| 1. A molecular sieve-containing catalyst for cracking hydrocarbons, comprising molecular sieve, refractory inorganic oxide,
clay and a metal component, wherein the amount of said molecular sieve is from 1 to 90% by weight, the refractory inorganic
oxide is from 2 to 80% by weight, the clay is from 2 to 80% by weight, and the metal component is from 0.1 to 30% by weight,
calculated as the oxide of said metal having its maximum valence state, based on the total amount of the catalyst, wherein
said metal component exists essentially in a reduction state and is one or more metals selected from the group consisting
of metals of Group IIIA (other than aluminum), metals of Group IVA, VA, IB, IIB, VB, VIB and VIIB, and non-noble metals of
Group VIII of the periodic table, and said molecular sieve is one or more selected from the group consisting of Y-zeolite,
phosphorus-and/or rare-earth-containing Y-zeolite, ultra-stable Y-zeolite, phosphorus and/or rare-earth-containing ultra-stable
Y-zeolite, beta zeolite, zeolites having MFI structure, and phosphorus-and/or rare-earth-containing zeolites having MFI structures
and wherein said metal component has a ratio of its average valence state to the maximum valence state of from 0.1 to 0.7
and exists in refractory inorganic oxide and/or clay.
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