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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Dual-site mediated hydrogenation catalysis on Pd/NiO: selective biomass transformation and maintaining catalytic activity at low Pd loading Sebastiano Campisi , Carine E. Chan-Thaw , Lidia E. Chinchilla , Arunabhiram Chutia , Gianluigi A. Botton , Khaled M. H. Mohammed , Nikolaos Dimitratos , Peter Wells , Alberto Villa Acs Catalysis DOI: 10.1021/acscatal.0c00414 Diamond Proposal Number(s): [10306] Open Access Show Abstract ▼ Abstract: Creating a new chemical ecosystem based on platform chemicals derived from waste biomass has significant challenges; catalysts need to be able to convert these highly functionalised molecules to specific target chemicals, economical – not relying on large quantities of precious metals - and maintain activity over many cycles. Herein, we demonstrate how Pd/NiO is able to direct the selectivity of furfural hydrogenation and maintain performance at low Pd loading by a unique dual-site mechanism. Sol-immobilization was used to prepare 1 wt% Pd nanoparticles supported on NiO and TiO2, with the Pd/NiO catalyst showing enhanced activity with a significantly different selectivity profile; Pd/NiO favours tetrahydrofurfuryl alcohol (72%), whereas Pd/TiO2 produces furfuryl alcohol as the major product (68%). Density functional theory studies evidenced significant differences on the adsorption of furfural on both NiO and Pd surfaces. Based on this observation we hypothesised that the role of Pd was to dissociate hydrogen, with the NiO surface adsorbing furfural. This dual-site hydrogenation mechanism was supported by comparing the performance of 0.1 wt% Pd/NiO and 0.1 wt% Pd/TiO2. In this study, the 0.1 and 1 wt% Pd/NiO catalysts had a comparable activity, whereas there was a 10 fold reduction in performance for 0.1 wt.% Pd/TiO2. When using TiO2 as the support the Pd nanoparticles are responsible for both hydrogen dissociation and furfural adsorption, and the activity is strongly correlated with the effective metal surface area. This work has significant implications for the upgrading of bio-derived feedstocks, suggesting alternative ways for promoting selective transformations and reducing the reliance on precious metals.	Apr 2020

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B18-Core EXAFS

Dual-site mediated hydrogenation catalysis on Pd/NiO: selective biomass transformation and maintaining catalytic activity at low Pd loading

Sebastiano Campisi , Carine E. Chan-Thaw , Lidia E. Chinchilla , Arunabhiram Chutia , Gianluigi A. Botton , Khaled M. H. Mohammed , Nikolaos Dimitratos , Peter Wells , Alberto Villa

Acs Catalysis

DOI: 10.1021/acscatal.0c00414

Diamond Proposal Number(s): [10306]