Exploration of Alkali Metal-Induced Effects on Promoting Ammonia Decomposition Performance

被引:5
|
作者
Liu, Hongming [1 ]
Liang, Junhui [1 ]
Li, Jiaxin [1 ]
Du, Yuhui [1 ]
Chen, Hangning [2 ]
Du, Chenhao [2 ]
Wang, Liuqi [3 ]
Li, Yincheng [4 ]
Huang, Yuexiang [1 ]
Chen, Da [1 ]
机构
[1] China Jiliang Univ, Coll Mat & Chem, Hangzhou 300018, Zhejiang, Peoples R China
[2] Sinopec Shanghai Res Inst Petrochem Technol Co Ltd, Shanghai 201208, Peoples R China
[3] Taizhou Threeway Vehicle Catalyt Converter Co Ltd, Taizhou 318020, Zhejiang, Peoples R China
[4] Minnan Inst Sci & Technol, Quanzhou 362000, Fujian, Peoples R China
基金
中国国家自然科学基金;
关键词
COX-FREE HYDROGEN; OXYGEN VACANCIES; CATALYSTS; GENERATION;
D O I
10.1021/acs.energyfuels.4c02113
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
While ammonia serves as a carbon-free hydrogen carrier, addressing challenges in hydrogen energy storage and transportation, the present technology for thermocatalytic ammonia decomposition encounters constraints owing to elevated decomposition temperatures. Alkali metal promoters have been demonstrated to effectively lower the reaction temperature. However, their precise role in the process of ammonia dehydrogenation remains not fully understood. Herein, we investigated the impact of alkali metals by incorporating various base treatments (with (i.e., KOH) or without alkali metals (i.e., NH3<middle dot>H2O)) during the deposition process. The results indicate that compared to samples without alkali metal treatment, catalysts with added alkali metals (5 wt % Ru/CeO2-NP(KOH)) show a 16.7% improvement in ammonia decomposition efficiency and a 5.54 mmol g(cat)(-1) min(-1) increase in hydrogen production rate under the same test conditions (500 degrees C, gas hourly space velocity (GHSV) of 30,000 mL g(cat)(-1) h(-1)). This phenomenon may be attributed to the dual promotion of alkali metal K in regulating both vacancy defects and metal active sites. The regulatory mechanism of alkali metal activity proposed by us not only provides a better understanding of the specific role of alkali metals in the reaction process but also holds significant implications for guiding the design of novel catalysts.
引用
收藏
页码:13255 / 13263
页数:9
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