氨辅助沉淀法Ni/SiO2催化剂的甲烷干重整催化性能研究
俞择修 , 刘元俏 , 金慧瑶 , 黄礼智 , 刘亚丽 , 崔莎 , 魏勤洪 , 刘辉 , 王路辉
现代化工 ›› 2025, Vol. 45 ›› Issue (10) : 148 -153.
氨辅助沉淀法Ni/SiO2催化剂的甲烷干重整催化性能研究
Study on catalytic performance of Ni/SiO2 catalyst prepared via ammonia-assisted precipitation for methane dry reforming
采用氨辅助沉淀法制备Ni/SiO2-DP催化剂以及普通浸渍法制备Ni/SiO2-IM催化剂。氨水参与Ni/SiO2-DP催化剂的制备,在水溶剂环境下,其一方面催化正硅酸四乙酯水解缩合生成二氧化硅,另一方面与镍盐络合避免形成Ni(OH)2沉淀,同时碱性环境有利于形成硅酸盐结构,强金属-载体相互作用提高了催化剂的还原温度,促进金属镍颗粒在二氧化硅载体上的分散,还原后得到粒径小于5 nm的Ni颗粒。经过性能测试,Ni/SiO2-DP催化剂在700℃下反应20 h后,二氧化碳和甲烷转化率以及H2/CO体积比保持不变,同时在反应后没有发现Ni颗粒的迁移和生长,Ni粒径没有明显增大,TG测试没有检测到任何积炭。相比于Ni/SiO2-IM催化剂,Ni/SiO2-DP催化剂具有优异的抗烧结性以及抗积炭性。
In this study,Ni/SiO2-DP catalysts are prepared via ammonia-assisted precipitation method,while Ni/SiO2-IM catalysts are prepared by the conventional impregnation method.As ammonia water involves in the preparation of Ni/SiO2-DP catalysts,it catalyzes the hydrolysis and condensation of tetraethyl orthosilicate to form silica in an aqueous environment,while complexes with nickel salt on the other hand to avoid the formation of Ni(OH)2 precipitation.Furthermore,the alkaline environment is conducive to the formation of silicate structure.Strong metal-support interaction increases the reduction temperature of the catalyst,promotes the dispersion of metal nickel particles on the silica support,from which Ni particles with a size of less than 5 nm are obtained after the reduction.Through performance test,both the conversion rate of carbon dioxide to methane and the H2/CO ratio in the products remain unchanged after MDR reaction over Ni/SiO2-DP catalyst has performed at 700℃ for 20 h.No migration and growth of Ni particles are found after the reaction,the sizes of Ni particles do not increase significantly,and no carbon deposition is detected by the TG test.Compared with Ni/SiO2-IM catalysts,Ni/SiO2-DP catalysts have excellent resistances to sintering and carbon deposition.
methane dry reforming / resistance to carbon deposits / stability / Ni/SiO2
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国家自然科学基金青年基金(22202180)
舟山科技计划项目(2023C41003)
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