title: Performance of Ni/dolomite pellet catalyst on gas distribution from cassava rhizome gasification with a modular fixed-bed gasifier.
abstract: Thermal conversion of cassava rhizome was performed using a modular downdraft gasifier with the addition of Ni-based catalysts as promising tar eliminating and produced gas upgrading techniques. The activities of a synthesized 5% Ni/dolomite pellet catalyst prepared by impregnation method were investigated in a secondary reactor downstream of the gasifier. High reforming activity of the Ni/dolomite pellet catalyst on tar reduction was achieved. The conversion to H2and CO was improved via steam reforming of methane and char reaction with CO2. Moreover, the formation of CH4and CxHywas diminished through the tar or condensable hydrocarbon reformed on the catalyst surface. The carbon and hydrogen conversions of cassava rhizome with prepared catalyst were 83.79% and 61.78%, respectively, at an air flow rate of 1.98 m3/hr. At this condition, tar formation was low, while the lower heating value was 4.39 MJ/m3and H2to CO molar ratio was 1.22. Generally, the addition of a catalyst not only enhanced gas production, but also reduced tar and particulate matter generation; thus, its implementation should help lessen the pollution control requirement and cost of operation, while allowing higher quality fuel gas production.
authors.affiliation: a Department of Environmental Engineering, Faculty of Engineering , Chulalongkorn University , Bangkok , Thailand.|b Energy Research Institute , Chulalongkorn University , Bangkok , Thailand.
authors.forename: V
authors.initials: V
authors.lastname: Sricharoenchaikul
authors.affiliation: c National Metal and Materials Technology Center , Pathumthani , Thailand.
authors.forename: D
authors.initials: D
authors.lastname: Atong
authors.affiliation: c National Metal and Materials Technology Center , Pathumthani , Thailand.
authors.forename: P
authors.initials: P
authors.lastname: Sornkade
authors.affiliation: a Department of Environmental Engineering, Faculty of Engineering , Chulalongkorn University , Bangkok , Thailand.
authors.forename: J
authors.initials: J
authors.lastname: Nisamaneenate
mesh_terms: D000392:Air Movements; D018533:Biomass; D002119:Calcium Carbonate / Q000737:chemistry*; D005740:Gases / Q000032:analysis*; D008274:Magnesium / Q000737:chemistry*; D002365:Manihot / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry
chemical_list: D005740:Gases; D009532:Nickel; D002119:Calcium Carbonate; D008274:Magnesium; C028042:calcium magnesium carbonate
keywords: Downdraft gasifier; cassava rhizome; catalyst; dolomite; thermal conversion