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

AI Technical Summary

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

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

Examples

Experimental program
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Effect test

Example Embodiment

[0027] Example 1

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

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

[0030] (3) Leave the resulting gel to stand and age for 24 hours, then remove the solvent, dry at 70°C for 20 hours, and fire 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℃ for 12h and baking at 600℃ for 3h, the result is PtO 2 / TiO 2 -Al 2 O 3 Catalyst; finally at H 2 Reduce 1h in the atmosphere to obtain Pt / TiO 2 -Al 2 O 3 catalyst.

[0033] TiO obtained 2 -Al 2 O 3 The XRD spectrum...

Example Embodiment

[0046] Example 2:

[0047] The reaction was carried out using the method of Example 1. The only difference is that the amount of aluminum sec-butoxide (ATSB) in step (1) is 9.2g, the amount of butyl titanate (TTB) is 0.43g, and the resulting catalyst contains TiO 2 The mass percentage is 5%. TiO obtained 2 -Al 2 O 3 The XRD spectrum of the vector is as follows figure 1 As shown, the Pt / TiO obtained after reduction 2 -Al 2 O 3 The XRD spectrum of the catalyst is as follows figure 2 Shown.

Example Embodiment

[0048] Example 3:

[0049] The reaction was carried out using the method of Example 1. The only difference is that the amount of aluminum sec-butoxide (ATSB) in step (1) is 7.7g, the amount of butyl titanate (TTB) is 1.72g, and the resulting catalyst contains TiO 2 The mass percentage is 20%. TiO obtained 2 -Al 2 O 3 The XRD spectrum of the vector is as follows figure 1 As shown, the Pt / TiO obtained after reduction 2 -Al 2 O 3 The XRD spectrum of the catalyst is as follows figure 2 Shown.

[0050] From figure 1 It can be seen that the composition of the obtained carrier is TiO 2 And Al 2 O 3 , Verified as a double oxide composite carrier; when TiO 2 When the percentage is 5%, there is no TiO 2 Peaks appear when TiO 2 TiO appears when the mass percentage reaches 10% 2 Diffraction peak and its peak intensity varies with TiO 2 The mass percentage of Al 2 O 3 The peak intensity of TiO 2 Distributed in Al 2 O 3 Surface, and highly dispersed.

[0051] by figure 2 It can be seen that the ...

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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
CPCY02P20/52
Inventor 巩金龙蒋锋李水荣刘刚曾亮
Owner TIANJIN UNIV
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