Ru surface density effect on ammonia synthesis activity and hydrogen poisoning of ceria-supported Ru catalysts

作     者：Bingyu Lin Yuyuan Wu Biyun Fang Chunyan Li Jun Ni Xiuyun Wang Jianxin Lin Lilong Jiang 林炳裕;吴玉远;方笔耘;李春艳;倪军;王秀云;林建新;江莉龙

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

基　　金：国家自然科学基金(21776047,21825801,21978051) 2018年度福建省高校杰出青年科研人才培育计划 福州大学旗山学者奖励支持计划(XRC-18033) 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2021年第42卷第10期

页      码：1712-1723页

摘      要：Evaluating the effect of metal surface density on catalytic performance is critical for designing high-activity metal-based *** this study,a series of ceria(CeCO_(2))-supported Ru catalysts(Ru/CeCO_(2))were prepared to analyze the effect of Ru surface density on the catalytic performance of Ru/CeCO_(2) for ammonia *** the Ru/CeCO_(2) catalysts with Ru surface densities lower than 0.68 Ru nm^(-2),the Ru layers were in close contact with CeCO_(2),and electrons were transferred directly from the CeCO_(2) defect sites to the Ru *** such cases,the adsorption of hydrogen species on the Ru sites in the vicinity of 0 atoms was high,leading to a high ammonia synthesis activity and strong hydrogen *** contrast,the preferential aggregation of Ru species into large particles on top of the Ru overlayer resulted in the coexistence of Ru clusters and particles,for catalysts with a Ru surface density higher than 1.4 Ru nm^(-2),for which Ru particles were isolated from the direct electronic influence of CeCO_(2).Consequently,the Ru-Ceth interactions were weak,and hydrogen poisoning can be significantly ***,electron transfer and hydrogen adsorption synergistically affected the synthesis of ammonia over Ru/CeCO_(2) catalysts,and catalyst samples with a Ru surface density lower than 0.31 Ru nm^(-2) or exactly 2.1 Ru nm^(-2) exhibited high catalytic activity for ammonia synthesis.

主 题 词：Ammonia synthesis Ceria-supported Ru catalyst Ru surface density Hydrogen adsorption Hydrogen poisoning 

学科分类：081702[081702] 081705[081705] 08[工学] 0817[工学-轻工类] 080502[080502] 0805[工学-能源动力学] 

核心收录：

D　O　I：10.1016/S1872-2067(20)63787-1

馆 藏 号：203103675...