Catalyst for catalytic cracking of hydrocarbon, which is used in production of light olefin and production method thereof
Disclosed are a molecular sieve catalyst and a preparation method thereof to produce light olefins from cracking naphtha catalytically in severe environments of high temperature and high moisture. In detail, the catalyst is prepared by spray-drying and calcining the mixed slurry, in which 0.01˜5.0 wt % of MnO 2 and 1˜15 wt % of P 2 O 5 are simultaneously imbedded in catalyst which consists of zeolite, clay and inorganic complex. According to the present invention, the method that manganese and phosphate are imbedded simultaneously in zeolite and inorganic complex is used to increases thermal-stability of obtained spherical catalyst, and increase olefin yield of cracking hydrocarbon such as naphtha by protecting acid-site of zeolite. To synthesize the required catalyst, the important procedures are mixing ratio and mixing sequence of Mn, P, zeolite, and inorganic complex.
1. A catalyst for catalytically cracking hydrocarbons of C4 or higher having a boiling point of 30-200° C., which is characterized in that 0.01-5.0 wt % of MnO 2 and 1-15 wt % of P 2 O 5 are supported simultaneously with each other on catalyst components,
wherein the catalyst components comprise 1-50 wt % of zeolite, 21-70 wt % of clay, and 1-40 wt % of an inorganic oxide binder, the zeolite consisting of ZSM-5, and
wherein both the MnO 2 and the P 2 O 5 are embedded on each of the zeolite, the clay and the inorganic oxide in the catalyst components.
2. The catalyst of claim 1 , wherein the inorganic oxide binder is Al 2 O 3 , SiO 2 or Al 2 O 3 —SiO 2 .
3. The catalyst of claim 1 , wherein the zeolite has a Si/Al molar ratio of less than or equal to 200.
4. The catalyst of claim 1 , wherein the MnO 2 is formed from a manganese precursor of a sulfate, nitrate, chloride or acetate compound or combinations thereof.
5. The catalyst of claim 1 , wherein the P 2 O 5 is formed from phosphorus precursor compound H 3 PO 4 , (NH 4 ) 3 PO 4 , H(NH 4 ) 2 (PO 4 ), H 2 (NH 4 )PO 4 , or combinations thereof.