The challenge in biomass pyrolysis is to produce bio-oil of high quality either at source prior to full production or by upgrading the product. There are several methods of upgrading and improving bio-oil quality and one of these is the addition of catalysts into the pyrolysis process. The catalysts are expected to enhance the crack-ing reactions of the heavy molecules in pyrolysis products leading to the production of less viscous bio-oil and to induce reactions involving the removal of reactive oxygenated species, leading to the production of bio-oil of higher heating values and better stability. In catalytic pyrolysis there are various ways of incorporating catalyst to upgrade the pyrolysis vapours and hence the bio-oil produced. In situ catalytic upgrading of biomass pyrolysis vapours by close-coupling the primary and secondary catalytic reactor is a promising route. The advantage of having such reactor configuration is that the reactor conditions can be independently controlled. Other configurations include co-feeding the biomass and catalyst in the same reactor, substitution of fluidising medium and close-couplingin-bed catalyst .