Investigation on n-alkane hydroisomerization, a comparison of IM-5 to ZSM-5 zeolites
Investigation on n-alkane hydroisomerization, a comparison of IM-5 to ZSM-5 zeolites
复制标题
正烷烃加氢异构化研究，IM-5 与 ZSM-5 沸石的比较
DOI：
10.1021/acs.iecr.8b03918
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发表时间：
2018
影响因子：
4.2
通讯作者：
Baojian Shen
中科院分区：
文献类型：
--
作者：
Qianqian Yu;Zhigang Huang;Houxiang Sun;Lei Li;Xiaochun Zhu;Shenyong Ren;Baojian Shen
沸石的孔隙率和酸性是高效催化剂设计的关键因素。在这里，我们调查的异构化性能的高硅沸石IM-5，具有独特的有限的2.5 nm的“纳米板”孔结构。正庚烷和甲苯的吸附实验表明，与ZSM-5相比，IM-5的吸附量和吸附速率更高，使正C7和正C16加氢异构化反应的异构体选择性分别提高了19.5%和91.5%。此外，IM-5由于其更强的酸位点，还显示出更高的n-C7或n-C16转化率。另外，引入IM-5中的中孔显著增加异构体选择性，特别是对于长链n-C16。介孔M-IM-5的C7异构体和C16异构体的选择性比微孔IM-5分别提高了73.3%和216.1%。中孔和减小的扩散长度促进了大体积分子的传质，然后减少了消耗支化异构体产物的后续裂化副反应。
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 ofn-heptane and toluene, resulted in a higher isomer selectivity inn-C7or n-C16hydroisomerization reactions, which increased relatively by 19.5% and 91.5%, respectively. Furthermore, IM-5 also shows highern-C7orn-C16conversion due to its more strong acid sites. Additionally, mesopore introduction into IM-5 significantly increases isomer selectivity, especially for long chainn-C16. The selectivities of C7isomers and C16isomers 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.