(344b) Novel Approach for the Delamination of the Zeolite MCM-22
- Conference: AIChE Annual Meeting
- Year: 2020
- Proceeding: 2020 Virtual AIChE Annual Meeting
- Group: Catalysis and Reaction Engineering Division
- Time: Friday, November 20, 2020 - 8:00am-9:00am
To improve catalyst production at scale, it would be beneficial to develop easier and less costly methods for preparing hierarchical zeolites. One particularly interesting candidate is the delaminated zeolite ITQ-2. This hierarchical zeolite is traditionally prepared by synthesizing a layered precursor (MCM-22), which is then swollen using surfactants, kept under reflux for several hours, and sonicated in a pH monitored solution. This results in thin sheets of zeolite, only a few unit cells thick, which then stack against each other in a random arrangement creating mesopores in the delaminated ITQ-2 structure. While this method has been shown to be effective at lab scale, commercial production of delaminated zeolites would be improved with shorter processing time and fewer chemicals. In this work, we present a simplified method for producing delaminated MCM-22 without harsh post-synthesis treatments. These materials demonstrate comparable physical properties to traditionally delaminated ITQ-2 without significant loss of acid sites. They also show improved activity for the cracking of propylphenol to phenol and propylene. In addition, the rate of deactivation by coking is reduced because the diffusional path remains available longer as coke deposits accumulate. By further developing this technology, it may be possible to create other delaminated zeolites without the use of expensive treatments.