La_((1-x))Sr_(x)NiO_(3)钙钛矿型催化剂的制备及其用于氨催化裂解产氢的研究  

Preparation of La_((1-x))Sr_(x)NiO_(3)catalyst for ammonia cracking to produce hydrogen

作　　者：张颢玉 张振东 ZHANG Hao-yu;CHONG Cheng-dong(China-UK Low Carbon College,Shanghai Jiao Tong University,Shanghai 201306,China)

机构地区：[1]上海交通大学中英国际低碳学院,上海201306

出　　处：《现代化工》2024年第S02期190-196,共7页Modern Chemical Industry

基　　金：上海市科委“科技创新行动计划”国际科技合作项目(23160712400)。

摘　　要：采用凝胶溶胶法制备了Sr^(2+)掺杂的La_((1-x))Sr_(x)NiO_(3)(x分别为0、0.2、0.4、0.6、0.8)的钙钛矿型催化剂,Sr^(2+)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℃、NH_(3)流速37500 mL/(h·g)的100%NH_(3)中,NH_(3)转换率可达100%,较LaNiO_(3)催化作用下的NH_(3)转换率提高了5.12%。利用Design Expert软件对La_(0.6)Sr_(0.4)NiO_(3)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NH_(3)转换率达到95.548%。A gel-sol method was used to prepare Sr^(2+)-doped La_((1-x))Sr_(x)NiO_(3)(x=0,0.2,0.4,0.6,0.8)perovskite catalyst.It was found that Sr^(2+)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 NH_(3)flow rate of 37500 mL/(h·g),the NH_(3)conversion rate can reach 100%,which is 5.12%higher than the NH_(3)conversion rate using LaNiO_(3)as catalyst.Design Expert software was used to optimize the synthesis conditions of La0.6Sr0.4NiO_(3),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.

关 键 词：钙钛矿型催化剂 氨裂解制氢 Sr掺杂 

分 类 号：TK16[动力工程及工程热物理—热能工程]