Catalytic Cracking Gasification Of Biomass Research

In this thesis, the catalytic pyrogasification of saw dusts from China is investigated in the fluidized bed gasification experimental system established by ourself. These researches include the experiments of the new process of unconventional gasification of biomass, the preparation and the screen of catalysts, the study of catalyst's properties, the thermodynamic simulation of process and so on Some useful result have be obtained:1 It is proved by the experiments of catalytic pyrogasification that the new way of unconventional gasification with non-reactive gas is superior in the consumption of reactants, the improvement of catalyst stability, the distribution of producted gas and the clearance of tar2.The nickel alaminium catalyst copreciptated is developed It have the activity at low temperature for the pyrogasification of biomass the gasific temperature is reduced from 800℃ in unconventional gasification to about 650℃ and the higher purgative level of producted gas is achieved without the produce of tar The deactivation of catalysts is slow, the deactive catalysts can be regenerated with the mixed gas. So this catalyst has commercial development value.3.It is proved by the investigations on the property and the characterization of catalyst that the activable precursors of the catalyst is the irreyular spinels phase The excelletest catalyst is a stoichiometric NiAl₂O₄ with Ni/Al 1:2, calcined at 700⁷50 ℃ and reduced with appropriate condition. There is the internal relationship of activity with the irregular degree and crystal size of the catalytic precursors.4.The tow extreme substable phase model of the oxidate of nickel aluminium catalysts is brought up bass on the investigative results summed experiments. The tow extreme substatte phase of low and high nickel strueture have a great difference in the adsorption of hydrogen catalytic activity reduction characteristic and crystal shape. They are separated by the appearence of aluminate acid radical. The first extreme substable phase in them is better to the pyrogasification of biomass.