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Engineering CuZnOAl2O3 Catalyst for Enhancing CO2 Hydrogenation to Methanol
Peixiang Shi1,2, Jiahao Han1, Yuhao Tian1
1State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Abstract:
The CuZnOAl2O3 catalyst shows excellent activity and selectivity in the reaction of CO2 hydrogenation to methanol as a consequence of its controllable physicochemical properties, which is expected to offer an efficient route to renewable energy. In this study, CuZnOAl2O3 catalysts are engineered by a special pretreatment, constructing a carbonate structure on the surface of the catalyst. Compared to the unmodified catalyst, the optimized catalyst (CZA-H-C1) not only exhibits an improved methanol selectivity of 62.5% (250 °C and 3 MPa) but also retains a minimal degree of deactivation of 9.57% over a 100 h period. By characterizing the catalysts with XRD, TEM, XPS and in situ DRIFTS spectroscopy, it was found that the surface carbonate species on Cu-based catalysts could significantly enhance the reaction and shield the active sites. This study offers theoretical insights and practical strategies for the rational design and optimization of high-performance heterogeneous catalysts.
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