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Plasma-enabled catalytic dry reforming of CH4into syngas, hydrocarbons and oxygenates: Insight into the active metals of γ-Al2O3supported catalysts

Authors :
Mei, Danhua
Sun, Minjie
Liu, Shiyun
Zhang, Peng
Fang, Zhi
Tu, Xin
Source :
Journal of CO2 Utilization; January 2023, Vol. 67 Issue: 1
Publication Year :
2023

Abstract

Dry reforming of CH4(DRM) using a plasma-enabled catalytic process is an appealing approach for reducing greenhouse gas emissions while producing fuels and chemicals. However, this is a complex process that is influenced by both catalysts and discharge plasmas, and low energy efficiency remains a challenge for this technology. Here, we developed a water-cooled dielectric barrier discharge (DBD) reactor for plasma DRM reactions over supported catalysts (Ni/γ-Al2O3, Ag/γ-Al2O3and Pt/γ-Al2O3) prepared via plasma-modified impregnation. Results show that metal loading on γ-Al2O3enhanced the basic nature of the catalysts and promoted the formation of discharge channels and reactive species. The maximum conversion of CO2(21.4 %) and CH4(27.6 %) was obtained when using Ag/γ-Al2O3. The basic nature of the catalytic materials dominated CO2conversion, whereas the properties of the catalyst and discharge plasma determined CH4conversion. The highest selectivity of hydrogen (∼34.5 %) and carbon-containing gas products (∼81.0 %) were attained when using the noble metal catalysts (Ag/γ-Al2O3and Pt/γ-Al2O3), while the highest total selectivity of liquid products (14.1 %) was achieved in the presence of Ni/γ-Al2O3. Compared with γ-Al2O3, the supported catalysts demonstrated higher stability, especially for Ag/γ-Al2O3and Pt/γ-Al2O3, which also provided higher energy efficiency for gas conversion and product formation.

Details

Language :
English
ISSN :
22129820
Volume :
67
Issue :
1
Database :
Supplemental Index
Journal :
Journal of CO2 Utilization
Publication Type :
Periodical
Accession number :
ejs61566691
Full Text :
https://doi.org/10.1016/j.jcou.2022.102307