Effect of Ga-Promoted on Ni/Zr + Al2O3 Catalysts for Enhanced CO2 Reforming and Process Optimization

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-09-30 DOI:10.1007/s10562-024-04811-x

Ahmed S. Al-Fatesh, Ramakrishna Chava, Saba M. Alwan, Ahmed A. Ibrahim, Anis H. Fakeeha, Jehad K. Abu-Dahrieh, Ahmed Yagoub Elnour, Ahmed E. Abasaeed, Othman Al-Othman, Srinivas Appari

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Abstract

In this study, zirconia-modified alumina support (S) was used to investigate Ga-promoted Ni catalysts for dry reforming of methane (DRM). The catalysts (Ni + (0–3) wt% Ga/S) were prepared using the wet impregnation method and calcined at 700 °C for 3 h. The inclusion of Ga enhanced the surface area, basicity, and metal-support interaction of the Ni-Ga/S catalysts. Smaller Ni particles containing Ga were seen in the TEM. The most active and stable catalyst was Ni + 2.0 Ga/S, having a conversion of 35% CO₂ and 28% CH₄ at 600 °C and displaying less (17%) carbon deposition. Furthermore, the DRM process was optimized by a mathematical model. The model determined the optimal conditions as follows: temperature (800 °C), gas flow rate (GHSV—30,000 ml h⁻¹gcat⁻¹), and methane to carbon dioxide ratio (1:1). The model predicts CH₄ and CO₂ conversions of 76.76% and 82.0%, respectively, and an H₂/CO ratio of 1.02, compared to experimental results showing CH₄ conversion at 74.56%, CO₂ conversion at 83.25%, and an H₂/CO ratio of 1.01. The model demonstrates excellent agreement with the experimental observations, exhibiting less than 3% error.

Graphical Abstract

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镓促进 Ni/Zr + Al2O3 催化剂对增强二氧化碳转化和工艺优化的影响

本研究使用氧化锆改性氧化铝载体（S）研究了用于甲烷干转化（DRM）的镓促进镍催化剂。催化剂（Ni + (0-3) wt% Ga/S）采用湿浸渍法制备，并在 700 °C 煅烧 3 小时。在 TEM 中可以看到含有 Ga 的较小 Ni 颗粒。活性最高、最稳定的催化剂是 Ni + 2.0 Ga/S，600 °C 时的二氧化碳转化率为 35%，甲烷转化率为 28%，碳沉积较少（17%）。此外，还通过数学模型对 DRM 工艺进行了优化。该模型确定的最佳条件如下：温度（800 °C）、气体流速（GHSV-30,000 ml h-1gcat-1）和甲烷与二氧化碳的比例（1:1）。模型预测 CH4 和 CO2 转化率分别为 76.76% 和 82.0%，H2/CO 比率为 1.02，而实验结果显示 CH4 转化率为 74.56%，CO2 转化率为 83.25%，H2/CO 比率为 1.01。该模型与实验观测结果非常吻合，误差小于 3%。

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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.