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Dichromium trioxide catalyst for catalyzing ethane to prepare ethylene and preparation thereof

A technology of chromium trioxide and catalyst, applied in the field of chromium trioxide catalyst and preparation thereof, can solve the problems of low conversion rate and selectivity and high reaction temperature, achieve good catalytic activity, low reaction temperature, and simplify product post-processing The effect of craftsmanship

Active Publication Date: 2017-09-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, chromium-based catalysts also have the disadvantages of high reaction temperature, low conversion rate and low selectivity.

Method used

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  • Dichromium trioxide catalyst for catalyzing ethane to prepare ethylene and preparation thereof
  • Dichromium trioxide catalyst for catalyzing ethane to prepare ethylene and preparation thereof
  • Dichromium trioxide catalyst for catalyzing ethane to prepare ethylene and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Mix 0.1mol / L urea aqueous solution and 0.038mol / L chromium nitrate aqueous solution at a volume ratio of 1.5:1, stir, and react at 95°C for 6h. The reaction product was then aged at 25 °C for 12 h. The aged product was filtered, washed with distilled water until the filtrate was neutral. Suction filter the filter residue until it is anhydrous, and obtain a wet gel. Soak the wet gel in absolute ethanol for 12 hours, and then filter; continue to treat the treated wet gel with ethanol once more to obtain an alcohol gel. The alcohol gel was air dried. Then the alcohol gel was immersed in 10wt% TEOS / ethanol solution and reacted at 25°C for 12h. The reaction product was filtered and washed three times with ethanol. The obtained solid product was dried at 80°C, then calcined at 600°C, pressed into tablets, pulverized and sieved to form 40-mesh granules to obtain a chromium trioxide catalyst.

Embodiment 2

[0051] Mix 0.09mol / L urea aqueous solution and 0.075mol / L chromium nitrate aqueous solution at a volume ratio of 2:1, stir, and react at 90°C for 6h. The reaction product was then aged at 25 °C for 12 h. The aged product was filtered, washed with distilled water until the filtrate was neutral. Drain the filter residue as much as possible to obtain a wet gel. Soak the wet gel in absolute ethanol for 12 hours, and then filter; continue to treat the treated wet gel with ethanol twice to obtain an alcohol gel. The alcohol gel was air dried. Then the alcohol gel was immersed in 1wt% TEOS / ethanol solution and reacted at 50°C for 12h. The reaction product was filtered and washed three times with ethanol. The obtained solid product was dried at 80°C, then calcined at 600°C, pressed into tablets, crushed and sieved to form 20-mesh granules to obtain a chromium trioxide catalyst.

Embodiment 3

[0053] Mix 0.12mol / L urea aqueous solution and 0.05mol / L chromium nitrate aqueous solution at a volume ratio of 1:1, stir, and react at 95°C for 6h. The reaction product was then aged overnight at room temperature. The aged product was filtered, washed with distilled water until the filtrate was neutral. Suction filter the filter residue until it is anhydrous, and obtain a wet gel. The wet gel was soaked in absolute ethanol overnight, and then filtered; the treated wet gel was continued to be treated with ethanol once more to obtain an alcohol gel. The alcohol gel was air dried. Then the alcohol gel was immersed in 3wt% TEOS / ethanol solution and reacted overnight at room temperature. The reaction product was filtered and washed three times with ethanol. The obtained solid product was dried at 80° C., then calcined at 600° C., pressed into tablets, pulverized and sieved to form 30-mesh granules to obtain a chromium trioxide catalyst.

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Abstract

The invention relates to a dichromium trioxide catalyst for catalyzing ethane to prepare ethylene. The dichromium trioxide catalyst comprises porous dichromium trioxide, pores and the external surface of the porous dichromium trioxide are grafted by Si-O-like groups. The invention also relates to a preparation method of the dichromium trioxide catalyst for catalyzing ethane to prepare ethylene and relates to application of the dichromium trioxide catalyst to preparation of ethylene through dehydrogenation of ethane oxidized by carbon dioxide. According to the catalyst provided by the invention, high ethane conversion rate and high ethylene selectivity can be achieved when the catalyst is applied to reaction of catalyzing dehydrogenization of ethane to prepare ethylene.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a chromium trioxide catalyst for catalyzing the production of ethylene from ethane, a preparation method and application thereof. Background technique [0002] Ethane widely exists in petroleum gas, natural gas, coke oven gas and petroleum cracking gas. If it is used rationally, such as dehydrogenation to produce ethylene, it will produce significant economic and social benefits. The traditional process uses steam to crack ethane to produce ethylene, but the cracking temperature of this process is high, usually between 850-900 ° C, and requires a large amount of water vapor, which consumes a lot of energy. Moreover, a large amount of coke, acetylene and C will be produced in the above cracking process 3 components. [0003] The preparation of ethylene from ethane by catalytic dehydrogenation or catalytic oxidative dehydrogenation requires low reaction temperature, which has aroused th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J35/10C07C5/42C07C11/04
CPCC07C5/42B01J23/26B01J35/613B01J35/615C07C11/04Y02P20/52
Inventor 邵芸张明森武洁花赵清锐柯丽
Owner CHINA PETROLEUM & CHEM CORP
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