Catalytic tar decomposition of biomass pyrolysis gas with a combination of dolomite and silica

Abstract In this study the catalytic effects of dolomite and silica on biomass tar decomposition were investigated. The concentration of naphthalene is of particular interest since it is the most difficult compound to decompose when dolomite is used as catalyst. The two catalysts were tested in different combinations to see whether synergetic effects on the cracking of naphthalene could be found. Thermal and catalytic cracking were carried out at 700–900°C under ambient pressure in a fixed bed reactor using a tar-rich gas obtained from pyrolysis of different biomass materials. Characterisation of light components of tars using the solid phase adsorption method was also performed. Experimental results indicate that when a pure silica is placed in a layer above the dolomite, considerably less naphthalene and total light tar remains after cracking.

[1]  K. Sjöström,et al.  Thermal and catalytic cracking of n-Heptane in presence of CaO, MgO and Calcined Dolomites , 1991 .

[2]  Y. Solantausta,et al.  GASIFICATION GAS CLEANING WITH NICKEL MONOLITH CATALYST , 1997 .

[3]  José Corella,et al.  Biomass gasification with air in fluidized bed : Reforming of the gas composition with commercial steam reforming Catalysts , 1998 .

[4]  Pekka Simell,et al.  Catalytic purification of tarry fuel gas , 1990 .

[5]  Aacm Beenackers,et al.  BIOMASS FOR ENERGY AND INDUSTRY , 1998 .

[6]  Anthony V. Bridgwater,et al.  Research in thermochemical biomass conversion. , 1988 .

[7]  A. Krause,et al.  Steam Reforming of Gasification Gas Tar over Dolomite with Benzene as a Model Compound , 1999 .

[8]  Anthony V. Bridgwater,et al.  Advances in Thermochemical Biomass Conversion , 1993 .

[9]  Claes Brage,et al.  Temperature impact on the formation of tar from biomass pyrolysis in a free-fall reactor , 1997 .

[10]  Pekka Simell,et al.  Effects of gasification gas components on tar and ammonia decomposition over hot gas cleanup catalysts , 1997 .

[11]  Esa Kurkela,et al.  Formation and Catalytic Decomposition of Tars from Fluidized-Bed Gasification , 1993 .

[12]  Joginder Singh,et al.  Enzymic hydrolysis of rice straw by crude cellulase from Trichoderma reesei , 1998 .

[13]  D. Viggiano,et al.  Steam treated rice industry residues as an alternative feedstock for the wood based particleboard industry in Italy , 1998 .

[14]  Claes Brage,et al.  Use of amino phase adsorbent for biomass tar sampling and separation , 1997 .

[15]  Henrik Aldén,et al.  Conversion of Tar in Pyrolysis Gas from Wood Using a Fixed Dolomite Bed , 1988 .

[16]  Clas Ekström,et al.  Catalytic Conversion of Tars, Carbon Black and Methane from Pyrolysis/Gasification of Biomass , 1985 .

[17]  Ian Narváez,et al.  Fresh Tar (from a Biomass Gasifier) Elimination over a Commercial Steam-Reforming Catalyst. Kinetics and Effect of Different Variables of Operation , 1997 .

[18]  L. K. Mudge,et al.  Fundamentals of thermochemical biomass conversion , 1985 .

[19]  H. S. Mukunda,et al.  Tar characterisation in new generation agro-residue gasifiers - Cyclone and downdraft open top twin air entry systems , 1997 .

[20]  K. Sjöström,et al.  Provisional protocol for the sampling and anlaysis of tar and particulates in the gas from large-scale biomass gasifiers. Version 1998 ☆ , 2000 .

[21]  C. Lin,et al.  A process development for gasification of rice husk , 1998 .

[22]  Heikki Haario,et al.  Catalytic Decomposition of Gasification Gas Tar with Benzene as the Model Compound , 1997 .

[23]  Jukka Leppälahti,et al.  Catalytic purification of tarry fuel gas with carbonate rocks and ferrous materials , 1992 .

[24]  Claes Brage,et al.  Characteristics of evolution of tar from wood pyrolysis in a fixed-bed reactor , 1996 .

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

[26]  Krister Sjöström,et al.  Catalytic Upgrading of the Crude Gasification Product Gas , 1997 .

[27]  Pekka Simell.  Catalytic hot gas cleaning , 1996 .