CATALYTIC CRACKING CATALYST FOR HIGH-EFFICIENCY CONVERSION OF HEAVY OIL AND PREPARATION METHOD THEREOF

摘要

The invention discloses a catalytic cracking catalyst for heavy oil and a preparation method thereof. The catalyst contains 2-50 wt% of a phosphorus-containing ultrastable rare earth Y-type molecular sieve, 0.5-30 wt% of one or more other molecular sieve, 0.5-70 wt% of clay, 1.0-65 wt% of a high temperature resistant inorganic oxide and 0.01-12.5 wt% of a rare earth oxide. The phosphorus-containing ultrastable rare earth Y-type molecular sieve uses NaY molecular sieve as a raw material. The raw material is subjected to rare earth exchange and dispersing pre-exchange; the molecular sieve slurry is then filtered, washed with water and subjected to the first calcination to obtain a rare earth sodium Y molecular sieve which has been subjected to such "first exchange and first calcination", wherein the steps of rare earth exchange and dispersing pre-exchange are not restricted in sequence; and then the rare earth sodium Y molecular sieve which has been subjected to "one exchange and one calcination" is subjected to "second exchange and second calcination" which include ammonium exchange and phosphorus modification, wherein the steps of ammonium exchange and phosphorus modification are not restricted in sequence. The steps of ammonium exchange and phosphorus modification can be conducted continuously or non-continuously, the second calcination is conducted after ammonium exchange for reducing sodium, the phosphorus modification can be conducted before or after the second calcination. The catalyst provided by the invention has the characteristics of high heavy oil conversion capacity, high total liquid yield and high yield of light oil.