Catalyst for gas phase crotonaldehyde selective hydrogenation crotyl alcohol preparation and preparation method
A crotonaldehyde and selective technology, applied in the field of unsaturated alcohol preparation, can solve problems such as poor stability and easy inactivation, and achieve the effects of easy separation, less generation of three wastes, and good stability
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Embodiment 1
[0023] ZrOCl 2 ·8H 2 O 128.8g was dissolved in 4L water, NH was added under stirring 3 Precipitate with water until the pH value of the solution reaches 9, then seal it and place it in an oven at 90°C for 5 days, finally filter and wash, vacuum dry at 70°C, and then roast at 400°C to obtain zirconium dioxide.
[0024] Prepare an aqueous solution of chloroplatinic acid with a concentration of 3.79g / L, take 7.9mL aqueous solution of chloroplatinic acid and add 1g of zirconium dioxide, stir evenly and let stand for 8 hours, heat to remove water, and then dry at 120°C for 8 hours to obtain a catalyst precursor . Catalyst precursors in H 2 The catalyst was obtained after reduction at 500°C for 1 hour. It can be seen from the XRD spectrum of the catalyst that ZrO 2 Diffraction peak shape is diffuse, which is an amorphous phase.
[0025] The prepared catalyst was applied to the gas-solid phase reaction of crotyl alcohol by selective hydrogenation of crotonaldehyde. The catalyst...
Embodiment 2
[0027] Prepare 100 mL of sodium chloride aqueous solution with a concentration of 0.1 mol / L. Take 0.4mL of sodium chloride aqueous solution and add 1g of zirconium oxide, stir evenly, let stand for 8 hours, heat to remove water, then dry at 120°C for 8 hours, and finally bake in a high-temperature furnace at 400°C for 4 hours to obtain a carrier. Take 7.9 mL aqueous solution of chloroplatinic acid and add it to 1 g carrier, stir evenly and let stand for 8 hours, heat to remove water, and then dry at 120° C. for 8 hours to obtain a catalyst precursor. Catalyst precursors in H 2 The catalyst was obtained after reduction at 500°C for 1 hour. The prepared catalyst was applied to the gas-solid phase reaction of selective hydrogenation of crotonaldehyde to crotyl alcohol. The conversion rate of crotonaldehyde and the selectivity of crotyl alcohol are shown in Table 1. It can be seen from the XRD spectrum of the catalyst that ZrO 2 Diffraction peak shape is diffuse, which is an am...
Embodiment 3
[0029] Prepare 100 mL of sodium chloride aqueous solution with a concentration of 0.1 mol / L. Take 0.8mL of sodium chloride aqueous solution and add 1g of zirconia, stir evenly and let it stand for 8 hours, heat to remove water, then dry at 120°C for 8 hours, and finally roast in a high-temperature furnace at 400°C for 4 hours to obtain sodium chloride-containing carrier. Then preparation concentration is the chloroplatinic acid aqueous solution of 3.79g / L. Take 7.9 mL aqueous solution of chloroplatinic acid and add it to 1 g carrier, stir evenly and let stand for 8 hours, heat to remove water, and then dry at 120° C. for 8 hours to obtain a catalyst precursor. Catalyst precursors in H 2 The catalyst was obtained after reduction at 500°C for 1 hour. The prepared catalyst was applied to the gas-solid phase reaction of selective hydrogenation of crotonaldehyde to crotyl alcohol. The conversion rate of crotonaldehyde and the selectivity of crotyl alcohol are shown in Table 1. ...
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