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Selective transformation of glycerol into 1,2-propanediol on several Pt/ZnO solids: Further insight into the role and origin of catalyst acidity
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
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2015 (English)In: Catalysis Today, ISSN 0920-5861, E-ISSN 1873-4308, Vol. 257, 246-258 p.Article in journal (Refereed) Published
Abstract [en]

Microemulsion technique allowed us to synthesize different ZnO solids with similar particle sizes and textural properties. Platinum was subsequently incorporated by deposition-precipitation and impregnation methods and solids tested for glycerol selective transformation into 1,2-PDO. Incorporation of platinum led to the creation of new (mainly Lewis) acid sites. A good correlation between conversion and acidity of Pt/ZnO solids was obtained. Interestingly, despite exhibiting some acidity, supports alone were inactive in the process which evidenced the role of the metal in dehydration of glycerol into acetol. Furthermore, as the reaction proceeded some chlorine coming from the precursor (H2PtCl6) was leached which led to the disappearance of the strongest acid sites, associated to side reactions (catalytic cracking) thus resulting in an increase in selectivity to 1,2-PDO. Eventual formation of Pt-Zn alloy upon reduction of the systems at ca. 400 degrees C was beneficial to 1,2-PDO selectivity.

Place, publisher, year, edition, pages
2015. Vol. 257, 246-258 p.
Keyword [en]
Glycerol transformation, Microemulsion technique, Pt/ZnO, 1, 2-Propanediol, Role of acid sites, Effect of chlorine
National Category
Other Chemical Engineering Chemical Process Engineering
Identifiers
URN: urn:nbn:se:kth:diva-175478ISI: 000361629500012Scopus ID: 2-s2.0-84941804950OAI: oai:DiVA.org:kth-175478DiVA: diva2:862523
Note

QC 20151022

Available from: 2015-10-22 Created: 2015-10-16 Last updated: 2017-06-02Bibliographically approved

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