The characteristics and commercial results of newly developed FCC catalysts named "MRZ" are described. MRZ catalysts consist of three types: high liquid yield, high octane and high metal tolerance series. The general characteristics of MRZs are as follows: 1) low coke and gas formations, 2) high hydrothermal stability, and 3) low catalyst consumption. The commercialization of the new catalysts was attained to apply new catalyst preparation technique and to use highly silicious Y zeolite as an active ingredient. The low coke forming characteristics of MRZ catalysts are attributed to unique pore structure and acidity of its matrix. The high hydrothermal stability of MRZs is attributed to low surface area of matrix and the application of high SiO2/Al2O3 mole ratio of Y zeolite. The commercial application of MRZ catalysts for FCC plants showed good performances and high metal tolerance. It is, therefore, expected that these are good catalysts for heavy oil cracking.

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