摘要
分别以硝酸镍和乙酸镍为前驱体,采用沉淀法制备了非负载型Ni催化剂,运用X射线衍射、H2-程序升温还原及CH4程序升温表面反应对催化剂进行了表征,并考察了Ni催化剂上CH4分解反应活性.结果表明,以乙酸镍为前驱体制得的NiO样品粒子尺寸较小,较易被还原,还原后得到的催化剂催化CH4分解活性和稳定性较高;而以硝酸镍为前驱体制得的NiO样品粒子尺寸较大,较难被还原,还原后催化剂上CH4分解活性和稳定性较低.制备过程中乙酸镍与溶剂乙二醇所形成的配合物是获得尺寸较小NiO样品的关键.
Non-supported nickel oxide catalyst samples were prepared by precipitation using different nickel precursors.The influence of nickel precursors on catalyst behavior was investigated by X-ray diffraction,H2 temperature-programmed reduction,CH4 temperature-programmed surface reaction,and methane decomposition stability tests.The results showed that the particle size of the NiO sample prepared from a nickel acetate precursor（named NiO-A） was smaller than that of the NiO sample prepared from nickel nitrate（NiO-N）.NiO-A could be reduced more easily than NiO-N,and the activity of the reduced NiO-A sample（Ni-A） for methane decomposition was higher than that of the reduced NiO-N sample（Ni-N）.The complexation of nickel acetate with glycol was the key factor leading to the smaller NiO particles.The results of the catalytic stability tests showed that the Ni-A catalyst exhibited higher stability than the Ni-N catalyst.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2010年第11期1358-1362,共5页
基金
国家重点基础研究发展计划(973计划
2005CB221401)
关键词
硝酸镍
乙酸镍
氧化镍
非负载型催化剂
甲烷
分解
nickel nitrate
nickel acetate
nickel oxide
non-supported catalyst
methane
decomposition
