The promoting effect of magnesium on NiMgLaZr catalysts for biogas upgrading to syngas via a tri-reforming process

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2025-02-01 DOI:10.1016/j.biombioe.2024.107588

Santiago Veiga , Mariano Romero , Darío Segobia , Carlos Apesteguía , Juan Bussi

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Abstract

The effect of partial substitution of lanthanum by magnesium on the catalytic activity of the Ni-La₂Zr₂O₇ catalyst in the biogas tri-reforming reaction was studied. Four catalysts, Ni-La_2-xMg_xZr₂O_7-δ (x = 0.25, 0.5, 0.75, and 1), were prepared using a modified polymeric precursor method, characterized using several techniques, and evaluated at 800 °C with a sub-stoichiometric molar feed composition of CH₄/CO₂/H₂O/O₂ = 1/0.33/0.33/0.08. The catalyst with x = 0.5 showed the best performance, which is attributed to its optimum properties of nickel particle size, metal-support interactions, and basicity. A stability test was performed with this catalyst using a molar feed composition of CH₄/CO₂/H₂O/O₂ = 1/0.33/0.67/0.08, previously optimized to obtain a synthesis gas with a H₂/CO ≈ 2 molar ratio for 100 h, and compared with a commercial steam reforming catalyst. The catalyst with x = 0.5 exhibited higher CH₄ and CO₂ conversions, a lower amount of carbon deposited, and a lower degree of nickel particle sintering.

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镁对NiMgLaZr催化剂沼气三重整制合成气的促进作用

研究了镁部分取代镧对Ni-La2Zr2O7催化剂在沼气三重整反应中催化活性的影响。采用改进的聚合物前驱体法制备了Ni-La2-xMgxZr2O7-δ （x = 0.25、0.5、0.75和1）四种催化剂，采用多种技术对其进行了表征，并在800℃下以亚化学计量摩尔进料组成CH4/CO2/H2O/O2 = 1/0.33/0.33/0.08进行了评价。当x = 0.5时，催化剂的性能最好，这主要归因于其镍粒度、金属-载体相互作用和碱度的最佳性能。采用CH4/CO2/H2O/O2 = 1/0.33/0.67/0.08的摩尔进料组成对该催化剂进行了稳定性测试，优化后的合成气体H2/CO≈2摩尔比为100 h，并与工业蒸汽重整催化剂进行了比较。x = 0.5的催化剂具有较高的CH4和CO2转化率，较低的碳沉积量和较低的镍颗粒烧结程度。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.