Composite solid acid catalyst as well as preparation method and application thereof
A solid acid catalyst and composite technology, applied in the field of catalysis, can solve the problems of product separation and catalyst difficulty, and achieve the effects of easy separation, high conversion rate and good stability
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[0036] Another object of the present invention is to provide a kind of preparation method of composite solid acid catalyst as above, and this preparation method comprises the steps:
[0037] S1: Dissolve the metal salt containing A, the metal salt containing B and the metal salt containing M in water to obtain a mixed solution; wherein, A is a divalent metal cation, B is a trivalent metal cation, and M is Zr 4+ , Sn 4+ 、Cu 2+ any of the
[0038] S2: configure alkaline solution;
[0039] S3: Add the alkaline solution dropwise to the mixed solution until the system pH=9.5, stir in a water bath at 75°C to 85°C, age, and filter to obtain a precipitate;
[0040] S4: drying and grinding the precipitate in sequence to obtain powder;
[0041] S5: Calcining the powder at 700°C to 800°C to obtain AB 2 o 4 -M precursor;
[0042] S6: put AB 2 o 4 The -M precursor is added to the organic titanium salt hydrolysis solution, stirred in a water bath at 70°C to 80°C to form a gel; the ...
Embodiment 1
[0063] This embodiment provides a composite solid acid catalyst, the structural formula of the composite solid acid catalyst is SO 4 2- -ZnFe 2 o 4 -Cu 2+ -TiO 2 .
[0064] S1: According to n(Zn 2+ ): n(Fe 3+ ): n(Cu 2+ )=1:1.8:0.2 ratio to weigh Zn(NO 3 ) 2 ·6H 2 O, Fe 2 (SO 4 ) 3 9H 2 O, Cu(NO 3 ) 2 ·3H 2 O, and be dissolved in high-purity water to obtain a mixed solution;
[0065] S2: Sodium hydroxide solution with a total substance concentration of 5.2mol / L;
[0066] S3: Add sodium hydroxide solution dropwise to the mixed solution until the system pH=9.5, stir in a water bath at 75°C for 3 hours, then filter to obtain a precipitate;
[0067] S4: drying and grinding the precipitate in sequence to obtain powder;
[0068] S5: Put the powder in a muffle furnace and calcinate at 800°C for 3 hours to obtain ZnFe 2 o 4 -Cu 2+ Precursor;
[0069] S6: According to ZnFe 2 o 4 -Cu 2+ with TiO 2 The mass ratio is 5:10, the ZnFe 2 o 4 -Cu 2+ The precursor...
Embodiment 2
[0077] This embodiment provides a composite solid acid catalyst, the structural formula of the composite solid acid catalyst is SO 4 2- -ZnFe 2 o 4 -Zr 4+ -TiO 2 .
[0078] S1: According to n(Zn 2+ ): n(Fe 3+ ):n(Zr 4+ )=1:2.0:0.05 ratio to weigh Zn(NO 3 ) 2 ·6H 2 O, FeCl 3 , ZrCl 4 , and dissolved in high-purity water to obtain a mixed solution;
[0079] S2: Sodium bicarbonate solution with a total substance concentration of 7.4mol / L;
[0080] S3: Add the sodium bicarbonate solution dropwise to the mixed solution until the system pH=9.5, stir for 4 hours in a water bath at 85°C, and then filter to obtain a precipitate;
[0081] S4: drying and grinding the precipitate in sequence to obtain powder;
[0082] S5: Put the powder in a muffle furnace and calcinate at 900°C for 3 hours to obtain ZnFe 2 o 4 -Zr 4+ Precursor;
[0083] S6: According to ZnFe 2 o 4 -Zr 4+ with TiO 2 The mass ratio is 6:10, the ZnFe 2 o 4 -Zr 4+ The precursor was added to the hydr...
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