The Development of Ni/Dolomite Catalyst in Simultaneous Biomass Gasification and Reforming in Fluidized Bed

Abstract

Simultaneous gasification and steam reforming of the biomass on Ni/dolomite catalyst in fluidized bed reactor were studied in the gaseous production in the one stage reactor. Problem statement: The parameters such as temperature, steam flow rate, biomass feed rate, gas flow rate for fluidization, oxygen flow rate and catalyst types were studied to produce the high gaseous products including tar elimination. Approach: The temperature at 780°C, steam flow rate of 222 mmoL h −1 , gas flow rate for fluidization 450 mL min −1 and oxygen input 50 mL min −1 were found to be the suitable conditions. The Ni/Dolomite and the developed Ni/Dolomite were studied about their performance.Results: It was confirmed that Ni/Dolomite and newly developed Ni-WO 3 /Dolomite show high performance in biomass gasification. Conclusion/Recommendations: It was claimed that Ni/Dolomite catalyst was the effective and give best performance for tar cracking. Newly developed Ni-WO 3 /Dolomite catalyst was investigated to resist sulfur nd coking. Three types of catalyst were used in the biomass gasification, which are Ni/Dolomite, Ni/Dolomite+Silica binder and Ni-WO 3 /Dolomite. From the XRD analysis, structures of type 1 (Ni/dolomite) and type 2 (Ni/Dolomite+Silica binder) were similar which were in CaCO 3, MgNiO 2 , NiO and MgO forms. Type 3 (Ni-WO 3 /Dolomite) was CaWO 4 , MgNiO 2 , NiO and MgO forms. When the catalytic gasification was operated, newly Ni-WO 3 /Dolomite catalyst was the best catalyst for bamboo and palm shell biomasses, which could produce the high carbon monoxide and hydrogen but low methane and carbon dioxide were found. Carbon deposition on catalyst was around 0.37 mg according to the TG analysis.

Gasification Characteristics ofPinus rigida(Pitch Pine) andQuercus variabilis(Oriental Oak) with Dolomite Catalyst in a Fluidized Bed Reactor

“…XRD patterns of 5 wt% Ni/ dolomite and 5 wt% Co/dolomite catalysts are also shown in Figure 5. XRD patterns of natural and calcined dolomite (Hu et al, 2006) and Ni/dolomite (Ketcong et al, 2009) were similar to other researchers' results. Figures 5a and 5b show the effects of catalyst species on product yields after gasification at 860°C of P. rigida and Q. variabilis, respectively.…”

“…Moreover, catalysts can be used directly as fluidizing media. Dolomite as a catalyst for biomass has been tried by Hu et al (2006) and Ketcong et al (2009). Acharya et al (2010) researched for hydrogen production from steam gasification of biomass in the presence of sorbent CaO.…”

Quality Enhancement of Producer Gas From Cassava Rhizome Using High Temperature Air-Steam Downdraft Gasification

“…In the producer gas during the gasification process, there is an undesirable complex mixture involving heavy hydrocarbons called tar. Tar elimination by thermal cracking (Bui et al, 1994) or by using a catalyst (Ketcong et al, 2009) are widely used methods. Tar can condense at low temperatures, which can lead to clogged gas pipelines and it can adhere on the filters of engines.…”