Abstract
The chemistry of methanol-to-hydrocarbon conversion over H-ZSM-23, H-SAPO-11 and H-SAPO-5 was studied using solid-state NMR and gas chromatography. The first hydrocarbons observed in the very early stages of the reaction were either C1 and C2 or C1–C4, depending upon loading. The various selectivities of SAPO-5 for hydrocarbon products are considered to be related to the stability of isobutyl cation intermediate and the loadings of the catalyst. The formation of higher carbon number products for SAPO-11 is caused by the lower reactivity of the active centres for cracking reactions. To gain a better understanding of the intermediates involved in the conversion reaction, premethylated samples were treated with hydrogen and dimethyl sulfide.
Published Version
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