Catalyst for preparing olefins with same carbon atom number by dehydrogenizing alkane mixtures of C4 and above, and preparation method and application thereof

Abstract

The invention discloses a catalyst for preparing olefins with the same carbon atom number by dehydrogenizing alkane mixtures of C4 and above, and a preparation method and application thereof. The catalyst comprises the following components: a) 0.01 to 5 percent of platinum, b) 0.05 to 5 percent of alkali metal, c) 1 to 20 percent of at least one of alkaline-earth metal and / or rare-earth metal, d)40 to 75 percent of at least one of molecular sieves with the diameters of more than 6A and regular channel structures, and e) an adhesive, wherein the weight ratio of the molecular sieve to the adhesive is 0.5:1-5:1. The catalyst is prepared by a method comprising the steps of impregnating, molding and roasting. In the catalyst, the porous molecular sieve with a regular channel structure is usedas a carrier, so that the selectivity of the catalyst is improved and the service life of the catalyst can be prolonged; and the catalyst is applied to the preparation of low-carbon olefins by dehydrogenizing petroleum saturated hydrocarbons, and can reduce energy consumption and save the cost.

Description

technical field [0001] The present invention relates to the field of petrochemical industry, and furthermore, relates to a catalyst, preparation method and application for dehydrogenating alkane mixture with carbon four or more to prepare olefins with the same carbon number. Background technique [0002] At present, the most common method of producing light olefins such as ethylene, propylene and butadiene from petroleum saturated hydrocarbons is steam cracking. About 99% of the world's ethylene and more than 50% of the propylene are produced by this method. Since the production of steam cracking method is currently operated under very harsh conditions, for example, the final temperature of the furnace tube in the radiant section of the cracking furnace reaches or exceeds 1125°C, and the residence time of materials in the furnace tube in the radiant section is shortened to 0.2s or even shorter. Under the current technical level, the possibility of improving the production o...

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Problems solved by technology

The active component of catalytic cracking catalyst is mainly Y molecular sieve with large pores, and the macromolecular hydrocarbons of the reaction raw materials are easy to diffuse into the pores for reaction, so its heavy oil conversion ability is strong; catalytic cracking catalysts generally use pores with strong shape selectivity Smaller ZSM-5 molecular sieves are used as active components, and it is more difficult for the macromolecular hydrocarbons of the reaction raw materials to diffuse into the pores, so its ability to convert heavy oil is weak

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