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OALib Journal期刊
ISSN: 2333-9721
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tpaoh/naoh混合碱体系对zsm-5沸石的改性及其催化性能研究
, PP. 583-588
Keywords: 介孔,沸石,zsm-5,碱处理,mto
Abstract:
？采用四丙基氢氧化铵和氢氧化钠有机无机混合碱tpaoh/naoh体系对zsm-5分子筛进行改性处理,得到了具有介孔和微孔的zsm-5分子筛。用xrd、n2吸附脱附、nh3-tpd、sem等手段对改性后的产物进行表征。结果表明,碱处理zsm-5分子筛会使分子筛同时脱硅和脱铝。当混合碱体系中总oh-浓度一定时,随tpa+/oh-比值的降低和处理时间的延长,均会使分子筛的微孔结构数量减少,介孔结构数量增加。同时,还会改变分子筛的酸性,tpa+/oh-比值适合的混合碱体系可在生成介孔的同时最大限度保留微孔结构,并减少分子筛的强酸数量,在甲醇制烯烃反应(mto)中表现出较高的丙烯选择性。与无机碱naoh相比,tpaoh对分子筛的改性速率较慢而且温和,具有可控性,可以起到孔道生长调节剂的作用。
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