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Methylcyclohexane (MCH) serves as an ideal hydrogen carrier in hydrogen storage and transportation process. In the continuous production of hydrogen from MCH dehydrogenation, the rational design of energy-efficient catalytic way with good performance remains an enormous challenge. Herein, an internal electric heating (IEH) assisted mode was designed and proposed by the directly electrical-driven catalyst using the resistive heating effect. The Pt/Al2O3 on Fe foam (Pt/Al2O3/FF) with unique three-dimensional network structure was constructed. The catalysts were studied in a comprehensive way including X-ray diffraction (XRD), scanning electron microscopy (SEM)-mapping, in situ extended X-ray absorption fine structure (EXAFS), and in situ CO-Fourier transform infrared (FTIR) measurements. It was found that the hydrogen evolution rate in IEH mode can reach up to above 2060 mmol·gPt−1·min−1, which is 2–5 times higher than that of reported Pt based catalysts under similar reaction conditions in conventional heating (CH) mode. In combination with measurements from high-resolution infrared thermometer, the equations of heat transfer rate, and reaction heat analysis results, the Pt/Al2O3/FF not only has high mass and heat transfer ability to promote catalytic performance, but also behaves as the heating component with a low thermal resistance and heat capacity offering a fast temperature response in IEH mode. In addition, the chemical adsorption and activation of MCH molecules can be efficiently facilitated by IEH mode, proved by the operando MCH-FTIR results. Therefore, the as-developed IEH mode can efficiently reduce the heat and mass transfer limitations and prominently boost the dehydrogenation performance, which has a broad application potential in hydrogen storage and other catalytic reaction processes.


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Boosting methylcyclohexane dehydrogenation over Pt-based structured catalysts by internal electric heating

Show Author's information Wenhan Wang1,§Guoqing Cui1,§Cunji Yan2,§Xuejie Wang1Yang Yang1Chunming Xu1,3( )Guiyuan Jiang1( )
State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China

§ Wenhan Wang, Guoqing Cui, and Cunji Yan contributed equally to this work.

Abstract

Methylcyclohexane (MCH) serves as an ideal hydrogen carrier in hydrogen storage and transportation process. In the continuous production of hydrogen from MCH dehydrogenation, the rational design of energy-efficient catalytic way with good performance remains an enormous challenge. Herein, an internal electric heating (IEH) assisted mode was designed and proposed by the directly electrical-driven catalyst using the resistive heating effect. The Pt/Al2O3 on Fe foam (Pt/Al2O3/FF) with unique three-dimensional network structure was constructed. The catalysts were studied in a comprehensive way including X-ray diffraction (XRD), scanning electron microscopy (SEM)-mapping, in situ extended X-ray absorption fine structure (EXAFS), and in situ CO-Fourier transform infrared (FTIR) measurements. It was found that the hydrogen evolution rate in IEH mode can reach up to above 2060 mmol·gPt−1·min−1, which is 2–5 times higher than that of reported Pt based catalysts under similar reaction conditions in conventional heating (CH) mode. In combination with measurements from high-resolution infrared thermometer, the equations of heat transfer rate, and reaction heat analysis results, the Pt/Al2O3/FF not only has high mass and heat transfer ability to promote catalytic performance, but also behaves as the heating component with a low thermal resistance and heat capacity offering a fast temperature response in IEH mode. In addition, the chemical adsorption and activation of MCH molecules can be efficiently facilitated by IEH mode, proved by the operando MCH-FTIR results. Therefore, the as-developed IEH mode can efficiently reduce the heat and mass transfer limitations and prominently boost the dehydrogenation performance, which has a broad application potential in hydrogen storage and other catalytic reaction processes.

Keywords: hydrogen, heat transfer, internal electrical heating, methylcyclohexane dehydrogenation, Pt/Al2O3/Fe foam (FF) structured catalyst

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Publication history
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Publication history

Received: 28 February 2023
Revised: 19 April 2023
Accepted: 23 April 2023
Published: 10 June 2023
Issue date: October 2023

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© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 22225807, 21961132026, 21878331, 22021004, and 22109177), the National Key Research and Development Program (Nos. 2020YFA0210903 and 2021YFA1501304), the PetroChina research institute of petroleum processing program (Nos. PRIKY21057 and PRIKY 21199), and the Fundamental Research Funds for the Central Universities (No. 2462020BJRC008). The authors are thankful for the support of Energy Internet Research Center, China University of Petroleum (Beijing), Haihe Laboratory of Sustainable Chemical Transformations (No. CYZC202105), the Beijing Synchrotron Radiation Facility (BSRF), and Shanghai Synchrotron Radiation Facility (SSRF) during the XAFS measurements at the beamline of 1W1B, 1W2B, and BL11B.

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