Analysis of dehydrogenation performance and deactivation cause of methylcyclohexane on Pt/Al<sub>2</sub>O<sub>3</sub> catalyst

ZHANG Jun; CHEN Yizhi; JIANG Lele; ZHANG Mingsheng; QIAO Sha; HU Zhibiao; SU Min; ZHANG Xinbo; ZHENG Heng

doi:10.12434/j.issn.2097-2547.20250025

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Analysis of dehydrogenation performance and deactivation cause of methylcyclohexane on Pt/Al₂O₃ catalyst

更新时间：2025-12-25

- Analysis of dehydrogenation performance and deactivation cause of methylcyclohexane on Pt/Al₂O₃ catalyst
- Vol. 50, Issue 12, Pages: 129-136(2025)
- 作者机构：
  
  西南化工研究设计院有限公司多孔材料与分离转化全国重点实验室，国家碳一化学工程技术研究中心，四川成都 610225
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250025
  CLC： TQ426.82;O643.32+2
- Received：16 January 2025，
  
  Revised：2025-03-05，
  
  Published：25 December 2025
- 稿件说明：
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张俊,陈艺之,蒋乐乐等.Pt/Al₂O₃催化剂上甲基环己烷脱氢性能及失活原因分析[J].低碳化学与化工,2025,50(12):129-136.

ZHANG Jun,CHEN Yizhi,JIANG Lele,et al.Analysis of dehydrogenation performance and deactivation cause of methylcyclohexane on Pt/Al₂O₃ catalyst[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(12):129-136.
张俊,陈艺之,蒋乐乐等.Pt/Al₂O₃催化剂上甲基环己烷脱氢性能及失活原因分析[J].低碳化学与化工,2025,50(12):129-136. DOI： 10.12434/j.issn.2097-2547.20250025.

ZHANG Jun,CHEN Yizhi,JIANG Lele,et al.Analysis of dehydrogenation performance and deactivation cause of methylcyclohexane on Pt/Al₂O₃ catalyst[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(12):129-136. DOI： 10.12434/j.issn.2097-2547.20250025.

摘要

甲基环己烷（MCH）-甲苯液态储氢是安全高效的氢气低价储运技术之一，MCH脱氢催化剂是制约该技术工业应用的瓶颈。探究用于MCH脱氢的Pt/Al

催化剂失活的主要原因可为高性能催化剂的研发提供参考。以成型的Pt/

-Al

小球为模型催化剂，研究了该催化剂反应190 h的催化性能，并对反应前后催化剂的物化性质进行了表征，分析了其失活原因。结果表明，反应190 h后，该催化剂的MCH转化率从97.56%下降至76.70%，除炭再生后转化率可恢复至90.00%，证实了积炭是催化剂失活的主要原因之一。同时发现Pt颗粒结晶度增大，Pt分散度从55.36%降低至34.09%，也是催化剂失活的主要原因之一。未来可考虑通过载体改性及助剂掺杂方式优化设计催化剂。

Abstract

Methylcyclohexane(MCH)-toluene liquid hydrogen storage is one of the safe and efficient low-cost hydrogen storage and transportation technologies. MCH dehydrogenation catalyst is the bottleneck of its industrial application. Exploring main reason for deactivation of Pt/Al

catalyst for MCH dehydrogenation can provide reference for the development of high-performance catalysts. Using the formed Pt/

-Al

pellets as the model catalyst

the catalytic performance of the catalyst for 190 h was studied. The physical and chemical properties of the catalyst before and after the reaction were characterized

and the reasons for its deactivation were analyzed. The results show that the MCH conversion rate decreases from 97.56% to 76.70% after 190 h reaction

and the conversion recoveres to 90.00% after carbon removal regeneration

which confirms that carbon deposition is one of the main reasons for catalyst deactivation. It is found that the crystallite size of Pt particles grows up and the dispersion of Pt particles decreases fr

om 55.36% to 34.09%

which is also the main cause of catalyst deactivation. In the future

it can be considered to optimize the design of dehydrogenation catalyst through the modification of carrier and doping of additives.

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Analysis of dehydrogenation performance and deactivation cause of methylcyclohexane on Pt/Al2O3 catalyst

DOI：10.12434/j.issn.2097-2547.20250025

摘要

Abstract

关键词

Keywords

references

Analysis of dehydrogenation performance and deactivation cause of methylcyclohexane on Pt/Al₂O₃ catalyst