Synthesis-Gas Production from Methane over Ni/CeO2 Catalysts Synthesized by Co-Precipitation Method in Different Solvents

Asencios, Yvan J.O.; Elias, Kariny Ferreira Monteiro; Zawadzki, Andressa de; Assaf, Elisabete Moreira

doi:10.3390/methane1020007

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Industry uses Nickel-based catalysts for SRM, but they are suffering from carbon deposition (coking), which can lead to catalyst deactivation, and/or to an increase of reactor pressure (highly dangerous clogging [ 3 – 7 ]). Different ways have been suggested to minimize carbon deposition, including using solid solutions as catalyst supports (mixed oxides [ 3 ]), decreasing the crystallite size of the metal particles [ 8 , 9 ], using metal alloys [ 10 , 11 ], adding promoters, etc.…”

Section: Introductionmentioning

confidence: 99%

Partial Oxidation of Bio-methane over Nickel Supported on MgO–ZrO2 Solid Solutions

Asencios,

Yigit,

Wicht

et al. 2023

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Syngas can be produced from biomethane via Partial Oxidation of Methane (POM), being an attractive route since it is ecofriendly and sustainable. In this work, catalysts of Ni supported on MgO–ZrO2 solid solutions, prepared by a one-step polymerization method, were characterized by HRTEM/EDX, XRD, XPS, H2-TPR, and in situ XRD. All catalysts, including Ni/ZrO2 and Ni/MgO as reference, were tested for POM (CH4:O2 molar ratio 2, 750 ºC, 1 atm). NiO/MgO/ZrO2 contained two solid-solutions, MgO–ZrO2 and NiO-MgO, as revealed by XRD and XPS. Ni (30 wt%) supported on MgO–ZrO2 solid solution exhibited high methane conversion and hydrogen selectivity. However, depending on the MgO amount (0, 4, 20, 40, 100 molar percent) major differences in NiO reducibility, growth of Ni0 crystallite size during H2 reduction and POM, and in carbon deposition rates were observed. Interestingly, catalysts with lower MgO content achieved the highest CH4 conversion (~ 95%), high selectivity to H2 (1.7) and CO (0.8), and low carbon deposition rates (0.024 g carbon.gcat−1 h−1) with Ni4MgZr (4 mol% MgO) turning out to be the best catalyst. In situ XRD during POM indicated metallic Ni nanoparticles (average crystallite size of 31 nm), supported by MgO–ZrO2 solid solution, with small amounts of NiO–MgO being present as well. The presence of MgO also influenced the morphology of the carbon deposits, leading to filaments instead of amorphous carbon. A combustion-reforming mechanism is suggested and using a MgO–ZrO2 solid solution support strongly improves catalytic performance, which is attributed to effective O2, CO2 and H2O activation at the Ni/MgO–ZrO2 interface.

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Section: Introductionmentioning

confidence: 99%

Partial Oxidation of Bio-methane over Nickel Supported on MgO–ZrO2 Solid Solutions

Asencios,

Yigit,

Wicht

et al. 2023

Top Catal

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Polyoxometalates for carbon dioxide activation: Current progress and perspective

Ahsan,

Saeed,

Ahmad

et al. 2024

J Chinese Chemical Soc

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The elevated level of carbon dioxide (CO2) in the troposphere is playing a crucial role in changing the earth's climatic system. Excess CO2 concentration is trapping a substantial proportion of heat imparting adverse range of environmental effects like extreme weather events, agricultural impacts and disruption of the ecosystem. Strategies such as CO2 capturing and storage are being pursued using polyoxometalates (POMs) to mitigate the elevated level of CO2 and their efficient conversion into useful chemicals. This review outlines the importance of CO2 reduction by electrocatalytic and photocatalytic reduction of CO2. POMs have several advantages for CO2 activation because of their promising catalytic activity, high selectivity and versatility for incorporating different metal ions and ligands. The efficient redox active metal center facilitates the conversion of CO2 by providing sufficient activation energy. Their robust structure also enables them resist harsh conditions, including high temperature and acidic or basic conditions. Owing to these properties, POMs can be a catalyst, co‐catalyst, photosensitizer or multielectron donor for CO2 reduction. Finally, we stated the challenges and future insight for CO2 activation using POMs.

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Advances in Microfluidic Synthesis of Solid Catalysts

Chen

Dong

Yue

2022

Powders

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Heterogeneous catalysis plays a central role in the chemical and energy fields, owing to the high and tunable activities of solid catalysts that are essential to achieve the favorable reaction process efficiency, and their ease of recycle and reuse. Numerous research efforts have been focused on the synthesis of solid catalysts towards obtaining the desired structure, property and catalytic performance. The emergence and development of microfluidic reactor technology provide a new and attractive platform for the controllable synthesis of solid catalysts, primarily because of its superior mixing performance and high heat/mass transfer efficiency. In this review, the recent research progress on the synthesis of solid catalysts based on microfluidic reactor technology is summarized. The first section deals with the synthesis strategies for solid catalysts, including conventional methods in batch reactors and microfluidic alternatives (based on single- and two-phase flow processing). Then, different kinds of solid catalysts synthesized in microflow are discussed, especially with regard to the catalyst type, synthetic process, structure and property, and catalytic performance. Finally, challenges in the microreactor operation and scale-up, as well as future perspectives in terms of the synthesis of more types of catalysts, catalyst performance improvement, and the combination of catalyst synthesis process and catalytic reaction in microreactors, are provided.

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Synthesis-Gas Production from Methane over Ni/CeO2 Catalysts Synthesized by Co-Precipitation Method in Different Solvents

Cited by 3 publications

References 22 publications

Partial Oxidation of Bio-methane over Nickel Supported on MgO–ZrO2 Solid Solutions

Partial Oxidation of Bio-methane over Nickel Supported on MgO–ZrO2 Solid Solutions

Polyoxometalates for carbon dioxide activation: Current progress and perspective

Advances in Microfluidic Synthesis of Solid Catalysts

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