Ilmenite as low-cost catalyst for producer gas quality improvement from a biomass pilot-scale gasifier

authors	Pio, DT; Gomes, HGMF; Tarelho, LAC; Ruivo, LCM; Matos, MAA; Pinto, RG; Frade, JR; Lemos, FMS
nationality	International
journal	ENERGY REPORTS
author keywords	Biomass; Bubbling fluidized bed; Catalyst; Gasification; Ilmenite
keywords	DIRECT GASIFICATION; BIOFUEL PRODUCTION
abstract	In this work, in-situ application of natural occurring ilmenite (FeTiO3) for upgrading the producer gas from a pilot-scale bubbling fluidized bed gasifier was performed and its influence on the gas characteristics and gasifier performance was analyzed. Without using ilmenite, the producer gas average composition (volumetric basis, dry gas) was 15.2% CO, 7.6% H-2, 3.8% CH4 and 15.6% CO2, with 0.50 H-2:CO molar ratio and 5.0 MJ/Nm(3) lower heating value. For this condition, 1.6 Nm(3) gas/kg biomass (dry basis) specific dry gas production, 44.5% cold gas efficiency and 68.4% carbon conversion efficiency were attained. Using ilmenite as catalyst, the producer gas average composition (volumetric basis, dry gas) was 13.9% CO, 11.7% H-2, 4.0% CH4 and 17.9% CO2, with 0.84 H-2:CO molar ratio and 5.1 MJ/Nm(3) lower heating value. For this condition, 1.7 Nm(3) gas/kg biomass (dry basis) specific dry gas production, 49.8% cold gas efficiency and 75.5% carbon conversion efficiency were attained. Thus, in-situ application of ilmenite generally improved the gasifier performance and induced an increase of H-2 concentration and H-2:CO molar ratio in the producer gas of 35.1% and 40.7%, respectively, improving its suitability for advanced gas applications that require high H-2:CO ratios, such as liquid fuels and chemicals synthesis. (C) 2019 Published by Elsevier Ltd.
publisher	ELSEVIER
issn	2352-4847
year published	2020
volume	6
beginning page	325
ending page	330
digital object identifier (doi)	10.1016/j.egyr.2019.08.063
web of science category	Energy & Fuels
subject category	Energy & Fuels
unique article identifier	WOS:000518455400050