Improving the ammonia synthesis activity of Ru/CeO_(2) through enhancement of the metal–support interaction

作     者：Chunyan Li Yuying Shi Zecheng Zhang Jun Ni Xiuyun Wang Jianxin Lin Bingyu Lin Lilong Jiang Chunyan Li;Yuying Shi;Zecheng Zhang;Jun Ni;Xiuyun Wang;Jianxin Lin;Bingyu Lin;Lilong Jiang

作者机构：National Engineering Research Center of Chemical Fertilizer CatalystCollege of Chemical EngineeringFuzhou UniversityFuzhou 350002FujianChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第9期

页      面：403-409页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Science Foundation of China (Nos. 21776047, 21825801, 21978051) the Program for Qishan Scholar of Fuzhou University (Grant XRC18033) 

主　　题：Ammonia synthesis Na BH4treatment Metal–support interaction Ru/CeO_(2) 

摘      要：The metal–support interactions induced by high-temperature hydrogen reduction have a strong influence on the catalytic performance of ceria-supported Ru catalysts. However, the appearance of the strong metal–support interaction leads to covering of the Ru species by Ce suboxides, which is detrimental to the ammonia synthesis reaction that requires metallic species as active sites. In the present work, the interaction between Ru and ceria in the Ru/CeO_(2) catalyst was induced by NaBH_(4) treatment. NaBH_(4) treatment enhanced the fraction of metallic Ru, proportion of Ce^(3+), content of exposed Ru species, and amount of surface oxygen species. As a result, a larger amount of hydrogen species would desorb by the H_(2)-formation pathway and the strength of hydrogen adsorption would be weaker, weakening the inhibition effect of the hydrogen species on ammonia synthesis. In addition, the strong electronic metal–support interaction aids in nitrogen dissociation. Consequently, Ru/CeO_(2) with NaBH_(4) treatment showed higher ammonia synthesis rates than that with only hydrogen reduction.