铈在促进以磷酸盐改性氧化锆为载体的镍催化剂进行甲烷部分氧化中的作用

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS Energy Science & Engineering Pub Date : 2024-07-02 DOI:10.1002/ese3.1820
Abdulaziz A. M. Abahussain, Ahmed S. Al-Fatesh, Dharmesh M. Vadodariya, Jehad K. Abu-Dahrieh, Khaled M. Banabdwin, Naif Alarifi, Ahmed A. Ibrahim, Anis H. Fakeeha, Ahmed E. Abasaeed, Rawesh Kumar
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引用次数: 0

摘要

催化甲烷部分氧化(POM)的目的是减少环境中的甲烷(CH4)(一种强效温室气体),并合成高 H2/CO 比的合成气。为了提高 POM 反应的效果,我们在镍支撑的磷酸盐改性氧化锆中加入了促进剂 "Ce",以实现高 H2/CO 比(2.4-3.2)。催化剂的表征包括表面积和孔隙率、X 射线衍射、RAMAN、温度编程实验(TPR、CO2-TPD 和 TPO)和 TEM。在 10Ni/PO4 + ZrO2 上增加铈的添加量可降低结晶度,提高活性位点的分散度,并增加催化剂的表面积。铈含量为 4 wt.%时,NiO 物种和表面氧化物离子分别具有独特而突出的还原性和碱性。在 600°C 的反应温度下,10Ni/PO4 + ZrO2 的铈负载量为 4 wt.%时,活性位点的浓度最高,中等强度的碱性位点的浓度也很独特。这使得 POM 反应的 CH4 转化率达到 44%,H2 产率达到 36%,CO2 产率达到 35%,H2/CO 比率达到 3.16。循环 H2TPR-O2TPO-H2TPR 实验证实,在氧化性气体 O2 和还原性气体 H2 的气流作用下,POM 反应的活性位点向高温方向重组。
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The role of ceria in promoting Ni catalysts supported on phosphate-modified zirconia for the partial oxidation of methane

The catalytic partial oxidation of methane (POM) is aimed at the mitigation of CH4 (a highly potent greenhouse gas) from the environment and the synthesis of syngas with a high H2/CO ratio. Herein, to enhance the POM reaction, Ni-supported phosphate-modified-zirconia were synthesized with promotor “Ce” to achieve high H2/CO ratio (2.4–3.2). The catalysts were characterized by surface area and porosity, X-ray diffraction, RAMAN, temperature-programmed experiments (TPR, CO2-TPD, and TPO), and TEM. Increasing the ceria addition over 10Ni/PO4 + ZrO2 resulted in lower crystallinity, higher dispersion of active sites, and enhanced the surface area of catalyst. The unique and prominent reducibility and basicity of NiO-species and surface oxide ions, respectively, are particularly notable at 4 wt.% ceria loading. At a reaction temperature of 600°C, the highest concentration of active sites and a unique concentration of moderate strength basic sites can be achieved with 4 wt.% ceria loading over 10Ni/PO4 + ZrO2. This leads to 44% conversion of CH4, 36% yield of H2, 35% yield of CO2, and H2/CO ratio of 3.16 for the POM reaction. The cyclic H2TPR-O2TPO-H2TPR experiment confirms the reorganization of the active site towards high temperature under oxidizing gas O2 and reducing gas H2 gas stream during the POM reaction.

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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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