Tailoring Ni + Sr-MgO Catalysts for Efficient Dry Reforming of Methane: A Performance Study

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-02-26 DOI:10.1007/s10562-025-04966-1

Abdulaziz Bentalib, Dalia A. Ali, Maher M. Alrashed, Ahmed A. Ibrahim, Alaaddin M. M. Saeed, Anis H. Fakeeha, Ahmed E. Abasaeed, Rawesh Kumar, Ahmed S. Al-Fatesh

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Abstract

This research paper examines the performance of strontium (Sr) promoted nickel (Ni) catalysts supported on magnesium oxide (MgO) in the dry reforming of methane (DRM) into syngas. The characterization of these catalysts is carried out using a range of analytical techniques, including measurements of surface area and porosity, thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H₂-TPR), temperature-programmed oxidation (TPO) and desorption (TPD) studies. The concentration of active sites, as well as the presence of acid and basic sites on the catalyst surface, are the primary factors influencing the catalytic activity of the 5Ni + xSr-MgO catalysts (where x = 1, 2, 3, and 4 wt%). Ni, supported over MgO, has few active sites and lacks a strong basic site, which results in minimum catalytic activity. Adding 1–4 wt% Sr over 5Ni-MgO induces the formation of higher concentrations of active sites and an increased population of strong basic sites. At 3 wt% Sr loading, concentration of active sits, strong basic sites, and strong acid sites are optimum which can activate CH₄ and CO₂ timely for DRM rather than coke deposition. So, 5Ni + 3Sr-MgO achieved 58.4% CH₄ conversion (with H₂/CO ratio 1.1) at 700 ^°C and ~ 82% CH₄ conversion at 750 ^°C. This study offers insights for turning a cheap catalyst system (5Ni-MgO) into a high-performance catalyst by optimum loading of Sr promotor.

Graphical abstract

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用于甲烷高效干重整的定制Ni + Sr-MgO催化剂的性能研究

研究了氧化镁（MgO）负载的锶（Sr）促进镍（Ni）催化剂在甲烷（DRM）干重整制合成气中的性能。这些催化剂的表征是使用一系列分析技术进行的，包括表面积和孔隙度的测量、热重分析（TGA）、x射线衍射（XRD）、透射电子显微镜（TEM）、氢程序升温还原（H2-TPR）、程序升温氧化（TPO）和解吸（TPD）研究。活性位点的浓度以及催化剂表面酸碱位点的存在是影响5Ni + xSr-MgO催化剂催化活性的主要因素（其中x = 1,2,3和4wt %）。在MgO上负载的Ni具有很少的活性位点，并且缺乏强碱性位点，导致催化活性最低。在5Ni-MgO中加入1-4 wt%的Sr可诱导活性位点的形成，并增加强碱性位点的数量。当Sr载荷为3wt %时，活性位点、强碱位点和强酸位点的浓度是最佳的，它们能及时激活CH4和CO2，而不是沉积焦炭。因此，5Ni + 3Sr-MgO在700℃时CH4转化率为58.4% (H2/CO比为1.1)，750℃时CH4转化率为~ 82%。本研究为通过优化加载Sr促进剂，将廉价的5Ni-MgO催化剂体系转变为高性能催化剂提供了新的思路。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.