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- W2008050168 abstract "Abstract The nature behind the promotional effect of phosphorus on the catalytic performance and hydrothermal stability of zeolite H‐ZSM‐5 has been studied using a combination of 27 Al and 31 P MAS NMR spectroscopy, soft X‐ray absorption tomography and n ‐hexane catalytic cracking, complemented with NH 3 temperature‐programmed desorption and N 2 physisorption. Phosphated H‐ZSM‐5 retains more acid sites and catalytic cracking activity after steam treatment than its non‐phosphated counterpart, while the selectivity towards propylene is improved. It was established that the stabilization effect is twofold. First, the local framework silico‐aluminophosphate (SAPO) interfaces, which form after phosphatation, are not affected by steam and hold aluminum atoms fixed in the zeolite lattice, preserving the pore structure of zeolite H‐ZSM‐5. Second, the four‐coordinate framework aluminum can be forced into a reversible sixfold coordination by phosphate. These species remain stationary in the framework under hydrothermal conditions as well. Removal of physically coordinated phosphate after steam‐treatment leads to an increase in the number of strong acid sites and increased catalytic activity. We propose that the improved selectivity towards propylene during catalytic cracking can be attributed to local SAPO interfaces located at channel intersections, where they act as impediments in the formation of bulky carbenium ions and therefore suppress the bimolecular cracking mechanism." @default.
- W2008050168 created "2016-06-24" @default.
- W2008050168 creator A5003652967 @default.
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- W2008050168 date "2014-11-04" @default.
- W2008050168 modified "2023-10-18" @default.
- W2008050168 title "Hexane Cracking over Steamed Phosphated Zeolite H-ZSM-5: Promotional Effect on Catalyst Performance and Stability" @default.
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- W2008050168 doi "https://doi.org/10.1002/chem.201404924" @default.
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