In recent years, people are increasingly interested in CO2 hydrogenation to produce value-added chemicals and fuels ( CH4, CH3OH, etc.). In the quest for an efficient treatment in CO2 methanation and methanolization, several technologies have been practiced, and DBD plasma technology gain attention due to its easily handling, mild operating conditions, strong activation ability, and high product selectivity. In addition, its reaction mechanism and the effect of packing materials and reaction parameters are still controversial. To address these problems efficiently, a summary of the reaction mechanism is presented. A discussion on plasma-catalyzed CO2 hydrogenation including packing materials, reaction parameters, and optimizing methods is addressed. In this review, the overall status and recent findings in DBD plasma-catalyzed CO2 hydrogenation are presented, and the possible directions of future development are discussed.

Research progress and the prospect of CO2 hydrogenation with dielectric barrier discharge plasma technology
    Abstract
    1 Introduction
    2 Reaction mechanism of DBD plasma catalysis
    3 Effects and optimizations
        3.1 Packing materials
        3.2 Reaction parameters of DBD plasm system
            3.2.1 Discharge power
            3.2.2 Discharge frequency
            3.2.3 Discharge length
            3.2.4 Feed flow rate
            3.2.5 Discharge gap
        3.3 Optimization of DBD system
    4 CO2 hydrogenation to methane
        4.1 Ruthenium-based catalyst
        4.2 Nickel-based catalyst
        4.3 Metal–organic framework materials
    5 CO2 hydrogenation to methanol
        5.1 Photocatalysis
        5.2 Electrocatalysis
        5.3 Plasma catalysis
    6 Conclusion
    Acknowledgements 
    References

• Ziyi Zhang(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
• Honglei Ding(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China, Shanghai Power Environmental Protection Engineering Technology Research Center, Shanghai 201600, China, Key Laboratory of Environmental Protection Technology for Clean Power Generation in Machinery Industry, Shanghai 200090, China, Shanghai Non-carbon energy conversion and utilization institute, Shanghai 200240, China)
• Qi Zhou(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China, Zhejiang Products Environmental Protection Energy Co, Hangzhou, China)
• Weiguo Pan(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China, Shanghai Power Environmental Protection Engineering Technology Research Center, Shanghai 201600, China, Key Laboratory of Environmental Protection Technology for Clean Power Generation in Machinery Industry, Shanghai 200090, China, Shanghai Non-carbon energy conversion and utilization institute, Shanghai 200240, China)
• Kaina Qiu(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
• Xiaotian Mu(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
• Junchi Ma(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
• Kai Zhang(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
• Yuetong Zhao(College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)