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

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 ...

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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

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