用于增强苯燃烧催化性能的金/氧化铈的铌改性

Niobium Modification of Au/CeO for Enhanced Catalytic Performance over Benzene Combustion.

作者信息

Liu Zhe, Zhang Xiaolan, Cai Ting, Yuan Jing, Zhao Kunfeng, Lu Wenquan, He Dannong

机构信息

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

National Engineering Research Center for Nanotechnology, Shanghai 200241, China.

出版信息

Nanomaterials (Basel). 2021 Jan 13;11(1):189. doi: 10.3390/nano11010189.

DOI:10.3390/nano11010189

PMID:33451121

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7828588/

Abstract

A novel Au/Nb-CeO was obtained by loading Au to Nb-modified CeO adopting a thermal decomposition method. The modification effect of Nb on the physicochemical properties and performance of Au/CeO for benzene combustion was systematically clarified. The incorporated Nb species are found to be present in the two forms of highly-dispersed state and bulk NbO into CeO lattice in the obtained Au/Nb-CeO catalyst. They greatly enlarged the BET surface area, improved the redox property, and strengthened the Au-support interaction. The addition of Nb also promotes catalytic performance of Au/CeO, especially high-temperature performance: decreases by ca. 40 °C and Au/Nb-CeO exhibits superior stability to Au/CeO at 230 °C. The slightly improved Au dispersion and redox properties resulted in the small increase on initial activity of Au/Nb-CeO, but the large BET surface area and the strong Au-support interaction greatly promoted the high-temperature performance improvement of Au/Nb-CeO for benzene combustion reaction.

摘要

采用热分解法将金负载到铌改性的二氧化铈上，制备了一种新型的金/铌-二氧化铈催化剂。系统地阐明了铌对金/二氧化铈催化剂的物理化学性质及苯燃烧性能的改性作用。在所制备的金/铌-二氧化铈催化剂中，掺入的铌物种以高度分散状态和体相氧化铌两种形式存在于二氧化铈晶格中。它们极大地增大了比表面积，改善了氧化还原性能，并增强了金与载体之间的相互作用。铌的添加还提高了金/二氧化铈的催化性能，尤其是高温性能：起燃温度降低了约40℃，并且在230℃时金/铌-二氧化铈比金/二氧化铈表现出更好的稳定性。金分散度和氧化还原性能的轻微改善导致金/铌-二氧化铈的初始活性略有增加，但较大的比表面积和较强的金与载体之间的相互作用极大地促进了金/铌-二氧化铈在苯燃烧反应中的高温性能提升。