Hydroisomerization bifunctional catalyst as well as preparation method and application thereof
A dual-function catalyst, hydroisomerization technology, applied in catalyst activation/preparation, catalyst, hydrogenation to hydrocarbons and other directions, can solve the problem of high hydrogenation temperature, reduce reaction temperature, improve stability, good economic benefits and industrial The effect of the application foreground
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Embodiment approach
[0026] According to a preferred embodiment of the present invention, the preparation method of the mesoporous niobium zirconium phosphate comprises:
[0027] (1) In the presence of alcohol, the niobium source, the zirconium source and the phosphorus source are first contacted to form a sol;
[0028] (2) aging the sol to form a gel;
[0029] (3) The gel is subjected to the first drying and the first firing in sequence to obtain the mesoporous niobium zirconium phosphate.
[0030] In step (1)
[0031] Preferably, in terms of moles, the ratio of the amount of phosphorus to the total amount of niobium and zirconium is 1-3:1, for example, it can be 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8 :1, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, preferably 1.4-2.5:1.
[0032] Preferably, in terms of moles, the ratio of the amount of niobium to zirconium is 1:1.2-2.5, for example, it can be 1:1.2, 1:1.4, 1:1.6, 1:1.8, 1:2, 1:2.2 , 1:2.5.
[0033] Preferably, the alcohol is C1-C5 alcohol, for example, it...
preparation example
[0101] This preparation example is used to illustrate the preparation of mesoporous niobium zirconium phosphate support
[0102] Weigh 1.93g zirconium oxychloride and 1.62g NbCl respectively 5 Dissolve in 45mL absolute ethanol, stir at room temperature for 30min until completely dissolved. In addition, 2.76 g of ammonium dihydrogen phosphate was weighed and completely dissolved in 10 mL of deionized water, and the solution was added to the above-mentioned zirconium-niobium ethanol solution at a rate of 12 mL / h to form a sol. After aging for 12 hours, the sol gradually formed a gel. Then, the gel was dried overnight at 100°C, ground evenly, and calcined at 400°C for 4 hours in an air atmosphere. Mesoporous niobium zirconium phosphate (ZrNbPO 4 ).
[0103] And using the same method to prepare mesoporous niobium phosphate (NbPO 4 ) and mesoporous zirconium phosphate (ZrPO 4 ). Among them, when mesoporous niobium phosphate and mesoporous zirconium phosphate are prepared, zi...
Embodiment 1
[0109] This example is used to illustrate the preparation of a hydroisomerization bifunctional catalyst by the impregnation method
[0110] Weigh the dried carrier powder (NbPO 4 , ZrNbPO 4 , ZrPO 4 ) in the 500mL sample bottle, take by weighing chloroplatinic acid for monometallic platinum catalyst, say palladium chloride for monometallic palladium catalyst, take by weighing chloroplatinic acid and palladium chloride for bimetallic PdPt catalyst (consumption makes Pd and Pt with 4 :1 molar ratio loaded on the carrier), respectively dissolved in appropriate amount of deionized water. The prepared metal solution was added dropwise to the carrier by equal volume impregnation method, ultrasonically dispersed for 10 min and sealed for 24 h. The impregnated catalyst was dried overnight at 110 °C and calcined at 400 °C for 3 h in an air atmosphere to prepare hydroisomerization bifunctional catalysts (Pd / NbPO 4 , Pd / ZrNbPO 4 , Pd / ZrPO 4 , Pt / NbPO 4 , Pt / ZrNbPO 4 , Pt / ZrPO 4 ...
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