Estudo do comportamento de catalisadores massicos a base de aluminio, niquel e cobre na hidrogenação do monoxido de carbono

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

In this work it was studied the behaviour of bulk Al, N, and Cu based-catalysts in the CO hydrogenation reaction, evaluating their performance as a function of activation temperature (275, 385 and 500 DEGREES C and preparation conditions (pH and salt solutions concentration). The catalytic tests were developed in a fixed-bed tubular reactor, where the solids were activated in situ and the reaction was carried out at 250 DEGREES C and 50 bar. Results of BET analysis showed that the investigated systems are less stable than commercial catalyst AlCoCu.). The catalytic tests were developed in a fixed-bed tubular reactor, where the solids were activated ?in situ? and the reaction was carried out at 250 DEGREES C and 50 bar. Results of BET analysis showed that the investigated systems are less stable than commercial catalyst AlCoCu. Reaction products analysis indicated a high selectivity of these solids to alcohol, particularly methanol. Temperature Programmed hydrogenation tests (HTP), performed after reaction, indicated that the surface carbon formation is not significant. These results showed experimentally that the segregation process of the Ni-Cu alloy, described in theoretical studies in the literature, is caused by alloy thermodynamic instability at reaction conditions. The segregation leads to an alloy enrichment in Cu, located on the catalyst surface

ASSUNTO(S)

catalise heterogenea hidrogenação monoxido de carbono catalisadores de niquel catalisadores de cobre

ACESSO AO ARTIGO

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