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In contrast to other conventional zeolites, ZSM-5 zeolites can be synthesized with very high silicon-toaluminum ratio, but also with low aluminum-to-silicon ratio of less than 1/10. The hexane cracking activity of ZSM-5 zeolites is linearly proportional to the aluminum content even at the ppm level, indicating that variation of the aluminum content in the ZSM-5 structure will not result in any change in the catalytic activity1), whereas the reactivity can be changed. Therefore, to qualitatively modify the excess acidity and hydrogen transfer characteristics of ZSM-5 zeolites, various MFI-type metallosilicates have been synthesized by substituting aluminum in ZSM-5 with other transition elements at the stage of gel formation prior to crystallization2)~9). The catalytic performance of such metallosilicates for various types of reactions has also been investigated. Various MFI-type metallosilicates were synthesized using our original preparation method, i.e., a rapid crystallization method10)~12). Addition of very small amounts of other elements (atomic ratio of silicon to metal=3200)10),13),14) and various metal sources15)~17) caused significant changes in not only the morphology of the synthesized crystals, but also the catalytic activity for methanol and propylene conversion. In methanol conversion, the catalytic activities of both Co_ and Ni_ silicates were similar to that of Fe_silicate, and the catalytic activity of Mn_silicate was similar to that of ZSM-513). However, the very small amounts of manganese, cobalt, and nickel did not show whether these catalytic activities were attributable to the presence of metal in the metallosilicate or to the effect of aluminum contaminant on the catalytic activity of the metallosilicate. The present study investigated the catalytic properties of MFI-type metallosilicates containing manganese and iron group metals such as iron, cobalt and nickel in light olefin conversions for comparison with that of ZSM-5 zeolite (Al_silicate).

journal of the japan petroleum institute

Characterization and Catalytic Properties in Light Olefin Conversions of MFI-type Metallosilicate Containing Manganese or Iron Group Metal Prepared by Rapid Crystallization Method