Hydrocracking catalyst containing silicon oxide-alumina
A silicon oxide-containing, hydrocracking technology, used in hydrocarbon oil cracking, petroleum industry, etc., can solve the problems of low hydrocracking activity and catalyst hydrocracking activity, and achieve improved hydrocracking activity and good selectivity. Effect
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preparation example Construction
[0017] A preferred preparation k value is 0.5-13A·(cm 2 g) -1 And the method of silica-alumina having one or more alumina X-ray diffraction spectrograms among characteristic γ, η, θ, δ and χ is: the hydrate of alumina is mixed with at least one free The sequenced silicon-containing molecular sieve or the composition containing the disordered silicon-containing molecular sieve is uniformly mixed, and calcined at 350-850° C. for 2-8 hours, preferably at 450-650° C. for 3-6 hours. The alumina hydrate is selected from one or more mixtures of trihydrate alumina, monohydrate alumina and amorphous aluminum hydroxide; or a hydrate containing silicon, titanium, magnesium, boron, zirconium, One or more mixtures of one or more of thorium, niobium, and rare earth alumina trihydrate, alumina monohydrate, and amorphous aluminum hydroxide; it can also be: will be selected from γ, η One or more crystal forms of alumina among , θ, δ and χ are directly mixed evenly with at least one disordere...
example 1
[0040] 800 grams of NaY type molecular sieve (SiO 2 / Al 2 o 3 =4.8, crystallinity is defined as 100%, Changling Oil Refinery product) is placed in 4000 milliliters, concentration is in the ammonium chloride (Beijing Chemical Plant product, analytical pure) aqueous solution of 1.0 mole, exchange 1 hour under stirring at 90 ℃, Filter, wash with deionized water until no chlorine ions are detected, dry at 120°C, and bake at 550°C for 4 hours. Repeat above-mentioned process twice to obtain the Y-type molecular sieve A of sodium content (in sodium oxide) 0.35% by weight (measured by flame atomic absorption spectrometry), record sample crystallinity with X-ray diffraction method and be 76%, get Y-type molecular sieve A 200 grams were placed in 1000 ml of ammonium fluoride (product of Beijing Chemical Plant, analytically pure) aqueous solution with a concentration of 0.2 moles, stirred at room temperature for 1 hour, filtered, dried at 120°C, and calcined at 600°C for 4 hours to obt...
example 2
[0042] Take by weighing 12 grams of example 1 disordered Y-type molecular sieve B and 100 grams of SB powder (gibbsite produced by Condea, Germany) and mix to obtain the precursor Si-2 of silicon oxide-alumina (dry basis 74% by weight) , the Si-2 was calcined at 550°C for 4 hours, its X-ray diffraction spectrum is shown in figure 1 b, the silicon oxide content and k value are shown in Table 1
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