Cr/SiO2 mesoporous catalysts: Effect of hydrothermal treatment and calcination temperature on the structure and catalytic activity in the gas phase dehydration and dehydrogenation of cyclohexanol
作者： Pablo M. Cuesta Zapata , Marcelo S. Nazzarro , Elio E. Gonzo , Mónica L. Parentis , Norberto A. Bonini
DOI: 10.1016/J.CATTOD.2015.04.038
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摘要: Abstract Cr/SiO2 mesoporous materials (Cr-MCM-41) were obtained by hydrothermal synthesis. The effect of treatment and calcination temperature on the structure catalytic behavior synthesized analyzed. characterized XRD, N2 adsorption–desorption, TEM-SEM, TG-DTA, FTIR-HATR, DRUV–vis XPS. promoted incorporation Cr3+ into silica network, improving their resistance to oxidation. in air produces simultaneous presence Cr6+ ions, relative amounts depend both pretreatment temperatures. ions constituted coordinative unsaturated acid centers responsible cyclohexanol cyclohexene dehydration reaction. Moreover, correspond either isolated monochromate species linked or polychromate aggregates, which produce crystalline α-Cr2O3 clusters after 450 °C. active for dehydrogenation So, although was main reaction, reaction cyclohexanone also observed
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