Catalyst for synthesizing 2,3,6-trimethylphenol from m-cresol and preparation method thereof
A technology of trimethylphenol and m-cresol is applied in the field of catalysts and their preparation, which can solve the problems of high cost of iron-based composite oxide catalysts, toxic metals and the like, and achieve the effects of high selectivity, low cost and simple preparation method.
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Embodiment 1
[0016] 36.36g Fe(NO 3 ) 3 9H 2 O was dissolved in 150g of deionized water at a temperature of 60°C, and then 0.639g of Na 2 SiO 3 9H 2 O and 0.109g Cu(NO 3 ) 2 ·3H 2 O, after it dissolves, add 25 g of 25% ammonia solution to the solution, keep the temperature at 60° C., and continue to stir for 1 h to age it. After cooling to room temperature, suction filtration was performed, and the filter cake was dried at 100°C for 12 hours. The dried solid was calcined at 550°C for 5 hours to obtain the catalyst. The molar ratio of each component of the catalyst is Fe 2 o 3 : SiO 2 :CuO=100:5:1. The specific surface area of the catalyst determined by the low-temperature nitrogen adsorption-desorption method is 53m 2 / g, the pore volume is 0.180cm 3 / g.
[0017] The prepared catalyst (20-40) mesh is packed in a fixed-bed reactor with an internal diameter of 8 mm, and the catalyst loading is 3.5 ml. m-cresol, methanol and water are mixed in a molar ratio of 1:5:1.5, and inj...
Embodiment 2
[0019] 36.36g Fe(NO 3 ) 3 9H 2 O was dissolved in 150g of deionized water at a temperature of 40°C, and then 1.279g of Na 2 SiO 3 9H 2 O and 0.545g Cu(NO 3 ) 2 ·3H 2 O, after it dissolves, add 20.3 g of 25% ammonia solution to the solution, keep the temperature at 40° C., continue to stir for 3 h to age it. After cooling to room temperature, suction filtration was performed, and the filter cake was dried at 100°C for 12 hours. The dried solid was calcined at 500°C for 5 hours to obtain the catalyst. The molar ratio of each component of the catalyst is Fe 2 o 3 : SiO 2 :CuO=100:10:5. The specific surface area of the catalyst is 54m 2 / g, the pore volume is 0.183cm 3 / g.
[0020] The prepared catalyst (20-40) mesh is packed in a fixed-bed reactor with an inner diameter of 8mm, and the catalyst loading amount is 3.5ml. m-cresol, methanol and water are mixed in a molar ratio of 1:4:1, and injected via microinjection. Pump into the reactor, at normal pressure, 320...
Embodiment 3
[0022] 36.36g Fe(NO 3 ) 3 9H 2 O was dissolved in 150g of deionized water at a temperature of 60°C, and 1.023g of Na 2 SiO 3 9H 2 O and 0.0545g Cu(NO 3 ) 2 ·3H 2 O, after it dissolves, add 27.5 g of 25% ammonia solution to the solution, keep the temperature at 60° C., and continue stirring for 5 h to age it. After cooling to room temperature, filter with suction, and dry the filter cake at 100°C for 12 hours. The dried solid was calcined at 600°C for 3 hours to obtain the catalyst. The molar ratio of each component of the catalyst is Fe 2 o 3 : SiO 2 :CuO=100:8:0.5. The specific surface area of the catalyst is 50m 2 / g, the pore volume is 0.170cm 3 / g.
[0023]The prepared catalyst (20-40) mesh is packed in a fixed-bed reactor with an inner diameter of 8mm, and the catalyst loading amount is 3.5ml. m-cresol, methanol and water are mixed in a molar ratio of 1:7:2, and injected via microinjection Pump into the reactor, at normal pressure, 360°C and liquid hourl...
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