Catalytic ammonia decomposition to COx-free hydrogen over ruthenium catalyst supported on alkali silicates

被引:28
作者
Fu Zhiqiang [1 ]
Wang Ziqing [1 ]
Li Dexing [1 ]
Lin Jianxin [2 ]
Yu Lingzhi [1 ]
Wu Qin [1 ]
Wei Zhong [1 ]
机构
[1] Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China
[2] Fuzhou Univ, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Fujian, Peoples R China
基金
中国国家自然科学基金;
关键词
Ammonia decomposition; Hydrogen energy; Ruthenium catalyst; Silicates support; Electronic metal-support interaction; RU/GAMMA-AL2O3; CATALYSTS; PARTICLE-SIZE; RU CATALYST; GENERATION; OXYGEN; SIO2; NANOPARTICLES; ZRO2; XPS;
D O I
10.1016/j.fuel.2022.125094
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
A series of alkali metal silicates A(2)SiO(3) (A = Li, Na and K) were synthesized by a sol-gel method route and employed as support for Ru nanoparticles to catalyze NH3 decomposition. The NH3 conversion can be ranked as the order of Ru/K2SiO3 > Ru/Na2SiO3 > Ru/Li2SiO3 > Ru/SiO2 at the same conditions, and Ru/K2SiO3 displays the highest NH3 conversion of 60.5% with the TOF (H2) of 2.03 s(-1) under the weight hourly space velocity (GHSV) of 30,000 mL.g(cat)(-1).h(-1) at 450 degrees C. The combination results of different characterization indicate that the formation of alkali metal silicates can increase the strength and number of basic sites, and the strong electronic metalsupport interaction (EMSI) would appear between Ru particles and oxygen vacancies in A(2)SiO(3) structure at reduction conditions. The presence of EMSI can result in the higher Ru dispersion and enhanced electronic density of Ru particles over A(2)SiO(3), greatly facilitating the decomposition of NH3 to COx-free hydrogen.
引用
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页数:9
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