Presentation Title

A Study of Molybdenum Catalysts for Deoxydehydration of Vicinal Diols

Faculty Mentor

Alex John

Start Date

18-11-2017 11:30 AM

End Date

18-11-2017 11:45 AM

Location

9-263

Session

Physical Sciences 3

Type of Presentation

Oral Talk

Subject Area

physical_mathematical_sciences

Abstract

Fossil resources are getting increasingly scarce in today’s society and a new form of renewable matter is now more desirable than ever. One viable form of renewable matter can be derived from biomass. We are looking into deoxydehydration (DODH) reactions in order to develop a way to derive renewable matter from biomass. This reaction eliminates vicinal diols and creates a carbon-carbon double bond instead. Rhenium has been proven to work well in DODH reactions, however, it is a very scarce and expensive resource. Therefore, we are researching the properties of Molybdenum catalysts for DODH reactions. Although Molybdenum is not as effective as Rhenium, it is much more affordable to use. By utilizing molybdenum catalysts for deoxydehydration (DODH) reactions, we are developing a way to convert certain plant matter such as cellulose into petroleum hydrocarbons. By exploring the potential of molybdenum complexes supported over ancillary ligands, we can understand ligand effects on DODH reactivity. Our efforts in this direction using tripodal amine bisphenolate ligands will be discussed.

Summary of research results to be presented

To begin with, we have synthesized several tetradentate ligands by Mannich condensation. The first ligand was created by Mannich condensation of 2-aminomethylpyridine and 2-tert-butyl-4-methylphenol. However, this ligand performed poorly in the DODH reaction, yielding only 1% styrene. To better understand the ligand properties, we made modifications to the structure and evaluated those effects in DODH reactions. The next two complex were obtained by removing one of the phenolate arms and the pyridyl donor. By making these changes, we obtained improved styrene yields of 10 and 30% respectively. So far, we have experimented with, in total, four different molybdenum complexes, at 10 molar percent. After modification of one of these variables at a time, we are able to observe their individual effects on DODH reactivity and we have seen improved styrene yields of up to 30%. So far, by using 1-phenyl, 1-2 ethanediol as the substrate and triphenylphosphene as the reductant, we had varying styrene yields of up to 30% on a 10 mol% complex scale.

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Nov 18th, 11:30 AM Nov 18th, 11:45 AM

A Study of Molybdenum Catalysts for Deoxydehydration of Vicinal Diols

9-263

Fossil resources are getting increasingly scarce in today’s society and a new form of renewable matter is now more desirable than ever. One viable form of renewable matter can be derived from biomass. We are looking into deoxydehydration (DODH) reactions in order to develop a way to derive renewable matter from biomass. This reaction eliminates vicinal diols and creates a carbon-carbon double bond instead. Rhenium has been proven to work well in DODH reactions, however, it is a very scarce and expensive resource. Therefore, we are researching the properties of Molybdenum catalysts for DODH reactions. Although Molybdenum is not as effective as Rhenium, it is much more affordable to use. By utilizing molybdenum catalysts for deoxydehydration (DODH) reactions, we are developing a way to convert certain plant matter such as cellulose into petroleum hydrocarbons. By exploring the potential of molybdenum complexes supported over ancillary ligands, we can understand ligand effects on DODH reactivity. Our efforts in this direction using tripodal amine bisphenolate ligands will be discussed.