A kind of method that takes molecular sieve as catalyst to produce cresol
A molecular sieve and catalyst technology, applied in the field of cresol production using molecular sieve as catalyst, can solve problems such as waste water and equipment corrosion
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Embodiment 1
[0025] The preparation process of the catalyst is as follows: 120 grams of MCM-49 molecular sieve with a molar silicon-aluminum ratio of 20, 80 grams of titanium oxide, and an appropriate amount of 10% dilute nitric acid as extrusion aids are extruded. Dry at 120°C and bake at 550°C for 10 hours. The above catalyst was cut into 1-3 mm to prepare columnar catalyst precursor A0. 20 grams of precursor catalyst A0 was added to 50 ml of nitric acid solution with a weight content of 10%, and soaked at room temperature for 4 hours. Dry at 120°C and bake at 500°C for 10 hours to prepare A1. Immerse 20 grams of A1 sample in ammonium dihydrogen phosphate aqueous solution for 12 hours, dry at 120°C, and bake at 700°C for 3 hours, P 2 o 5 The weight content is 3%, and A2 is prepared. Catalyst A was obtained by steaming 20 grams of A2 in a 100% steam atmosphere for 10 hours at a temperature of 300° C. and calcining at 550° C. for 3 hours. Molecular sieve content 60%.
Embodiment 2
[0027] The preparation process of the catalyst is as follows: 80 grams of MCM-49 molecular sieve with a molar silicon-aluminum ratio of 30 is mixed with 100 g of titanium dioxide weight 20% titanium sol, and an appropriate amount of 10% dilute nitric acid is added as an extrusion aid to extrude. Dry at 120°C and bake at 700°C for 4 hours. The above catalyst was cut into 1-3 mm to prepare columnar catalyst matrix B0. Add 50 ml of 10% nitric acid solution by weight to 20 grams of matrix catalyst B0 and soak at room temperature for 10 hours. B1 was prepared by drying at 120°C and calcining at 600°C for 2 hours. Immerse 20 grams of B1 sample in ammonium dihydrogen phosphate aqueous solution for 12 hours, dry at 120°C, and bake at 550°C for 10 hours, P 2 o 5 The weight content is 0.01%, and B2 is prepared. Catalyst B was obtained by steaming 20 grams of B2 in a 100% steam atmosphere for 2 hours at a temperature of 600° C. and roasting at 550° C. for 3 hours. The molecular sieve...
Embodiment 3
[0029] The preparation process of the catalyst is as follows: 200 grams of MCM-49 molecular sieve with a molar silicon-aluminum ratio of 80 is mixed with 30 grams of titanium dioxide and 100 grams of titanium dioxide with a weight of 20% titanium sol, and an appropriate amount of 10% dilute nitric acid is added as an extrusion aid for extrusion molding. Dry at 120°C and bake at 550°C for 4 hours. The above catalyst was cut into 1-3 mm to prepare columnar catalyst precursor C0. Add 50 ml of 10% nitric acid solution by weight to 20 grams of precursor catalyst C0, soak at room temperature for 24 hours. Dry at 120°C and bake at 600°C for 3 hours to obtain C1. 20 grams of C1 sample was impregnated with calcium nitrate aqueous solution for 24 hours, dried at 120°C, and roasted at 600°C for 3 hours. The weight percentage of calcium oxide in the catalyst was 0.1%, and C2 was obtained. Catalyst C was obtained by steaming 20 grams of C2 in a 100% steam atmosphere for 10 hours at a temp...
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