| 简介 |
The invention relates to the field of the petroleum refining and petrochemical industry, and more particularly to methods for manufacturing catalysts of the catalytic cracking of petroleum fractions. The invention solves the problem of producing an effective cracking catalyst. A method for manufacturing a cracking catalyst includes carrying out ion exchanges for cations of rare-earth elements and ammonium in NaY zeolite, two stages of ultrastabilization of the zeolite in an environment of water vapour, mixing the zeolite with a matrix comprised of bentonite clay, aluminium hydroxide and amorphous aluminium silicate, producing a composition, spray drying said composition, and subsequently calcining and producing a catalyst, wherein prior to the first stage of ultrastabilization, additional ion exchange of sodium cations in the zeolite for magnesium cations or calcium cations is carried out without intermediate filtration to produce Y zeolite, containing : not more than 0.6 mass% sodium oxide; 0.5-5.5 mass% rare earth element oxides; 0.5-4.0 mass% magnesium oxide; 1.0-7.0 mass% calcium oxide; wherein the catalyst contains 0.1-1.1 mass% rare earth element oxides; 0.23 mass% sodium oxide; 0.1-0.8 mass% magnesium oxide from the zeolite component or 0.2-1.4 mass% calcium oxide from the zeolite component. |
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