Approach
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