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Tom Hooper


I graduated from the University of Warwick with a first-class honours MPhys Physics degree. After completing my 4th year project in the Solid-state NMR group at Warwick, I have now undertaken a PhD within the department.

The funding for this project is an EPSRC Industrial CASE Award from Johnson Matthey provided via the iMR CDT.

Project Title

The Development of 105Pd Solid State NMR Methodologies for the Multinuclear Solid State NMR Study of Pd Nanoparticle Systems Used in Catalytic Processes 

Project Outline

Palladium metal plays a key role in a wide range of catalytic reactions that have huge societal impact through many fundamental industrial processes. Its use is predominantly based around the vast versatility of the metal and the large number of accessible oxidation states that it possesses, which consequently makes it highly suited to roles in catalytic scenarios involving oxidative reactions (e.g. automotive NOx/SOxcatalysis), hydrogenation and dehydrogenation reactions (e.g. pharmaceutical syntheses), carbon-carbon coupling chemistry (e.g. organic transformations, carbon nanotube formation), and electrochemical transformations (e.g. fuel cells). Unfortunately, the study of the quadrupolar 105Pd nucleus (I = 5/2) using the solid state NMR (SSNMR) technique is hampered by its modest natural abundance (~22%), low gyromagnetic ratio γ (-1.23 x 107 radT-1s-1) and enormous quadrupole moment Q (~66 x 10-30 m2); hence, the field of 105Pd solid state NMR is completely unexplored and methodologies need to be formulated that will assist in the elucidation of meaningful data from the study of this nucleus. However, although still challenging, recent 105Pd solid state NMR studies have demonstrated that Pd metal nanoparticle systems are able to be observed with a large upfield Knight shift of -3.07%, and a fundamental study of different heterogeneous Pd metal-based systems supported on a variety of materials needs to be established. A comprehensive understanding of these systems will be investigated by studying nuclei such as 105Pd, 13C, 27Al and 1H, and these studies will be correlated with important physical factors such as particle size effects, particle shape effects, the influence of the support materials, oxidation state, bimetallic systems, interactions with organic reductants, and mechanisms of catalytic deactivation. In particular, since many Pd nanoparticle systems are stabilised with organic substrates on the surface, the characteristics of this surface interaction can be probed with the DNP (Dynamic Nuclear Polarisation) technique, thus permitting the intrinsic differences between the surface, sub-surface and bulk speciation to be identified. The DNP approaches that will be implemented in this project will focus on sensitivity enhancements achievable from conventional radical sources such as TEMPOL or TOTAPOL, and will also involve an investigation of the feasibility of enhancements being obtained from natural radical sources in the Pd metal.

Teaching

  • I have demonstrated in 3rd year MPhys Physics laboratory sessions (Oct 2013- Dec 2013, Oct 2014- Dec 2014)

Conferences

  • Johnson Matthey Academic Conference (Loughborough University, UK) April 2015....................Poster Presented
  • SMARTER4 (Durham University, UK) Sept 2014..............................................................................Poster Presented
  • CASTEP Workshop (University of Oxford, UK) Aug 2014.................................................................Poster Presented
  • BRSG (University of Nottingham, UK) July 2014
  • NMRDG (University of Nottingham, UK) June 2014
  • iMR CDT (University of Dundee, UK) Apr 2014
  • Johnson Matthey Academic Conference (Loughborough University, UK) April 2014......................Poster Presented
  • 850 MHz Solid-state NMR Facility Annual Symposium (University of Warwick, UK) Apr 2014
  • BRSG Xmas Meeting (IOP London, UK) Dec 2013
  • iMR CDT (University of Warwick, UK) Dec 2013
  • Bruker NMR Users' Meeting (Bruker Coventry, UK) Nov 2013

Contact Details

Department of Physics

University of Warwick

Coventry

CV4 7AL

44 (0)7704870679

t dot hooper at warwick dot ac dot uk