Dr Jennifer Edwards

Dr Jennifer Edwards

Research Fellow

School of Chemistry

Email:
edwardsjk@cardiff.ac.uk
Telephone:
+44 (0)29 2087 9398
Fax:
+44 (0)29 2087 4030

Developing new preparative methodologies to produce highly active heterogeneous nanoalloyed precious metal catalysts. Application of these catalysts for a number of catalytic transformations including:

  • Selective hydrogenation
  • Selective oxidation
  • Fossil fuel free synthesis of platform chemicals
  • CO2 utilisation

For more information, click on the 'Research' tab above.

Links

Research Group: Cardiff Catalysis Institute

BSc in Chemistry with Biological Science in 2003. PhD in heterogeneous catalysis (2006) with Professor Graham Hutchings, FRS (Direct Synthesis of Hydrogen Peroxide using Catalysts containing Gold) post doctoral research associate in Cardiff Catalysis Institute 2007-2012. JSPS fellowship at Tokyo Metropolitan University with Professor Haruta, 2010. Chancellor's research fellowship awarded 2013 (Cardiff Catalysis Institute, Cardiff University School of Chemistry).

Honours and awards

Carol Tyler Award, International Precious Metal Institute, 2011

Clara Immerwahr award, UniCat (Germany), 2013

2018

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2005

  • CH2306 Application of research methods
  • CHT225 Practical Catalytic Chemistry

The heterogeneous oxidation of hydrocarbons is of fundamental interest in the production of fine chemicals. When molecular oxygen is used as the oxidant, harsh reaction conditions tend to be employed - typically high temperature and pressure. Today the concept of green chemistry and sustainability is a key consideration and processes are required that can effectively utilise raw materials, reduce waste and avoid the use of toxic intermediates under mild reaction conditions. The discovery that finely dispersed Au nanoparticles are exceptionally active for CO oxidation at sub ambient temperatures was followed by the successful utilisation of Au catalysts for a wide range of highly selective, clean oxidation reactions which operate under very mild conditions. Typically, these catalysts contain high concentrations of Au (2.5-5 wt%). My previous research on the direct synthesis of H2O -2 demonstrated for the first time that "clean" halide/acid free) H2O2 can be generated when a 5 wt% AuPd catalyst is used.

Figure 1 Scanning transmission electron microscopy images of supported AuPd nanocrystals on metal oxide and activated carbon supports. For TiO2 and Al2O3 supports (red) the nanocrystals show a coreshell morphology with the Au rich core (blue) surrounded by a Pd rich shell (green). On activated carbon (red) the nanocrystal shows a homogeneous alloy composition

When the AuPd catalyst is supported on activated carbon, H2 selectivity and synthesis rates are extremely high, ~98% and 160mol.kgcat-1.h-1 respectively, with initial rates even higher (~900 mol.kgcat-1.h-1 ). Whilst the activity of this catalyst is high, the active site on the catalyst surface has not been clearly identified and the presence of a trimodal particle size distribution suggests that not all of the metal present (5 wt%) is active. Precious metals are an expensive, finite resource and it is important that catalysts utilising these materials do not contain inactive, spectator species. I am interesting in developing catalysts which contain far less precious metal than those typically employed, and where all the metal present is participating in the catalytic reaction. The applications for these materials include:

Selective hydrogenation and hydrogenolysis

Selective oxidation and epoxidation

Utilisation of bio renewable feedstocks

Fossil fuel free synthesis of platform chemicals

CO2 utilisation

Analysis of these materials by computational studies and in depth characterisation will allow fundamental insight into the structure of the active site and will help elucidate reaction mechanisms. In turn this information will be used to formulate supported nanostructures which are reaction (hydrogenation, hydrogenolysis, (ep)oxidation) specific.