Methane combustion over palladium catalyst within the confined space of MFI zeolite

Gao, Mingyang; Gong, Zhongmiao; Weng, Xuefei; Shang, Weixiang; Chai, Yuchao; Dai, Weili; Wu, Guangjun; Guan, Naijia; Li, Landong

doi:10.1016/s1872-2067(20)63775-5

Cited by 50 publications

(21 citation statements)

References 49 publications

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“… Haldeman and Emmett (1956) studied that most of the active sites of silica–alumina are Lewis acids rather than Bronsted acids for the exchange of H 2 O at a higher temperature, indicating that Lewis acids could be good for forming OH groups. To evaluate the amount of Lewis acid sites, NH 3 -TPD were chosen to measure the medium acid sites at 100–400°C (Lewis acid sites) ( Gao et al, 2021 ), as shown in Supplementary Figure S1 .…”

Section: Resultsmentioning

confidence: 99%

“…The catalytic oxidation of CH 4 has been widely investigated ( Li et al, 2020 ; Jang et al, 2021 ; He et al, 2019 ). So far, researchers in this field have utilized a broad range of catalysts, including those based on noble metals (Pt and Pd) ( Gao et al, 2021 ; Jang et al, 2021 ), transition metal oxides ( Singh et al, 2020 ), and perovskite- and spinel-type materials ( Lim et al, 2017a ; Chu et al, 2022 ). Pd is thought to be a promising active ingredient in the oxidation of CH 4 ( Ding et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Influence of carrier effect on Pd/Al2O3 for methane complete catalytic oxidation

Peng

Ma²,

Ma³

et al. 2022

Front. Chem.

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Pd/Al2O3 catalysts modified by different chemical elements (Mg, Si, Ce, and Zr) were tested for methane (CH4) catalytic combustion, and PdO nanoparticles loaded on modified Al2O3 were systematically studied. These conditions assess the carrier effects of Pd/Al2O3 and acid strength influences on CH4 combustion. We observed carrier effects on activation energy through tuning Pd 3d binding energies (BEs) and on pre-exponential factors (A) through Pd dispersion and acidity on supports. When the BE of Pd 3d5/2 is 337.3 eV, PdO nanoparticles loaded on modified Al2O3 have excellent activity in cracking the C−H bond of CH4, which leads to the lowest activation energy (Ea), regardless of the size effect of the PdO nanoparticle. Furthermore, a theoretical construction that acid sites on catalysts promote the reversible elementary step (2Pd−OH ↔ Pd−O* + Pd* + H2O) right shifts improving the A dependency on the quantity of exposed Pd* and Pd−O*. As a result, Al2O3, as the carrier, not only modifies the electronic characteristics and size of supported PdO nanoparticles but also participates in the reaction process via acid sites on the surface of Al2O3.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of carrier effect on Pd/Al2O3 for methane complete catalytic oxidation

Peng

Ma²,

Ma³

et al. 2022

Front. Chem.

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“…As shown in Figure 8b , the apparent activation energy value for Pd@HZSM5 was 70.7 kJ mol −1 , significantly lower than that for Pd/HZSM5 (91.4 kJ mol −1 ) and Pd@NaZSM5 (112.4 kJ mol −1 ). [ 186 ] It is evident that the existence of Brønsted acid sites assisted CH 4 activation over Pd sites and lowered the energy barrier. The collaboration among Pd sites and adjacent Brønsted acid sites could be suggested for CH 4 activation.…”

Section: Thermocatalytic Activation Of Methanementioning

confidence: 99%

“…[ 34 , 186 , 187 ] However, excess water vapor induced the reversible deactivation of Pd@H‐ZSM‐5 due to the poisoning of Brønsted acid sites by water vapor. [ 186 ] Meanwhile, previous research has demonstrated that the activity of Pd/Na‐zeolites is favorably related to the Na/Pd ratio. It was shown that in the case of mordenite with a Si/Al ratio of 51, the traditional ion exchange technique resulted in just 46% cation exchange.…”

