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首页> 外文期刊>Journal of the Brazilian Chemical Society >Catalytic Transformation Conditions of Ethanol on Dealuminated BEA Zeolites
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Catalytic Transformation Conditions of Ethanol on Dealuminated BEA Zeolites

机译:乙醇催化转化条件在渗透岩沸石上的催化转化条件

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Catalysis is an important tool in obtaining a range of derivative products from renewable sources, such as ethanol. Solid-state dealumination using ammonium hexafluorosilicate on the BEA zeolite under the treatment at temperature of 190 ?°C, 70 mol% dealumination in the presence of humidity and washing with buffer solution at 25 ?°C generated larger pores. The absence of washing procedure for the same sample resulted in pore blockage. Ethanol dehydration reactions showed conversion of 72% (64% ethylene and 8% diethyl ether) for this sample at 300 ?°C and high weight hourly space velocity (WHSV, 3247 h-1), whereas, at the same temperature but at a low WHSV (57 h-1), the conversion was 88% (49% ethylene and 39% diethyl ether). Dealuminated BEA zeolite presented better diffusion conditions, higher hydrophobicity and generated larger pores. Impregnation with H3PW12O40, H4SiW12O40 and Nb2O5 explained the selectivity, showing that Lewis acid sites from Nb2O5 favored the diethyl ether production.
机译:催化是获得来自可再生来源的一系列衍生产品的重要工具,例如乙醇。在200℃的温度下,在20℃的温度下使用六氟硅酸盐在BEA沸石上使用铵渗透,在湿度存在下,在25Ω℃下用缓冲溶液洗涤70mol%的洪水。没有对相同样品的洗涤程序导致孔隙堵塞。乙醇脱水反应显示该样品的转化率为72%(64%乙烯和8%乙醚),在300℃和高重量的小时间速度(WHSV,3247 H-1),而在相同的温度下但是在a低WHSV(57H-1),转化为88%(49%乙烯和39%的乙醚)。 Dealminated Bea zeolite呈现出更好的扩散条件,更高的疏水性和产生更大的毛孔。浸渍H3PW12O40,H4SIW12O40和NB2O5解释了选择性,显示来自NB2O5的路易斯酸位点赞成二乙醚的产生。

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