Preparation method for light alkane dehydrogenation catalyst with non-uniformly distributed active components
A dehydrogenation catalyst, non-uniform distribution technology, applied in the field of catalysis, can solve the problems of insufficient stability and low selectivity of alkane dehydrogenation catalysts
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Embodiment 1
[0035] Weigh 65 grams of chromium trioxide, 5.5 grams of lanthanum nitrate, and 10 grams of sodium nitrate and dissolve them in 80 milliliters of water to obtain an impregnation solution. Take 30 grams of carbon powder and impregnate it with 20 milliliters of impregnation solution as a pre-treated pore-enlarging agent.
[0036] Weigh 250 grams of pseudo-boehmite powder of 80-100 microns, 50 grams of gibbsite powder of 50-100 microns, mix evenly with the pretreated pore-enlarging agent, and then add 200 ml of 10% nitric acid , Knead in a kneader to obtain a paste-like mass. The agglomerate was shaped on an extruder, then dried at 120°C for 6 hours, and calcined at 600°C for 4 hours to obtain a semi-finished catalyst.
[0037] Add 30 milliliters of water to the remaining impregnating liquid, impregnate the semi-finished catalyst with the impregnating liquid, then dry at 120°C for 6 hours, and roast at 760°C for 6 hours to obtain the finished dehydrogenation catalyst a1.
[003...
Embodiment 2
[0045] Weigh 65 grams of chromium trioxide, 6.2 grams of cerium nitrate, and 8 grams of potassium nitrate and dissolve them in 80 milliliters of water to obtain an impregnation solution. After mixing 20 grams of cellulose powder and 20 grams of wood powder, impregnate with 35 milliliters of soaking liquid as a pretreated pore-enlarging agent.
[0046] Weigh 260 grams of pseudo-boehmite powder with a particle size of 150-200 microns, 40 grams of γ-alumina powder with a particle size of 60-100 microns, mix them evenly with the pretreated pore-enlarging agent, and then add 20% nitric acid to the kneader 150 ml were kneaded to obtain a paste-like mass. The agglomerate was shaped on an extruder, then dried at 120°C for 4 hours, and calcined at 600°C for 5 hours to obtain a semi-finished catalyst.
[0047] Add 45 milliliters of water to the remaining impregnation liquid, impregnate the semi-finished catalyst with the impregnation liquid, then dry at 120°C for 6 hours, and roast at ...
Embodiment 3
[0050] Weigh 65 grams of chromium trioxide, 7.2 grams of zirconium oxynitrate, and 6.0 grams of magnesium nitrate and dissolve them in 80 milliliters of water to obtain an impregnation solution. After mixing 20 grams of carbon powder and 10 grams of scallop powder, impregnate with 30 milliliters of soaking liquid as a pretreated pore-enlarging agent.
[0051] Weigh 260 grams of amorphous aluminum hydroxide powder with a particle size of 70-100 microns, 40 grams of pyrenite powder with a particle size of 60-90 microns, mix them evenly with the pretreated pore-enlarging agent, and then add the remaining The dipping solution and 120 ml of 15% nitric acid were kneaded to obtain a paste-like mass. The agglomerate was formed on an extruder, then dried at 120°C for 6 hours, and calcined at 760°C for 8 hours to obtain the finished catalyst a3.
[0052] The propane dehydrogenation reaction performance test method of catalyst a3 is the same as the reaction performance test of catalyst ...
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