Method for preparing propylene by dehydrogenating propane
A propane dehydrogenation and propane technology, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of low propane conversion rate and propylene selectivity, and achieve the goal of improving propane conversion rate and propylene selectivity Effect
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[0015] The preparation method of the coating component of the present invention includes adopting any well-known method for preparing a propane dehydrogenation catalyst. For example, the soluble salt of the active component can be made into a solution to impregnate the substrate, and then dry and roast to obtain the desired coating component; if the coating component contains additives, the substrate can be impregnated with the metal active component first. After separation, the auxiliary agent is impregnated, or the auxiliary agent may be impregnated first, then the active metal component is impregnated, and finally the catalyst coating component is obtained by drying and roasting. It is also possible to impregnate one component, dry and roast, then impregnate other components, and finally dry and roast to obtain the propane dehydrogenation catalyst coating component. There is no requirement for the order of impregnation of each component during the impregnation process. .
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example 1
[0027] This example illustrates the preparation of the gradient structured catalyst of the present invention.
[0028] Take 437.7 grams of pseudo-boehmite (33% alumina content, produced by Qilu Petrochemical Company Catalyst Factory) and add deionized water, stir and age at 50°C for 30 minutes to obtain a uniform slurry with an alumina content of 18% by weight. Adjust pH=2.0 with dilute hydrochloric acid, stir at 50°C for 40 minutes to obtain alumina gel; dry the above gel at 130°C for 4 hours, and then bake at 650°C for 6 hours to obtain γ-alumina.
[0029] Take a certain amount of chloroplatinic acid to make a solution and mix it with the calcined alumina carrier for impregnation. uniform, then dry it at 80°C for 2 hours, then dry it at 120°C for 4 hours, then bake it at 550°C for 2 hours, and bake it at 550°C for 1 hour under the condition of water vapor to obtain a catalyst coating group point.
[0030] Take 100 g of the above-mentioned coating components, add deionized ...
example 2
[0032] This example illustrates the preparation of the gradient structured catalyst of the present invention.
[0033] Gamma-alumina was prepared as described in Example 1.
[0034] Take a certain amount of chloroplatinic acid to make a solution and mix it with the calcined alumina carrier for impregnation. The amount of chloroplatinic acid makes the Pt content after impregnation equivalent to 0.50% of the weight of alumina. Vibrate for 2 hours under the action of ultrasonic waves to make the impregnated Uniform, then dry it at 80°C for 2 hours, then dry it at 120°C for 4 hours, and then bake it in air at 500°C for 4 hours. Then use SnCl 2 The prepared solution is impregnated with the above components so that the SnO content in the catalyst is equivalent to 0.55% of the weight of alumina, dried at 120°C for 4 hours and then baked at 500°C for 4 hours to obtain a coating containing 0.55% SnO and 0.50% Pt components. The coating composition was impregnated with a potassium ni...
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Abstract
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