Catalytic biomass gasification: Simultaneous hydrocarbons steam reforming and CO2 capture in a fluidised bed reactor

Tars and CH 4 generated from biomass gasification processes contribute significantly to the energy content of the producer gas: catalytic tar and CH 4 steam reforming allows to clean the gaseous fuel and improve the H 2 yield; in addition, the use of a CO 2 sorbent minimises carbon oxides. As a result of the whole process, a H 2 rich fuel gas may be obtained. This experimental work is addressed to study the practical feasibility of such concepts, choosing CH 4 , toluene and 1-methyl naphthalene (1-MN) as biomass gasification key primary products. Ni is used as a catalyst for steam reforming, and dolomite as a sorbent for CO 2 capture. Two kinds of catalytic systems are tested as bed material: a mixture of dolomite and commercial nickel catalyst, and a new Ni/dolomite combined catalyst and sorbent. The experimental investigations have been carried out in a fixed bed microreactor and a bench scale fluidised bed reactor rig. Both combinations of catalyst and sorbent are found to be very effective in tar removing, with conversion values near to 100% for the compounds tested; simultaneous C0 2 sorption reveals itself as the key process step, improving significantly the performance of the catalytic system that may then decrease considerably after sorbent saturation.

[1]  Juan Adánez,et al.  Calcination of calcium-based sorbents at pressure in a broad range of CO2 concentrations , 2002 .

[2]  D. Harrison.  Sorption-Enhanced Hydrogen Production: A Review , 2008 .

[3]  José Corella,et al.  Olivine or Dolomite as In-Bed Additive in Biomass Gasification with Air in a Fluidized Bed: Which Is Better? , 2004 .

[4]  J. Goodwin,et al.  Hot Gas Removal of Tars, Ammonia, and Hydrogen Sulfide from Biomass Gasification Gas , 2007 .

[5]  Ian Narváez,et al.  Performance of Different Dolomites on Hot Raw Gas Cleaning from Biomass Gasification with Air , 1997 .

[6]  Anthony V. Bridgwater,et al.  Renewable fuels and chemicals by thermal processing of biomass , 2003 .

[7]  J. Grace,et al.  Sorption-enhanced steam reforming of methane in a fluidized bed reactor with dolomite as CO2-acceptor , 2006 .

[8]  D. Świerczyński,et al.  Characterization of Ni−Fe/MgO/Olivine Catalyst for Fluidized Bed Steam Gasification of Biomass , 2006 .

[9]  Kyriaki Polychronopoulou,et al.  Absorption-enhanced reforming of phenol by steam over supported Fe catalysts , 2006 .

[10]  Kj Krzysztof Ptasinski,et al.  Pretreated olivine as tar removal catalyst for biomass gasifiers : investigation using naphthalene as model biomass tar , 2005 .

[11]  D. Świerczyński,et al.  Steam reforming of tar from a biomass gasification process over Ni/olivine catalyst using toluene as a model compound , 2007 .

[12]  José Corella,et al.  Biomass Gasification with Steam in Fluidized Bed: Effectiveness of CaO, MgO, and CaO−MgO for Hot Raw Gas Cleaning , 1997 .

[13]  B. Kelleher,et al.  Review of literature on catalysts for biomass gasification , 2001 .

[14]  Seung Wook Baek,et al.  Catalytic cracking of tar component from high-temperature fuel gas , 2003 .

[15]  G. Taralas,et al.  Modeling the Thermal Destruction of Toluene (C7H8) as Tar-Related Species for Fuel Gas Cleanup , 2003 .

[16]  Gerrit Brem,et al.  Review of Catalysts for Tar Elimination in Biomass Gasification Processes , 2004 .

[17]  D. Świerczyński,et al.  Hydrogen production from biomass gasification on nickel catalysts: Tests for dry reforming of methane , 2002 .

[18]  José Corella,et al.  Calcined Dolomite, Magnesite, and Calcite for Cleaning Hot Gas from a Fluidized Bed Biomass Gasifier with Steam: Life and Usefulness , 1996 .

[19]  Andreas Jess,et al.  Mechanisms and kinetics of thermal reactions of aromatic hydrocarbons from pyrolysis of solid fuels , 1996 .

[20]  D. Świerczyński,et al.  Study of steam reforming of toluene used as model compound of tar produced by biomass gasification , 2008 .

[21]  Daniel Montané,et al.  Steam reforming model compounds of biomass gasification tars: conversion at different operating conditions and tendency towards coke formation , 2001 .

[22]  I. Barin.  Thermochemical data of pure substances , 1989 .

[23]  Gerrit Brem,et al.  Experimental comparison of biomass chars with other catalysts for tar reduction , 2008 .

[24]  P. Foscolo,et al.  CO2 capture by means of dolomite in hydrogen production from syn gas , 2008 .

[25]  P. U. Foscolo,et al.  Catalytic gasification of biomass to produce hydrogen rich gas , 1998 .