Section: Thermocatalytic Activation Of Methanementioning

confidence: 99%

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Current Progress on Methods and Technologies for Catalytic Methane Activation at Low Temperatures

et al. 2022

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Methane (CH 4 ) is an attractive energy source and important greenhouse gas. Therefore, from the economic and environmental point of view, scientists are working hard to activate and convert CH 4 into various products or less harmful gas at low-temperature. Although the inert nature of C-H bonds requires high dissociation energy at high temperatures, the efforts of researchers have demonstrated the feasibility of catalysts to activate CH 4 at low temperatures. In this review, the efficient catalysts designed to reduce the CH 4 oxidation temperature and improve conversion efficiencies are described. First, noble metals and transition metal-based catalysts are summarized for activating CH 4 in temperatures ranging from 50 to 500 °C. After that, the partial oxidation of CH 4 at relatively low temperatures, including thermocatalysis in the liquid phase, photocatalysis, electrocatalysis, and nonthermal plasma technologies, is briefly discussed. Finally, the challenges and perspectives are presented to provide a systematic guideline for designing and synthesizing the highly efficient catalysts in the complete/partial oxidation of CH 4 at low temperatures.

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Investigation on the catalytic combustion of CO over LaMn_1‐xCu_xO₃ promoted by acid treatment

Zhou

2021

Asia-Pacific J Chem Eng

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There are large amounts of CO pollutants in the off-gas of the iron and steel industry, which cause serious harm to the environment and human health. To control the emission of CO more effectively, in this paper, LaMn 1-x Cu x O 3 (x = 0, 0.25) perovskite catalysts were prepared and then modified by dilute nitric acid. And the physicochemical properties and the catalytic activity of perovskite were investigated and analyzed. The activity results indicate that the Cu 2+ substitution and acid treatment could obviously promote the catalytic activity of catalysts for CO oxidation. Among the prepared samples, LaMn 0.75 Cu 0.25 O 3 -H exhibits the highest activity with 90% CO conversion at 176.5 C, and the self-sustained combustion of CO is successfully achieved. And the long-time stability test shows that LaMn 0.75 Cu 0.25 O 3 -H can keep 100% CO conversion, and the activity remains almost unchanged. Combined with the x-ray photoelectron spectroscopy (XPS) and H 2 temperature-programmed reduction (H 2 -TPR) results, the increased activity of LaMn 0.75 Cu 0.25 O 3 -H catalyst is mainly ascribed to the high concentration of Mn 4+ and abundant oxygen vacancies. On the other hand, the morphology of perovskite catalysts was remolded by acid etching, and the formation of the porous structure significantly increases the specific surface area. The above results show that the substitution of Cu and acid treatment for perovskite catalysts is a feasible strategy to improve CO catalytic combustion activity.

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Methane combustion over palladium catalyst within the confined space of MFI zeolite

Cited by 50 publications

References 49 publications

Influence of carrier effect on Pd/Al2O3 for methane complete catalytic oxidation

Influence of carrier effect on Pd/Al2O3 for methane complete catalytic oxidation

Current Progress on Methods and Technologies for Catalytic Methane Activation at Low Temperatures

Investigation on the catalytic combustion of CO over LaMn_1‐xCu_xO₃ promoted by acid treatment

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Methane combustion over palladium catalyst within the confined space of MFI zeolite

Cited by 50 publications

References 49 publications

Influence of carrier effect on Pd/Al2O3 for methane complete catalytic oxidation

Influence of carrier effect on Pd/Al2O3 for methane complete catalytic oxidation

Current Progress on Methods and Technologies for Catalytic Methane Activation at Low Temperatures

Investigation on the catalytic combustion of CO over LaMn1‐xCuxO3 promoted by acid treatment

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Investigation on the catalytic combustion of CO over LaMn_1‐xCu_xO₃ promoted by acid treatment