Abstract

Two granulated zeolite samples were synthesized and tested: a binder-containing (at least 20 wt %) ZSM-5 in the H-form and a high-crystallinity (at least 95 wt %) H-form ZSM-5 with a hierarchical porous structure. The catalytic properties of these samples were comparatively assessed, for the first time, in processes for the conversion of methanol and straight-run gasoline into high-octane components of engine fuels. The granulated zeolites prepared by different methods were found to differ in the content of the zeolite phase, the concentration of acid sites, and the porous properties. The study demonstrated the effects of the acid and structural properties of the zeolite samples on their activity, molecular sieve selectivity, and stability in the above-mentioned catalytic processes. In terms of catalytic properties, the hierarchical porous granulated zeolite proved to be superior to the binder-containing zeolite prepared by a conventional technique. Furthermore, the hierarchical porous catalyst showed a longer service life in methanol conversion. In the upgrading of straight-run gasoline, this catalyst enables the production of motor gasoline in compliance with applicable standards at lower reaction temperatures.

中文翻译：

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不同浓度H型ZSM-5沸石粒状催化剂催化甲醇和直馏汽油转化

摘要

合成并测试了两种粒状沸石样品：含粘合剂（至少 20 wt%）的 H 型 ZSM-5 和高结晶度（至少 95 wt%）的 H 型 ZSM-5，具有分级多孔结构结构体。这些样品的催化性能首次在甲醇和直馏汽油转化为发动机燃料的高辛烷值组分的过程中进行了比较评估。发现不同方法制备的粒状沸石在沸石相含量、酸位浓度和多孔性能方面存在差异。该研究证明了沸石样品的酸和结构性质对它们在上述催化过程中的活性、分子筛选择性和稳定性的影响。在催化性能方面，分层多孔粒状沸石证明优于通过常规技术制备的含粘合剂的沸石。此外，分级多孔催化剂在甲醇转化中表现出更长的使用寿命。在直馏汽油的提质中，该催化剂能够在较低反应温度下生产符合适用标准的车用汽油。