A comparative study of Mn/Co binary metal catalysts supported on two commercial diatomaceous earths for oxidation of benzeneTools Tomatis, Marco, Xu, Honghui, Wei, Chaohui, Bishop, Matthew Thomas, He, Jun, Wang, Chengjun, Zhao, Ming, Xiao, Hang, Yu, Huan, Behera, Sailesh N. and Tang, Bencan (2018) A comparative study of Mn/Co binary metal catalysts supported on two commercial diatomaceous earths for oxidation of benzene. Catalysts, 8 (3). p. 111. ISSN 2073-4344
Official URL: http://dx.doi.org/10.3390/catal8030111
AbstractTwo commercial diatomaceous earths were used as supports for the preparation of Mn/Cobinary metal catalysts at different metal loads (5 to 10 wt % Mn and 5 to 15 wt % Co) by incipientwetness deposition. The activity of the prepared catalysts towards the complete oxidation of benzeneto CO2and water was investigated between 100 and 400◦C. Raw supports and synthesized catalystswere characterized by XRD, N2physisorption, SEM-EDS, H2-TPR, and TPD. The purificationtreatment of food-grade diatomite significantly affected the crystallinity of this support whilereducing its specific surface area (SSA). A loss of SSA, associated with the increase in the metalload, was observed on samples prepared on natural diatomite, while the opposite trend occurredwith food-grade diatomite-supported catalysts. Metal nanoparticles of around 50 nm diameter wereobserved on the catalysts’ surface by SEM analysis. EDS analysis confirmed the uniform depositionof the active phases on the support’s surface. A larger H2consumption was found by TPR analysisof natural diatomite-based samples in comparison to those prepared at the same metal load onfood-grade diatomite. During the catalytic oxidation experiment, over 90% conversion of benzenewere achieved at a reaction temperature of 225◦C by all of the prepared samples. In addition, theformation of coke during the oxidation tests was demonstrated by TGA analysis and the solublefraction of the produced coke was characterized by GC-MS.
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