采用凝胶溶胶法制备了Sr²⁺掺杂的La_(1-x)Sr_xNiO₃(x分别为0、0.2、0.4、0.6、0.8)的钙钛矿型催化剂,Sr²⁺掺杂可以通过增强催化剂碱性和碱性位点数量、改善催化剂氧化还原行为提升催化剂活性。气相色谱分析结果表明,当x=0.4时,催化剂活性最高,在裂解温度为650℃、NH₃流速37 500 mL/(h·g)的100% NH₃中,NH₃转换率可达100%,较LaNiO₃催化作用下的NH₃转换率提高了5.12%。利用Design Expert软件对La_0.6Sr_0.4NiO₃进行合成条件优化发现,在煅烧温度为700℃、煅烧时间为3.39 h、柠檬酸与硝酸盐的物质的量的比为1.2时催化剂催化活性最高,600℃下NH₃转换率达到95.548%。

A gel-sol method was used to prepare Sr²⁺-doped La_(1-x)Sr_xNiO₃ (x=0,0.2,0.4,0.6,0.8) perovskite catalyst.It was found that Sr²⁺ doping can improve the catalyst activity by enhancing the basicity and the number of basic sites of the catalyst and improving the redox behavior of the catalyst.Gas chromatography analysis showed that when x=0.4,the catalyst activity is the highest.At the cracking temperature of 650℃ and NH₃ flow rate of 37 500 mL/(h·g),the NH₃ conversion rate can reach 100%,which is 5.12% higher than the NH₃ conversion rate using LaNiO₃ as catalyst.Design Expert software was used to optimize the synthesis conditions of La_0.6Sr_0.4NiO₃,and it was found that the catalyst had the highest catalytic activity (95.548% at 600℃) when the calcination temperature was 700℃ and calcination time of 3.39 h,while the mass ratio of citric acid to nitrate was 1.2.

张颢玉(1999-),女,硕士生,研究方向为氨催化裂解,zhy990123@sjtu.edu.cn;张振东(1984-),男,博士,副教授,研究方向为碳中和燃料制备与应用,通讯联系人,ctchong@sjtu.edu.cn。