1,721,014 research outputs found
Catalytic partial oxidation of methane to syngas over a peovskite catalyst in a fluidised bed reactor
No full textHydrogen production by biomass gasification in a fluidized bed reactor and catalytic conversion of methane
No full textIron based catalyst for hydrocarbons catalytic reforming: A metal-support interaction study to interpret reactivity data
No full textSteam-gasification of biomass in a fluidised-bed of olivine particles
No full textNaturally occurring catalytic substances are employed in biomass steam-gasification processes to enhance the yield of fuel gas and reduce its tar content by cracking and reforming the high molecular weight organic components. Calcined dolomite is widely used for this purpose; it exhibits good catalytic activity under the operating conditions of the gasifier. However, due to its poor mechanical strength, it gives rise to a large production of fines in a fluidised-bed environment. This work reports an investigation into the catalytic behaviour of olivine, a common, naturally occurring mineral containing magnesium, iron oxides and silica: iron is known to play a positive role in tar decomposition reactions. The gasification runs, performed with a laboratory scale, biomass gasification unit, show that the olivine activity is close to that exhibited by dolomite under comparable operating conditions. Olivine has the additional advantage, however, that its resistance to attrition in the fluidised bed is much greater, similar to that of sand. Parametric sensitivity studies of a gasification process, utilising olivine as the fluidised-bed inventory, indicate an optimum gasification temperature of just above 800 degreesC, and little influence of the steam/biomass ratio in the range 0.5-1. (C) 2000 Elsevier Science Ltd. All rights reserved
Iron and Nickel Doped Alkaline-Earth Catalysts for Biomass Gasification with Simultaneous Tar Reformation and CO2 Capture
No full textThe tar reforming catalytic activity of iron and nickel based catalysts supported on alkaline- earth oxides CaO, MgO and calcined dolomite [a (CaMg)O solid solution] has been investigated in a fixed bed reactor operating at temperatures ranging from 650 to 850 °C; toluene and 1-methyl naphthalene were used as model compounds for tar generated during biomass gasification. The CO2 absorption capacities of Fe/(CaMg)O and Ni/(CaMg)O were also investigated at the lower temperature condition (650 °C) at which the sorption process is thermodynamically favoured. It was found that iron and nickel may be optimised in the substrate particles to enhance both the catalytic activity and the carbon deposition resistance during catalytic tests, at the same time reducing critical limitations on CO2 capture capacity
Ni-CaO Combined Sorbent-Catalyst Materials usage for Sorption Enhanced Steam Methane Reforming
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