Solid superacid bifunctional catalyst and preparation method thereof
A dual-functional catalyst and solid superacid technology, applied in chemical instruments and methods, physical/chemical process catalysts, isomerization hydrocarbon production, etc., can solve problems such as high reaction temperature, low equilibrium conversion rate, and poor product selectivity. Achieve the effects of low reaction temperature, high equilibrium conversion rate and small grain size
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[0035] A preparation method of a solid superacid bifunctional catalyst, comprising the following steps:
[0036] (1) Mix the aqueous solution of metal zirconium salt and the aqueous solution of alkali evenly to obtain Zr(OH) 4 Hydrogel, Zr(OH) 4 The hydrogel is aged for more than 5 hours, and then washed, filtered, and dried to obtain a zirconia precursor, or to obtain zirconia after roasting;
[0037] (2) Immerse the zirconia precursor obtained in step (1) or the roasted zirconia in the ammonium sulfate solution, after fully impregnated, filter, dry, and roast to obtain SO 4 2- Acid-supported zirconia.
[0038] (3) The SO obtained in step (2) 4 2- Acid-supported zirconia is impregnated in an aqueous solution of Group VIII metal compounds, and after fully impregnated, it is filtered, dried, and roasted to obtain SO containing Group VIII metal components. 4 2- Acid-supported zirconia catalyst.
[0039] Preferably, the Group VIII metal component is selected from one or m...
Embodiment 1
[0069] (1) 200g ZrOCl 2 ·8H 2 O (Beijing Chemical Plant, analytically pure) was dissolved in 500ml of distilled water to make ZrOCl with a concentration of 1.25 mol / L 2 solution. Mix 200ml of ammonia water (25-28% NH 3 , Beijing Fine Chemicals Co., Ltd., analytically pure) mixed with 1500ml distilled water to make 2.1 mol / L NH 4 OH solution. Under vigorous stirring and room temperature, the prepared ZrOCl 2 Add NH to the solution at a rate of 1.5ml / min 4 in OH solution. ZrOCl 2 After the solution was added, the stirring was continued for 30 minutes, and the pH of the gel mother solution was 9.7 at this time. Transfer the resulting milky white gel mother liquor into a three-necked bottle, and raise the temperature to 98°C under vigorous stirring and reflux conditions, while adding 6.5 mol / liter of NH at a rate of 15ml / hour. 4 OH solution, keeping the pH of the mother liquor at 9.7 for aging, the time of the aging process is 48 hours. After the aging, the mother liquor...
Embodiment 2
[0075] (1) 200g ZrOCl 2 ·8H 2 O was dissolved in 312ml of distilled water to make ZrOCl with a concentration of 2.00 mol / L 2 solution. 100ml ammonia water (25~28%NH 3 ) mixed with 2131ml distilled water to make 0.8 mol / L NH 4 OH solution. Under vigorous stirring and room temperature, the prepared ZrOCl 2 Add NH to the solution at a rate of 0.8ml / min 4 in OH solution. ZrOCl 2 After the solution was added, the stirring was continued for 30 minutes. At this time, the pH of the gel mother liquor was 8.8. Transfer the resulting milky white gel mother liquor into a three-necked bottle, and heat up to 65°C under vigorous stirring and reflux conditions, while adding 3.5 mol / liter of NH at a rate of 15ml / hour. 4 OH solution, keeping the pH of the mother liquor at 8.8 for aging, the time of the aging process is 85 hours. After the aging, the mother liquor was suction filtered and the filter cake was repeatedly washed with distilled water, and the obtained filter cake was dried...
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