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Synthesis, characterisation, and performance evaluation of promoted Ni‐based catalysts for thermocatalytic decomposition of methane

Awad, Ali and Alnarabiji, Mohamad S. and Salam, M. A. and Vo, Dai-Viet N. and Setiabudi, H. D. and Bawadi, Abdullah (2020) Synthesis, characterisation, and performance evaluation of promoted Ni‐based catalysts for thermocatalytic decomposition of methane. ChemistrySelect, 5 (37). pp. 11471-11482. ISSN 2365-6549

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Abstract

Thermocatalyatic decomposition (TCD) of methane to COX free hydrogen and carbon nanofibre (CNF) was investigated over a series of self‐designed monometallic Ni catalyst and bimetallic Ni−Cu and Ni−Pd catalysts. The catalysts were synthesised from the wet impregnation method and characterised using a series of complementary techniques include TGA, XRD, BET, TPR, FESEM, TEM, and Raman Spectroscopy. Despite a substantial reduction of surface area in the promoted catalysts, the catalytic activity of the promoted catalyst was enhanced due to the nature of the process which is a metal‐catalysed reaction. As a whole, bimetallic Pd−Ni catalyst with a surface area of 2.76 m2 g−1 possesed the highest conversion of 77 % after 6 h reaction. The overall TCD reaction was found to be first‐order with the calculated activation energy, Ea of 38 kJ mol−1. The methane consumption rates at 1023 K and 1073 K were 0.5 mol s−1gcat−1 and 0.58×104 mol s−1gcat−1 respectively. Meanwhile, the methane consumption rates improved considerably from 0.58 mol s−1gcat−1 to 0.67×104 mol s−1gcat−1 under the methane partial pressure of 41 kPa. The XRD profile of the fresh catalysts revealed that mixed oxides were formed over the surface of the support upon the addition of Cu and Pd to 50 %Ni/Al2O3. Moreover, the formation of carbon nanofibers followed both tip and base growth mechanisms as evident from the TEM images. Larger and wider carbon fibres were found in the Pd promoted catalyst.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Activation energy; Alloy; Carbon; CNF; Reaction order; TCD
Subjects: T Technology > TP Chemical technology
Faculty/Division: Centre of Excellence: Centre of Excellence for Advanced Research in Fluid Flow
Faculty of Chemical and Process Engineering Technology
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 28 Apr 2021 05:06
Last Modified: 28 Apr 2021 05:06
URI: http://umpir.ump.edu.my/id/eprint/31065
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