Composition-Reactivity Correlations in Platinum-Cobalt Nanoporous Network as Catalyst for Hydrodeoxygenation of 5-Hydroxymethylfurfural

Mazal Carmiel-Kostan, Sally Nijem, Shahar Dery, Gal Horesh, Elad Gross*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Identifying the influence of atomic order on the catalytic reactivity of bimetallic catalysts is essential for their rational design. However, the synthesis of atomically ordered nanostructures under mild conditions is not trivial, and in many cases a mixture of various compositions is formed. Here we show a simple and highly versatile approach for synthesis of Pt-Co bimetallic nanoporous network (BNN) and demonstrate the influence of preparation conditions on the BNN's atomic order and catalytic reactivity. High surface area Pt3Co BNN was prepared by reduction of [Co(NH3)5Cl][PtCl4] double complex salt crystals. The BNN phase was transformed from Pt3Co to segregated Pt and Co domains once the reduction temperature of the double complex salt crystals was elevated. High selectivity toward hydrodeoxygenation of biomass-derived 5-hydroxymethylfurfural to 2,5-dimethylfuran was obtained while catalyzing the reaction with Pt3Co BNN. The catalytic yield was deteriorated by more than an order of magnitude while catalyzing the reaction with BNN that was constructed of segregated Pt and Co domains. Spectroscopic analysis identified the presence of an oxidized Co species and a metallic Pt species in a close to 1:1 ratio on the Pt3Co BNN surface as crucial factors in lowering the activation energy of the dehydration reaction.

Original languageAmerican English
Pages (from-to)30274-30282
Number of pages9
JournalJournal of Physical Chemistry C
Volume123
Issue number50
DOIs
StatePublished - 19 Dec 2019

Bibliographical note

Publisher Copyright:
Copyright © 2019 American Chemical Society.

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