Claire Courson

Experimental study of the SO2 removal over a NOx trap catalyst

The NOx storage capacity of a NOx trap catalyst is affected by SO2 poisoning. When the extent of poisoning is low (less than 30% of BaO involved in sulphate formation), it is possible to regenerate the catalyst under reducing conditions and the initial storage capacity can be recovered, even in the presence of some remaining sulphates. When the extent of poisoning is very high, it is more difficult to regenerate the material and the initial NOx storage capacity cannot be recovered, even after long regeneration duration.

Modified dolomite in biomass gasification with simultaneous tar reformation and CO2 capture: effect of metal loading

The CO2 absorption capacity of calcined dolomite [a (CaMg)O solid solution] doped with iron and nickel transition metals has been investigated in a fixed bed reactor operating at temperature conditions (650?C) at which the sorption process is thermodynamically favoured at ambient pressure. The presence of metals (catalytic sites) between CaO grains (CO2 absorption sites) may improve the potential of dolomite for the simultaneous process of catalytic tar reforming and CO2 capture in biomass gasification, with the aim of developing an effective combined catalyst and sorbent particle. It was found that iron and nickel may be optimised in the substrate reducing critical limitations on CO2 capture capacity. A Sorption Enhanced Reforming test is proposed, at 650?C, for both iron and nickel doped calcined dolomite, using toluene as model tar compound: iron has been found to be not active in such conditions, whereas the 4% Ni/(CaMg)O has been indicated as the most suitable combined catalyst and sorbent particle.

Iron based catalyst for hydrocarbons catalytic reforming: A metal-support interaction study to interpret reactivity data

Abstract The addition of iron, a cheap and non toxic metal, to the natural minerals dolomite and related materials, CaO and MgO, has been investigated for biomass gasification applications. The Fe/CaO, Fe/MgO and Fe/dolomite systems have been prepared by impregnation following two preparation methods to generate Fe (+2) and/or Fe (+3) species, and carefully characterized. The improvement on tar conversion of CaO, MgO and dolomite by adding iron, has been investigated by using toluene as model tar compound in a microreactor rig.