文献类型：期刊文献

中文题名：Revealing the anti-sintering phenomenon on silica-supported nickel catalysts during CO_(2)hydrogenation

作者：Liuqingqing Yang[1,2];Tiancheng Pu[1];Feixiang Tian[2];Yulian He[2,3];Minghui Zhu[1]

机构：[1]State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;[2]University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University,Shanghai 200240,China;[3]School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

年份：2024

期号：6

起止页码：270

中文期刊名：Journal of Environmental Sciences

外文期刊名：环境科学学报（英文版）

收录：CSTPCD;;CSCD:【CSCD2023_2024】；PubMed;

基金：supported by the Shanghai Post-Doctoral Excellence Program(No.2021232);Y.He thanks the National Natural Science Foundation of China(No.22202131);the Shanghai Science and Technology Development Funds of“Rising Star”Sailing Program(No.22YF1419400)for the financial support;M.Zhu thanks the research funding sponsored by the National Natural Science Foundation of China(No.22078089);the Shanghai Special Program for Fundamental Research(No.22TQ1400100-7);the Basic Research Program of Science and Technology Commission of Shanghai Municipality(No.22JC1400600)。

语种：英文

中文关键词：Carbon dioxide utilization;CO_(2)hydrogenation;Nickel-based catalysts;Anti-sintering;Structural evolution

摘要：The CO_(2)catalytic hydrogenation represents a promising approach for gas-phase CO_(2)utilization in a direct manner.Due to its excellent hydrogenation ability,nickel has been widely studied and has shown good activities in CO_(2)hydrogenation reactions,in addition to its high availability and low price.However,Ni-based catalysts are prone to sintering under elevated temperatures,leading to unstable catalytic performance.In the present study,various characterization techniques were employed to study the structural evolution of Ni/SiO_(2)during CO_(2)hydrogenation.An anti-sintering phenomenon is observed for both 9%Ni/SiO_(2)and 1%Ni/SiO_(2)during CO_(2)hydrogenation at 400℃.Results revealed that Ni species were re-dispersed into smaller-sized nanoparticles and formed Ni^(0)active species.While interestingly,this anti-sintering phenomenon leads to distinct outcomes for two catalysts,with a gradual increase in both reactivity and CH_(4)selectivity for 9%Ni/SiO_(2)presumably due to the formation of abundant surface Ni°from redispersion,while an apparent decreasing trend of CH_(4)selectivity for 1%Ni/SiO_(2)sample,presumably due to the formation of ultra-small nanoparticles that diffuse and partially filled the mesoporous pores of the silica support over time.Finally,the redispersion phenomenon was found relevant to the H_(2)gas in the reaction environment and enhanced as the H_(2)concentration increased.This finding is believed to provide in-depth insights into the structural evolution of Ni-based catalysts and product selectivity control in CO_(2)hydrogenation reactions.