Catalysis mechanism of Pd-promoted γ-alumina in the thermal decomposition of methane to hydrogen: A density functional theory study

Salam, Md. Abdus; Abdullah, Bawadi

doi:10.1016/j.matchemphys.2016.12.022

Cited by 25 publications

(23 citation statements)

References 27 publications

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“…The optimal support should exhibit favorable properties, such as chemical and mechanical resistance, and a high surface area to promote the enhanced dispersion of the active phase [31]. The acidity of the support improves the methane decomposition, and the catalysts become highly refractory and stable in sintering and coke formation because of the proper interaction between metals and supports [98]. Dou et al [99] validated the presence of active sites on a catalyst's surface significantly affects the reaction activity and reported that catalyst deactivation can be considered as a decrease in the number of active sites.…”

Section: Effect Of Supportmentioning

confidence: 99%

Recent developments in methane decomposition over heterogeneous catalysts: an overview

Hasnan

Timmiati

Lim

et al. 2020

Mater Renew Sustain Energy

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The production of hydrogen to be used as an alternative renewable energy has been widely explored. Among various methods for producing hydrogen from hydrocarbons, methane decomposition is suitable for generating hydrogen with zero greenhouse gas emissions. The use of high temperatures as a result of strong carbon and hydrogen (C–H) bonds may be reduced by utilizing a suitable catalyst with appropriate catalyst support. Catalysts based on transition metals are preferable in terms of their activeness, handling, and low cost in comparison with noble metals. Further development of catalysts in methane decomposition has been investigated. In this review, the recent progress on methane decomposition in terms of catalytic materials, preparation method, the physicochemical properties of the catalysts and their performance in methane decomposition were presented. The formation of carbon as part of the reaction was also discussed.Graphic abstract

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Section: Effect Of Supportmentioning

confidence: 99%

Recent developments in methane decomposition over heterogeneous catalysts: an overview

Hasnan

Timmiati

Lim

et al. 2020

Mater Renew Sustain Energy

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“…This method is known as an eco-friendly process, and it has been extensively studied by various researchers [24]. The main advantages of TCD include the greenhouse free H2 production that can be directly used in fuel cells and the production of CNF as a by-product [25]. The reaction proceeds as shown in Eqns.…”

Section: Thermo-catalytic Decomposition (Tcd) Of Ch4mentioning

confidence: 99%

Recent advances in cleaner hydrogen productions via thermo-catalytic decomposition of methane: Admixture with hydrocarbon

Muhammad

Awad

Saidur

et al. 2018

International Journal of Hydrogen Energy

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A continuous increase in the greenhouse gases concentration due to combustion of fossil fuels for energy generation in the recent decades has sparked interest among the researchers to find a quick solution to this problem. One viable solution is to use hydrogen as a clean and effective source of energy. In this paper, an extensive review has been made on the effectiveness of metallic catalyst in hydrocarbon reforming for COX free hydrogen production via different techniques. Among all metallic catalyst, Ni-based materials impregnated with various transition metals as promoters exhibited prolonged stability, high methane conversions, better thermal resistance and improved coke resistance. This review also assesses the effect of reaction temperature, gas hour space velocity and metal loading on the sustainability of thermocatalytic decomposition TCD of methane. The practice of co-feeding of methane with other hydrocarbons specifically ethylene, propylene, hydrogen sulphide, and ethanol are classified in this paper with the detailed overview of TCD reaction kinetics over an empirical model based on power law that has been presented. In 2 addition, it is also expected that the outlook of TCD of methane for green hydrogen production will provide researchers with an excellent platform to the future direction of the process over Nibased catalysts.

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“…Extensive studies have been conducted to improve the catalytic activity and durability of Ni-based catalysts under similar reaction conditions. [16,17] Due to the unique properties of Ni catalyst, a wide range of catalytic applications have been reported in the literature, such as hydrodeoxygenation, [18] methanation reaction, [19] and methane reforming reactions. [20,21] In TCD reaction, Ni has a high reactivity in facilitating methane decomposition at a temperature as low as 773 K. Besides, the catalytic activity of Ni-based catalysts was found to be improved significantly upon diluting Ni with other metals in forming bimetallic catalysts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterisation, and Performance Evaluation of Promoted Ni‐Based Catalysts for Thermocatalytic Decomposition of Methane

et al. 2020

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Thermocatalyatic decomposition (TCD) of methane to CO X free hydrogen and carbon nanofibre (CNF) was investigated over a series of self-designed monometallic Ni catalyst and bimetallic NiÀ Cu and NiÀ 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 PdÀ Ni catalyst with a surface area of 2.76 m 2 g À 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, E a of 38 kJ mol À 1. The methane consumption rates at 1023 K and 1073 K were 0.5 mol s À 1 g cat À 1 and 0.58 × 10 4 mol s À 1 g cat À 1 respectively. Meanwhile, the methane consumption rates improved considerably from 0.58 mol s À 1 g cat À 1 to 0.67 × 10 4 mol s À 1 g cat À 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/Al 2 O 3. 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.

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Catalysis mechanism of Pd-promoted γ-alumina in the thermal decomposition of methane to hydrogen: A density functional theory study

Cited by 25 publications

References 27 publications

Recent developments in methane decomposition over heterogeneous catalysts: an overview

Recent developments in methane decomposition over heterogeneous catalysts: an overview

Recent advances in cleaner hydrogen productions via thermo-catalytic decomposition of methane: Admixture with hydrocarbon

Synthesis, Characterisation, and Performance Evaluation of Promoted Ni‐Based Catalysts for Thermocatalytic Decomposition of Methane

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