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- W108273019 abstract "A series of modified SSZ-33 molecular sieves (CON topology) are used as catalysts for the reactions of m-xylene. Borosilicate SSZ-33 is transformed into the aluminosilicate form by a low-temperature hydrothermal treatment. Aluminosilicate SSZ-33 samples with different aluminum populations behave similarly in the reactions of m-xylene, suggesting that the intracrystalline pore space acts as an ensemble of cages connected by 10- and 12-member rings (MR) rather than intersecting 10-MR and 12-MR channels. Additionally, at low m-xylene flow rates, SSZ-33 samples with high Si/Al ratios show an increased amount of transalkylation and the para/ortho (p/o) and isomerization/disproportionation (i/d) selectivities are lower. Reaction over external-surface deactivated SSZ-33 at low flow rates results in unaltered p/o ratios. In contrast, reaction over SSZ-33 which contains only aluminum at or near the surface has a greatly decreased p/o ratio. The loss in p/o and i/d selectivity at low flow rates can be attributed to the occurrence of ortho-selective bimolecular isomerization at or near the catalyst external surface." @default.
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- W108273019 date "1999-05-01" @default.
- W108273019 modified "2023-10-17" @default.
- W108273019 title "Reactions of m-xylene on zeolites with intersecting medium and large pores" @default.
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- W108273019 doi "https://doi.org/10.1016/s1387-1811(98)00336-9" @default.
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