产量(工程)
ZSM-5型
催化作用
沸石
化学
分子
选择性
开裂
Crystal(编程语言)
扩散
化学工程
有机化学
材料科学
复合材料
物理
计算机科学
工程类
热力学
程序设计语言
作者
Mingwei Zhang,Linlin Liu,Wenjun Zhang,Li Wang,Xiangwen Zhang,Guozhu Li
标识
DOI:10.1016/j.micromeso.2023.112597
摘要
ZSM-48 is widely used to support Pt nanoparticles (Pt/ZSM-48) for hydroisomerization of long-chain n-paraffin due to its 10-member-ring one-dimensional pore structure. But the yield of target isomers on Pt/ZSM-48 is difficult to be improved due to easily bundled crystal bars and relatively excessive acid sites of ZSM-48, which restricts reactant diffusion and causes cracking. In this study, different types of zeolite growth modifiers (ZGMs) are screened for regulating the physicochemical property of ZSM-48, in which phenolic hydroxyl was found to be the most effective functional group. Quantitative correlations between ZGM structure and the properties of corresponding ZSM-48 crystal are achieved based on appropriate descriptors and multi-parameter regression. Then, the mechanism of ZSM-48 regulation by phenolic ZGMs is revealed. The models predict that polydopamine (PDA) is a superior ZGM for hydroisomerization, which is verified by textural characterization and reaction evaluation. Compared with the conventional catalyst, the isomer selectivity was improved effectively from 92% to over 97% when the feed conversion was lower than 80%, and the maximum yield of isomers was 89.0% as catalyzed by the PDA-regulated catalyst. The as-built models can also be used to design preferred phenolic ZGMs for preparing tailored ZSM-48 in other applications.
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