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Platinum-gallium catalyst loaded on double-oxide composite carrier as well as preparation method and application of platinum-gallium catalyst

A composite carrier and double oxide technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst supports, etc., can solve the problem of carbon deposition, deactivation selectivity, and Low propylene selectivity and other problems, to achieve the effect of improving oxygen storage capacity, improving oxygen moving capacity, and high dehydrogenation activity

Active Publication Date: 2015-04-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to solve the technical problems of serious carbon deposition, easy deactivation and low selectivity of existing platinum-based catalysts, and to provide a platinum-gallium catalyst loaded on a double oxide composite carrier Its preparation method and its application in propane dehydrogenation overcome the problems of severe carbon deposition, fast deactivation rate and low propylene selectivity of Pt-based catalysts, thereby improving the yield of propylene, and the catalyst can achieve excellent cycle performance at the same time

Method used

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  • Platinum-gallium catalyst loaded on double-oxide composite carrier as well as preparation method and application of platinum-gallium catalyst
  • Platinum-gallium catalyst loaded on double-oxide composite carrier as well as preparation method and application of platinum-gallium catalyst
  • Platinum-gallium catalyst loaded on double-oxide composite carrier as well as preparation method and application of platinum-gallium catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dissolve 0.5046g of cerium nitrate hexahydrate in 3g of deionized water, and dissolve 1.8g of Al 2 o 3Soak in the above solution, ultrasonic for 30min, dry at room temperature for 12h, and dry at 80°C for 12h;

[0031] (2) Calcining the solid obtained in (1) at 600°C for 3h to obtain the composite oxide support CeO 2 -Al 2 o 3 ;

[0032] (3) Dissolve 0.36g of gallium nitrate in 3g of deionized water, and dissolve 2g of CeO 2 -Al 2 o 3 Immerse in the above solution, then add chloroplatinic acid solution with a concentration of 0.01g / mL, sonicate for 30min, dry at room temperature for 12h, and dry at 80°C for 12h;

[0033] (4) Calcinate the solid obtained in (2) at 600°C for 3h to obtain PtGaOx / CeO 2 -Al 2 o 3 , and finally at 500°C H 2 Reduction under the atmosphere for 1h, the PtxGa / yCeAl catalyst was obtained. where x and y are Ga and CeO respectively 2 In the mass content percentage in the catalyst, x is 3, and y is 10.

[0034] (5) Pt3Ga / 10CeAl 3 T...

Embodiment 2

[0048] Adopt the method of embodiment 1 to react, and its difference is only that the quality of the cerium nitrate hexahydrate of step (1) is 0.2523g, and the obtained catalyst y is 5.

Embodiment 3

[0050] Adopt the method of embodiment 1 to react, and its difference is only that the quality of the cerium nitrate hexahydrate of step (1) is 0.7570g, and the obtained catalyst y is 15.

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Abstract

The invention discloses a platinum-gallium catalyst loaded on double-oxide composite carrier as well as a preparation method and an application of the platinum-gallium catalyst. A CeO2-Al2O3 double-oxide carrier is prepared by using CeO2-Al2O3 double-oxide as a carrier, Pt as an active component and Ga as an assistant in a leaching method; the obtained carrier is steeped into chloroplatinic acid and gallium nitrate solutions, is dried and baked to obtain the catalyst. The catalyst is suitable for low alkane dehydrogenized olefin under a hydrogen atmosphere. Taking propane dehydrogenized propylene as an example, because of the addition of CeO2, lattice oxygen is provided to help inhibiting carbon storage; alloys are formed by Ga and Pt to change acting force of products and reactants and Pt in activity center, and Ga is embedded into the lattice of CeO2, so that the oxygen storage and oxygen moving capability of CeO2 are improved. Because of the addition of CeO2 and Ga, the selectivity of propylene and the carbon storage resisting capability are improved, and the relatively-high reaction stability of the catalyst under a high-temperature condition is guaranteed.

Description

technical field [0001] The present invention relates to a kind of loaded catalyst and its preparation method and application, specifically, relate to a kind of catalyst loaded on CeO 2 -Al 2 o 3 PtGa catalyst on double oxide composite support and its preparation method and application in dehydrogenation of low paraffins to olefins (taking propane dehydrogenation to propylene as an example). Background technique [0002] Propylene is the basic raw material for the three major synthetic materials of plastics, synthetic rubber and synthetic fibers, and is mainly used to produce acrylonitrile, acetone, propylene oxide and other products. At present, the supply of propylene mainly comes from the by-products of naphtha cracking to ethylene and petroleum catalytic cracking processes. However, with the development of shale gas technology, ethane has become cheaper and easier to obtain, and the ethylene production process has also begun to shift from naphtha cracking to ethane ste...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J32/00C07C11/06C07C5/333
CPCY02P20/52
Inventor 巩金龙蒋锋曾亮刘刚
Owner TIANJIN UNIV
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