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Light alkane dehydrogenation catalyst and its preparation method and use

A dehydrogenation catalyst, a technology for low-carbon alkanes, applied in the direction of hydrocarbons, hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc. problems such as anchoring, to achieve the effect of high activity and stability

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the propane dehydrogenation reaction is carried out at high temperature (600°C), high temperature will cause the shedding of oxygen-containing species, which is not conducive to the anchoring of the metal, and it is easy to cause the catalyst performance to be unstable.

Method used

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  • Light alkane dehydrogenation catalyst and its preparation method and use
  • Light alkane dehydrogenation catalyst and its preparation method and use
  • Light alkane dehydrogenation catalyst and its preparation method and use

Examples

Experimental program
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preparation example Construction

[0016] The preparation method of the catalyst of the invention comprises the steps of calcining the nano-diamond at 1000-1400 DEG C in an inert gas, impregnating it with a platinum-containing compound solution, drying it in the air, and then reducing it.

[0017] In the above method, the calcining temperature of the nano-diamond in an inert gas is preferably 1000-1200°C. The inert gas is preferably nitrogen. The firing time is preferably 2-20 h, more preferably 2-8 h.

[0018] After the nano-diamond is baked in an inert gas, it is impregnated with a platinum-containing compound, and the platinum-containing compound is selected from platinum nitrate, chloroplatinic acid, potassium chloroplatinate, dichlorotetraammine platinum or platinum acetylacetonate. The liquid / solid ratio during immersion is preferably 50 to 70 mL / g, and the immersion temperature is preferably 15 to 45°C. The platinum content in the platinum-containing compound solution used for impregnation is preferabl...

example 1

[0026] Preparation of catalyst of the present invention and performance evaluation of propane dehydrogenation

[0027] (1) Preparation of catalyst

[0028] Take nano-diamond ND-30 with a particle size of 30nm, in N 2 Baked at 1000°C for 18 hours. Take 1.0g in N 2 The nano-diamonds after medium roasting were put into 8.6mL of chloroplatinic acid solution with a Pt content of 5.8mg / mL and 55.4mL of deionized water, treated with ultrasonic waves at 25°C for 3h, stirred for another 48h, and dried at 110°C for 24h; Reduction in a sodium formate solution with a concentration of 15mg / mL for 1 hour at 100°C, the molar ratio of sodium formate to Pt used was 15:1, and dried at 60°C for 18 hours to obtain catalyst A with a pore diameter of 11.7nm and a specific surface area of ​​340m 2 / g, the total pore volume is 0.796cm 3 / g (according to nitrogen absorption-desorption curve, adopt BET equation to obtain specific surface area, adopt BJH equation to obtain pore diameter and total por...

example 2

[0032] Catalyst is prepared by the method for example 1 and carries out propane dehydrogenation reaction, and difference is (1) in step with nanodiamond in N 2 The catalyst B was calcined at 1100°C. The contents of platinum and oxygen in the prepared catalyst B and the results of propane dehydrogenation reaction are shown in Table 1.

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Abstract

The invention discloses a light alkane dehydrogenation catalyst. The light alkane dehydrogenation catalyst comprises 0.1 to 7.0% by mass of Pt and 93 to 99.9% by mass of nano-diamond. The preparation method comprises roasting the nano-diamond in inert gas at 1000 to 1400 DEG C, immersing the nano-diamond in a platinum-containing compound solution, drying the nano-diamond in air and then reducing the nano-diamond. The catalyst is used for light alkane dehydrogenation and has high activity and stability.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst, a preparation method and an application, in particular, a catalyst with nano-diamond as a carrier, a preparation method and an application. Background technique [0002] Pt-based catalyst is one of the commonly used catalysts for propane dehydrogenation reaction. Propane dehydrogenation is a reversible reaction with strong endothermic and molecular number increase. High temperature and low pressure are conducive to the progress of the dehydrogenation reaction. The usual reaction temperature is about 600°C. Higher reaction temperature will lead to propane cracking and propane deep dehydrogenation. , so that the selectivity of propylene is reduced, and at the same time, it will also increase the carbon deposition on the surface of the catalyst and lead to the deactivation of the catalyst. by Al 2 o 3 The catalyst with Pt on the carrier is a dual-functional catalyst, with Pt centers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42C07C11/06C07C5/333
CPCY02P20/52
Inventor 刘杰荣峻峰马爱增达志坚刘昌呈谢婧新
Owner CHINA PETROLEUM & CHEM CORP
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