Nano dichromium dioxide catalyst for preparing ethylene by using carbon dioxide to oxidate ethane and dehydrogenation

A technology of chromium trioxide and ethylene oxide, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, chromium trioxide, physical/chemical process catalyst, etc., can solve the problem of insignificant decrease in reaction temperature, and achieve Narrow particle size distribution, high purity, and easy industrialization

Inactive Publication Date: 2004-07-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Krylov et al. (1. Krylov OV, Mamedov A K, Mirzabekova S R. Catal. Today, 1995, 24: 371-375; 2. Xu L, Liu J, Yang H, Xu Y, Wang Q, Lin L. Catal. , 1999, 62: 185-189) found that the composite oxide-supported catalyst containing manganese oxide had a high conversion rate of ethane at a high temperature of 800-830 °C, but compared with the traditional high-temperature steam cracking of ethane to produce ethylene Compared with the process, the reduction of reaction temperature is not significant

Method used

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  • Nano dichromium dioxide catalyst for preparing ethylene by using carbon dioxide to oxidate ethane and dehydrogenation
  • Nano dichromium dioxide catalyst for preparing ethylene by using carbon dioxide to oxidate ethane and dehydrogenation

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Embodiment

[0018] (1)Cr(NO 3 ) 3 Solution and configuration of dilute ammonia solution

[0019] Weigh 16g Cr(NO 3 ) 3 .9H 2 O was dissolved in 200ml distilled water to form Cr(NO 3 ) 3 solution. Then ammonia water and distilled water are mixed to form a dilute ammonia solution with a concentration of 2.5 wt%.

[0020] (2) Preparation of surfactant solution

[0021] Take 5ml of oleic acid and Tween-80 and dissolve them in 200ml of prepared dilute ammonia solution; stir to obtain a translucent surfactant solution, wherein the concentration of ammonia is 1wt%.

[0022] (3) Preparation of nano slurry

[0023] In the state of constant stirring, the Cr(NO 3 ) 3 solution and dilute ammonia solution flow into the surfactant solution of step (2) at a temperature of 40°C, wherein Cr(NO 3 ) 3 The volume ratio of solution and surfactant solution is 1: 1; By regulating the flow velocity of the dilute ammonia solution of step (1), regulate the hydrated Cr that constantly obtains 2 o 3 T...

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Abstract

The present invention belongs to the fixed of catalyst for preparing ethylene, in particular, it relates to a nano chromium oxide catalyst for preparing ethylene by using carbon dioxide to oxidate ethane anjd dehydrogenation. The production process of the catalyst includes the following steps: mixing Cr(NO3)3 solution and dilute ammonia water solution, adding them into surfactant solution, making the pH value of the hydrated Cr2O3 nano slurry be retained at 9-11, separating to obtain hydrated Cr2O3 gel whose surface is covered with surfactant, coboiling the obtained hydrated Cr2O3 gel and normal butanol according to volume ratio of 1:6-8, distilling and separating to obtain alcoholic gel, drying and roasting to obtain nano Cr2O3 powder, tableting, grinding and sieving to 20-40 meshes so as to obtain the invented catalyst.

Description

technical field [0001] The invention belongs to the field of catalysts for preparing ethylene, in particular to a nano-chromium trioxide catalyst for oxidizing ethane and dehydrogenating ethylene to prepare ethylene. Background technique [0002] There are a large number of low-carbon alkanes in natural gas, petroleum liquefied gas and refinery gas, and their conversion into chemical raw materials such as olefins and oxygen-containing organic compounds has broad application prospects. The traditional high-temperature (~950°C) steam cracking of ethane to ethylene requires high energy consumption and complex product composition. CO 2 The oxidative dehydrogenation of ethane to ethylene is a new oxidative dehydrogenation reaction process of ethane. Compared with the traditional industrial production process of ethane high-temperature steam cracking to ethylene, this catalytic process has unique advantages, such as: the reaction temperature is relatively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J35/02C01G37/033C07C5/03C07C11/04
CPCY02P20/52
Inventor 邓双李会泉张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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