Effect of calcium oxide on pyrolysis of coal in a fluidized bed

Effect of CaO on tar reforming to hydrogen-enriched gas with in-process CO2 capture in a bubbling fluidized bed biomass steam gasifier

“…7). The possible reason could be the reaction between CaO and the primary products abundant with condensed aromatic compounds which are produced in pyrolysis step [47]. The O 2À ions which form the active sites on CaO have spatially diffuse electron clouds which can overlap with the orbitals of the incoming molecules and disrupt the stability of the p-electron cloud of tar compounds destabilizing their aromatic rings and leading to ring splitting [20,47e49].…”

Microwave pyrolysis of sewage sludge: analysis of the gas fraction

“…As mentioned in the experimental section, sludge B was stabilized by the addition of lime, which is reflected in the much higher CaO content of this sludge ( Table 2). The catalytic effect of calcium oxide in the pyrolysis of carbonaceous materials was studied in a previous work [37], where it was concluded that CaO catalyses secondary cracking reactions of volatiles, causing an increase in the gas fraction at the expense of the oil fraction and an increase in the production of H 2 . Moreover, CaO has been used as an adsorbent of carbon dioxide in new H 2 production methods during coal gasification [38].…”

Effect of coal treatment with molten blast furnace slag on char properties

“…Catalytic effect of CaO additives on the coal pyrolysis, followed by the increased gas yield and formation of more porous char, is reported in the literature. [6][7][8] High calcium oxide blast furnace slag was used in the present study; therefore, its catalytic effect on the conversion of coal and char properties can be assumed.…”