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在常用的丁烯氧化脱氢 Mo—Bi—P—Fe—Co—Ni—K七组分催化剂的研究基础上,应用催化的基本原理,结合有关的国外专刊文献,提出用Sb代P,用K—Mg来调节催化剂的碱度,认为Mo—Bi盐的催化活性组分可能是β相Bi_2O_3·2MoO_3,决定合适的共沉淀条件pH<3和活化温度<670℃,从而筛选出氧化效果较好的催化剂,其主要组分为Mo—Bi—Fe—Ni—Sb—K—Mg,载体为硅溶胶.对此催化剂进行考察后,选定了最佳的反应条件,反应温度350～400°C,水蒸气含量<30%(mol),烃氧比>2,SV1000h~(-1).本文提出的催化剂应用于C_4烃氧化时,考察结果表明1-丁烯与异丁烯的转化率都可以达到90%左右,甲基丙烯醛和丁二烯的选择性一般都可以达到70%以上.
On the basis of the research on the seven-component catalyst of oxidative dehydrogenation of butene, Mo-Bi-P-Fe-Co-Ni-K, with the basic principle of catalysis and the related foreign special literature, K-Mg to adjust the alkalinity of the catalyst. It is considered that the catalytically active component of the Mo-Bi salt may be β-phase Bi_2O_3 · 2MoO_3, and the suitable coprecipitation conditions are pH <3 and activation temperature <670 ℃, Good catalyst, the main component is Mo-Bi-Fe-Ni-Sb-K-Mg and the carrier is silica sol. After investigation of the catalyst, the optimum reaction conditions are selected. The reaction temperature is 350-400 C, water vapor content <30% (mol), oxygen to oxygen ratio> 2, SV1000h ~ (-1) .The catalyst proposed in this paper is applied to C_4 hydrocarbon oxidation, the results showed that the conversion of 1-butene and isobutene Reached about 90%, the selectivity of methacrolein and butadiene can generally reach more than 70%.