Application of platinum catalyst in preparation of propylene by dimethylmethane

A platinum catalyst and a catalyst technology, applied in the field of Pt catalyst and its preparation, can solve the problems of easy deactivation selectivity, fast deactivation rate, carbon deposition of platinum-based catalysts, etc. The effect of propylene selectivity

Active Publication Date: 2016-04-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of serious carbon deposition, easy deactivation and low selectivity of existing platinum-based 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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  • Application of platinum catalyst in preparation of propylene by dimethylmethane
  • Application of platinum catalyst in preparation of propylene by dimethylmethane
  • Application of platinum catalyst in preparation of propylene by dimethylmethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (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;

[0030] (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;

[0031] (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;

[0032] (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;

[0033] (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.

[0034] Obtained TiO 2 -Al 2 ...

Embodiment 2

[0048] 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

[0050] 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.

[0051] 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 application of a platinum catalyst in preparation of propylene by dimethylmethane. The catalyst takes a TiO2-Al2O3 dual oxide as a carrier, a loaded active component is Pt, and the mass percentage composition of the Pt is 0.5-1.5 percent. The TiO2-Al2O3 dual oxide carrier is prepared by adopting a sol-gel method, and then the obtained carrier is steeped into a chloroplatinic acid solution, and is dried and calcined, thus obtaining the Pt / TiO2-Al2O3 catalyst. The catalyst is suitable for preparing the propylene by dimethylmethane dehydrogenation under a hydrogenation atmosphere; the addition of TiO2 changes the acting force of a product as well as a reactant with an active center, thus propylene selectivity and carbon deposition resistance are improved, and the catalyst is enabled to have better reaction stability under a high temperature condition.

Description

[0001] The application of the present invention is a divisional application of the parent application "a platinum catalyst loaded on a double oxide composite carrier and its preparation method and application". The application date of the parent application is July 14, 2014. The parent application The application number is 2014103338217. technical field [0002] 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 [0003] 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 butanooctano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J35/10C07C5/333C07C11/06
CPCY02P20/52B01J23/42B01J35/1004C07C5/3337C07C2523/42C07C11/06
Inventor 巩金龙蒋锋李水荣刘刚曾亮
Owner TIANJIN UNIV
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