Method for catalytically synthesizing isoprene and method for preparing catalyst used
A technology of isoprene and catalysts, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve harsh reaction conditions, high production costs, and complex processes and other problems, to achieve the effect of mild process conditions and low equipment requirements
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Embodiment 1
[0024] One, catalyst preparation, carry out according to the following steps sequence:
[0025] 1. First, γ-Al 2 o 3 Calcined at 300°C for 4h to remove γ-Al 2 o 3 Physically adsorbed impurities in
[0026] 2. The treated γ-Al 2 o 3 impregnated in tetrachloropalladium acid (H 2 PdC1 4 ) in aqueous solution for 24 hours, filter, wash the filter cake with distilled water for 10 minutes, then soak the filter cake in NaOH solution with a concentration of 0.3% for 40 minutes, filter, dry at 120°C for 12 hours, and finally place it in a muffle furnace and roast at 400°C for 4 hours. Obtained sample Pd-Al 2 o 3 .
[0027] 3. The resulting Pd-Al 2 o 3 Immersed in a concentration of 3.5% (mass percentage) vanadium (V (NO 3 ) 5 ) solution for 30 hours, filtered, washed the filter cake with distilled water for 10 minutes, dried at 120°C for 12 hours, and finally placed in a muffle furnace for 4 hours at 350°C to obtain the sample Pd / V-Al 2 o 3 .
[0028] 4. The resulting ...
Embodiment 2
[0035] One, catalyst preparation, carry out according to the following steps sequence:
[0036] 1. First, γ-Al 2 o 3 Calcined at 300°C for 7h to remove γ-Al 2 o 3 Physically adsorbed impurities in
[0037] 2. The γ-Al after (1) treatment 2 o 3 impregnated in tetrachloropalladium acid (H 2 PdC1 4) in aqueous solution for 48 hours, filter, wash the filter cake with distilled water for 10 minutes, then soak the filter cake in NaOH solution with a concentration of 0.7% for 40 minutes, filter, dry at 120°C for 12 hours, and finally place it in a muffle furnace and roast at 350°C for 4 hours. Obtained sample Pd-Al 2 o 3 .
[0038] 3. The Pd-Al obtained in (2) 2 o 3 impregnated in a concentration of 6% (mass percentage) vanadium (V (NO 3 ) 5 ) solution for 48 hours, filtered, washed the filter cake with distilled water for 10 minutes, dried at 120°C for 12 hours, and finally placed in a muffle furnace for 4 hours at 350°C to obtain the sample Pd / V-Al 2 o 3 .
[0039]...
Embodiment 3
[0046] One, catalyst preparation, carry out according to the following steps sequence:
[0047] 1. First, roast γ-Al2O3 at 320°C for 6 hours to remove γ-Al 2 o 3 Physically adsorbed impurities in
[0048] 2. The γ-Al after (1) treatment 2 o 3 impregnated in tetrachloropalladium acid (H 2 PdC1 4 ) in aqueous solution for 36 hours, filter, wash the filter cake with distilled water for 10 minutes, then soak the filter cake in 0.5% NaOH solution for 40 minutes, filter, dry at 120°C for 20 hours, and finally place it in a muffle furnace and roast at 400°C for 8 hours. Obtained sample Pd-Al 2 o 3 .
[0049] 3. The Pd-Al obtained in (2) 2 o 3 Immersed in a concentration of 4.50% (mass percentage) vanadium (V (NO 3 ) 5 ) in aqueous solution for 36h, filtered, washed the filter cake with distilled water for 10min, dried at 120°C for 12h, and finally placed in a muffle furnace and roasted at 420°C for 10h to obtain the sample Pd / V-Al 2 o 3 .
[0050] 4. The Pd / V-Al obtain...
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