Importance

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Abstract

The invention involves a process comprising regenerating a catalyst comprising (a) a support containing at least one oxide of a metal or metalloid and (b) at least one active metal, said process comprising in a first stage treating said catalyst in the absence of hydrogen with at least one sulfurizing agent comprising a polysulfide of the formula R--S.sub.(n) --R' wherein n is 2 to 20, R is an organic radical of 1-150 carbon atoms per molecule and R' is independently a radical as defined for R or a hydrogen atom, whereby said agent is incorporated at least in part in said catalyst, in a first portion of a second stage, treating the catalyst in the absence of hydrogen and in the presence of steam, moist air or moist inert gas, at a temperature up to 275.degree. C., and, in a second portion of the second stage, treating the catalyst in the presence of hydrogen at a temperature of at least 275.degree. C., wherein in the first stage a nitrogen compound is added.

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First Claim