镍前驱体对非负载型镍催化剂上甲烷分解活性的影响  

Influence of Nickel Precursors on Catalytic Activity of Non-supported Ni for Methane Decomposition

作　　者：张微[1,2] 葛庆杰[1] 徐恒泳[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院研究生院,北京100049

出　　处：《催化学报》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)

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.

关 键 词：硝酸镍 乙酸镍 氧化镍 非负载型催化剂 甲烷 分解 

分 类 号：O643.36[理学—物理化学]