Process for preparing catalyst for preparing propylene with propane dehydrogenation in carbonic anhydride condition and uses thereof

Abstract

The invention pertains to the technical field of catalyst, particularly relating to a method for preparing propylene catalyst by propane dehydrogenation under carbon dioxide atmosphere and an application thereof. The catalysts currently used in the reaction have the disadvantages of low activity, poor stability, high price, etc. HZSM-5 ziolite is treated with high-temperature water vapor, and theziolite is then taken as a carrier and zinc oxide is taken as an active ingredient to prepare catalyst by the impregnation method of the prior art. The catalyst is applied to the reaction for preparing propylene by propane dehydrogenation under carbon dioxide atmosphere, and the catalyst has the advantages of simple operation, high activity, sound stability, low cost, etc..

Description

technical field

[0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and application of a catalyst for propane dehydrogenation to propylene under a carbon dioxide atmosphere. Background technique

[0002] Propylene is an important industrial raw material, which can be used to synthesize materials such as polypropylene, acrolein, acrylic acid and propylene oxide, and also to produce a series of derivatives, such as: plastic, polypropylene fiber, organic glass and epoxy resin. The global demand for propylene is very large, and relying on the steam cracking and catalytic cracking technologies currently relying on petroleum is far from being able to meet the rapidly growing demand for propylene. Petroleum resources are becoming increasingly tight and prices are rising, and the production of propylene from abundant and cheap propane dehydrogenation has attracted widespread attention.

[0003] Although the pure dehydr...

Examples

example 1

[0021] Example 1: Zn(NO 3 ) 2 Soluble in water to make solution, Zn 2+ The concentration is 0.0021g / mL, and the HZSM-5 zeolite with a silicon-alumina ratio of 25 is treated with steam at 650°C for 6 hours, and then added to the above-mentioned Zn(NO 3 ) 2 In the solution, mix evenly to form a suspension, the liquid-solid ratio is 20mL / g when adding, heat and stir the suspension under an infrared lamp, evaporate to dryness, dry at 100°C for 24 hours, and roast at 600°C in an air atmosphere for 6 hours, Catalyst-1 was obtained, wherein the loading amount of the active component zinc oxide was 5 wt%. The reactivity of propane dehydrogenation under carbon dioxide atmosphere was determined in a continuous microreactor. The specific reaction conditions are as follows: the amount of catalyst is 0.2g, the reaction pressure is 1atm, the total flow rate of reaction gas is 20mL / min, wherein the flow rate of propane is 0.5mL / min, the flow rate of carbon dioxide is 1mL / min, and the res...

example 2

[0022] Example 2: Utilize the method of example 1 to measure catalyst-1 in CO 2 The stability of the propane dehydrogenation reaction under the atmosphere, after 30 hours of reaction, the yield of propylene was 20.3%, and the selectivity of propylene was 65.6%.

example 3

[0023] Example 3: Zn(CH 3 COO) 2 Soluble in water to make solution, Zn 2+ The concentration is 0.0014g / mL, the HZSM-5 zeolite with a silicon aluminum ratio of 25 is treated with steam at 600°C for 5 hours, and then added to the above Zn(CH 3 COO) 2 In the solution, mix evenly to form a suspension. When adding, the liquid-solid ratio is 30mL / g. The suspension is heated and stirred under an infrared lamp, evaporated to dryness, dried at 110°C for 12 hours, and roasted at 600°C in an air atmosphere for 8 hours. Catalyst-2 was obtained, wherein the loading amount of the active component zinc oxide was 5 wt%. Utilize the method of example 1 to measure its CO 2 Propane dehydrogenation activity under atmosphere. At steady state, the propylene yield on Catalyst-2 was 21.4%, and the propylene selectivity was 74.1%.

technical field

[0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and application of a catalyst for propane dehydrogenation to propylene under a carbon dioxide atmosphere. Background technique

[0002] Propylene is an important industrial raw material, which can be used to synthesize materials such as polypropylene, acrolein, acrylic acid and propylene oxide, and also to produce a series of derivatives, such as: plastic, polypropylene fiber, organic glass and epoxy resin. The global demand for propylene is very large, and relying on the steam cracking and catalytic cracking technologies currently relying on petroleum is far from being able to meet the rapidly growing demand for propylene. Petroleum resources are becoming increasingly tight and prices are rising, and the production of propylene from abundant and cheap propane dehydrogenation has attracted widespread attention.

[0003] Although the pure dehydr...

Examples

example 1

[0021] Example 1: Zn(NO 3 ) 2 Soluble in water to make solution, Zn 2+ The concentration is 0.0021g / mL, and the HZSM-5 zeolite with a silicon-alumina ratio of 25 is treated with steam at 650°C for 6 hours, and then added to the above-mentioned Zn(NO 3 ) 2 In the solution, mix evenly to form a suspension, the liquid-solid ratio is 20mL / g when adding, heat and stir the suspension under an infrared lamp, evaporate to dryness, dry at 100°C for 24 hours, and roast at 600°C in an air atmosphere for 6 hours, Catalyst-1 was obtained, wherein the loading amount of the active component zinc oxide was 5 wt%. The reactivity of propane dehydrogenation under carbon dioxide atmosphere was determined in a continuous microreactor. The specific reaction conditions are as follows: the amount of catalyst is 0.2g, the reaction pressure is 1atm, the total flow rate of reaction gas is 20mL / min, wherein the flow rate of propane is 0.5mL / min, the flow rate of carbon dioxide is 1mL / min, and the res...

example 2

[0022] Example 2: Utilize the method of example 1 to measure catalyst-1 in CO 2 The stability of the propane dehydrogenation reaction under the atmosphere, after 30 hours of reaction, the yield of propylene was 20.3%, and the selectivity of propylene was 65.6%.

example 3

[0023] Example 3: Zn(CH 3 COO) 2 Soluble in water to make solution, Zn 2+ The concentration is 0.0014g / mL, the HZSM-5 zeolite with a silicon aluminum ratio of 25 is treated with steam at 600°C for 5 hours, and then added to the above Zn(CH 3 COO) 2 In the solution, mix evenly to form a suspension. When adding, the liquid-solid ratio is 30mL / g. The suspension is heated and stirred under an infrared lamp, evaporated to dryness, dried at 110°C for 12 hours, and roasted at 600°C in an air atmosphere for 8 hours. Catalyst-2 was obtained, wherein the loading amount of the active component zinc oxide was 5 wt%. Utilize the method of example 1 to measure its CO 2 Propane dehydrogenation activity under atmosphere. At steady state, the propylene yield on Catalyst-2 was 21.4%, and the propylene selectivity was 74.1%.