Enriching the surface oxygen as efficient anchoring site of highly dispersed Ru for enhanced hydrogenolysis activity  

作　　者：Hongfei Xiao Jianghao Zhang Chuo Du Yanxia Zheng Shuchao Ge Jinhou Fang Shuang Li Changbin Zhang 

机构地区：[1]State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Chemical Engineering,Northwest University,Xi’an 710069,China [4]Weifang Research Institute of Materials and Technology for Eco-environmental Protection,Weifang 261300,China

出　　处：《Nano Research》2023年第10期12331-12337,共7页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.22025604,21976196,21936005,and 21878244);the fellowship of China Postdoctoral Science Foundation(No.2022M713308);the Special Project of Eco-environmental Technology for Emission Peak&Carbon Neutralization(No.RCEES-TDZ-2021-4).

摘　　要：While supported-noble-metal catalysts have been widely investigated in hydrotreating reactions,a crucial issue that the catalytic system is still confronted with is developing an efficient approach to gain the high dispersion of noble metals under reducing conditions.In this work,Ru was supported on two MnOx with different specific surface areas(SSAs),and a much higher dispersion of Ru(83%,in contrast to 42%of the other one)was surprisingly observed over MnO with much lower SSA(around one-third of the other one).A suite of complementary characterizations demonstrates that,compared with the catalyst with high SSA(Ru/MnO-H),the MnO in the one with lower SSA(Ru/MnO-L)contains enriched surface oxygen that creates more abundant sites and bears stronger strength to anchor Ru species,mitigating the aggregation of Ru under reducing condition.This not only enriched active sites(i.e.,exposed Ru),but also created a more electron-deficient Ru domain and thus enhanced the redox property of the surface,leading to the lower barrier for C–O bond hydrogenolysis.In the hydrogenolysis of diphenyl ether,Ru/MnO-L exhibited significantly enhanced activity(i.e.,6 folds of Ru/MnO-H)and high stability.This work provides an approach to regulate the surface chemistry of support for the high dispersion of supported metal.

关 键 词：anchoring strength oxygen-rich support HYDROGENOLYSIS C–O bond cleavage Ru-based catalyst 

分 类 号：O64[理学—物理化学]