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Quaternary platinum-based catalyst for propane dehydrogenation to propylene, preparation method and application thereof

A propane dehydrogenation and catalyst technology, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of catalyst activity, selectivity, high catalyst manufacturing cost, and high content of metal components. To achieve the effect of improving the degree of reduction and utilization efficiency, less carbon deposition, and high reactivity

Active Publication Date: 2017-04-19
HUALU ENG & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it adopts the equal volume impregnation method to load metal components on the alumina carrier, the preparation process is long and the energy consumption is large
In addition, the reaction uses nitrogen as a diluent gas, which increases the difficulty of subsequent separation
[0006] Although a large number of research reports on the catalytic dehydrogenation of propane to propylene have been reported, the manufacturing cost of the catalyst is high (the content of the metal component is high), the production cycle is long (the production process is complicated), the activity and selectivity of the catalyst are not ideal, and the stability The problem is also more prominent

Method used

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  • Quaternary platinum-based catalyst for propane dehydrogenation to propylene, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Select spherical γ-Al with a diameter of 1.5-3mm 2 o 3 The carrier is pretreated, and the carrier is loaded into the constant temperature zone of the quartz reactor. After the temperature is raised to 600°C, the PH 3 , kept for 3 hours, and then placed in a muffle furnace, baked at 540°C for 3 hours.

[0032] It is the platinum nitrate that Pt content is 0.25g, the tin protochloride that Sn content is 0.3g, the potassium chloride that K content is 0.8g and the cerium nitrate that Ce content is 0.6g are mixed uniformly, and above-mentioned mixed solution is poured into 98.05 g the treated alumina carrier, then heated to 90°C and stirred for 3h, dried at 100°C for 5h, placed in a muffle furnace and calcined at 550°C for 6h to obtain a catalyst.

[0033] The catalytic activity of propane dehydrogenation to propylene was determined in a fixed bed reactor. Concrete reaction condition is as follows: catalyst consumption is 0.5g, and reaction pressure is normal pressure, an...

Embodiment 2

[0035] Select spherical γ-Al with a diameter of 1.5-3mm 2 o 3 The carrier is pretreated, and the carrier is loaded into the constant temperature zone of the quartz reactor. After the temperature is raised to 650°C, the PH 3 , kept for 3 hours, and then placed in a muffle furnace, baked at 540°C for 3 hours.

[0036] Pour the sodium chloride solution containing 0.7g of Na into 97.25g of the treated alumina carrier, then heat to 95°C and stir for 3h, then place in an oven, dry at 100°C for 6h, and finally roast at 550°C for 5h to obtain the catalyst precursor body.

[0037] According to the above method, Zn is impregnated on the catalyst precursor, Zn comes from zinc nitrate, and its Zn content is 1.3g; then Pt is impregnated on the catalyst precursor of the previous step, Pt comes from platinum nitrate, and its Pt content is 0.25g; Finally, Sn is impregnated, the Sn source is stannous chloride, and its Sn content is 0.5g to obtain the catalyst.

[0038] Utilize the method o...

Embodiment 3

[0040] Select spherical γ-Al with a diameter of 1.5-3mm 2 o 3 The carrier is pretreated, and the carrier is loaded into the constant temperature zone of the quartz reactor. After the temperature is raised to 600 ° C, NH is injected at normal pressure. 3 , kept for 3 hours, and then placed in a muffle furnace, baked at 600°C for 3 hours.

[0041] Mix platinum nitrate with a Pt content of 0.2g, stannous chloride with a Sn content of 0.3g, calcium nitrate with a Ca content of 1.0g, and lanthanum nitrate with a La content of 0.9g, and pour the above mixed solution into 97.6g The treated alumina carrier was then heated to 95° C. and stirred for 4 hours, dried at 100° C. for 6 hours, and finally placed in a muffle furnace for calcination at 550° C. for 6 hours to obtain a catalyst.

[0042] Utilize the method of embodiment 1 to measure its catalytic activity of propane dehydrogenation to propylene reaction.

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Abstract

The invention discloses a quaternary platinum-based catalyst used for production of propylene through propane dehydrogenation, and a preparation method and an application thereof. The catalyst treats alumina processed by an alkaline gas as a carrier, precious metal Pt and metal Sn as active components, and M1 and M2 as assistants, M1 is one selected from Na, K, Rb, Mg, Ca and Sr, and M2 is one selected from La, Ce, Pm, Sm, Ti, Ga, In, Zn and Fe. The finally obtained catalyst comprises 0.2-0.3wt% of Pt, 0.1-2wt% of Sn, 0.5-2wt% of M1 and 0.5-2wt% of M2. The preparation method of the catalyst comprises the following steps: preprocessing the alumina carrier by the alkaline gas, and loading Pt, Sn, M1 and M2 through an impregnation process. The catalyst prepared through the method has the advantages of low price, simple operation, high reaction activity, good propylene selectivity, long single-use life and the like when the catalyst is used to catalyze a production reaction of propylene through propane dehydrogenation.

Description

technical field [0001] The invention relates to a catalyst for producing propylene by dehydrogenation of propane, a preparation method and application thereof, in particular to a quaternary platinum-based catalyst for producing propylene by dehydrogenation of propane, a preparation method and application. Background technique [0002] Propylene is an important chemical raw material, which can be used to synthesize materials such as polypropylene, polyacrylonitrile, acrolein and propylene oxide, and can also be used to produce plastics, polypropylene fiber, organic glass, epoxy resin and other products. Propylene is the basic raw material of the three major synthetic materials, and its consumption is second only to ethylene. With the rapid growth of demand for derivatives such as polypropylene, the demand for propylene is also increasing year by year. Propylene produced by traditional petroleum steam cracking and catalytic cracking methods is far from meeting the rapidly gro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J23/62B01J23/89C07C11/06C07C5/333
CPCY02P20/52
Inventor 邬慧雄山秀丽高建红赵秋松
Owner HUALU ENG & TECH
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