The British Petroleum Company, P.l.c.

John Trevor Clark

John J McCarroll

Stephen R Tennison

David E Brown

Malcolm Leslie Sims

Hydrogen transfer catalyst comprises (a) as support a graphite containing carbon having (1) a basal plane surface area of at least 100 m.sup.2 /g, (2) a ratio of BET surface area to basal plane surface area of not more than 5:1 and (3) a ratio of basal plane surface area to edge surface area of at least 5:1 and (b) as active component, 0.01 to 10% by weight, of the total weight of catalyst of a platinum group metal disposed thereon. The catalyst is particularly suitable for reforming.

Platinum group metal catalyst

Substrate surfaces are rendered resistant to coking by vaporizing an alkoxysilane in contact with the surface to form a protective layer of silica thereon.

Method of applying a layer of silica on a substrate

Graphite-containing carbon is prepared by subjecting carbon to the steps of (1) an initial heat treatment in an inert atmosphere, (2) an oxidation stage and (3) a further heat treatment in an inert atmosphere.

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Weybridge, United Kingdom

John Trevor Clark