Chemical hydrocracking catalyst as well as preparation method and application thereof
A hydrocracking and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve problems such as low selectivity and poor conversion ability of heavy condensed ring aromatics
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Embodiment 1
[0090] [Example 1] Preparation of layered MWW type zeolite:
[0091] The layered MWW type zeolite of the present invention is selected from the SRZ-21 zeolite of Sinopec Catalyst Branch Company, and concrete preparation is as follows (by CN101121524A specification example embodiment 1):
[0092] Sodium aluminate (Al 2 o 342.0% by weight) 6.1 grams are dissolved in 288 grams of water, add 1.0 grams of sodium hydroxide to make it dissolve, then add 34.0 grams of hexahydropyridine under stirring, then add 60 grams of solid silicon oxide, and 5.5 grams of trimethylchlorosilane , the material ratio (molar ratio) of reactant is:
[0093] SiO 2 / Al 2 o 3 =40
[0094] NaOH / SiO 2 =0.025
[0095] Chlorotrimethylsilane / SiO 2 =0.05,
[0096] Hexahydropyridine / SiO 2 =0.50
[0097] h 2 O / SiO 2 =16
[0098] After the reaction mixture was evenly stirred, it was put into a stainless steel reaction kettle, and crystallized at 135° C. for 50 hours while stirring. After taking it ...
Embodiment 2
[0103] Hydrogen type zeolite beta raw material is the same as the zeolite beta of comparative example 1;
[0104] The layered MWW type zeolite is selected from the SRZ-21 zeolite prepared in Example 1.
[0105] Take the above-mentioned hydrogen-type β zeolite, SRZ-21 zeolite and pseudo-boehmite, mix well, knead, extrude, dry at 120°C, and then roast in an air atmosphere at 530°C for 2 hours to obtain the required catalyst carrier . Prepare a bimetallic aqueous solution with nickel nitrate and ammonium tungstate, impregnate the above-mentioned catalyst carrier by an equal-volume impregnation method, dry it at 90°C, and then bake it in an air atmosphere at 500°C for 2 hours to obtain a catalyst precursor. The obtained catalyst precursor is reduced to 450° C. under hydrogen and kept for 4 hours to obtain the hydrocracking catalyst C1 of the present invention. In parts by weight, its composition is: 3.5 parts of Ni-12.5 parts of WO x / 52 parts of beta zeolite-10 parts of SRZ-21...
Embodiment 3
[0109] Hydrogen type zeolite beta raw material is the same as the zeolite beta of comparative example 1;
[0110] The layered MWW type zeolite is selected from the SRZ-21 zeolite prepared in Example 1.
[0111] The hydrogen-type β zeolite, SRZ-21 zeolite and pseudo-boehmite are fully mixed, kneaded, extruded, dried at 120°C, and then calcined in an air atmosphere at 530°C for 2 hours to obtain the required catalyst carrier. The trimetallic aqueous solution was prepared with cobalt oxalate, ammonium tungstate and ammonium molybdate, and the catalyst carrier was impregnated by equal volume impregnation method, dried at 90°C and then calcined at 500°C in an air atmosphere for 2 hours to obtain a catalyst precursor. The obtained catalyst precursor is reduced to 480° C. under hydrogen and kept for 6 hours to obtain the hydrocracking catalyst C2 of the present invention. In parts by weight, the composition is: 1.3 parts of Co-5.8 parts of WO x1 -6.7 MoOs x2 / 35 parts of beta zeol...
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