Abstract
Vanadium oxides, as highly efficiently catalysts, are widely applied in various catalytic reactions, such as the dehydrogenation of light alkanes and epoxidation of alkenes. In this paper, a series of VO x /Al 2 O 3 catalysts were fabricated by the 1-pot method for catalytic propane dehydrogenation. The results indicated that the VO x /Al 2 O 3 catalysts with loading of 10 wt.% vanadium exhibited optimized catalytic performance. The as-prepared catalysts were characterized by N 2 adsorption-desorption, XRD, TEM, H 2 -TPR, and XPS to explore the texture properties, morphology, and electronic environment of vanadium. In addition, several vanadium catalysts were also prepared by the incipient wetness impregnation (IWI) method to compare their catalytic performance with the 1-pot synthesized catalysts. The catalysts synthesized by the 1-pot method exhibited higher selectivity of propylene and longer catalyst lifetime at high propane conversion when compared to the counterpart synthesized by the IWI method.
Highlights
Propylene is a fundamental and key feedstock for the production of important chemical intermediates such as polypropylene, acrylonitrile, and 2-propanol [1]
Vanadium catalysts are mainly applied in the oxidative dehydrogenation of propane, researchers have found that they displayed excellent catalytic performance and high stability for propane dehydrogenation (PDH) [8,9]
Gong et al found that VO x /Al 2 O 3 catalysts prepared by the incipient wetness impregnation (IWI) method exhibited extremely high selectivity for propylene (80%) with 35% conversion of propane [5]
Summary
Propylene is a fundamental and key feedstock for the production of important chemical intermediates such as polypropylene, acrylonitrile, and 2-propanol [1]. Vanadium catalysts are mainly applied in the oxidative dehydrogenation of propane, researchers have found that they displayed excellent catalytic performance and high stability for PDH [8,9]. Gong et al found that VO x /Al 2 O 3 catalysts prepared by the incipient wetness impregnation (IWI) method exhibited extremely high selectivity for propylene (80%) with 35% conversion of propane [5]. Despite the enhancement of catalytic performance, these catalysts, prepared by the multistep synthetic method, normally result in the poor dispersion of active metal [13]. Filez et al synthesized Pt-based catalysts by the 1-pot method that achieved superior catalytic performance for PDH [23]. Properties of the catalysts were investigated by N 2 adsorption-desorption, XRD, TEM, H 2 -TPR, and XPS for a better understanding of catalytic behavior
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