Platinum aluminium oxide series catalyst for preparing propylene by propane dehydrogenation and preparation method of catalyst

A technology of propane dehydrogenation, platinum alumina, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the limitations of chromium catalyst use, short catalyst life, Toxic problems such as metal chromium, to achieve the effect of easy to enlarge production and industrialization, less carbon deposition, slow decline in activity

Inactive Publication Date: 2014-10-08
HUALU ENG & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst life is short, the conversion rate drops significantly within tens of minutes, and the selectivity is not high, the catalyst may need to be regenerated frequently to maintain the reaction
In addition, metal chromium is poisonous, and the use of chromium catalysts is subject to certain restrictions.

Method used

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  • Platinum aluminium oxide series catalyst for preparing propylene by propane dehydrogenation and preparation method of catalyst
  • Platinum aluminium oxide series catalyst for preparing propylene by propane dehydrogenation and preparation method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0035]Platinum nitrate with a Pt content of 0.3 g, stannous chloride with a Sn content of 0.4 g, potassium nitrate with a K content of 0.6 g and cerium nitrate with a Ce content of 0.8 g were dissolved in 1% dilute nitric acid, and then 97.9 Pour g nano-alumina carrier into the above mixed solution, add an appropriate amount of 1% dilute nitric acid to ensure that the nano-alumina is completely immersed in the solution, then heat to 95°C, stir for 2h, filter and dry at 100°C for 6h, set it to The catalyst was obtained by roasting at 550℃ for 8h in a muffle furnace to obtain a catalyst for dehydrogenation of propane to propylene.

Embodiment 2

[0037] Dissolve platinum nitrate with a Pt content of 0.3 g in 2% dilute nitric acid, then pour 137.3 g of pseudo-boehmite into the above mixed solution, add an appropriate amount of 1% dilute nitric acid to ensure complete impregnation of pseudo-boehmite In the solution, it was heated to 88°C, stirred for 2h, filtered, then placed in an oven, dried at 100°C for 8h, and finally calcined at 550°C for 4h to obtain the catalyst precursor for dehydrogenation of propane to propylene.

[0038] According to the above method, Sn was impregnated on the catalyst precursor in the previous step. The source of Sn was stannous chloride, and the Sn content was 1.8 g. Finally, Na and Zn were impregnated on the catalyst precursor. Na and Zn were respectively obtained from nitric acid. The contents of sodium and zinc nitrate are 0.6 g and 1.2 g respectively, to obtain a catalyst for dehydrogenation of propane to propylene.

Embodiment 3

[0040] Dissolve barium nitrate and cerium nitrate containing 0.7 g and 1.3 g of Ba and Ce in 1% dilute nitric acid, then pour 97.0 g of alumina microspheres into the above mixed solution, add an appropriate amount of 2% dilute nitric acid to Make sure that the alumina microspheres are completely immersed in the solution, then heated to 95°C, stirred for 3h, filtered, placed in an oven, dried at 100°C for 6h, and finally calcined at 550°C for 5h to obtain the catalyst precursor for propane dehydrogenation to propylene.

[0041] According to the above method, Sn was impregnated on the catalyst precursor in the previous step. The Sn source was stannous chloride, and the Sn content was 0.7 g. Finally, Pt was impregnated on the catalyst precursor. Pt came from platinum nitrate, and its Pt content was It is 0.3g, and the catalyst for dehydrogenation of propane to propylene is obtained.

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Abstract

The invention discloses a platinum aluminium oxide series catalyst for preparing propylene by propane dehydrogenation and a preparation method of the catalyst. The catalyst is as shown in a formula PtSnX1X2/Al2O3, wherein in the formula, the content of noble metal Pt is 0.25%-0.35%, the content of metal Sn is 0.1%-3.5%, the total contents of auxiliaries X1 and X2 are 0.5%-3%, and X1 and X2 are selected from one of K, Ga, Zr, Cu, Mg, Zn, Ba, La, Y, Tm, Fe, Na, Cl, Zn, Ce, Sc and Sb. The platinum aluminium oxide series catalyst provided by the invention has the advantages that propylene dehydrogenation is catalyzed by adopting the catalyst at the reaction temperature of 590-650 DEG C at the pressure of less than 0.25Mpa, so as to obtain stable propane conversion rate and propylene selectivity greater than 95.8% are obtained; the single service life of the catalyst is long, the noble metals are not lost, and the catalyzing property of the catalyst after regeneration is good.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing a platinum-alumina series catalyst for propane dehydrogenation to propylene. Background technique [0002] Propylene is a very important chemical raw material and the basic raw material of the three major synthetic materials. It is mainly used to produce acrylonitrile, isopropylene, acetone and propylene oxide, 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. As of 2011, there are about 20 sets of propane dehydrogenation to propylene (PDH) manufacturers in the world, with a total production capacity of about 6.54 million tons per year. In 2012, the global propylene production capacity was 104 million tons, and the demand for propylene derivatives (calculated as propylene) reached 88.7 million tons. By 201...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/62B01J23/89B01J23/644C07C11/06C07C5/333
CPCY02P20/52Y02P20/584
Inventor 山秀丽林涛邬慧雄万克柔赵秋松程杰高建红张之翔
Owner HUALU ENG & TECH
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