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化工学报  2015 

ZSM-5分子筛上轻烃裂解性能:晶粒尺寸的影响

DOI: 10.11949/j.issn.0438-1157.20150290, PP. 3940-3949

Keywords: 分子筛,烷烃,催化(作用),ZSM-5,晶粒尺寸,正庚烷,费-托石脑油,催化裂化/裂解,低碳烯烃

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Abstract:

设计合成了纳米、亚微米和微米级晶粒尺寸ZSM-5分子筛,并研究了其在两种反应温度下(510,650℃)对正庚烷催化制低碳烯烃反应行为。结果表明,在反应初始阶段,两种反应温度下晶粒尺寸对正庚烷转化率和产物选择性影响较小。但随着反应进行,纳米和亚微米ZSM-5在510℃下反应性能(低碳烯烃选择性及反应活性稳定性)相近且均高于微米ZSM-5;而650℃下,具有更短扩散路径和更大外表面积的纳米ZSM-5则体现出更高的反应性能。微米ZSM-5在两种温度下虽具有相对较高的低碳烯烃选择性,但其活性稳定性最低。进一步研究晶粒尺寸对费-托过程中石脑油催化裂解性能的影响发现,亚微米ZSM-5表现出最高的催化反应性能,这可能与反应原料的组成及相关反应途径变化有关。

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