Patent ID: 8722557

Claim:
A method for regenerating a used catalyst mixture comprising the steps of: (a) decoking the used catalyst mixture in the presence of an oxygen-containing gas to produce a decoked catalyst mixture wherein the used catalyst mixture comprises: (i) an isomerization catalyst comprising magnesium oxide, (ii) a metathesis catalyst comprising an inorganic carrier and at least one of molybdenum oxide and tungsten oxide; and, (iii) coke and/or carbon deposits wherein the coke and/or carbon deposits are present in the pores of the used catalyst mixture or on the surface of the used catalyst mixture, and wherein the decoked catalyst mixture contains less than 0.5 wt % carbon; and (b) regenerating the decoked catalyst mixture by contacting the decoked catalyst mixture with steam at a temperature in the range of 100 to 300° C. to produce a regenerated catalyst mixture wherein the used catalyst mixture is recovered from a process for making propylene from a linear butene and ethylene.