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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Influence of surface functionalities on Au/C catalysts for oxidative homocoupling of phenylboronic acid Tanja E. Parmentier , Anna Lazaridou , Joseph Cartwright , Ben Davies , Simon Dawson , Grazia Malta , Simon Freakley , Thomas E. Davies , David J. Morgan , Simon Kondrat , Christopher J. Kiely , Samuel Pattisson , Nicholas F. Dummer , Graham J. Hutchings Acs Sustainable Chemistry & Engineering 55 DOI: 10.1021/acssuschemeng.5c02262 Diamond Proposal Number(s): [15151] Open Access Show Abstract ▼ Abstract: The formation of C–C bonds through coupling reactions is an important industrial process. The ability of Au to catalyze such reactions has been reported, with both homogeneous and heterogeneous catalyst examples. Previous work has shown that carbon-supported cationic and nanoparticulate Au are active for the homocoupling of phenylboronic acid to biphenyl. However, the stability of supported cationic Au is short-lived, and the formed nanoparticles were suggested to be the active species. Through the synthesis of two types of supported cationic Au catalysts, utilizing either aqua regia or acetone solvents, we show that both catalysts develop nanoparticulate Au species early in the reaction; however, only the aqua regia prepared catalyst is active. We ascribe the activity of the aqua regia prepared Au catalyst to excess Cl and the presence of C–Cl surface species in combination with Au. Carbon treated with aqua regia was inactive; however, when used as a support for Au deposited with acetone or via a sol immobilization method, activity was comparable to the aqua regia prepared catalyst. The role of C–Cl and Au nanoparticles is discussed with respect to their correlation to the biphenyl yield, which is shown to be significant only when the C–Cl species are present on the catalyst.	Jun 2025
E01-JEM ARM 200CF	CO2 hydrogenation to methanol on intermetallic PdGa and PdIn catalysts and the effect of Zn co-deposition Naomi Lawes , Nicholas F. Dummer , Samantha Fagan , Oskar Wielgosz , Isla E. Gow , Louise R. Smith , Thomas J. A. Slater , Thomas Davies , Kieran J. Aggett , David J. Morgan , Stuart H. Taylor , Graham J. Hutchings , Michael Bowker Applied Catalysis A: General 11 DOI: 10.1016/j.apcata.2024.119735 Diamond Proposal Number(s): [27530, 31044] Open Access Show Abstract ▼ Abstract: The behaviour of Pd deposited on Ga2O3 and In2O3 by CVI is compared for the hydrogenation of CO2 to methanol. Ga2O3 alone is inactive, but In2O3 has good conversion, and selectivity as high as 89% to CH3OH. The addition of Pd to the catalysts had relatively little effect for In2O3, but in contrast, the addition of Pd to Ga2O3, has a very big effect, inducing high activity and selectivity to methanol. Both oxides form Pd intermetallics - Pd2In3 and Pd2Ga. However, for the In catalysts there is also a thick (~3 nm) overlayer of the oxide, while for the Ga catalyst there was no such overlayer. Hence this is why addition of Pd to the Indium catalysts has relatively little effect on performance compared with Ga. Furthermore, the effect of Pd and Zn co-deposition on Ga₂O₃ and In₂O₃ was investigated, as well as the effect of the support morphology. Upon co-deposition of Pd and Zn, and after reduction, the Pd2In3 catalyst remains phase stable, whereas the Pd2Ga alloy is replaced by PdZn, and is improved in methanol yield.	Apr 2024

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