MCM-22型分子筛的合成及其用于生产异丙苯的催化性能

MCM-22 molecular sieve was first reported by Rubin et al1] in Mobil Company.Similar to ZSM-5 zeolite, MCM-22 belongs to the category of medium pore zeolites.However, it possesses unique structural features2] that have not been demonstrated before. The structure of MCM-22 was resolved by Mobil scientists using high resolution microscopy and X-ray diffraction analysis. It is found that MCM-22 consists of two independent and non-interconnecting channel systems, each accessible through 10-ring apertures. One of these pore systems is composed of uniform circular 10-ring pores about 0.6 nm. The other is composed of 12-ring egg-shaped supercages with inner free diameter of 0.71 nm and inner height of 1.82 nm. Usually the zeolite crystallizes as thin sheets or plates of stocked layers. Therefore, MCM-22 has been actively studied and this peculiar zeolite may have potential applications in the petrochemical and petroleum industries in the near future, including reactions such as disproportionation3], catalytic cracking of hydrocarbons4], aromatic/ethylene alkylation5], isoalkane/olefins6] and methanol/olefins alkylation7] etc.

SYNTHESIS OF MCM-22 TYPE ZEOLITE AND ITS CATALYTIC PERFORMANCE FOR CUMENE PRODUCTION

MCM-22 molecular sieve was first reported by Rubin et al1] in Mobil Company.Similar to ZSM-5 zeolite, MCM-22 belongs to the category of medium pore zeolites.However, it possesses unique structural features2] that have not been demonstrated before. The structure of MCM-22 was resolved by Mobil scientists using high resolution microscopy and X-ray diffraction analysis. It is found that MCM-22 consists of two independent and non-interconnecting channel systems, each accessible through 10-ring apertures. One of these pore systems is composed of uniform circular 10-ring pores about 0.6 nm. The other is composed of 12-ring egg-shaped supercages with inner free diameter of 0.71 nm and inner height of 1.82 nm. Usually the zeolite crystallizes as thin sheets or plates of stocked layers. Therefore, MCM-22 has been actively studied and this peculiar zeolite may have potential applications in the petrochemical and petroleum industries in the near future, including reactions such as disproportionation3], catalytic cracking of hydrocarbons4], aromatic/ethylene alkylation5], isoalkane/olefins6] and methanol/olefins alkylation7] etc.