Effects of CeO2 exposed facets on catalytic performances of Rh-CeO2 catalysts for CO2 methanation

YANG Hongli; CHANG Panpan; DONG Jinshi

doi:10.12434/j.issn.2097-2547.20250332

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Effects of CeO₂ exposed facets on catalytic performances of Rh-CeO₂ catalysts for CO₂ methanation

更新时间：2026-06-25

- Effects of CeO₂ exposed facets on catalytic performances of Rh-CeO₂ catalysts for CO₂ methanation
- Vol. 51, Issue 6, Pages: 1-12(2026)
- 作者机构：
  
  广西科技大学生物与化学工程学院，广西柳州 545000
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250332
  CLC： TQ426
- Received：02 August 2025，
  
  Revised：2025-08-28，
  
  Published：25 June 2026
- 稿件说明：
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杨红丽,常盼盼,董金诗.CeO₂暴露晶面对Rh-CeO₂催化剂CO₂甲烷化催化性能的影响[J].低碳化学与化工,2026,51(6):1-12. DOI: 10.12434/j.issn.2097-2547.20250332.

YANG Hongli,CHANG Panpan,DONG Jinshi.Effects of CeO₂ exposed facets on catalytic performances of Rh-CeO₂ catalysts for CO₂ methanation[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(6):1-12. DOI: 10.12434/j.issn.2097-2547.20250332.
杨红丽,常盼盼,董金诗.CeO₂暴露晶面对Rh-CeO₂催化剂CO₂甲烷化催化性能的影响[J].低碳化学与化工,2026,51(6):1-12. DOI: 10.12434/j.issn.2097-2547.20250332. DOI：

YANG Hongli,CHANG Panpan,DONG Jinshi.Effects of CeO₂ exposed facets on catalytic performances of Rh-CeO₂ catalysts for CO₂ methanation[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(6):1-12. DOI: 10.12434/j.issn.2097-2547.20250332. DOI：

摘要

甲烷化是实现“碳中和”的重要化学手段之一，然而开发具有高甲烷（CH

）选择性的催化剂具有一定挑战。采用煅烧法和水热合成法制备了不同微观形貌的CeO

载体，并负载质量分数为0.5%的Rh制备了CeO

暴露晶面不同的Rh-CeO

催化剂，通过不同表征方法，系统探究了CeO

暴露晶面对Rh-CeO

催化剂CO

甲烷化催化性能的影响。结果显示，0.5Rh-CeO

-NC（NC表示纳米立方体）催化性能最优，400 °C时CH

选择性高达76%，CH

产率为29.19%。CeO

(100)晶面在还原预处理后更容易形成表面氧空位，有利于CO

活化，并且富电子的Rh单原子聚集成纳米颗粒，加强了H

活化，从而促进了CH

生成。原位DRIFTS证实Rh-CeO

催化剂作用下，CO

甲烷化遵循甲酸盐路径与CO路径共存的机制，且两种路径的竞争关系受CeO

暴露晶面调控。

Abstract

methanation is one of the important chemical strategies to achieve “carbon neutrality”. However

developing catalysts with high methane (CH

)

selectivity remains challenging. CeO

supports with different morphologies were prepared via calcination or hydrothermal method

and Rh-CeO

catalysts with different exposed facets of CeO

were prepared by loading 0.5% (mass fraction) Rh. The effects of the exposed facets of CeO

on catalytic performances of Rh-CeO

catalysts for CO

methanation were systematically investigated. The results show that 0.5Rh-CeO

-NC (NC represents nano-cube) exhibits the best catalytic performance with CH

selectivity of 76% and CH

yield of 29.19% at 400 ℃. The CeO

(100) facet facilitates the formation of surface oxygen vacancies after reduction pretreatment

which promotes CO

activation

and electron-rich Rh single atoms aggregate into nanoparticles

enhancing H

activation and promoting CH

formation. In situ DRIFTS confirms that CO

methanation with Rh-CeO

catalysts follows a dual-path mechanism of formate pathway and CO pathway

and the competition between these two pathways is regulated by CeO

exposed facets.

关键词

Keywords

references

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