Synthesis Strategies for New Zeolite Catalysts with Diquaternary Ammonium Molecules

2009 Spring Symposium

 
Allen Bur­ton
Chevron Research
Rich­mond, Cal­i­for­nia


Abstract — The zeo­lite com­mu­ni­ty has recent­ly pre­pared a num­ber of new zeo­lite struc­tures byem­ploy­ing diqua­ter­nary ammo­ni­um mol­e­cules as struc­ture direct­ing agents (SDAs). Inpar­tic­u­lar, sev­er­al nov­el mul­ti­di­men­sion­al medi­um-pore zeo­lites have been dis­cov­ered that­pro­vide inter­est­ing com­par­isons with ZSM-5 in their struc­tur­al fea­tures and cat­alyt­ic behaviours.I will first dis­cuss how we have used diqua­ter­nary pyrro­li­dini­um mol­e­cules in flu­o­ride-medi­at­edgels to syn­the­size new zeo­lites like SSZ-74, SSZ-75, and SSZ-83. I will empha­size the struc­turalelu­ci­da­tion and prop­er­ties of SSZ-74, an excep­tion­al zeo­lite that pos­sess­es ordered tetra­he­dral­site vacan­cies. In the sec­ond part of the dis­cus­sion, I will describe how we have pre­pared­di­qua­ter­nary ammo­ni­um mol­e­cules from enam­ine pre­cur­sors. One of these SDA is used topre­pare the nov­el zeo­lite SSZ-82, and sev­er­al of the mol­e­cules are selec­tive for thea­lu­mi­nosil­i­cate and borosil­i­cate ver­sions of the SSZ-26/33 fam­i­ly, which has very few knownS­DA mol­e­cules

Speaker’s Biog­ra­phy — Allen Bur­ton received his BS in Chem­istry at the Uni­ver­si­ty of Mary­land at Col­lege Park, and his PhD in Chem­i­cal Engi­neer­ing from the Uni­ver­si­ty of Delaware under the guid­ance of Prof. Raul Lobo. It was here Allen dis­cov­ered his pas­sion for zeo­lite syn­the­sis, which he con­tin­ued under the post­doc­tor­al guid­ance of Prof Mark Davis at Cal­Tech. In 2001, Allen accept­ed a posi­tion in the research group at Chevron’s Research facil­i­ty in Rich­mond, CA. Despite his admit­ted inep­ti­tude in the game of golf, on week­ends he can some­times be found at the golf range (swear­ing at golf balls and throw­ing his irons).