The effect of K promotion and CoO crystal forms on the catalytic performance of CoO/CNTs catalysts for CO2 hydrogenation
Open Access
- 22 October 2025
- journal article
- research article
- Published by Springer Nature in Surface Science and Technology
- Vol. 3 (1) , 1-11
Abstract
In this work, carbon nanotubes (CNTs) were employed as supports, and CoO particles with hexagonal close-packed (hcp) or face-centered cubic (fcc) structures were deposited via ultrasonic impregnation. The influence of CoO crystal structure and potassium promotion on the catalytic performance of the supported catalysts was systematically investigated. Compared with hcp-CoO, fcc-CoO was more uniformly dispersed on CNTs, and potassium addition further stabilized cobalt dispersion. The CNTs supports effectively stabilized the CoO oxidation state, with a significant fraction of CoO retained after reaction at 400 °C. hcp-CoO/CNTs displayed markedly higher activity than fcc-CoO/CNTs, and product selectivity evolved very differently between the two catalysts. The synergy between potassium promotion and CoO phase control significantly enhanced CO and C 2+ hydrocarbon selectivity. Reduction of CoO to Co⁰ at elevated temperatures substantially increased CO₂ hydrogenation activity, albeit with a pronounced rise in CH 4 selectivity.Keywords
Funding Information
- National Natural Science Foundation of China (22372199, 22072184)
- the Fundamental Research Funds for the Central Universities, South-Central Minzu University (CZZ23014)
- Distinguished Middle-Aged and Young Scientist Foundation of the State Ethnic Affairs Commission (MZR20009, MZR220001)
This publication has 27 references indexed in Scilit:
- Crystallographic dependence of CO2 hydrogenation pathways over HCP-Co and FCC-Co catalystsApplied Catalysis B: Environment and Energy, 2022
- Highly stable and selective layered Co-Al-O catalysts for low-temperature CO2 methanationApplied Catalysis B: Environment and Energy, 2022
- Interfacing with Carbonaceous Potassium Promoters Boosts Catalytic CO2 Hydrogenation of IronACS Catalysis, 2020
- Controlling CO2 Hydrogenation Selectivity by Metal‐Supported Electron TransferAngewandte Chemie International Edition, 2020
- Deconvolution of the Particle Size Effect on CO2 Hydrogenation over Iron-Based CatalystsACS Catalysis, 2020
- Recent Advances in Carbon Dioxide Hydrogenation to Methanol via Heterogeneous CatalysisChemical Reviews, 2020
- Synergy of nanoconfinement and promotion in the design of efficient supported iron catalysts for direct olefin synthesis from syngasJournal of Catalysis, 2019
- Selective Hydrogenation of CO2 to Ethanol over Cobalt CatalystsAngewandte Chemie International Edition, 2018
- Light olefin synthesis from CO2 hydrogenation over K-promoted Fe–Co bimetallic catalystsCatalysis Today, 2015
- Hydrogen production from supercritical water reforming of glycerol over Ni/Al2O3–SiO2 catalystEnergy, 2015