Core-shell PdO@SiO2/Al2O3 with sinter-resistance and water-tolerance promoting catalytic methane combustion

Zou, Xuelin; Ma, Zilin; Deng, Jiale; Zhong, Jiajin; He, Yurong; Liu, Jian

doi:10.1016/j.cej.2020.125275

Cited by 28 publications

(12 citation statements)

References 43 publications

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“…The XPS peak-fitting results reveal that the content of Pd 0 on the PdO/AlPO 4 -5 catalyst surface was increased after the reaction, indicating that part of Pd 2+ was reduced to Pd 0 . The consumption of lattice oxygen is involved in the oxidation reaction, which leads to the increase of oxygen vacancies on the surface and lattice of PdO. , In addition, the high chemical potential of HMF around the PdO site limits the reoxidation of Pd 0 to Pd 2+ .…”

Section: Discussionmentioning

confidence: 99%

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Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO₄-5 Catalyst under Mild Conditions

Chen

Wen

et al. 2021

Ind. Eng. Chem. Res.

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A solvent-free method was proposed to upgrade the biomass-derived compound 5-hydroxymethylfurfural (HMF). The oxidation of HMF to produce 2,5-furandicarboxylic acid (FDCA) has been examined in the presence of O 2 without the addition of solvent and base. Different from the conversion of the aldehyde group on HMF as the initial oxidation step in H 2 O solvent, the hydroxyl group on HMF was first oxidized and FDCA was finally generated without the addition of solvent. The role of O 2 is to replenish the consumption of active oxygen species on the catalyst surface. The oxidation of HMF to FDCA proceeded due to the solvent-free effect. A 83.6% FDCA selectivity at 38.8% HMF conversion was measured with a PdO/AlPO 4 -5 catalyst at 80 °C for 5 h and the reaction mechanism was proposed.

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Section: Discussionmentioning

confidence: 99%

“…The consumption of lattice oxygen is involved in the oxidation reaction, which leads to the increase of oxygen vacancies on the surface and lattice of PdO. 41,42 In addition, the high chemical potential of HMF around the PdO site limits the reoxidation of Pd 0 to Pd 2+ .…”

Section: ■ Discussionmentioning

confidence: 99%

Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO₄-5 Catalyst under Mild Conditions

Chen

Wen

et al. 2021

Ind. Eng. Chem. Res.

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“…Methane has been increasingly exploited as a substitute for conventional fossil fuels due to its abundant reserves and high economic benefits since the shale revolution. − The engines of vehicles using natural gas or liquefied petroleum gas usually perform combustions of methane at a relatively low temperature (<600 °C), and the greenhouse effect caused by the released unburned methane is on average 28 times more powerful than CO 2 . , As countries around the world promulgate more stringent emission legislation, it is urgent to find a method capable of lean methane combustion with high efficiency and low cost. ,− The catalytic combustion of methane is considered to be a methane treatment method with great potential, which can efficiently convert methane into harmless water and CO 2 at a lower temperature in the presence of a suitable catalyst, while suppressing the production of harmful air pollutants (such as NO x , CO, and SO x ). ,,− …”

Section: Introductionmentioning

confidence: 99%

“…Noble metal (Pd, Pt, Ru, Rh, Au, etc. )-supported catalysts are generally used for CH 4 elimination and Pd-supported catalysts have been reported to be highly active ,− ,,− mainly because of their ability to break the C–H bond with high binding energy in CH 4 under a relatively low energy barrier. ,,,,− Although noble metal-supported catalysts have high efficiency, their high price, limited source, sintering issue, and poisoning tendency limit their large-scale application. ,,,, Accordingly, the development of alternative catalysts based on non-noble metals is attractive, and single metal oxide-based catalysts such as MnO x , Co 3 O 4 , CuO, Fe 2 O 3 , NiO, and perovskite have been found to be highly active for methane combustion. ,,,− NiO, a p-type semiconductor, is of particular interest because of its unique chemical properties, high thermal stability, and low prices. − Recently, NiO nanomaterials with different morphologies, such as nanosheets, ,,,− nanoparticles, ,− nanorods, , and honeycomb-like nanostructures, have been reported successively and applied as catalysts, battery electrodes, and capacitors . However, there are not many reports about the application of NiO catalysts in methane catalytic combustion.…”

Section: Introductionmentioning

confidence: 99%

Nickel Hydroxide Nanosheets Prepared by a Direct Manual Grinding Strategy for High-Efficiency Catalytic Combustion of Methane

Guo

Zhu

et al. 2022

ACS Omega

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Nickel hydroxide nanosheets were prepared by a very simple direct manual grinding strategy and then calcined at 200, 300, 400, and 500°. The synthesized samples were tested in lean methane (1.0% CH 4 , air balanced) catalytic combustion and subjected to a series of physical and chemical characterizations. The sample calcined at 200 °C (Ni(OH) 2 -200) presented a typical nanosheet structure and the best methane catalytic activity in all the samples, which can completely catalyze methane at 400 °C. The crystal structure changed from β-Ni(OH) 2 to NiO at a calcination temperature of 300 °C. The β-Ni(OH) 2 nanosheets began to partially agglomerate into nanoparticles at 400 °C and almost transformed into nanoparticles at 500 °C. Interestingly, the original nanosheet samples Ni(OH) 2 -200 and NiO-300 still maintained their morphology and structure although they all went through an activity test at 500 °C in a 1.0% CH 4 atmosphere, which proves that the calcination of nanosheets in a CH 4 atmosphere tended to maintain their nanosheet morphology compared with calcination in the air. Furthermore, through the activity test, X-ray photoelectron spectroscopy results, TPx, and in situ DRIFTS characterization, it was proved that the hydroxyl groups on the Ni(OH) 2 -200 and NiO nanosheets were beneficial to the dissociation of methane on the catalyst surface, and the nanosheet structure was also prone to generating more active adsorbed oxygen, so the activation energy of methane was lowered. A methane catalytic mechanism on the Ni(OH) 2 nanosheets and NiO nanoparticles was proposed, which further proved the key role of hydroxyl groups in methane combustion.

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“…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 researchers . Numerous catalysts for catalytic combustion of methane have been proposed and reported. − …”

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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Core-shell PdO@SiO2/Al2O3 with sinter-resistance and water-tolerance promoting catalytic methane combustion

Cited by 28 publications

References 43 publications

Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO₄-5 Catalyst under Mild Conditions

Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO₄-5 Catalyst under Mild Conditions

Nickel Hydroxide Nanosheets Prepared by a Direct Manual Grinding Strategy for High-Efficiency Catalytic Combustion of Methane

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

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Core-shell PdO@SiO2/Al2O3 with sinter-resistance and water-tolerance promoting catalytic methane combustion

Cited by 28 publications

References 43 publications

Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO4-5 Catalyst under Mild Conditions

Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO4-5 Catalyst under Mild Conditions

Nickel Hydroxide Nanosheets Prepared by a Direct Manual Grinding Strategy for High-Efficiency Catalytic Combustion of Methane

Irregularly Shaped NiO Nanostructures for Catalytic Lean Methane Combustion

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Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO₄-5 Catalyst under Mild Conditions

Solvent- and Base-Free Oxidation of 5-Hydroxymethylfurfural over a PdO/AlPO₄-5 Catalyst under Mild Conditions