Hierarchically structured monolithic silicalite-1 consisting of crystallized nanoparticles and its performance in the Beckmann rearrangement of cyclohexanone oxime.
In this study, we present a synthetic pathway for the fabrication of self-supporting zeolite monoliths consisting of crystallized nanoparticles. A resorcinol-formaldehyde-based organic aerogel is used as a template, and silicalite-1 is used as the zeolite example. The silicalite-1 monoliths obtained consist of individual well-defined zeolite nanocrystals with sizes of 30-40 nm. The monoliths exhibit a high mechanical stability and have hierarchical porosity, with micropores within the zeolite particles, a mesopore system formed by the packing of the nanoparticles, and a macropore system on the monolith level. Such monolithic zeolites show high selectivity typically above 80% to epsilon-caprolactam combined with a high rate of reaction of 0.46 g(caprolactame)/(g(catalyst).h) in the Beckmann rearrangement of cyclohexanone oxime.
Li
Wen-Cui
WC
Contribution from the Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany.
Lu
An-Hui
AH
Palkovits
Regina
R
Schmidt
Wolfgang
W
Spliethoff
Bernd
B
Schüth
Ferdi
F
D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D003460:Crystallization; D003512:Cyclohexanones / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D017640:Silicates / Q000138:chemical synthesis*; D017641:Zeolites / Q000138:chemical synthesis*
D003512:Cyclohexanones; D017640:Silicates; D017641:Zeolites; C044686:cyclohexanone oxime; D002244:Carbon