Citation: Xiaorui Chen, Xuan Luo, Tongming Su, Xinling Xie, Liuyun Chen, Yuejing Bin, Zuzeng Qin, Hongbing Ji. Ga-doped Cu/γ-Al₂O₃ bifunctional interface sites promote the direct hydrogenation of CO₂ to DME[J]. Acta Physico-Chimica Sinica, ;2025, 41(10): 100126. doi: 10.1016/j.actphy.2025.100126 shu

Ga-doped Cu/γ-Al₂O₃ bifunctional interface sites promote the direct hydrogenation of CO₂ to DME

Xiaorui Chen ¹ ,
Xuan Luo ¹ ,
Tongming Su ¹ ,
Xinling Xie ¹ ,
Liuyun Chen ¹ ,
Yuejing Bin ² ,
Zuzeng Qin ^1,, ,
Hongbing Ji ^{1, 3}

1.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi Zhuang Autonomous Region, China
2.
College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545005, Guangxi Zhuang Autonomous Region, China
3.
Zhejiang Green Petrochemical and Light Hydrocarbon Transformation Research Institute, Zhejiang University of Technology, Hangzhou 310014, Zhejiang Province, China

Corresponding author: Zuzeng Qin, qinzuzeng@gxu.edu.cn
Received Date: 5 May 2025
Revised Date: 21 June 2025
Accepted Date: 24 June 2025

Fund Project: the National Natural Science Foundation of China 22078074the Guangxi Key Research and Development Program GuikeAB25069513

The reaction of CO₂ catalytic hydrogenation to dimethyl ether (DME) usually relies on a Cu-containing metal oxide/molecular sieve system; however, the migration of copper species to molecular sieves is unavoidable during the reaction, leading to the loss of Cu⁰ sites and acidic sites. In this work, a Cu/x%Ga-γ-Al₂O₃ bifunctional catalyst was synthesized via the coprecipitation method. Ga was doped into the γ-Al₂O₃ lattice at a low concentration, forming interfacial active sites with surface Cu⁰ species to achieve the hydrogenation of CO₂ to DME. Experimental studies combined with Density functional theory (DFT) calculations demonstrate that the catalyst remains stable for 180 h and that the Ga-doped Cu/γ-Al₂O₃ interface sites exhibit catalytic effects on CO₂ hydrogenation to CH₃OH and CH₃OH dehydration to produce DME. The doping of Ga increases the specific surface area of the catalyst, reduces the particle size of Cu⁰, enhances the number of acidic and basic sites on the catalyst, and promotes the adsorption of H₂ and CO₂. In addition, a new reaction pathway for DME synthesis was proposed. This work removes the dehydrated component of a traditional Cu-based bifunctional catalyst, enabling two reactions to occur at the same active sites, thus providing a new strategy for the design of novel dimethyl ether synthesis bifunctional catalysts.
- Bifunctional catalyst,
- CO₂ hydrogenation,
- DME synthesis,
- Interface,
- Ga-doped,
- DFT calculation
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Ga-doped Cu/γ-Al2O3 bifunctional interface sites promote the direct hydrogenation of CO2 to DME

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通讯作者: 陈斌, bchen63@163.com

Ga-doped Cu/γ-Al₂O₃ bifunctional interface sites promote the direct hydrogenation of CO₂ to DME