A composite catalyst coated with carbon layer, its preparation method, and its application in catalytic synthesis of isoprene
A technology of isoprene and catalysts, which is applied in the direction of carbon compound catalysts, catalyst activation/preparation, catalysts, etc., and can solve the problems of catalyst activity decay and short service life
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[0071]The present invention also provides a method for preparing a carbon layer-coated composite catalyst as described in any one of the above technical solutions, characterized in that it comprises the following steps:
[0072] 1) impregnating silica particles into an active component solution to obtain a catalyst precursor;
[0073] 2) After aging and roasting the catalyst precursor obtained in the above steps, an initial catalyst is obtained;
[0074] 3) After the carbon source is coated on the initial catalyst obtained in the above steps, a composite catalyst coated with a carbon layer is obtained.
[0075] In the present invention, the element selection and ratio of the carbon layer-coated composite catalyst in the above preparation method, as well as the corresponding optimization principle, and the selection and ratio of the corresponding elements in the aforementioned carbon layer-coated composite catalyst, and the corresponding preference The principles can be corres...
Embodiment 1
[0138] (1) Take 1.50g CrO 3 , 0.61g ammonium molybdate and 1.63g phosphoric acid were dissolved in 13ml deionized water to make an impregnation solution; take 10g spherical SiO 2 , adding the impregnating solution to the SiO 2 On the carrier, the catalyst body precursor is obtained;
[0139] (2) Aging the catalyst precursor described in (1) at 20°C for 12h; then drying with a gradient temperature rise, keeping at 70°C for 1.5h, 85°C for 1.5h, 105°C for 1.5h, and 120°C for 5h; finally, 500°C Roasting at ℃ for 5h to obtain the initial catalyst;
[0140] (3) Using trimethylbenzene as a solvent, prepare a 40wt% furfuryl alcohol solution, add a small amount of oxalic acid as a catalyst, impregnate the initial catalyst obtained in (2) twice with furfuryl alcohol solution in equal volume, dry at 50°C for 10h, and dry at 90°C for 6h ;
[0141] (4) Place the catalyst obtained in (3) in an atmosphere furnace, under the protection of high-purity argon, raise the temperature to 550°C ...
Embodiment 2
[0152] (1) Take 1.20g Cr 2 o 3 , 0.24g ammonium molybdate and 1.63g phosphoric acid were dissolved in 13ml deionized water to make an impregnation solution; take 10g spherical SiO 2 , adding the impregnating solution to the SiO 2 On the carrier, the catalyst body precursor is obtained;
[0153] (2) Aging the catalyst precursor described in (1) at 25°C for 24h; then drying with gradient temperature increase, keeping at 70°C for 1.5h, 85°C for 1.5h, 105°C for 1.5h, and 120°C for 5h; finally, 550°C Roasting at ℃ for 5h to obtain the initial catalyst;
[0154] (3) Using trimethylbenzene as a solvent, prepare 20 wt% furfuryl alcohol solution, add a small amount of oxalic acid as a catalyst, impregnate the initial catalyst obtained in (2) with furfuryl alcohol solution for 3 times, dry at 60°C for 6h, and dry at 80°C for 6h ;;
[0155] (4) Place the catalyst obtained in (3) in an atmosphere furnace, under the protection of high-purity argon, raise the temperature to 650°C at a ...
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