High Temperature Water Gas Shift Reactivity of Novel Perovskite Catalysts

Catalysts

Andreas Nenning¹  AlexanderKarl Opitz¹  Christoph Rameshan²  Thomas Ruh²  Lorenz Lindenthal²  Raffael Rameshan²  Janko Popovic²  Stefan Löffler³ 

[1] TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC, 1060 Vienna, Austria;TU Wien, Institute of Materials Chemistry, Getreidemarkt 9/165-PC, 1060 Vienna, Austria;TU Wien, USTEM, Wiedner Hauptstr. 8-10/E057-02, 1040 Vienna, Austria;

关键词: water gas shift;    perovskites;    exsolution;    nanoparticles;    doping;    catalyst design;   

DOI  :  10.3390/catal10050582

来源: DOAJ

【 摘 要 】

High temperature water-gas shift (HT-WGS) is an industrially highly relevant reaction. Moreover, climate change and the resulting necessary search for sustainable energy sources are making WGS and reverse-WGS catalytic key reactions for synthetic fuel production. Hence, extensive research has been done to develop improved or novel catalysts. An extremely promising material class for novel highly active HT-WGS catalysts with superior thermal stability are perovskite-type oxides. With their large compositional flexibility, they enable new options for rational catalyst design. Particularly, both cation sites (A and B in ABO₃) can be doped with promoters or catalytically active elements. Additionally, B-site dopants are able to migrate to the surface under reducing conditions (a process called exsolution), forming catalytically active nanoparticles and creating an interface that can strongly boost catalytic performance. In this study, we varied A-site composition and B-site doping (Ni, Co), thus comparing six novel perovskites and testing them for their HT-WGS activity: La_0.9Ca_0.1FeO_3-δ, La_0.6Ca_0.4FeO_3-δ, Nd_0.9Ca_0.1FeO_3-δ, Nd_0.6Ca_0.4FeO_3-δ, Nd_0.6Ca_0.4Fe_0.9Ni_0.1O_3-δ and Nd_0.6Ca_0.4Fe_0.9Co_0.1O_3-δ. Cobalt and Nickel doping resulted in the highest activity observed in our study, highlighting that doped perovskites are promising novel HT-WGS catalysts. The effect of the compositional variations is discussed considering the kinetics of the two partial reactions of WGS-CO oxidation and water splitting.

【 授权许可】

Unknown