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Effective zeolite catalysts for the vapor phase Beckmann rearrangement of cyclohexanone oxime have the smaller pore window size than cyclohexanone oxime and have very weak acid sites. Ethanol is useful solvent for cyclohexanone oxime to improve the selectivity for ε-caprolactam formation.
Heterogenous catalysis holds many potentials for replacing the the outdated end-of-pipe strategy by the application of reactor or production integrated environmental protection . Three industrially important reactions employing zeolites as heterogenous catalysts demostrate to which extent high product yields are achieved accompanied by a minimized amount of contaminations. This attainment...
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