Catalytic performance of Pd catalyst supported on Zr:Ce modified mesoporous silica for methane oxidation

Khan, Hassnain Abbas; Hao, Junyu; Farooq, Aamir

doi:10.1016/j.cej.2020.125489

Cited by 32 publications

(18 citation statements)

References 48 publications

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“…11 One of the keys of the catalytic combustion methods is the development of highly efficient, easily available, and inexpensive catalysts, a research endeavor that has attracted the attention of many research-ers. 12 Numerous catalysts for catalytic combustion of methane have been proposed and reported. 13−18 Among the series of catalysts for the elimination of volatile organic chemicals, 19−24 noble metal-supported catalysts have received tremendous attention because of their excellent catalytic activities and high reaction rates in methane combustion, 1 8 , 2 5 , 2 6 especially for Pd-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

Ogunbiyi

et al. 2021

ACS Appl. Nano Mater.

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NiO nanomaterials prepared using a solid−liquid NH 3 • H 2 O precipitation method (NiO-NSL) were tested in the catalytic combustion of methane. The NiO-NSL presented a characteristic rodlike nanostructure with a length of about a few hundred nanometers except for a part of the nanoparticles. For comparison, the NiO nanomaterials prepared by the traditional liquid-phase NH 3 •H 2 O precipitation method (NiO-NLL) were tested in the same reaction conditions. NiO-NSL exhibited significantly higher methane combustion activity than NiO-NLL and achieved the complete combustion of methane at 390 °C, which was outstanding in non-noble metal-based catalyst. X-ray photoelectron spectroscopy (XPS) and hydrogentemperature-programmed reduction (H 2 -TPR) results indicate that the surface Ni 2+ content of NiO-NSL was higher than that of NiO-NLL, and the presence of more Ni 2+ might be responsible for the enhanced activity. DFT calculations prove that the energy barrier for C−H bond activation on Ni 2+ was lower than that on Ni 3+ , which was consistent with the higher methane catalytic combustion activity of NiO-NSL. In addition, when the precipitating agent was replaced with NaOH and (NH 4 ) 2 CO 3 , the generalization of the solid−liquid precipitation method in the preparation of the NiO catalysts was also tested. The results show that the solid−liquid precipitation method proposed in this work was still applicable when NaOH was used as a precipitant. However, with the use of (NH 4 ) 2 CO 3 as a precipitant, the methane catalytic activity of the NiO nanoparticles prepared by the solid−liquid precipitation method was reduced to a certain extent compared with the traditional liquid-phase precipitation method. This research can open up a highly efficient and environmentally friendly method for the synthesis of methane combustion catalysts.

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Section: Introductionmentioning

confidence: 99%

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

Ogunbiyi

et al. 2021

ACS Appl. Nano Mater.

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“…The pore volume of the prepared catalyst is 0.52 cm 3 /g. It is believed that larger pore volumes tend to help store more reactants, and interconnected porous networks facilitate the transportation of reactant molecules and products, resulting in higher reaction rates (Khan et al, 2020).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Evolved Gas Analysis and Kinetics of Catalytic and Non-Catalytic Pyrolysis of Microalgae Chlorella sp. Biomass With Ni/θ-Al2O3 Catalyst via Thermogravimetric Analysis

et al. 2021

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This study investigates the efficacy of a prepared Ni/θ-Al2O3 catalyst during the pyrolytic conversion of Parachlorella kessleri HY-6 and compares the results with non-catalytic conversion. The catalyst was characterized by techniques such as Brunauer–Emmett–Teller (BET) for surface area, acidity, and X-ray powder diffraction (XRD). Isoconversional and combined kinetic methods were used to study the pyrolytic kinetics of the process. Ni/θ-Al2O3 was used at 10, 20, and 30% of the algal biomass. The addition of Ni/θ-Al2O3 facilitated the conversion by lowering the mean activation energy during pyrolysis. The catalytic effect was more pronounced at lower and higher conversions. The presence of the catalyst facilitated the pyrolysis as indicated by the lower value of activation energy and ∆H, and ∆G. Gases evolved during pyrolysis were qualitatively analyzed by FTIR to see the effect of catalyst on evolved gas composition during the pyrolysis process.

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“…On the other hand, the methane global warming potential is 25−36 times more than that of CO 2 , and research studies have shown that more methane conversion to carbon dioxide could help reduce the burden on the environment. 3 Thus, the emission of unburned methane must be minimized. Furthermore, due to the high temperature of the methane combustion reaction (above 1000 °C), some pollutants such as NO x , CO x , and unburned hydrocarbons may also be released.…”

Section: Introductionmentioning

confidence: 99%

“…The burning of methane increases the emission of greenhouse gases in the atmosphere, and therefore, it can change the global climate. On the other hand, the methane global warming potential is 25–36 times more than that of CO 2 , and research studies have shown that more methane conversion to carbon dioxide could help reduce the burden on the environment . Thus, the emission of unburned methane must be minimized.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Methane Combustion on the Hydrothermally Synthesized MnO₂ Nanowire Catalysts

Akbari

Alavi

Rezaei

et al. 2021

Ind. Eng. Chem. Res.

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The various morphologies (wire, rod, tube, and flower) of the MnO x nanocrystalline catalysts were prepared using the hydrothermal and solution methods, and the prepared samples were evaluated for catalytic combustion of methane. The results revealed that the wire-like MnO2 catalyst showed an excellent performance in the methane combustion reaction. The light-off temperature related to 90% of the CH4 conversion was about 400 °C for the wire-like sample, which was higher than those obtained in other catalysts with different morphologies. The influence of the different synthesis factors including the hydrothermal temperature, pH value, aging time, and calcination temperature on the textural properties and activity of the catalysts was investigated. The obtained results confirmed that varying the preparation factors had a considerable effect on the structure and activity of the catalysts. The sample synthesized under the specific conditions (T hydro. = 240 °C, pH = 3, aging time = 24 h, and T cal. = 400 °C) displayed the highest efficiency in the methane catalytic combustion process. Furthermore, the effect of various operating parameters including the gas hourly space velocity, feed (O2/CH4) ratio, pretreatment condition, type of solvents, and catalytic stability in the existence of CO2 and steam was studied on the catalytic performance. The results revealed that the catalyst stability of the optimal MnO2 sample reduced to some extent with the concurrent concentration of CO2 and water vapor in the reactant feed stream. In the presence of CO2 or/and H2O, the initial CH4 activity at 350 °C was below 20%. However, the long-term stability showed high stability under the dry feed at 450 °C for 50 h.

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Catalytic performance of Pd catalyst supported on Zr:Ce modified mesoporous silica for methane oxidation

Cited by 32 publications

References 48 publications

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

Evolved Gas Analysis and Kinetics of Catalytic and Non-Catalytic Pyrolysis of Microalgae Chlorella sp. Biomass With Ni/θ-Al2O3 Catalyst via Thermogravimetric Analysis

Catalytic Methane Combustion on the Hydrothermally Synthesized MnO₂ Nanowire Catalysts

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Catalytic performance of Pd catalyst supported on Zr:Ce modified mesoporous silica for methane oxidation

Cited by 32 publications

References 48 publications

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

Evolved Gas Analysis and Kinetics of Catalytic and Non-Catalytic Pyrolysis of Microalgae Chlorella sp. Biomass With Ni/θ-Al2O3 Catalyst via Thermogravimetric Analysis

Catalytic Methane Combustion on the Hydrothermally Synthesized MnO2 Nanowire Catalysts

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Catalytic Methane Combustion on the Hydrothermally Synthesized MnO₂ Nanowire Catalysts