α-alumina-supported nickel catalysts prepared with nickel acetylacetonate.: 2.: A study of the thermolysis of the metal precursor
α-alumina-supported nickel catalysts prepared with nickel acetylacetonate.: 2.: A study of the thermolysis of the metal precursor
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DOI：
10.1021/jp9907286
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发表时间：
1999-12-23
影响因子：
3.3
通讯作者：
Poncelet, G
中科院分区：
文献类型：
--
作者：
Molina, R;Poncelet, G
用热重-差热分析（TGA-DTG-DTA）、红外光谱（FTIR）和X射线光电子能谱（XPS）研究了乙酰丙酮镍在α-Al_2O_3上的热稳定性。在250 ℃和静态空气气氛中，金属配体的分解几乎完全。在惰性气氛或真空中需要更高的温度。在120和900摄氏度之间的各种温度下加热的样品的XPS峰参数的变化已被解释为在八面体和四面体的铝网站的支持之间的Ni物种的分布的变化，和铝酸镍样物种的逐步形成，在协议与程序升温还原功能。
The thermolysis of nickel acetylacetonate supported on alpha-alumina has been investigated by thermal methods (TGA-DTG-DTA), infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). At 250 degrees C and in static air atmosphere, decomposition of the metal ligands is nearly complete. Higher temperatures are needed in an inert atmosphere or in a vacuum. The variation of XPS peak parameters of samples heated at various temperatures between 120 and 900 degrees C has been interpreted as a change of the distribution of the Ni species between the octahedral and tetrahedral aluminum sites of the support, and a progressive formation of a nickel aluminate-like species, in agreement with temperature-programmed reduction features.