Catalyst for directly preparing low carbon olefin through hydrogenation of carbon dioxide and preparation method thereof

Abstract

The invention relates to a layer structure catalyst for directly preparing ethylene, propylene and butene through hydrogenation of carbon dioxide. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide is prepared in the steps of mixing iron nitrate nonahydrate, potassium carbonate and titanium dioxide under a certain condition and then calcining an obtained mixture at a certain temperature for two times by using a high temperature solid state method so as to prepare the layer structure catalyst. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide has the advantages that a stable layer structure is obtained, the layer structure can be stably kept before and after the reaction of directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide, olefin secondary reaction caused by readsorption of primary olefin is inhibited to a certain degree, and high olefin selectivity is realized in the reaction of preparing low carbon olefin through hydrogenation of the carbon dioxide. Apreparation method is simple and environmentally friendly and has potential application values.

Description

technical field [0001] The present invention relates to CO 2 Catalyst for highly selective hydrogenation synthesis of ethylene, propylene, butene and preparation method thereof, specifically relates to a metal composite oxide catalyst with a stable layered structure for use in CO 2 Catalyst for hydrogenation of ethylene, propylene, butene and its preparation. Background technique [0002] CO 2 Hydrogenation to light olefins is the current CO 2 One of the potential ways to utilize this process can be through the CO 2 Fischer-Tropsch synthesis process (CO 2 –FTS) to selectively synthesize light olefins. This process activates and stabilizes CO 2 At the same time, it can realize its high added value utilization, which will be of great significance in scientific research and practical application. Since the product of the Fischer-Tropsch process is limited by the (Anderson-Schulz-Flory) ASF distribution, its product distribution is relatively wide, and the product alkane ...

AI Technical Summary

Problems solved by technology

[0003] Considering that Fe-based catalysts are cheap and easy to obtain, and have good catalytic activity, they are widely used in carbon dioxide hydrogenation reactions, but there are still problems such as wide product distribution and poor catalyst stability.

In a typical Fischer-Tropsch synthesis reaction, primary olefins are easily re-adsorbed on the catalyst surface to trigger a secondary hydrogenation reaction, resulting in a decrease in the selectivity of olefins, which is one of the main factors affecting the high selectivity of by-products in this process.

At present, there are still key technical problems in inhibiting the secondary reaction activity of primary olefins, improving the olefin selectivity of catalysts, reducing CO selectivity, and regulating product distribution.

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