稀土双钙钛矿型铝系催化剂的制备及甲烷催化燃烧性能研究
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摘要
天然气传统燃烧利用方式不仅造成严重的环境污染,而且能源利用效率低。催化燃烧技术作为一种环境友好且燃烧效率高的能源利用方式越来越受到重视。
     本文采用柠檬酸溶胶-凝胶法制备了铝系La2BAlO6(B=Co、Ni、Mn)稀土双钙钛矿型催化剂,并与相应的稀土单钙钛矿型催化剂LaBO3(B=Co、Ni、Mn、Al)进行了比较,考察了焙烧温度对双钙钛矿型氧化物的影响,探讨了A位上Sr取代La对钙钛矿型复合氧化物催化剂的甲烷催化燃烧性能的影响。利用X射线粉末衍射(XRD)、H2-程序升温还原(H2-TPR)、比表面(BET)、扫描电镜(SEM)、傅立叶变换红外吸收光谱(FT-IR)和磁性测试等手段对样品进行了表征,以甲烷催化燃烧反应为探针考察了其催化活性,并与其物理化学性能进行了关联。
     实验结果表明,在空气气氛中1100℃焙烧3h后,铝系La-B-Al-O(B=Co、Ni、Mn)催化剂均形成了单相的La2CoAlO6、La2NiAlO6和La2MnAlO6稀土双钙钛矿型化合物。其中La2NiAlO6表现出较好的甲烷催化燃烧活性,其起燃温度(T10)和完全转化温度(T90)分别为433.1℃和649.7℃, La2CoAlO6次之,La2MnAlO6:最差。从催化剂的H2-TPR谱图中发现,La2NiAlO6较好的甲烷催化燃烧活性与其较低的还原峰温有天。
     同时,对稀土双钙钛矿型La-B-Al-O(B=Co、Ni、Mn)系列催化剂与相应的单钙钛矿型La-B-O(B=Co、Ni、Mn、Al)系列催化剂进行了系统的比较。活性测试结果表明,双钙钛矿系列催化剂活性均优于相应的单钙钛矿型催化剂,与相应的两种单钙钛矿型催化剂混合物相比,双钙钛矿仍表现出良好的催化活性,这说明在双钙钛矿催化剂La2BAlO6(B=Co、Ni、Mn)结构中,B位元素与Al元素之间存在着协同作用,而这种协同作用对甲烷催化燃烧反应是有利的。
     在此基础上,重点考察了不同焙烧温度对La2NiAlO6结构及甲烷催化燃烧活性的影响。结果表明,当焙烧温度提高到800℃时,La-Ni-Al-O体系开始形成了双钙钛矿的结构,此后随着焙烧温度的升高,La2NiAlO6的晶型逐步完善。
     最后,发现在A位上用少量Sr取代La有助于双钙钛矿型催化剂La2NiAlO6催化活性的提高,但掺杂过高反而会使其催化活性下降。双钙钛矿La1.90Sr0.10NiAlO6的活性最好,比表面积最大,其起燃温度(T10)和完全转化温度(T90)分别为398.7℃和622.9℃。
Conventional combustion of natural gas (i.e.methane) not only causes serious air pollution,but also has low utilization efficiency.Catalytic combustion of methane as an environmentally friendly is becoming more and more attractive in recent years due to the high combustion efficiency.
     In this paper, the rare earth double perovskite-type catalysts La2BAlO6(B=Co、Ni、Mn) were prepared by the sol-gel method using citric acid as complex agent, and compared with the corresponding single perovskite-type catalysts LaBO3(B=Co、Ni、Mn、Al). Moreover, the influence of the calcination temperature of the double perovskite-type oxides and Sr replace La in A-site of perovskite oxide catalyst on the performance of methane combustion was studied. The catalysts were characterized by X-ray powder diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), specific surface area (BET), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and magnetic property measurement, and was tested for methane combustion.
     Results showed that a single-phase rare-earth double perovskite oxide La2BAlO6(B=Co、Ni、Mn) could be formed by calcinations at 1100℃for 3 h. The La2NiAlO6 demonstrates the best catalytic activity for methane combustion. It has a light-off temperature (T10)of 433.1℃and a total conversion temperature (T90) of 649.7℃, then the La2CoAlO6, and La2MnA106 is the worst. Furthermore, La2NiAlO6 samples show excellent catalytic activity for methane combustion which could be related to the decrease of reduction temperature observed in H2-TPR experiments, probably due to an increased oxygen mobility promoted by the presence of aluminum.
     Meanwhile compared the rare earth double perovskite-type La2BAlO6(B=Co、Ni、Mn) series catalysts with the corresponding single perovskite-type catalysts LaBO3(B=Co、Ni、Mn、Al). Catalytic activity testing results showed that double perovskite series catalytic activity are superior to the corresponding single perovskite catalyst. In addition, the double perovskite still showed good catalytic activity which compared to the mixture of two kinds single perovskite catalysts. This explained that exist synergy between B-site element and Al elements in double perovskite catalyst La2BAlO6 (B= Co, Ni, Mn) structure, and this synergy effect on methane catalytic combustion reaction is favorable.
     Furthermore, the influence of the calcination temperature of the double perovskite-type oxides La2NiAlO6 on the physicochemical properties and the performance of methane combustion was studied. The results indicated that, La-Ni-Al-O system could be formed double perovskite-type oxides La2NiAlO6 at 800℃, with increasing the calcination temperature the structure of double perovskite La2NiAlO6 is perfect
     In the end, the perovskite oxide catalysts La2NiAlO6 of A-site replaced Sr were synthesized through citric acid method. The catalytic activity of La2NiAlO6 for the performance of methane combustion was studied, appropriate replace content is beneficial to enhance catalytic activity of La2NiAlO6.The results showed that, double perovskite Lai.90Sr0.10NiAlO6 has the higher surface area, and it has the best activity for methane combustion, whose T10 and T90 were 398.7℃and 622.9℃, respectively.
引文
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