化工进展 ›› 2022, Vol. 41 ›› Issue (12): 6350-6357.DOI: 10.16085/j.issn.1000-6613.2022-0392

• 工业催化 • 上一篇    下一篇

氨分解制氢棒状La x Ce1-x O y 负载Ru催化剂

张姗(), 刘化章()   

  1. 浙江工业大学工业催化研究所,浙江 杭州 310014
  • 收稿日期:2022-03-14 修回日期:2022-04-24 出版日期:2022-12-20 发布日期:2022-12-29
  • 通讯作者: 刘化章
  • 作者简介:张姗(1995—),女,硕士研究生,研究方向为氨分解。E-mail:2771354349@qq.com

Rod La x Ce1-x O y supported Ru catalyst for hydrogen production by ammonia decomposition

ZHANG Shan(), LIU Huazhang()   

  1. Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Received:2022-03-14 Revised:2022-04-24 Online:2022-12-20 Published:2022-12-29
  • Contact: LIU Huazhang

摘要:

氨分解得到的H2不含CO x 、SO x 、NO x 等有害物质,是其他所有含碳资源为原料制氢所不能比拟的。本文采用无模板水热法制备了一系列棒状载体,并采用沉积沉淀法制备了Ru/La x Ce1-x O y 催化剂,考察了制备方法、催化剂组成对性能的影响,并通过扫描电镜(SEM)、X射线衍射(XRD)、BET、H2-程序升温还原(TPR)和CO2-程序升温脱附(TPD)进行了表征。结果表明,La2O3掺杂量为40%的Ru/La0.4Ce0.6O1.8催化剂在常压、7800h-1、450℃下氨分解转化率为98%。该催化剂活性高归因于部分还原的CeO2-x 对Ru的供电子性能和Ru/La0.4Ce0.6O1.8催化剂表面的强碱性增加了对Ru活性位的给电子能力。同时考察了K2O含量的影响,最优的催化剂为Ru-2%K/La0.4Ce0.6O1.8,在400℃、7800h-1氨气转化率可以达到93%。结果表明Ru-2%K/La0.4Ce0.6O1.8可以作为一种新型高效氨分解催化剂,为工业化应用提供了可能,具有良好的发展前景。

关键词: Ru催化剂, 制氢, 载体, 复合材料, 活性, 固定床

Abstract:

The hydrogen by ammonia decomposition does not contain CO x, SO x, NO x and other harmful substances, which is advantageous to other carbon-containing hydrogen production methods. In this paper, a series of rod-like supports were prepared by a template-free hydrothermal method, and Ru/La x Ce1-x O y catalysts were prepared by a deposition precipitation method. The effects of preparation method and catalyst composition on the decomposition performance were investigated and the catalysts were characterized by SEM, XRD, BET, H2-TPR and CO2-TPD. The results showed that the ammonia decomposition rate of Ru/La0.4Ce0.6O1.8 catalyst with 40% La2O3 doping was 98% at normal pressure, 7800h-1 and 450℃. The high activity was attributed to the electro donating to metal Ru by the partially reduced CeO2-x and the strong basicity of the Ru/La0.4Ce0.6O1.8 catalyst surface. At the same time, the influence of K2O was investigated, and the optimal catalyst was Ru-2%K/La0.4Ce0.6O1.8, which gave an ammonia conversion of 93% at 400℃, 7800h-1, allowing it to be used as a promising new type high-efficiency ammonia decomposition catalyst in industry.

Key words: Ru catalyst, hydrogen production, support, composites, reactivity, fixed-bed

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