The influence of the loading position of Pt/HZSM-22 and Pt/HMOR in the catalyst bed on the n-dodecane hydroisomerization performance

IF 4.7 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-08-23 DOI:10.1016/j.micromeso.2025.113827

Jiangnan Xiang , Haiying Lu , Wei Zhang , Yujie Duan , Wenrui Jin , Yumeng Guo , Yan Wang , Jinghong Ma , Ruifeng Li , Liming Gai , Xiaowei Wang , Jianle Hou

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Abstract

Pt/HMOR and Pt/HZSM-22 catalysts were prepared by mechanical grinding pre-prepared Pt/Al₂O₃ (prepared via excess wetness impregnation using H₂PtCl₆·6H₂O) with HMOR and HZSM-22 zeolites, respectively, at a 1:1 mass ratio. The influence of the loading position of Pt/HZSM-22 and Pt/HMOR in the catalyst bed on the n-dodecane hydroisomerization performance was systematically investigated using n-dodecane as the model reactant. By adjusting the relative positions of Pt/HZSM-22 and Pt/HMOR in catalyst bed, the isomers selectivity and yield of catalyst Pt/HMOR(U)-Pt/HZSM-22(D) (U and D represent the upstream catalyst bed and downstream catalyst bed, respectively) were higher than Pt/HZSM-22(U)-Pt/HMOR(D) and the difference of yield of mono-branched isomers and multi-branched isomers reached the maximum of 31.31 % and 16.78 % at the reaction temperature of 320 °C and 340 °C, respectively. In order to explore the reaction process of isomers on Pt/HZSM-22 and Pt/HMOR, 2-methylpentane was selected as the probe molecule. The results were shown that 2-methylpentane would undergo isomerization reaction on Pt/HMOR to form 2,3-dimethylbutane, while the ability to produce 2,3-dimethylbutane on Pt/HZSM-22 was weaker.

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Pt/HZSM-22和Pt/HMOR在催化剂床上的装载位置对正十二烷加氢异构化性能的影响

Pt/HMOR和Pt/HZSM-22催化剂分别以HMOR和HZSM-22分子筛为原料，以1:1的质量比机械研磨制备Pt/HMOR和Pt/HZSM-22催化剂。以正十二烷为模型反应物，系统研究了Pt/HZSM-22和Pt/HMOR在催化剂床上的装载位置对正十二烷加氢异构化性能的影响。通过调整Pt/HZSM-22和Pt/HMOR在催化剂床中的相对位置，催化剂Pt/HMOR(U)-Pt/HZSM-22(D) （U和D分别代表上游催化剂床和下游催化剂床）的异构体选择性和产率均高于Pt/HZSM-22(U)-Pt/HMOR(D)，在反应温度为320℃和340℃时，单支异构体和多支异构体的产率差异最大，分别为31.31%和16.78%。为了探索Pt/HZSM-22和Pt/ hmore上异构体的反应过程，选择2-甲基戊烷作为探针分子。结果表明，2-甲基戊烷在Pt/HZSM-22上可发生异构化反应生成2,3-二甲基丁烷，而在Pt/HZSM-22上生成2,3-二甲基丁烷的能力较弱。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.