Catalyst for preparing corresponding olefins through dehydrogenation of low-carbon alkanes and application of catalyst

Abstract

The invention discloses a catalyst for preparing corresponding olefins through dehydrogenation of low-carbon alkanes and application of the catalyst, and relates to low-carbon alkanes. The chemical composition of the catalyst comprises a precious metal element, a modification element and a carrier, wherein the mass percentage content of the precious metal is 0.3-20%, the mass percentage content ofthe modification element is 0.1-50%, and the balance is the carrier. The application of the catalyst for preparing the corresponding olefins through dehydrogenation of the low-carbon alkanes in direct olefin production comprises the specific steps that the catalyst is heated from room temperature to a reaction temperature of 450-800 DEG C at a heating rate not higher than 20 DEG C min<-1> under inert gas purging, and the heating treatment time is 10-120 min; and after the catalyst is pretreated, low-carbon alkane gas or low-carbon alkane mixed gas diluted by inert gas is introduced, the reaction gas composition comprises the following components in percentage by volume: 20-70% of low-carbon alkanes and the balance of inert gas, and the reaction gas enters a reactor and flows through a solid catalyst bed layer to be subjected to dehydrogenation reaction to generate the corresponding olefin product.

Description

technical field [0001] The present invention relates to lower carbon alkane (C 2 -C 4 ), especially involving lower alkanes (C 2 -C 4 ) as a raw material, a kind of low-carbon alkane dehydrogenation under the low-carbon alkane or inert gas diluted low-carbon alkane atmosphere to prepare the corresponding olefin catalyst and its application. Background technique [0002] Low-carbon olefins are extremely important chemical basic raw materials. As the first industrial triene, ethylene is widely used in the production of chemical products such as polyethylene, polyvinyl chloride, acetaldehyde, ethanol and its esters, oxalic acid and related polymers. Propylene is mainly used to produce important chemical products such as polypropylene, acrylic acid and its esters, acrylonitrile, propylene oxide, epichlorohydrin, isopropanol, phenol, and acetone. Carbon tetraolefins, especially butadiene, are widely used in the production of synthetic rubber, synthetic plastics and other che...

AI Technical Summary

Problems solved by technology

The high temperature in the regeneration process often causes sintering and loss of metals, which eventually leads to irreversible deactivation of the catalyst

The researchers found that the introduction of hydrogen into the reaction atmosphere can inhibit the carbon deposition in the reaction process to a certain extent. However, the introduction of hydrogen not only greatly reduces the single-pass conversion rate, but also increases the unit consumption, resulting in increased costs.

How to maintain high alkane conversion and catalyst stability at high temperature is still very challenging

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