Characterization and catalytic activity of NiO/mesoporous aluminosilicate AlSBA-15 in conversion of some hydrocarbons

Egyptian Journal of Petroleum

关键词: Ni catalysts;    Mesoporous silica;    AlSBA-15;    Textural properties;    TPR;    N2 physisorption;   

DOI  :  10.1016/j.ejpe.2012.02.001

来源: DOAJ

【 摘 要 】

Mesoporous aluminosilicate AlSBA-15 was synthesized and adopted as a support for NiO with 3, 6 and 9 wt.% loadings. Characterization of various samples was performed through XRD, FTIR, DSC-TGA, TPR, SEM and TEM techniques. Textural and morphological characteristics were examined using N2 adsorption–desorption isotherms. Catalytic activities were measured in cumene cracking for parent AlSBA-15 and in n-hexane and toluene cracking and cyclohexane dehydrogenation for supported NiO samples. Uniformity of the ordered 2D-hexagonal structure of AlSBA-15 was evident even after loading with NiO. NiO and NiOOH phases could be detected particularly in the sample containing 9 wt.% NiO. TPR profile of solid loaded with 3 wt.% NiO sample showed negative peaks at 400 and 600 °C, related to hydrogen spillover on reduced sample. Selectivity towards n-hexane and toluene cracking increased with both temperature and metal oxide loading, achieving 100% at 350 °C. In cyclohexane dehydrogenation, the sample loaded with 3 wt.% NiO was the most active and selective one towards benzene formation.

【 授权许可】

Unknown