Desenvolvimento experimental e validaÃÃes do processo catalÃtico (Ni/γ-Al2O3/CeO2-Al2O3) de reforma metano-diÃxido de carbono em reator de leito fluidizado

AUTOR(ES)

Josà Adair PacÃfico dos Santos

DATA DE PUBLICAÇÃO

2009

RESUMO

Carbon dioxide of methane reforming into syngas over Ni/γ-Al2O3 and Ni/CeO2-Al2O3 catalysts was investigated. The Nikel catalysts presented high activity and stability although of the potential of coke formation on its active sites. The development of the dry methane reform for process, main component of natural gÃs (GN), was studied in a fluidized bed reactor and the employed reaction model was the two phases presented by Van deemeter and Van der Laan (1961) and Kunii-Levenspiel (1969). To perfom the reaction a laboratory pilot plant system was designed and constructed, consisting of a fluidized bed stainless steel (AISI 310S) reactor. Its dimensions and operational characteristics were: height Ht = 1,18 m, internal diameter Dint. = 0,038 m, minimum fluidization velocity umf = 0,31 cm/s, superficial velocity uo = 1,76 cm/s, operational superficial flow Qo = 1200 cm3/min, particle diameter in the ranger of (dp) = 65-114 μm, mass of catalysts mcat. = 280 g; the temperaturae of operation was 973,15K under a atmosphere pressure. Under these conditions the models for mass and energy balances were applied to the process when the concentration profiles of the reactant and products were obtained. The presented mathematical models for this reseach were validated from the data obtained from the bubbling fluidized bed reactor. The study was performed with a feed molar ratio of CH4:CO2:Ar = (2:3:15 v/v); spatial times 14 gcat s cm-3 to 28 gcat s cm-3; GHSV = (128,57- 257,15) cm3 gcat - 1 h-1 when the conversion levels for CH4 ans CO2 were 51,54% e 45,51% respectively. The yelds for H2 and CO in the syngas were 47,72% and 97,67% respectively. The selectivity at the outlet of the reactor, based on the model and the experimental measurements, was of the order of 48,05% for H2 and 98,35 for the produced synthese gÃs

ASSUNTO(S)

carbon dioxide reforming of methane reator de leito fluidizado syngas production engenharia quimica produÃÃo de gÃs de sÃntese reforma metano-diÃxido de carbono fluidized bed reactor

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