Dr. LUCCHESI presented this paper which was in effect a condensed abstract of the work which he and his co-workers had carried out during the past decade. Because of time restrictions there were only a limited number of questions raised by the audience.

One was concerned with the possible carbonyl formation between CO in the gas phase and group VI11 metals in the catalyst, causing a substantial alteration in catalyst characteristics. The author answered that it was impossible for the metals mentioned and CO to form corresponding carbonyls.

The paper offered a primarily theoretical understanding of the pathways in which the hydrocarbon synthesis reaction can occur, and presented the means of measurement of Fischer-Tropsch product distributions under both steady and non-steady states. A combination of ultra high vacuum surface characterisation with conventional medium pressure kinetic studies had been employed, which enabled them to probe the relationship between surface structure and catalytic activity.

Several suggestions cited in the paper were interesting and worthy of attention for further development; for instance, the author, through his surface science study, emphasized that it was indeed remarkable that the surface carbide model originally proposed by Fischer-Tropsch was in many respects correct, although there were no modern experimental techniques in the early years of the century.

The introduction of the strong metal support interaction concept with the aim of tailoring catalysts to particular uses has led the author's company to make efforts to try to obtain the desired activity/selectivity patterns. 403 D A NEW ROUTE TO HYDROGEN FROM RESIDUES Chairman: J. ZEMELLA, Maraven SA (Venezuela) Scientific Secretary: J. BARNWELL, Bechtel Great Britain Ltd. (UK) SP 9 A New Route to Hydrogen from Residues T. Tomita, K. Kikuchi, T. Sakamoto, K. Ishida and A. Moriya (Toy0 Engineering Corporation, Japan). 407 DISCUSSION 415 405 A

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