The diffusion of methanol in a catalyst pellet containing H-ZSM-5 zeolite and aluminum oxide before and after coke deposition in the conversion of methyl alcohol into dimethyl ether and C2–C4 alkenes is studied. It is shown that the diffusion regime of methanol is anomalous and that the anomalous diffusion exponent does not depend on coke deposition of the catalyst. The discovered features are caused by the adsorption of methanol in the micropores, access to which is not fully restricted as a result of coke deposition.

中文翻译：

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焦炭沉积对甲醇在含沸石催化剂球团中扩散的影响

研究了甲醇在甲醇转化为二甲醚和 C2-C4 烯烃过程中在焦炭沉积前后甲醇在含有 H-ZSM-5 沸石和氧化铝的催化剂颗粒中的扩散。结果表明，甲醇的扩散方式是反常的，反常扩散指数不依赖于催化剂的焦炭沉积。发现的特征是由甲醇在微孔中的吸附引起的，由于焦炭沉积，对微孔的访问并没有完全限制。