Conclusions
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1.
Thermal steam treatment of ZSM zeolites leads to their dealuminization, but the crystal structure is retained.
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2.
When the steam-treatment temperature is increased to 600°C, as a first step aluminum is lost from the cation positions and probably from the locations where it is concentrated in the framework; this leads to a reduction in secondary reactions and hydrogen transfer reactions and, as a result, to an increase in the resistance of the zeolite to coking.
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3.
When the steam-treatment temperature is increased to 600°C, the overall number of active centers falls sharply and hence also the degree of conversion of methanol to hydro-carbons. The active centers which remain are uniform.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 996–1001, May, 1986.
The authors wish to thank V. M. Mastikhin for running the NMR spectra.
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Echevskii, G.V., Nosyreva, G.N. & Ione, K.G. Factors affecting the stability and selectivity of zeolites in the conversion of methanol to hydrocarbons. Communication 1. Effect of heat treatment in steam. Russ Chem Bull 35, 904–909 (1986). https://doi.org/10.1007/BF00955346
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DOI: https://doi.org/10.1007/BF00955346