Influence of the Support of Bimetallic Platinum Tungstate Catalysts on 1,3-Propanediol Formation from Glycerol
| Autor: | Jesús Requies, Yaiza Tejido-Núñez, Inaki Gandarias, Pedro L. Arias, Sara García-Fernández |
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| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
Organic Chemistry Inorganic chemistry chemistry.chemical_element 010402 general chemistry Heterogeneous catalysis 01 natural sciences Catalysis 0104 chemical sciences Propanediol Inorganic Chemistry chemistry.chemical_compound Tungstate chemistry Hydrogenolysis Physical and Theoretical Chemistry Platinum Zeolite Bimetallic strip |
| Zdroj: | ChemCatChem. 9:4508-4519 |
| ISSN: | 1867-3880 |
| Popis: | Three aluminium oxide materials and a HZSM-5 zeolite were used as supports of bimetallic Pt-WOx catalysts, in order to establish structure-activity relationships in the glycerol hydrogenolysis reaction. The tungsten surface density and the intimate contact between Pt and WOx showed to be key parameters. Tungsten surface density controls the formation of polytungstates, the only species able to produce the weak Bronsted acidity that is required to selectively produce 1,3-propanediol. The comparison between the HZSM-5 and the Al2O3 supports demonstrated that an increment on the medium Bronsted acidity is detrimental for the selective 1,3-propanediol formation, as it promotes the reactions that yield 1-propanol and propane. Increasing the dispersion of Pt for the Pt/WOx/Al2O3 catalysts led to larger glycerol conversion values, but promoted the hydrogenolysis routes that lead to 1,2 and 1,3-propanediol similarly. On the contrary, increasing the Pt metal content significantly favoured the hydrogenolysis route leading to 1,3-propanediol. A more intimate contact between Pt and WOx promoted the hydrogenation of the intermediate carbocation, formed and stabilized on a polytungstate active site, into 1,3- propanediol. |
| Databáze: | OpenAIRE |
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