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Platinum based catalyst highly dispersed in carrier aluminum oxide as well as preparation method and application thereof

A catalyst and highly dispersed technology, applied in the direction of catalyst activation/preparation, carbon compound catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of activity decline, easy sintering, easy aggregation and growth, etc., to achieve Effect of improving easy sintering and good propane dehydrogenation activity

Inactive Publication Date: 2018-05-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the Pt-based catalyst system is easy to aggregate and grow, the carbon deposition is serious and the selectivity is low, the present invention proposes a catalyst highly dispersed on the carrier Al 2 o 3 Preparation method of Pt-based catalyst and its application in propane dehydrogenation to propylene reaction
The catalyst effectively improves the problems of easy sintering of the catalyst and severe carbon deposits that reduce the activity, and has good propane dehydrogenation activity, propylene selectivity and reaction stability

Method used

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  • Platinum based catalyst highly dispersed in carrier aluminum oxide as well as preparation method and application thereof
  • Platinum based catalyst highly dispersed in carrier aluminum oxide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take Al 2 o 3 The white powder was placed in a 200mL crucible and placed in a muffle furnace. Roast at 600°C for 5h at a heating rate of 5°C / min. Take 1.6g SiO 2 In a 25mL small beaker.

[0029] (2) Take 0.569g of lanthanum nitrate hexahydrate, 0.403g of indium nitrate hexahydrate, and 0.01g of platinum in a 25mL small beaker, add 0.6mL of deionized water to dissolve.

[0030](3) Add 0.646g of citric acid monohydrate and 0.039mL of ethylene glycol into the above solution, stir to dissolve and mix well.

[0031] (4) Add the solution obtained in (3) dropwise to the Al in (1) 2 o 3 On the carrier, let it stand at room temperature to make it fully impregnated for 24 hours to obtain a gel-like solid.

[0032] (5) Dry the above-mentioned gelatinous solid at 80°C for 6h and at 120°C for 12h, and then bake the dried product in a muffle furnace at 350°C for 2h and at 700°C for 5h to obtain LaIn 1-y Pt y o 3 / Al 2 o 3 catalyst precursor.

[0033] (6) LaIn with 0....

Embodiment 2

[0044] The method of Example 1 was used for the reaction, the only difference being that the mass percentage of Pt in the total mass of the catalyst was 0.2%.

Embodiment 3

[0046] The method of Example 1 was used for the reaction, the only difference being that the mass percentage of Pt in the total mass of the catalyst was 1%.

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Abstract

The invention discloses a Pt based catalyst highly dispersed in a carrier Al2O3 as well as a preparation method and application thereof. The Pt based catalyst highly dispersed in the carrier Al2O3 takes Al2O3 as the carrier, takes In2O3 and La2O3 as auxiliaries and takes metal Pt as an active ingredient; based on the total mass of the catalyst, the catalyst is prepared from the following components in percentage by mass: 0.2-2% of Pt, 7-9% of In2O3, 10-12% of La2O3, 75-85% of Al2O3, and the catalyst can be applied in propane dehydrogenation. The Pt based catalyst has the advantages that the Ptand In are doped into perovskite B, so that Pt and In are uniformly dispersed into a perovskite structure in aspect of atomic level, and the reduced PT particles and indium oxide are highly dispersedand distributed onto the carrier aluminum oxide; the Pt particle diameter is small, and indium oxide particles and lanthanum oxide particles are distributed among the particles to achieve the blocking effect, so that Pt is not liable to reunite at a high temperature, and more active sites are exposed, and therefore, activity and stability of reaction are improved.

Description

technical field [0001] The invention belongs to the technical field of metal catalysts, and in particular relates to a platinum-based catalyst highly dispersed on a carrier aluminum oxide and a preparation method and application thereof. 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 polypropylene, acrylonitrile, isopropanol, acetone and propylene oxide. With the vigorous development of the economy and downstream industries of propylene, correspondingly, the demand for propylene also increases. At present, propylene mainly comes from the by-products of naphtha steam cracking and fluid catalytic cracking. However, with the continuous shortage of oil and rising prices, the propylene production of these two processes is far from meeting the domestic demand for propylene. Therefore, accelerating the research on other production processes of propyle...

Claims

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Application Information

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IPC IPC(8): B01J23/63C07C5/333C07C11/06
CPCC07C5/3337B01J23/63B01J37/0205B01J37/08B01J37/18C07C2523/63C07C2523/42B01J35/394B01J35/393C07C11/06Y02P20/52
Inventor 张立红杨晓宁红岩李鹰霞刘雅甜陈兴业李佳鑫
Owner TIANJIN UNIV
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