Methane decomposition kinetics and reaction rate over Ni/SiO2 nanocatalyst produced through co-precipitation cum modified Stöber method

Ashik, U.P.M.; Daud, Wan Mohd Ashri Wan; Abbas, Hazzim F.

doi:10.1016/j.ijhydene.2016.09.025

Cited by 54 publications

(40 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the average reaction order of Mat‐2 was computed to be 1.05. The results are in good agreement with the values reported in the literature, where the reaction order over supported metallic and carbonaceous catalysts were typically reported to be unity and 0.5–1, respectively . It is believed that the actual mechanism of TCD reaction is quite complex and the true kinetic of each elementary step are still yet to be investigated.…”

Section: Resultssupporting

confidence: 90%

“…The results are in good agreement with the values reported in the literature, where the reaction order over supported metallic and carbonaceous catalysts were typically reported to be unity and 0.5-1, respectively. [56] It is believed that the actual mechanism of TCD reaction is quite complex and the true kinetic of each elementary step are still yet to be investigated. The general mechanism of TCD begins with the dissociation of methane, followed by desorption of hydrogen and the accumulation of carbon on the active sites.…”

Section: Methane Decomposition Kineticsmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Methane Decomposition Kineticsmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Table 5) [115]. Ashik et al [116] thoroughly studied the reaction mechanism of TCD over Ni/SiO2 nanocatalyst prepared by co-precipitation cum modified Stober method. The studies were made around the reaction temperature of 823−923 K and pressure of 21−81 kPa.…”

Section: Kinetics and Reaction Mechanism Of Tcdmentioning

confidence: 99%

“…The CH4 conversions increased with reaction temperature and partial pressures, but the catalyst was subjected to an early deactivation due to the formation of CNF resulted in high reaction rates at higher temperatures as shown in Fig 8. Copyright 2017 Elsevier [116] The authors reported that as the TCD of CH4 occurs in various steps and the reaction kinetics of each step is still under study, this makes the overall mechanism of TCD extremely complicated.…”

Section: Kinetics and Reaction Mechanism Of Tcdmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…In the case of metal catalysts, the carbon produced covers the active sites, causing the rapid deactivation of catalysts and, thus, shortening their lifetime. In addition to this, the sintering of particles occurs at high temperatures and contributes to the activity loss of metal catalysts [60,63,83,91,108,[139][140][141][142][143][144][145][146]. Carbon materials also deactivate faster at higher temperatures.…”

Section: Influence Of Operating Conditionsmentioning

confidence: 99%

Methane Pyrolysis for CO₂‐Free H₂ Production: A Green Process to Overcome Renewable Energies Unsteadiness

Sanchez‐Bastardo

Schlögl

Ruland

2020

Chemie Ingenieur Technik

136

View full text Add to dashboard Cite

The Carbon2Chem® project aims to convert exhaust gases from the steel industry into chemicals such as methanol to reduce CO2 emissions. Here, H2 is required for the conversion of CO2 into methanol. Although much effort is put to produce H2 from renewables, the use of fossil fuels, especially natural gas, seems to be fundamental in the short term. For this reason, the development of clean technologies for the processing of natural gas with a low environmental impact has become a topic of utmost importance. In this context, methane pyrolysis has received special attention to produce CO2‐free H2.

show abstract

Methane decomposition kinetics and reaction rate over Ni/SiO2 nanocatalyst produced through co-precipitation cum modified Stöber method

Cited by 54 publications

References 83 publications

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

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

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

Methane Pyrolysis for CO₂‐Free H₂ Production: A Green Process to Overcome Renewable Energies Unsteadiness

Contact Info

Product

Resources

About

Methane decomposition kinetics and reaction rate over Ni/SiO2 nanocatalyst produced through co-precipitation cum modified Stöber method

Cited by 54 publications

References 83 publications

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

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

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

Methane Pyrolysis for CO2‐Free H2 Production: A Green Process to Overcome Renewable Energies Unsteadiness

Contact Info

Product

Resources

About

Methane Pyrolysis for CO₂‐Free H₂ Production: A Green Process to Overcome Renewable Energies Unsteadiness