Performance of NiO-CeO2/γ-Al2O3 composite oxygen carriers for hydrogen generation with chemical looping reforming

被引：0

作者：

Han D. ^{[1
]}

Guo X. ^{[1
]}

Wang Z. ^{[1
]}

机构：

[1] School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 01期

关键词：

Chemical looping reforming; Composite oxygen carrier; Fixed-bed; Hydrogen production; Methane; Reactivity;

D O I：

10.16085/j.issn.1000-6613.2021-0372

中图分类号：

学科分类号：

摘要：

NiO-CeO2/γ-Al2O3 oxygen carrier was prepared with the impregnation method and the effects of Ni/Ce mass ratios on the performance of chemical looping reforming hydrogen production were studied. The experiments with fixed bed reactor revealed that the selectivity of hydrogen first increased and then decreased as the ratio decreases. For the ratio of 3:1, there was a maximal selectivity of hydrogen together with the highest concentration of hydrogen produced. The cycle test showed that the 3:1 oxygen carrier still maintained good reaction activity and the lowest carbon deposited after 20 cycles. Meanwhile, the XRD results showed that addition of CeO2 was leads to formation of Ce-O-Ni solid solution, which weakened the interaction between NiO and γ-Al2O3 to a certain extent, and subsequently increased oxygen vacancies and improved the dispersion of active materials. Further analyses on the XRD results indicated that the 3:1 oxygen carrier had the smallest particle size, which was more conducive to hydrogen production by reaction. In fact, the microscopic morphology of the 3:1 oxygen carrier particles only changes slightly after 20 cycles of testing according to SEM analyses. The further fixed bed experiments indicated that higher temperature was conducived to the hydrogen production reactions and the 3:1 oxygen carrier performed significantly better than the others. Meanwhile, it was found the 3:1 oxygen carrier could still maintain high product selectivity under higher water-to-carbon ratio. © 2022, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：192 / 200

页数：8

共 32 条

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