Promotion effect of cerium and lanthanum oxides on Ni/SBA-15 catalyst for ammonia decomposition

✍ Scribed by Hongchao Liu; Hua Wang; Jianghan Shen; Ying Sun; Zhongmin Liu

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 662 KB
• Volume: 131
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.10.048

✦ Synopsis

CeNi/SBA-15 and LaNi/SBA-15 catalysts were prepared by deposition-precipitation (DP) method and characterized by N 2 physical adsorption, XRD, H 2 -TPR, H 2 -chemisorption and TEM. Their catalytic performances in the ammonia decomposition reaction were tested and compared with Ni/SBA-15 catalyst. Addition of cerium and lanthanum oxides to the Ni/SBA-15 catalyst caused some decrease of BET surface area and pore volume of the catalysts, but led to a promotion effect to their catalytic activity which was closely related to the ratio of Ce (La)/Ni. The highest conversion of ammonia could be obtained when the Ce (La)/Ni ratio was around 0.3. The promotion effect is more evident on CeNi/ SBA-15(0.3) than on LaNi/SBA-15(0.3) catalyst under identical reaction conditions. The CeNi/SBA-15 and LaNi/SBA-15 catalysts show smaller nickel particle size and easier reducibility in comparison with the Ni/SBA-15 catalysts.