Impact Factor:

13.273

DOI number:

10.1016/j.cej.2019.122023

Affiliation of Author(s):

重庆工商大学

Teaching and Research Group:

材料科学与工程系

Journal:

Chemical Engineering Journal

Funded by:

重庆市科技局

Key Words:

CeCo composite catalyst；Bimodal mesoporous；Surface oxygen vacancy；Synergistic effect；CO2 catalytic hydrogenation

Abstract:

The CeO2-δ and CeCo composite catalysts with different Ce/Co mole ratio were prepared by hard-template method for CO2 catalytic hydrogenation. The physical and chemical properties of these catalysts were characterized by H2-TPR, XRD, BET, TEM, ICP, and in-situ XPS. The characterization results indicated that the Co ions can be dissolved into the CeO2 lattice to form Ce-O-Co solid solution, which promotes the reduction of corresponding precursor to form Co active species, surface oxygen vacancies, and the Ce3+-□-Co0 structure. The pore structure of the CeCo composite catalysts can be affected by the Ce/Co mole ratio, and the bimodal mesoporous structure can be obtained at relative high Ce/Co mole ratio. The synergistic effect from ordered bimodal mesoporous structure, surface oxygen vacancies, and metallic Co active species can effectively promote CO2 hydrogenation reaction. The CeCo05 composite catalyst with Ce/Co mole ratio of 0.5 exhibited superior CO2 hydrogenation catalytic activity and high stability, the CO2 catalytic hydrogenation reaction rate and CH4 selectivity reached 4.10 × 10−5 mol/gcat/s and 93.3% at 400 °C, respectively. This work indicated that the CeCo composite catalyst is a promising candidate for CO2 hydrogenation reaction.

First Author:

Shiyu Xu

Co-author:

Fengqiong Xie,Hongmei Xie

Indexed by:

源刊论文

Correspondence Author:

Guilin Zhou

Discipline:

Engineering

Document Type:

Journal Article

Volume:

375

Page Number:

122023

Translation or Not:

no

Date of Publication:

2019-11-01

Included Journals:

SCI

Links to published journals:

https://doi.org/10.1016/j.cej.2019.122023