Investigation on n-Alkane Hydroisomerization, a Comparison of IM-5 to ZSM-5 Zeolites,Industrial & Engineering Chemistry Research

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Investigation on n-Alkane Hydroisomerization, a Comparison of IM-5 to ZSM-5 Zeolites
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-10-16 , DOI: 10.1021/acs.iecr.8b03918
Qianqian Yu ₁ , Zhigang Huang ₁ , Houxiang Sun ₁ , Lei Li ₁ , Xiaochun Zhu ₁ , Shenyong Ren ₁ , Baojian Shen ₁

Affiliation

Porosity and acidity of zeolites are key factors for highly efficient catalyst design. Herein, we investigate the isomerization performance of a high-silica zeolite IM-5 which has a unique limited 2.5 nm “nanoslab” pore structure. Compared with the reference ZSM-5, the higher adsorption amount and rate of IM-5, proven by adsorption experiments of n-heptane and toluene, resulted in a higher isomer selectivity in n-C₇ or n-C₁₆ hydroisomerization reactions, which increased relatively by 19.5% and 91.5%, respectively. Furthermore, IM-5 also shows higher n-C₇ or n-C₁₆ conversion due to its more strong acid sites. Additionally, mesopore introduction into IM-5 significantly increases isomer selectivity, especially for long chain n-C₁₆. The selectivities of C₇ isomers and C₁₆ isomers of mesoporous M-IM-5 increase relatively by 73.3% and 216.1% compared with microporous IM-5. Mesopores and reduced diffusion length facilitate the mass transport of bulky molecules, then decrease subsequent cracking side reaction that consumes branched isomer products.

中文翻译：

IM-5与ZSM-5沸石的正构烷烃加氢异构化研究

沸石的孔隙率和酸性是高效催化剂设计的关键因素。在本文中，我们研究了具有独特的受限2.5 nm“纳米平板”孔结构的高硅沸石IM-5的异构化性能。与参考ZSM-5相比，通过正庚烷和甲苯的吸附实验证明，IM-5的吸附量和吸附率更高，导致n -C ₇或nC ₁₆加氢异构化反应中的异构体选择性更高，相对提高了分别增加了19.5％和91.5％。此外，IM-5还显示出更高的n -C ₇或n -C ₁₆由于其更强的酸性位而转化。此外，将中孔引入IM-5会显着提高异构体的选择性，特别是对于长链n -C _16而言。与微孔IM-5相比，中孔M-IM-5的C ₇异构体和C ₁₆异构体的选择性相对提高了73.3％和216.1％。中孔和减小的扩散长度促进了大分子的质量传输，然后减少了随后的消耗支化异构体产物的裂化副反应。

更新日期：2018-10-17

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