Insights into the Behaviors of the Catalytic Combustion of Propane over Spinel Catalysts
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Insights into the Behaviors of the Catalytic Combustion of Propane over Spinel Catalysts Yang Gao1,2 · Sheng Wang1 · Lirong Lv1,2 · Deyi Li1 · Xu Yue1 · Shudong Wang1 Received: 29 February 2020 / Accepted: 24 April 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The behaviors of C3H8 catalytic combustion were investigated over spinel AB2O4 (AB2O4 prepared by co-precipitation method) with two transition metal (A and B are both transition metal elements) and single transition metal (A is transition metal element). Results showed that the spinel A Fe2O4 (A = Ni, Cu) owned superior catalytic activities than the spinel AAl2O4 (A = Ni, Cu). In combination with XRD, SEM, Raman, XPS and H2-TPR, it could be deduced that higher activity was dependent on abundant surface oxygen vacancy and adsorbed oxygen species. The oxygen activation was enhanced by the doping of another transition metal in B sites of AB2O4. As a result, the catalytic performance was promoted. Among as-prepared catalysts, NiFe2O4 owned more superior activity and hydrothermal stability for C3H8 combustion than noble metal catalyst. It is expected to be applicable in the removal of VOCs. Graphic Abstract Due to the B-site transition metal doping, the surface oxygen activation behavior of the spinel catalyst can be modulated, which makes AFe2O4 have a higher propane catalytic activity than AAl2O4.
Keywords VOCs · Spinel · Bi-active metal · Propane · Catalytic combustion
1 Introduction * Sheng Wang [email protected] 1
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People’s Republic of China
University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
2
Volatile organic compounds (VOCs) are important air pollutants, and their emissions will induce haze and ozone pollution. Some of them are even carcinogenic and genotoxic. In view of the harm of VOCs to the environment and human health [1–4], the development of VOCs removal technologies has received wide attention. Among the technologies to eliminate the end-of-pipe diluted VOCs, catalytic
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combustion possesses low concentration limit, high purification efficiency and less secondary pollution [3, 5–10]. And it can satisfy the more strict forthcoming emission standards. Therefore it is considered to be the most promising technology for VOCs end-of-pipe treatment [5, 9–14]. Nevertheless the catalyst with superior activity, hydrothermal stability and tolerant heteroatom was the bottleneck for the application of catalytic combustion in VOCs removal. Combustion catalysts mainly include precious metal catalysts (such as Pt [12], Pd [15], Ru [16, 17], and Au [17]), non-precious metal catalysts (such as M nO2 [8], CuO [11], Co3O4 [14], and CeO2 [18]), and composite oxide catalysts (such as perovskite [19, 20] and spinel [21]). Noble metal catalysts have high catalytic activity, but their extensive applications were suppresse
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