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Methanol-higher alcohol mixtures can be synthetised from natural gas via CO/CO(2)/H(2) mixtures, and constitute potential octane boosters for unleaded gasoline. Various catalyst formulations have been developed which allow rather high alcohol selectivities to be reached, but these performances are generally reached after an ageing period which is necessary for the in situ preparation of the active phase. For this reason, the evolution of the copper-cobalt-based model catalysts has been studied in different test equipment and operating conditions, such as fixed bed, slurry phase and Berty reactors, as well as autoclaves and differential scanning calorimeters. The performances obtained under these conditions are compared. The test results, together with some mechanistic studies (thermoprogrammed desorptions, chemical trapping, chemisorption) and characterisation of the catalyst before and after test (FT-IR, thermoprogrammed reduction, magnetic measurements), allow the proposal of a reaction mechanism and the gaining of a better knowledge of the active sites. The correlations established enable the prediction of the performances, sophisticated alcohol synthesis tests thus becoming unnecessary. New active phases were also prepared and evaluated. These lead to a higher activity and/or alcohol selectivity.

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Authors: CHAUMETTE P, GERTH, Institut Français du Pétrole, Rueil Malmaison (FR);COURTY P ET AL., GERTH, Institut Français du Pétrole, Rueil Malmaison (FR)
Bibliographic Reference: EUR 13464 EN (1991) 40 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-2682-2
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