PETR 47 |
| Large pore size, thick pore wall, highly stable mesoporous SBA-15 offers significant potential as a solid acid catalyst for the processing of gasoil, but lacks the acidity or well-defined active sites due to difficult in incorporating aluminum. The objective of this work is to investigate the incorporation aluminum and the associated strong Brönsted acidic within the channel walls of mesoporous SBA-15 using preformed zeolite Y aluminosilicate precursors. Thus highly ordered aluminum-containing SBA-15 was synthesized from aged zeolite Y precursor and a conventional SBA-15 synthesis mixture in a slightly acidic media of pH 4-6 with 2M sulfuric acid and under hydrothermal conditions. The SBA-15/zeolite Y composites showed type IV adsorption isotherms, narrow pore size distribution of 4.9 nm, surface areas up to 800 m2/g, and pore volumes 1.03 cm3, all comparable to pure SBA-15 synthesized under similar conditions. Chemical analysis revealed 2 % Al in the solid product of most aluminated sample investigated from a synthesis mixture with Si/Al ratio of 50, and SS MAS NMR confirmed all aluminum was in tetrahedral (Td) coordination in the SBA-15/ZY composites. BrÖnsted acid sites were evident from a pyridinium peak at 1544 cm-1 in the FTIR spectrum after pyridine adsorption. SBA-15/ZY composites showed significant catalytic activities for the dealkylation of isopropylbenzene to benzene and propene. Cumene conversion increased with increase the in the amount of ZY precursor mixture added to the SBA-15 synthesis mixture. Details of the above and the catalytic conversion of gasoil using these catalysts will be presented. |
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Division of Petroleum Chemistry Poster Session
8:30 AM-10:30 AM, Monday, 11 September 2006 Moscone Center -- Hall D, Poster
Division of Petroleum Chemistry |