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Platinum catalyst supported on double-oxide composite carrier and preparation method and application of platinum catalyst

A composite carrier, double oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of fast deactivation rate and easy deactivation selectivity. , platinum catalyst carbon deposition and other problems, to achieve the effect of improving the anti-coking ability, high dehydrogenation activity, and improving propylene selectivity

Active Publication Date: 2014-11-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problems of severe carbon deposition, easy deactivation and low selectivity of existing platinum catalysts, and provides a TiO 2 -Al 2 o 3 Double oxide support and supported Pt / TiO 2 -Al 2 o 3 The preparation method of the catalyst and its application in propane dehydrogenation overcome the problems of serious carbon deposition, fast deactivation rate and low propylene selectivity of Pt-based catalysts, thereby improving the propylene yield

Method used

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  • Platinum catalyst supported on double-oxide composite carrier and preparation method and application of platinum catalyst
  • Platinum catalyst supported on double-oxide composite carrier and preparation method and application of platinum catalyst
  • Platinum catalyst supported on double-oxide composite carrier and preparation method and application of platinum catalyst

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Effect test

Embodiment 1

[0028] (1) Dissolve 8.7g of aluminum sec-butoxide (ATSB), 0.86g of butyl titanate (TTB) and 0.75g of CTAB in 12g of isopropanol, and stir with the rotor for 2 hours;

[0029] (2) Mix 0.705g of 65wt% concentrated nitric acid and 12.5g of deionized water, add the mixed solution dropwise to the precursor solution for hydrolysis, and the hydrolysis time is 0.5h;

[0030] (3) Leave the resulting gel to age for 24 hours, then remove the solvent, dry at 70°C for 20 hours, and bake at 600°C for 3 hours to obtain TiO 2 -Al 2 o 3 Composite carrier;

[0031] (4) TiO 2 -Al 2 o 3 The composite carrier is immersed in a chloroplatinic acid solution with a concentration of 0.01g / ml, ultrasonicated for 0.5h, and dried at room temperature for 12h;

[0032] (5) Drying at 90°C for 12h, and calcination at 600°C for 3h, the obtained PtO 2 / TiO 2 -Al 2 o 3 Catalyst; finally in H 2 Reduction under atmosphere for 1h to obtain Pt / TiO 2 -Al 2 o 3 catalyst.

[0033] Obtained TiO 2 -Al 2 ...

Embodiment 2

[0047] Adopt embodiment 1 method to react, its difference is only that in the step (1) aluminum sec-butoxide (ATSB) consumption is 9.2g, and butyl titanate (TTB) consumption is 0.43g, in the gained catalyst TiO 2 The mass percentage content is 5%. The resulting TiO 2 -Al 2 o 3 The XRD spectrum of the carrier is as figure 1 As shown, the obtained Pt / TiO after reduction 2 -Al 2 o 3 The XRD spectrum of the catalyst is as figure 2 shown.

Embodiment 3

[0049] Adopt embodiment 1 method to react, and its difference is only that in the step (1) aluminum sec-butoxide (ATSB) consumption is 7.7g, and butyl titanate (TTB) consumption is 1.72g, and in the gained catalyst TiO 2 The mass percentage is 20%. Obtained TiO 2 -Al 2 o 3 The XRD spectrum of the carrier is as figure 1 As shown, the obtained Pt / TiO after reduction 2 -Al 2 o 3 The XRD spectrum of the catalyst is as figure 2 shown.

[0050] From figure 1 It can be seen that the composition of the obtained support is TiO 2 and Al 2 o 3 , verified as a double oxide composite support; when TiO 2 At 5% content, no TiO 2 peak appears when TiO 2 When the mass percentage reaches 10%, TiO appears 2 Diffraction peaks and their peak intensity varies with TiO 2 The mass percentage of Al increases and continuously strengthens, while Al 2 o 3 The intensity of the peak decreases continuously, thus proving that the TiO 2 Distributed in Al 2 o 3 surface and are highly disp...

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Abstract

The invention discloses a platinum catalyst supported on a double-oxide composite carrier and a preparation method and an application of the platinum catalyst. The catalyst takes TiO2-Al2O3 double oxides as a carrier; the supported active component is Pt; the mass percentage content of Pt is 0.5-1.5%. The preparation method comprises the following steps: preparing the TiO2-Al2O3 double-oxide carrier by using a sol-gel method, subsequently dipping the obtained carrier into a chloroplatinic acid solution, drying and roasting, thereby obtaining the Pt / TiO2-Al2O3 catalyst. The catalyst disclosed by the invention is applicable to preparation of propylene by propane dehydrogenation in the presence of hydrogen atmosphere; and due to addition of TiO2, the acting forces between an active center and the product and a reactant are changed, so that the selectivity and the anti-carbon capability of propylene are improved, and relatively good reaction stability of the catalyst under the high temperature is ensured.

Description

technical field [0001] The present invention relates to a kind of loaded catalyst and its preparation method and application, specifically, relates to a kind of loaded on TiO 2 -Al 2 o 3 Pt catalyst on double oxide composite support, its preparation method and its application in propane dehydrogenation to propylene. Background technique [0002] Propylene is the earliest petrochemical raw material used, and it is also one of the important olefins in the production of petrochemical products. It is mainly used to produce chemical products such as polypropylene, acrylonitrile, propylene oxide, acrylic acid, acrolein, phenol and butanooctanol. At present, propylene mainly comes from petroleum cracking to produce ethylene and the by-products of petroleum catalytic cracking. Due to factors such as petroleum supply and product distribution, the traditional process of producing propylene can no longer meet the existing market demand. In recent years, with the rapid development of...

Claims

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Application Information

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IPC IPC(8): B01J23/42C07C5/333C07C11/06
CPCC07C5/3337B01J23/42C07C2523/42B01J35/61C07C11/06Y02P20/52
Inventor 巩金龙蒋锋李水荣刘刚曾亮
Owner TIANJIN UNIV
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