Chroma alumina catalysts for alkane dehydrogenation
A technology of dehydrogenation catalyst and alumina, applied in carbon compound catalysts, catalysts, catalysts for physical/chemical processes, etc., can solve the problems such as very difficult control of temperature distribution of catalytic bed, difficult control of coke distribution, influence of heat, etc.
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Embodiment 2
[0056] Embodiment 2 (with 0.4% SiO 2 Na-silicate impregnation)
[0057] Alumina trihydrate (2700.4 grams) was charged to 10L in the mixer. 24.5g Sodium silica (PQ; 28.7% SiO 2 ) in 80 ml of water was added to the mixer. After the mixer was running for 2 minutes, a solution comprising water (200 grams) and nitric acid (198.0 grams) was added to the mixer. The mixture was mixed for a total of about 20 minutes. The mixture was formed into cylindrical extrudates (1 / 8" diameter), dried overnight at 90 degrees Celsius, and then calcined in air at 800 degrees Celsius for 2 hours. The calcined extrudates were made without external Cool in a cooled furnace.
[0058] A portion (250 g) of the calcined alumina extrudate was impregnated with an aqueous solution of chromic acid (88 g), a sodium dichromate solution (7.7 g, 69% sodium dichromate dihydrate) and water (52 g) To first wet. The samples were dried and calcined in air at 750 degrees Celsius for 2 hours. The impregna...
Embodiment 3
[0059] Embodiment 3 (utilize 1.6%SiO 2 Na-silicate impregnation)
[0060] Alumina trihydrate (2700.4 grams) was charged to 10L in the mixer. 98.3g Sodium silica (PQ; 28.7% SiO 2 ) solution was added to the mixer. After the mixer was running for 2 minutes, a solution comprising water (200 grams) and nitric acid (198.0 grams) was added to the mixer. The mixture was mixed for a total of about 20 minutes. The mixture was formed into cylindrical extrudates (1 / 8" diameter), dried overnight at 90 degrees Celsius, and then calcined in air at 800 degrees Celsius for 2 hours. The calcined extrudates were made without external Cool in a cooled furnace.
[0061] A portion (250 g) of the calcined alumina extrudate was impregnated with an aqueous solution of chromic acid (87.7 g), sodium dichromate solution (3 g, 69% sodium dichromate dihydrate) and water (49 g) To first wet. The samples were dried and calcined in air at 750 degrees Celsius for 2 hours. The impregnated extru...
Embodiment 4
[0062] Embodiment 4 (with colloidal silicon dioxide 0.5% SiO 2 co-extrusion)
[0063] Alumina trihydrate (2700.4 grams) was charged to 10L in the mixer. 33.75 grams of colloidal silicon dioxide ( 2327) in 50 ml of water was added to the mixer. After the mixer was running for 2 minutes, a solution comprising water (290 grams) and nitric acid (132.0 grams) was added to the mixer. The mixture was mixed for a total of about 20 minutes. The mixture was formed into cylindrical extrudates (1 / 8" diameter), dried overnight at 90 degrees Celsius, and then calcined in air at 800 degrees Celsius for 2 hours. The calcined extrudates were made without external Cool in a cooled furnace.
[0064] A portion (250 g) of the calcined alumina extrudate was impregnated with an aqueous solution of chromic acid (82.4 g), a sodium dichromate solution (12.4 g, 69% sodium dichromate dihydrate) and water (58.8 g) To first wet. The samples were dried and calcined in air at 750 degrees Cels...
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