双金属片
催化作用
费托法
材料科学
锌
金属
分解
碳化物
钴
热分解
水煤气变换反应
纳米颗粒
化学工程
无机化学
化学
冶金
选择性
纳米技术
有机化学
工程类
作者
Shengkun Liu,Qiao Zhao,X. Han,Chongyang Wei,Haoting Liang,Yidan Wang,Shouying Huang,Xinbin Ma
标识
DOI:10.1007/s12209-023-00360-3
摘要
Abstract The interaction between a promoter and an active metal crucially impacts catalytic performance. Nowadays, the influence of promoter contents and species has been intensively considered. In this study, we investigate the effect of the iron (Fe)–zinc (Zn) proximity of Fe–Zn bimetallic catalysts on CO 2 hydrogenation performance. To eliminate the size effect, Fe 2 O 3 and ZnO nanoparticles with uniform size are first prepared by the thermal decomposition method. By changing the loading sequence or mixing method, a series of Fe–Zn bimetallic catalysts with different Fe–Zn distances are obtained. Combined with a series of characterization techniques and catalytic performances, Fe–Zn bimetallic proximity for compositions of Fe species is discussed. Furthermore, we observe that a smaller Fe–Zn distance inhibits the reduction and carburization of the Fe species and facilitates the oxidation of carbides. Appropriate proximity of Fe and Zn (i.e., Fe 1 Zn 1 -imp and Fe 1 Zn 1 -mix samples) results in a suitable ratio of the Fe 5 C 2 and Fe 3 O 4 phases, simultaneously promoting the reverse water–gas shift and Fischer–Tropsch synthesis reactions. This study provides insight into the proximity effect of bimetallic catalysts on CO 2 hydrogenation performance. Graphical Abstract
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