Acid Sites of Phosphorus-Modified ZeosilsClick to copy article linkArticle link copied!
- Gaurav KumarGaurav KumarDepartment of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United StatesMore by Gaurav Kumar
- Limin RenLimin RenDepartment of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United StatesCatalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United StatesMore by Limin Ren
- Yutong PangYutong PangDepartment of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United StatesMore by Yutong Pang
- Xinyu LiXinyu LiDepartment of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United StatesMore by Xinyu Li
- Han ChenHan ChenDepartment of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United StatesMore by Han Chen
- Jason GulbinskiJason GulbinskiDepartment of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United StatesMore by Jason Gulbinski
- Paul J. DauenhauerPaul J. DauenhauerDepartment of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United StatesCatalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United StatesMore by Paul J. Dauenhauer
- Michael TsapatsisMichael TsapatsisDepartment of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United StatesDepartment of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United StatesApplied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, Maryland 20723, United StatesCatalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United StatesMore by Michael Tsapatsis
- Omar A. Abdelrahman*Omar A. Abdelrahman*Email: [email protected]Department of Chemical Engineering, University of Massachusetts Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003, United StatesCatalysis Center for Energy Innovation, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United StatesMore by Omar A. Abdelrahman
Abstract
The acid sites of phosphorus-containing zeosils were probed through a combination of solid acid characterization, density functional theory calculations, and kinetic interrogations, establishing their weakly Brønsted-acidic character. Because of the disparity in the acid-site strength, P-zeosils catalyzed the probe chemistry of isopropanol dehydration slower than aluminosilicate zeolites by an order of magnitude on an active-site basis. Propene selectivity during isopropanol dehydration remained 20–30% higher than that of aluminosilicates, illustrating the distinct nature of the weakly acidic phosphorus active sites that favored unimolecular dehydration routes. Regardless of the confining siliceous environment, the nature of phosphorus active sites was unchanged, as indicated by the identical apparent uni- and bimolecular dehydration energy barriers. Kinetic isotope experiments with deuterated isopropanol feeds implicated an E2-type elimination in propene formation on phosphorus-containing materials. The comparison of kinetic isotope effects between phosphorus-containing zeosils and aluminosilicates pointed to an unchanged isopropanol dehydration mechanism, with changes in the apparent energetic barriers attributed to weaker binding on phosphorus-active sites that lead to a relatively destabilized alcohol dimer adsorbate. Both ex situ alkylamine Hofmann elimination and in situ pyridine titration characterization methods exhibited a phosphorous acid site count that was dependent on the probe molecules’ identity or concentration, underpinning the limitations of extending common characterization techniques for Brønsted acid catalysis to weakly acidic materials.
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