Effect of Mo Addition on the Performance of Ni-Based Methanation Catalysts Supported by Halloysites

Xu, Bowen; Meng, Xin; Xin, Zhong; Jin, Daoming; Zhao, Rui; Dai, Wenhua; Xu, Fan; Yang, Dandan

doi:10.1021/acs.iecr.3c00941

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…The two additional peaks observed at 740 and 839 °C can be ascribed to the reduction of MoO x . Note that the overlap of the new reduction peak appeared at approximately 465 °C, which was likely because of the strong interaction between Mo and Mn within the catalyst that caused part of MoO 3 to have similar reduction temperatures with MnO x . − …”

Section: Resultsmentioning

confidence: 99%

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

Zhang,

et al. 2024

Ind. Eng. Chem. Res.

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MnO x and MoO x , as additives, have proved effective in enhancing the NH 3 selective catalytic reduction activity of catalysts. In this study, a new Mn−Fe−Mo catalyst was prepared using both the precipitation method and impregnation method. The redox properties, surface acidity, and reaction intermediates of the prepared catalysts were analyzed using various techniques. The test results showed that the MFMo 4 catalyst achieved a NO x conversion rate exceeding 90% over the temperature range of 120−390 °C, demonstrating high potential to replace V-based catalysts due to outstanding activity at both high and low temperatures. The addition of MoO x exerted a detrimental impact on the redox property and avoided the production of N 2 O, thereby enhancing the N 2 selectivity. Furthermore, the codoping of MnO x and MoO x inhibited the adsorption of NO x on the catalysts while resulting in an increased number of Lewis acid sites on the catalyst. This promoted its reaction via the Eley−Rideal mechanism, which played a crucial role in ensuring the catalyst had excellent SCR activity over a wide temperature range.

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Section: Resultsmentioning

confidence: 99%

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

Zhang,

et al. 2024

Ind. Eng. Chem. Res.

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Effects of molybdenum addition to activated carbon supported Ni‐based catalysts for CO₂ methanation

Akpasi,

Isa,

Mahlangu

et al. 2023

Greenhouse Gases

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Recently, CO2 methanation has become a technique that aims to reduce anthropogenic CO2 emissions by converting CO2 captured from stationary and mobile sources and H2 produced from renewable sources into CH4. Due to their excellent performance‐to‐cost ratio, Ni‐based catalysts were frequently used in such conversions. The main drawbacks, however, are that Ni has the propensity to aggregate and deposit carbon during the high‐temperature reaction. These issues can be partially resolved by including a support (e.g., MOF, zeolite, activated carbon, etc.) and a second transition metal (e.g., Mo, Co, or Fe) in Ni‐based catalysts. Therefore, the activity of Ni‐based catalysts at low temperatures needs to be improved. In this study, a series of mesoporous activated carbon (AC) supported bimetallic Ni–Mo catalysts (Ni–xMo/AC, Ni = 13 wt.%, x = 5, 7, 9, 11 wt.%) were synthesized using the incipient wetness impregnation method. The effect of Mo content on the catalyst's activity was examined in a fixed‐bed reactor. At 250–650°C, 1‐atmosphere pressure, gas hourly space velocity (GHSV): 1200 mL h−1 g−1, and H2/CO2 ratio: 4:1, the catalytic efficiency of these catalysts was examined. The catalysts were analyzed using transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), X‐ray powder diffraction (XRD), N2‐physisorption, and scanning electron microscopy/energy dispersive X‐ray spectroscopy (SEM‐EDX). Ni–7%Mo/AC catalyst showed the lowest carbon deposition rate, superior stability, and the best activity. The addition of Mo can improve the heat resistance of the Ni/AC catalyst and the interaction between the metal nickel and the support, which prevents the sintering of the catalyst. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Achieving Sulfur Tolerance in CO₂ Methanation over Ni-Based Catalysts: Protective Effects of Fe

Xu,

Wang,

Shen

et al. 2024

Energy Fuels

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Direct methanation of carbon dioxide (CO 2 ) in coal-fired flue gas presents a promising approach for achieving carbon neutrality without the energy-intensive CO 2 capture process. However, traditional Ni-based catalysts are easily deactivated by sulfur poisoning. In this study, a sulfur-tolerant Ni/γ-Al 2 O 3 catalyst with Fe modification (xFe−Ni/A) was developed, and the promoting mechanisms were elucidated. Experimental results showed that the 1Fe−Ni/A catalyst exhibited optimal Fe loading and maintained good activity in the presence of SO 2 . It was revealed that Fe addition facilitated the formation of the Ni−Fe alloy and modulated the catalyst's surface chemistry, thereby promoting the reaction activity. Furthermore, the physicochemical and SO 2 adsorption properties of the catalyst suggested that Fe not only functioned as a protective agent for Ni sites against SO 2 but also inhibited overall SO 2 adsorption, resulting in enhanced sulfur resistance. This study provides valuable guidance for the design of sulfur-tolerant catalysts by doping sacrificial sites and modulating SO 2 adsorption using non-noble metals, laying the foundation for the scale-up industrial applications of CO 2 utilization in the SO 2 -containing environment.

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Effect of Mo Addition on the Performance of Ni-Based Methanation Catalysts Supported by Halloysites

Cited by 3 publications

References 39 publications

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

Effects of molybdenum addition to activated carbon supported Ni‐based catalysts for CO₂ methanation

Achieving Sulfur Tolerance in CO₂ Methanation over Ni-Based Catalysts: Protective Effects of Fe

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Effect of Mo Addition on the Performance of Ni-Based Methanation Catalysts Supported by Halloysites

Cited by 3 publications

References 39 publications

A Novel MnOx–MoOx Codoped Iron-Based Catalyst for NH3-SCR with Superior Catalytic Activity over a Wide Temperature Range

A Novel MnOx–MoOx Codoped Iron-Based Catalyst for NH3-SCR with Superior Catalytic Activity over a Wide Temperature Range

Effects of molybdenum addition to activated carbon supported Ni‐based catalysts for CO2 methanation

Achieving Sulfur Tolerance in CO2 Methanation over Ni-Based Catalysts: Protective Effects of Fe

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A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

Effects of molybdenum addition to activated carbon supported Ni‐based catalysts for CO₂ methanation

Achieving Sulfur Tolerance in CO₂ Methanation over Ni-Based Catalysts: Protective Effects of Fe