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A kind of preparation method of ternary platinum-based catalyst

A catalyst and co-catalyst technology, used in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of uneven distribution of active components, large amount of precious metal Pt, Complex operation steps and other problems, to achieve the effect of maintaining high activity, shortening preparation time, and avoiding elapse

Active Publication Date: 2017-07-28
NINGBO HAIYUE NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has the advantages of less precious metal consumption, high catalyst reactivity, good selectivity, and less carbon deposition on the catalyst, it also has the problems of complicated operation steps and uneven distribution of active components.
[0005] The Chinese invention patent application "Platinum-based catalyst and its preparation method, application and preparation method of propylene" (application number: CN201310229758.8) with application publication number CN104226307A also discloses a method for preparing a platinum-based catalyst. Aluminum is used as a carrier, and Pt, Sn, and In are used as active components to prepare a platinum-based three-way catalyst for propane dehydrogenation to propylene by ultrasonic-assisted impregnation. Although this method has the advantages of simple preparation process, uniform dispersion of active components, and high catalytic activity, etc. characteristics, but this method also has the defects of large amount of precious metal Pt and high preparation cost

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  • A kind of preparation method of ternary platinum-based catalyst

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Embodiment 1

[0025] The preparation method of the ternary platinum-based catalyst of the present embodiment may further comprise the steps:

[0026] (1) Potassium hexachloroplatinate, tin tetrachloride, antimony acetate and aluminum nitrate were weighed respectively according to the loads of Pt, Sn and Sb being 0.2wt%, 1.5wt%, and 3wt% of the catalyst weight;

[0027] (2) Dissolve the potassium hexachloroplatinate, tin tetrachloride, antimony acetate and aluminum nitrate taken in step (1) in deionized water and stir evenly, then add citric acid and dodecane to the solution Sodium sulfate is prepared into the solution that concentration is 0.08mol / L, and in this solution, the mol ratio of citric acid, sodium lauryl sulfate, total cation number is 1:1:1;

[0028] (3) The solution obtained in step (2) is adjusted to a pH of 6 with 0.2mol / L NaOH solution, and then the solution is concentrated into a saturated solution under a water bath heating condition of 40° C., and then the saturated solut...

Embodiment 2

[0032] The preparation method of the ternary platinum-based catalyst of the present embodiment may further comprise the steps:

[0033] (1) According to the loads of Pt, Sn, and Sb being respectively 0.2wt%, 2wt%, and 3wt% of the catalyst weight, weigh ammonium hexachloroplatinate, stannous chloride, antimony chloride, and aluminum isopropoxide ;

[0034] (2) Dissolve the ammonium hexachloroplatinate, stannous chloride, antimony chloride and aluminum isopropoxide taken in step (1) in ethanol and stir evenly, then add citric acid and ten Dialkyl sodium sulphate is prepared into the solution that concentration is 0.05mol / L, and in this solution, the mol ratio of citric acid, sodium lauryl sulphate, total cation number is 1:0.5:1;

[0035] (3) The solution obtained in step (2) is adjusted to a pH of 4 with 0.2mol / L NaOH solution, and then the solution is concentrated into a saturated solution under a water bath heating condition of 90° C., and then the saturated solution is heat...

Embodiment 3

[0039] The preparation method of the ternary platinum-based catalyst of the present embodiment may further comprise the steps:

[0040] (1) Take platinum acetylacetonate, tin tetrachloride, antimony acetate and aluminum nitrate respectively according to the loads of Pt, Sn, and Sb being respectively 0.3wt%, 1.5wt%, and 2.5wt% of the catalyst weight;

[0041] (2) Dissolve the potassium hexachloroplatinate, tin tetrachloride, antimony acetate and aluminum nitrate taken in step (1) in deionized water and stir evenly, then add citric acid and dodecane to the solution Sodium sulfate is prepared into the solution that concentration is 0.1mol / L, and in this solution, the mol ratio of citric acid, sodium lauryl sulfate, total cation number is 3:2.5:1;

[0042] (3) The solution obtained in step (2) is adjusted to a pH of 5 with 0.2mol / L NaOH solution, and then the solution is concentrated into a saturated solution under a water bath heating condition of 60° C., and then the saturated s...

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Abstract

The present invention relates to a kind of preparation method of ternary platinum-based catalyst, and this ternary platinum-based catalyst uses Al 2 o 3 As the carrier, Pt and Sn are the main active components, and Sb is the co-catalyst component. The present invention adopts the citric acid method to prepare the ternary platinum-based catalyst. The use of citric acid greatly shortens the time of the whole preparation process and improves the production efficiency; during the preparation process, the amount of each precursor can be accurately added according to the calculated amount, and each precursor The body has almost no loss in the whole process, thereby realizing the precise control of the content of each component of the catalyst; the preparation method of the present invention is compared with the commonly used impregnation method in the prior art, the preparation time is greatly shortened, and the loss of active components is avoided. , and the addition of sodium lauryl sulfate can enable the catalyst to obtain a larger specific surface area and pore size, so that each active component can be uniformly dispersed in the catalyst, thereby improving the conversion rate of propane and the selectivity of propylene.

Description

technical field [0001] The invention relates to the technical field of platinum-based catalysts, in particular to a preparation method of a ternary platinum-based catalyst for propane dehydrogenation to propylene. Background technique [0002] At present, due to the increasing demand for polypropylene, propylene oxide and acrylic acid, the demand for propylene is showing a rising trend. However, the growth rate of propylene production capacity is far lower than the growth rate of propylene demand, and the gap between supply and demand is increasing year by year. Therefore, the technology of increasing propylene production has become a research hotspot in petrochemical technology. Especially in recent years, with the development of shale gas technology and the high price of propylene, the production of propylene through the cheap and easy-to-obtain propane dehydrogenation technology has set off an upsurge in the world, especially in China. Therefore, the research on catalyti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62B01J35/10C07C5/333C07C11/06
CPCY02P20/52
Inventor 田金石邓生鑫
Owner NINGBO HAIYUE NEW MATERIAL