Abstract
Zeolite/mesoporous silica composite microspheres (ZMMS) have been prepared by self-assembling mesoporous silica phase with Y or Ti-MWW zeolites crystallites in a simple microemulsion system. The synthesis process involved the formation of a stable O/W microemulsion from silica precursor of tetrabutyl orthosilicate and cationic quaternary ammonium surfactants as well as a simultaneous assembling of zeolite into the oil phase by their hydrophobic interaction, in which mesoporous silica was formed by self-assembling of surfactant and silica source. Through optimizing synthesis conditions, the ZMMS materials were prepared to possess controllable mass ratio of zeolite to mesoporous silica (0—2.3) and sphere diameter (186—965 μm). The mesopore sizes of the ZMMSs were 3.75 (zeolite-Y/MMSs) and 3.98 nm (Ti-MWW/MMSs). In the liquid-phase ammoximation of cyclohexanone, Ti-MWW/mesoporous silica microspheres showed a high mechanical stability and a catalytic activity comparable to the parent Ti-MWW powders. Keywords zeolite microsphere; micro/mesoporous composite; microemulsion; zeolite-Y; Ti-MWW
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