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The catalytic role of the hydrocarbon pool formed during the conversion of methanol on zeolite H-ZSM-5 was investigated by in situ MAS NMR spectroscopy under continuous-flow (CF) conditions and by changing of the methanol feed from 13CH3OH to 12CH3OH under steady state conditions. Utilizing this experimental approach, a decrease of the 13C CF MAS NMR signals of alkyl groups bound at the olefinic and...
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