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Luter Leke

Speaker for catalysis conferences - Luter Leke

Title: Reaction pathways of methanol oxidation over a supported bimetallic catalyst

Luter Leke

Benue State University, Nigeria

Biography

Luter Leke holds a BSc, Applied Chemistry of the University of Jos, an MSc, Industrial Chemistry of the prestigious University of Ibadan both in Nigeria and a PhD in Chemistry (Catalysis) of the University of Aberdeen, United Kingdom. He lectures chemistry at the Benue State University. Leke holds membership of several professional bodies which include; Institute of Chartered Chemists of Nigerian (ICCON), Chemical Society of Nigeria (C S N), Energy Institute, United Kingdom (E I), American Chemical Society (A C S) and Royal Society of Chemistry (R S C). He has published journal articles and also serves on the editorial board of some journals. He enjoys playing and watching soccer and tennis.

Abstract

The oxidation of methanol was studied over supported monometallic catalysts of copper and silver was studied over the supported bimetallics of the two metals over a range of temperature and contact times. This was done to ascertain the effect the bimetallics will have on the reaction pathways and subsequently on the product distribution of the oxidation products of this reaction owing to the enormous contributions the bimetallics have brought to the world of heterogeneous catalysis. Characterisation was performed by nitrogen adsorption and porosity measurements, XRD, and IR spectroscopy of adsorbed methanol and of adsorbed CO. These results indicated no crystalline phases of the loaded metals to be present. CO adsorption showed the presence of small cluster metal atoms on the surface of the catalysts. The reduction peaks from TPR studies also revealed the presence of partially oxidised and dispersed metal atoms. Infra-red studies of methanol adsorbed on these sample catalysts revealed the presence of intermediate methoxy and formate species which have been reported to be formed in the course of the reactions. Silica as a support employed for its good thermal stability, fairly chemical inertness and surface areas as well as alumina, also a known for the aforementioned attributes and also its higher acidity were impregnated with the metal salts under investigation in both their mono and bimetallic forms. The bimetallic copper-silver interaction in the bimetallic was proposed to enhance the reduction of the silver that enhanced the selectivity to formaldehyde. Low conversions of methanol saw highest selectivities to formaldehyde. There was also a very pronounced effect of the supports on product distribution and activities with the alumina based samples being more active than the silica supported ones, with the product distributions on the alumina supported significantly showing high yields of DME while the silica showed high yield for methyl formate with COx and CH4 detected in very small quantities on all the catalysts within the parameters investigated.