Performance research of lanthanum-loaded dolomite catalyst for pine catalytic gasification

Abstract

To enhance the catalytic effect of dolomite, La/Dol catalyst was prepared by impregnation modification of dolomite with La (NO3)3 as additive. The catalyst was characterized by BET, SEM and XRD. With pine rods as raw materials and La/Dolas reforming catalysts, the effects of gasification temperature and La amount of catalysts on the catalytic gasification of pine were compared and analyzed in a self-made two-stage biomass gasification reforming experimental furnace. The results show that a small amount of La (2%) can obviously promote the forward progress of water gas reaction and perfect the catalytic reforming effect. Under the working condition of steam flow rate of 10 g/min, 2-La/Dol catalyst and reforming temperature of 750°C, with the increase of gasification temperature, the amount of H2 increases significantly, and the highest volume fraction of H2 increases from 28.51% (0-La/Dol) to 41.72% (2-La/Dol). La2O3 in the catalyst promotes the secondary cracking of tar. As a result, the tar content of liquid phase product is obviously reduced, and the number of functional groups is also reduced. La2O3 on dolomite surface occupies active sites, so carbon filaments are not suitable for accumulation and carbon deposition is inhibited. Carbonate (La2O2CO3) in the catalyst can react with carbon to slow down the carbon deposition on the surface and improve the activity and service life of the catalyst.