Oxide catalyst and phosphoric oxide catalyst for hydrocarbon steam cracking, method for preparing the same and method for preparing olefin by using the same
The present invention relates to an oxide catalyst and a phosphoric oxide catalyst for hydrocarbon steam cracking, method for preparing the same and a method for preparing olefin by using the same. More precisely, the present invention relates to an oxide catalyst for hydrocarbon steam cracking represented by formula 1 and a phosphoric oxide catalyst for hydrocarbon steam cracking represented by formula 3 which would be used for the production of olefin such as ethylene and propylene by hydrocarbon steam cracking, and a method for preparing the same. The present invention provides an oxide catalyst and a phosphoric oxide catalyst for hydrocarbon steam cracking that has excellent thermo-stability at high temperature and improved olefin yield. CrZr j A k O x [Formula 1] CrZr j A k P l O x [Formula 3] Wherein, j, k, l and x are as indicated in the description.
1. A preparing method of an oxide catalyst for hydrocarbon steam cracking, comprising the following steps:
(a) preparing an aqueous solution by mixing:
a Cr containing compound,
a Zr containing compound or a Cr—Zr containing compound,
a Ti containing metal compound, and
water;
(b) preparing a slurry by coprecipitation after adding ammonia water to the aqueous solution;
(c) reflux-heating or hydrothermal treating the prepared slurry; and
(d) preparing an oxide catalyst for hydrocarbon steam cracking by filtering, drying and calcining the slurry of step (c),
wherein the Ti containing metal compound is a salt, acid, oxide, hydroxide or alkoxide.
2. The preparing method of an oxide catalyst for hydrocarbon steam cracking according to claim 1 , wherein the Cr containing compound and the Zr containing compound or the Cr—Zr containing compound is sulfates, nitrates, oxalates, halides or chlorides.
3. The preparing method of an oxide catalyst for hydrocarbon steam cracking according to claim 1 , wherein the temperature of the aqueous solution of step (b) is 40-80° C.
4. The preparing method of an oxide catalyst for hydrocarbon steam cracking according to claim 1 , wherein the pH of the aqueous solution after adding ammonia water of step (b) is 7-9.
5. The preparing method of an oxide catalyst for hydrocarbon steam cracking according to claim 1 , wherein the drying in step (d) is performed at 120° C. for at least 2 hours.
6. The preparing method of an oxide catalyst for hydrocarbon steam cracking according to claim 1 , wherein the calcining in step (d) is performed at 750-1600° C. for at least 4 hours.