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Activating method for dehydrogenation catalyst of low concentration hydrogen reduction combined with temperature-programmed reduction

A dehydrogenation catalyst and temperature-programmed technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as small surface area of ​​elemental Pt, large catalyst metal particles, and sintering of metal particles

Active Publication Date: 2015-04-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is easy to cause the sintering of metal particles, so that the reduced metal particles of the catalyst are too large, resulting in a small surface area of ​​exposed elemental Pt, which ultimately makes the activity and selectivity of the catalyst low.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0014] The dehydrogenation catalyst can be prepared by a conventional method, such as using an impregnation method to support the dehydrogenation active metal, and the auxiliary agent can be introduced during the preparation of the alumina carrier and / or by an impregnation method.

[0015] The catalyst of the present invention takes Sn-containing alumina or weakly acidic molecular sieve as a carrier, and the dehydrogenation active metal component is generally selected from one or more of platinum, palladium, iridium, rhodium or osmium in the platinum group, preferably platinum, The dosage is 0.01%~2% of the weight of the carrier in terms of elements. The content of Sn is 0.1%~10% of the weight of the carrier in terms of elements.

[0016] In the dehydrogenation catalyst with Sn-containing alumina or weak acid as the carrier of the present invention, Sn is introduced into the Sn-containing material when the alumina is gelled, and then made into a carrier.

[0017] In the dehyd...

example 1

[0033] Preparation of Sn-containing alumina support. After mixing a certain amount of 0.98M aluminum trichloride solution and 0.01M tin tetrachloride solution, add a certain amount of 8% ammonia water, mix evenly in a neutralization tank at 60~80°C, and control the pH value from 7.0~ 9.0, after filtering, washing with water and acidifying, pressurize into spheres in an oily ammonia column, dry, age, and roast at 650~750°C for 4 hours to obtain alumina pellets containing 0.8wt% Sn.

[0034] The alumina pellet carrier containing 0.8% Sn was calcined at 800°C for 3h, the calcined carrier was immersed in an aqueous solution containing chloroplatinic acid for 6h at 70°C, dried at 120°C for 2h, and calcined at 500°C for 4h. Then activate in air containing water vapor for 4h. Then at 70 °C with KNO 3 Soaked in aqueous solution for 2h, dried and roasted under the same conditions. The loading of each component in the catalyst is: Pt 0.3wt%, Sn 0.8wt%, K 0.7wt%.

[0035] Activation...

example 2

[0045] Preparation of Sn-containing alumina support. After mixing a certain amount of 1.08M aluminum trichloride solution and 0.01M tin tetrachloride solution, add a certain amount of 10% ammonia water, mix evenly in a neutralization tank at 60~80°C, and control the pH value of 7.0~ 9.0, after filtering, washing with water and acidifying, pressurize into spheres in an oil ammonia column, dry, age, and roast at 650~750°C for 4 hours to obtain alumina pellets containing 1.0wt% Sn.

[0046] The alumina pellet carrier containing 1.0% Sn was calcined at 800 °C for 3 h, the calcined carrier was immersed in an aqueous solution containing chloroplatinic acid for 4 h at 70 °C, dried at 120 °C for 2 h, calcined at 500 °C for 4 h, and Activation in air containing water vapor for 4h. Then at 70 °C with KNO 3 Soaked in aqueous solution for 2h, dried and roasted under the same conditions. The loading of each component in the catalyst is: Pt 0.7wt%, Sn 1.0wt%, K 1.0wt%.

[0047] Activat...

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Abstract

The invention discloses an activating method for a dehydrogenation catalyst of low concentration hydrogen reduction combined with temperature-programmed reduction. The dehydrogenation catalyst is a platinum group metal-supported catalyst. The activation process of the dehydrogenation catalyst comprises the steps of firstly performing the high temperature reduction and then the temperature-programmed reduction, wherein the high temperature reduction employs a nitrogen-hydrogen mixed gas as a reducing gas, with the volume content of hydrogen being 1%-8%, and reduces for 0.5-8.0 h at a temperature of 450-550 DEG C; and the temperature-programmed reduction employs hydrogen as a reducing gas, wherein the initial temperature of the temperature-programmed reduction is 240-400 DEG C, the end temperature of the temperature-programmed reduction is 450-600 DEG C, and heating temperature speed is 0.5-10 DEG / min; then adjusting the temperature to 500-650 DEG C; omitting sulfuration passivation; and directly passing through a raw material gas containing hydrogen to perform dehydrogenation reaction. Compared with a dehydrogenation catalyst reduced and activated by a conventional method, the dehydrogenation catalyst reduced and activated by the method has higher activity and stability.

Description

technical field [0001] The present invention relates to the activation method of a kind of low-carbon alkane catalytic dehydrogenation olefin catalyst, specifically, is about C 2 ~C 5 Method for activating catalysts for dehydrogenation to olefins. Background technique [0002] With the popularization and use of civil natural gas, the effective utilization of liquefied gas in refineries has become a hot spot in the field of petrochemical industry. How to finely utilize the precious low-carbon alkane resources in liquefied gas is of great significance. The dehydrogenation of propane to propylene and the dehydrogenation of isobutane to isobutene are one of the important ways to produce chemical raw materials from liquefied gas, and it will become a focus of research and development of petrochemical technology in the new century. [0003] The catalytic dehydrogenation reaction of light alkanes is limited by thermodynamic equilibrium and must be carried out under harsh conditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/18B01J23/62C07C11/06C07C5/333
CPCY02P20/52
Inventor 张海娟李江红张喜文宋喜军孙潇磊王振宇
Owner CHINA PETROLEUM & CHEM CORP
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