首页|A comparative study of the desilication of channel-and cage-like zeolites
A comparative study of the desilication of channel-and cage-like zeolites
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Zeolites are very important catalysts in the chemical industry,but their intrinsic narrow micropore system oft(restricts the mass transport of reactant and product molecules.These mass transport limitations can be overcon by introducing a second larger pore system(meso-/macropores)into the zeolite crystals.Over the past decad desilication of zeolites has emerged as a simple post-synthetic process to implement mesoporosity into zeolite Here we present the investigation of the influence of framework topology on the formation of mesoporosity 1 the desilication process.For this purpose,the desilication behaviour of a channel-like system(ZSM-5/MFI-typ and a cage-like system(SSZ-13/CHA-type)are compared.It has been found that cage-like zeolite(SSZ-13)more susceptible to the desilication process.The desilication of SSZ-13 zeolite resulted in drastic reduction microporosity and crystallinity,while the microporosity and crystallinity of ZSM-5 gradually decreased wi desilication time.By systematically studying the influence of various desilication parameters(e.g.treatme:time,temperature and alkaline concentration),it has been found that there exists a direct correlation betwee the extraction of silicon and mesoporosity formation for the channel-like zeolite(ZSM-5)whereas in case of cag like zeolite(SSZ-13)no direct correlation has been found.
ZeolitesZSM-5SSZ-13Alkaline post treatmentDesilicationHierarchyPore topology
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