(64f) Investigation of Chabazite and Other Small-Pore Zeolites in the DME Carbonylation Reaction
AIChE Annual Meeting
2019
2019 AIChE Annual Meeting
Poster Sessions
Poster Session: In Recognition of the 50th Anniversary of ExxonMobil Corporate Strategic Research
Tuesday, November 12, 2019 - 3:30pm to 5:00pm
In this work, we investigated the activity and location of the active site of a small-pore, 8MR-containing zeolite topology, chabazite (CHA). We found that the activity towards MA production orders MOR > CHA > FER for comparable Si/Al (~10), and that CHA-type zeolites (SSZ-13s) synthesized with 5 < Si/Al < 70 exhibit an activity maximum centered near Si/Al = 10 that does not scale with total acid site density. To understand this, we conducted high-spin 1H MAS NMR analyses on dehydrated SSZ-13s and divalent cation-exchange experiments to develop a structure-activity model for the active site in the CHA framework. The promising activity of CHA motivated the investigation of other small-pore, 8MR-containing topologies (e.g., LEV, AEI) as catalysts in the carbonylation of DME. Understanding the origin of activity in these types of frameworks may lead to applications in other carbonylation chemistries of interest.