丙烷芳构化催化剂活性组分浸渍方法优化

发布时间：2018-03-18 11:22

  本文选题：分子筛　切入点：镓　出处：《化工学报》2017年S1期 　论文类型：期刊论文

【摘要】：根据现有丙烷芳构化催化剂的特性,考察等体积浸渍、真空等体积浸渍、微波等体积浸渍3种不同浸渍方法对镓改性HZSM-5催化剂性能的影响,并结合多种技术表征,分析改性后催化剂内部性能变化情况。研究发现,浸渍方法对催化剂表面镓的分散度具有明显的影响,其中真空等体积浸渍具有更好的效果,使活性组分Ga分散更均匀,更有效地降低了分子筛的B酸位、增加了L酸位,进而抑制了丙烷的裂解,增强了催化剂的脱氢、芳构化能力,并且延长了催化剂的寿命。在反应温度为525℃,丙烷质量空速(WHSV)为1h-1的条件下,取样时间为丙烷通入后1.3h,丙烷转化率达到93.8%,液相芳烃收率达到57.2%,BTX(苯、甲苯和二甲苯)收率达到48.6%。
[Abstract]:According to the characteristics of existing propane aromatization catalysts, the effects of three different impregnation methods, such as equal volume impregnation, vacuum equal volume impregnation and microwave equal volume impregnation, on the properties of gallium modified HZSM-5 catalysts were investigated. It is found that the impregnation method has an obvious effect on the dispersion of gallium on the surface of the catalyst, and the vacuum impregnation has better effect on the dispersion of Ga on the surface of the catalyst, and makes the active component Ga dispersed more evenly. The B acid site of molecular sieve is reduced more effectively, the L acid site is increased, the cracking of propane is inhibited, the dehydrogenation, aromatization ability of the catalyst is enhanced, and the life of the catalyst is prolonged, and the reaction temperature is 525 鈩，

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