The present invention relates to a method of reducing the deposit of metallic transition metal, particularly palladium, on a metal part in hydrogenation reactions using hydrogen and a heterogenous supported palladium catalyst. These metallic transition metal deposit, particularly palladium deposits, are particularly formed at areas which are exposed to high velocity and shear forces of the hydrogenation mixture comprising the transition metal catalyst, particularly palladium catalyst. They are significantly reduced or even avoided when the surface of the respective metal parts are coated by a plasma sprayed ceramic coating.

A hydrocarbon conversion process is disclosed. The process introduces a feed stream comprising hydrocarbons into a vessel having a refractory lining. The refractory lining comprises a refractory material and reinforcement metallic fibers. The reinforcement metallic fibers comprise about 0.5 wt % to about 8 wt % aluminum, 10 wt % to about 35 wt % chromium, and no less than about 50 wt % iron. The hydrocarbons are converted in the vessel at conversion conditions with or without a catalyst to yield a product stream.