Abstract
Mono and bimetallic catalysts based on Pt and Pd were prepared by a co-precipitation method. They were tested in liquid phase hydrogenation reactions of glucose and furfural at low temperature and pressure. The bimetallic PtPd/TiO2 catalyst proved to be an efficient material in selectively hydrogenating glucose to sorbitol. Moreover, high furfural conversion was attained under relatively soft conditions, and the furfuryl alcohol selectivity was strongly affected by the chemical composition of the catalysts. Furfuryl alcohol (FA) was the major product in most cases, along with side products such as methylfuran (MF), furan, and traces of tetrahydrofuran (THF). These results showed that the PtPd bimetallic sample was more active relative to the monometallic counterparts. A correlation between the catalytic results and the physicochemical properties of the supported nanoparticles identified key factors responsible for the synergetic behavior of the PtPd system. The high activity and selectivity were due to the formation of ultra-small particles, alloy formation, and the Pt-rich surface composition of the bimetallic particles supported on the TiO2 nanowires.
Highlights
In recent decades, the conversion of biomass raw materials to platform molecules has gained interest, as it is one of the most promising routes for the sustainable production of bio-fuels and bio-chemicals [1,2,3,4,5]
It was shown that the bimetallic Pt0.50 Pd0.50 /TiO2 catalyst is a very efficient material for low-pressure hydrogenation of glucose and furfural reactions
A correlation between the catalytic results obtained and the physicochemical properties of the supported nanoparticles allowed for the identification of key factors responsible for the synergetic behavior of the PtPd system
Summary
The conversion of biomass raw materials to platform molecules has gained interest, as it is one of the most promising routes for the sustainable production of bio-fuels and bio-chemicals [1,2,3,4,5]. Furfural and glucose are considered as important biomass-derived compounds among the platform molecules, as they are the source of top most value-added chemicals like sorbitol and furfuryl alcohol, respectively [1,6,7]. Furfuryl alcohol is considered as a potential source to produce alkane components in liquid biofuels, and its derivatives have wide applications in the plastics, pharmaceuticals, food, and agrochemical industries [1,8,9,10]. Nickel- and ruthenium-based catalytic systems are commercially favored because of their excellent activities in addition to their lower costs compared to other noble metal catalysts. The Ni catalysts exhibit deactivation due to metal leaching, sintering, and active site poisoning, and the
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