Energy-Efficient One-Step Synthesis of a [Re,W]/α-Al2O3 Ceramic Catalytic Converter for the Dehydrogenation of Ethylbenzene to Styrene
Tóm tắt
A porous ceramic catalytic converter was synthesized on the basis of a coarse α-Al2O3 powder filler using ultrafine strengthening binders of the MgO + SiC + SiO2 composition and catalytically active Re2O7 and WO3 components (up to 4 wt %). Double-sided compression of the starting mixture under a pressure from 70 to 90 MPa followed by sintering of the samples at temperatures from 1200 to 1400°C was applied. The synthesized ceramic catalytic converters possessed an open porosity of about 40% and a pore size of 0.5 to 1.5 μm. The styrene selectivity of about 30% and the productivity up to 30 g h–1 dm–3 in the temperature range from 600 to 700°С were experimentally achieved. The degree of catalyst carbonization within the experimental time (6 h) did not exceed 0.31 wt %. The scientific principles of a one-step technology for the synthesis of a porous ceramic with simultaneous imparting of catalytic properties thereto were developed. The obtained ceramic catalytic converters of the [Re,W]/α-Al2O3 composition can produce styrene with a high efficiency in a wide temperature range.
Tài liệu tham khảo
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