Search Results

You searched for all publications:

with publication states 'Published (Approved)'

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

Exact matches
Related results

3 items found (0 items not approved), displaying all items.1

Instruments / Technical Area	Publication Details	Published
E01-JEM ARM 200CF	Molecular nitrogen promotes catalytic hydrodeoxygenation Haohong Duan , Jin-cheng Liu , Ming Xu , Yufei Zhao , Xue-lu Ma , Juncai Dong , Xusheng Zheng , Jianwei Zheng , Christopher Allen , Mohsen Danaie , Yung-kang Peng , Titipong Issariyakul , Dongliang Chen , Angus Kirkland , Jean-charles Buffet , Jun Li , Shik Chi Edman Tsang , Dermot O'hare Nature Catalysis 345 DOI: 10.1038/s41929-019-0368-6 Diamond Proposal Number(s): [16969, 17397] Show Abstract ▼ Abstract: Although molecular dinitrogen (N2) is widely used as a carrier or inert gas for many catalytic reactions, it is rarely considered as a catalytic promoter. Here, we report that N2 could be used to reduce the activation energy for catalytic hydrodeoxygenation over ruthenium-based catalysts. Specifically, we report a 4.3-fold activity increase in the catalytic hydrodeoxygenation of p-cresol to toluene over a titanium oxide supported ruthenium catalyst (Ru/TiO2) by simply introducing 6 bar N2 under batch conditions at 160 °C and 1 bar hydrogen. Detailed investigations indicate that N2 can be adsorbed and activated on the metallic ruthenium surface to form hydrogenated nitrogen species, which offer protic hydrogen to lower the activation energy of direct carbonaromatic–oxygen bond scission and the hydrogenation of hydroxy groups. Thus, by employing different ruthenium catalysts, including Ru/TiO2, Ru/Al2O3, Ru/ZrO2 and Ru/C, we demonstrate that N2 promotion of hydrodeoxygenation can be regarded as a general strategy.	Oct 2019
B18-Core EXAFS	Zirconium arene triple-decker sandwich complexes: Synthesis, electronic structure and bonding Alexander F. R. Kilpatrick , Jennifer Green , Zoe Turner , Jean-charles Buffet , Dermot O'hare Chem. Commun. DOI: 10.1039/C7CC07083G Diamond Proposal Number(s): [15150, 15521] Show Abstract ▼ Abstract: Reduction of a permethylpentalene zirconium(IV) chloride complex [η8-PnZr(μ-Cl)3/2]2(μ-Cl)2Li·THFx with KC8 in benzene results in activation of the aromatic solvent to yield an “inverted sandwich” complex, [η8-PnZr]2(μ-η6:η6-C6H6) (1). The analogous reactions in toluene, cumene, o-xylene and m-xylene also yield analogous solvent activated triple-decker sandwich complexes, which have been structurally characterised by single-crystal X-ray diffraction. Edge energies in the Zr K-edge XANES spectra are not distinguishable between 1 and formally Zr(II) and Zr(IV) reference compounds, suggesting a broad edge structure. DFT calculations best describe the bonding in 1 as highly covalent with frontier molecular orbitals showing almost equal contributions from benzene and the Zr-permethylpentalene fragments.	Oct 2017
B18-Core EXAFS	Highly tuneable catalyst supports for single-site ethylene polymerization Jean Charles Buffet , Nidwaree Wanna , Thomas A Q Arnold , Emma Gibson , Peter Wells , Qiang Wang , Jonggol Tantirungrotechai , Dermot O'hare Chemistry of Materials DOI: 10.1021/cm503433q Diamond Proposal Number(s): [8071] Open Access Show Abstract ▼ Abstract: A new class of tuneable crystalline solid supports for metal complexes have been synthesised and used for ethylene polymerization. We have developed a family of high surface area, highly dispersible layered double hydroxides (AMO-LDHs) which, on treatment with alkyl aluminum activators, are able to support metallocene and non-metallocene complexes to make active catalyst systems for the slurry polymerization of ethylene. We show that the chemical composition of the AMO-LDH support can dramatically affect catalyst activity, polymer morphology, and polymer microstructure. A Zr K-edge EXAFS study of these active catalysts has enabled us to observe a metallocene-derived single-center catalytic species in close proximity to the support.	Feb 2015

Publications Database

Search Results

You searched for all publications:

Search Again...

Subject Areas (check all that apply) select all

Instruments used to collect data (check all that apply) select all

Collaborations involved (check all that apply) select all

Diamond Offline Facilities used

Relevant Technical Areas (check all that apply) select all

Menu for Anonymous User