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- W122787777 abstract "Abstract Four ferrierites and two H-ZSM-5 zeolites were tested in the skeletal isomerization of n-butenes to isobutylene at temperatures from 573 to 773 K. At the same reaction condition the H-ZSM-5 zeolites showed a higher conversion of n-butenes and a lower selectivity to isobutylene than the ferrierites. Even at comparable conversion the selectivitiy was lower for the H-ZSM-5 zeolites. With increasing weight hourly space velocity (decreasing residence time) increasing selectivity to isobutylene and in some cases also increasing yield of isobutylene was observed both on ferrierites and H-ZSM-5 zeolites. Therefore the monomolecular mechanism is proposed for the isomerization of n-butenes to isobutylene on both zeolite types. By-product formation takes place in consecutive reactions by cracking of dimers formed from isobutylene. Using a H-ZSM-5 zeolite with a high Si/Al ratio, decreasing conversion of n-butenes and increasing yield of isobutylene was observed with increasing temperature. Furthermore, a selectivity to isobutylene of 87 % could be reached with this zeolite. This catalytic behaviour is seen as a further evidence for the proposed scheme of consecutive reactions. Since TPAD measurements indicated a higher Broensted acidity for the ferrierites than for the H-ZSM-5 zeolites, it was concluded that the pore size and pore structure affect the catalytic behaviour more strongly than the acidity." @default.
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- W122787777 date "1999-01-01" @default.
- W122787777 modified "2023-09-27" @default.
- W122787777 title "Skeletal Isomerization of n-Butenes to isobutylene on ferrierite and H-ZSM-5 catalysts" @default.
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- W122787777 doi "https://doi.org/10.1016/s0167-2991(99)80289-4" @default.
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