Modulating isomers distribution of n-dodecane hydroisomerization by mordenite-ZSM-22 composite zeolite

IF 7.2 2区工程技术 Q1 CHEMISTRY, APPLIED Fuel Processing Technology Pub Date : 2024-10-10 DOI:10.1016/j.fuproc.2024.108140

Jiangnan Xiang, Wei Zhang, Yuting Wang, Haiying Lu, Yan Wang, Weijiong Dai, Binbin Fan, Jiajun Zheng, Jinghong Ma, Ruifeng Li

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Abstract

Mordenite-ZSM-22 composite zeolite is prepared by the physical mixing. The structure, pore properties, acid properties and diffusion properties of samples are characterized by the means of XRD, N₂ physical adsorption-desorption, SEM, TEM, NH₃-TPD, Py-IR, and ZLC. The pore properties and acid properties of mordenite-ZSM-22 composite zeolite can be efficiently modulated by changing mass ratio of mordenite and ZSM-22. In n-C₁₂ hydroisomerization reaction, Pt/HMZ-x displays great capacity in modulate n-dodecane isomers distribution (mono-branched i-C₁₂, multi-branched i-C₁₂, terminal branched i-C₁₂ and central branched i-C₁₂), these results are ascribed to that these composite zeolite catalysts combined the topology structure advantage of mordenite and ZSM-22. When reaction temperature is 280 °C, the ratio of mono-branched i-C₁₂ selectivity to multi-branched i-C₁₂ selectivity (S_MB/S_MTB) of Pt/HZSM-22, Pt/HMZ-1, Pt/HMZ-3, Pt/HMZ-5 and Pt/HMOR were 37.64, 15.04, 5.48, 5.20 and 1.47, respectively. The ZLC diffusion experiment results indicate that low isomer selectivity of Pt/HMOR is due to its poor diffusivity. On the contrary, Pt/HZSM-22 favors the diffusion of reactants and has better catalytic performance.

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利用莫来石-ZSM-22 复合沸石调节正十二烷加氢异构化的异构体分布

采用物理混合法制备了莫来石-ZSM-22 复合沸石。通过 XRD、N2 物理吸附-解吸、SEM、TEM、NH3-TPD、Py-IR 和 ZLC 等方法对样品的结构、孔隙性质、酸性和扩散性质进行了表征。通过改变莫来石和 ZSM-22 的质量比，可以有效地调节莫来石-ZSM-22 复合沸石的孔隙性质和酸性。在正十二烷加氢异构化反应中，Pt/HMZ-x 在调节正十二烷异构体分布（单支链 i-C12、多支链 i-C12、末端支链 i-C12 和中心支链 i-C12）方面表现出很强的能力，这些结果归因于这些复合沸石催化剂结合了莫来石和 ZSM-22 的拓扑结构优势。当反应温度为 280 ℃ 时，Pt/HZSM-22、Pt/HMZ-1、Pt/HMZ-3、Pt/HMZ-5 和 Pt/HMOR 的单支链 i-C12 选择性与多支链 i-C12 选择性之比（SMB/SMTB）分别为 37.64、15.04、5.48、5.20 和 1.47。ZLC 扩散实验结果表明，Pt/HMOR 的异构体选择性低是由于其扩散性差。相反，Pt/HZSM-22 有利于反应物的扩散，具有更好的催化性能。

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来源期刊

Fuel Processing Technology 工程技术-工程：化工

CiteScore

13.20

自引率

9.30%

发文量

398

审稿时长

26 days

期刊介绍： Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.