ZSM-5 molecular sieve based catalyst used for preparing ethylene through ethanol dehydration and preparation method thereof

Abstract

The invention belongs to the technical field of catalyst used in preparation of ethylene through ethanol dehydration and provides a catalyst and a preparation method thereof. The catalyst is high in ethylene selectivity, high in heat stability and not prone to carbon deposition in the catalyst process. The technical scheme is that the ZSM-5 molecular sieve based catalyst used for preparing ethylene through ethanol dehydration comprises the following components: a. a ZSM-5 molecular sieve with silicon / aluminum molar ratio as 25 and occupying 40% to 80% of the weight of the catalyst, and b. an adhesive occupying 20% to 50% of the weight of the catalyst. The adhesive is at least one of pseudo-boehmite, aluminum sol and silica sol. The catalyst prepared by the method has the advantages of being high in ethylene selectivity and heat stability if used in preparation of ethylene through ethanol dehydration.

Description

technical field [0001] The invention belongs to the technical field of ethanol dehydration catalysts for preparing ethylene. Background technique [0002] Ethylene is one of the most important organic chemical raw materials, and more than 70% of chemical products are produced directly or indirectly from ethylene. In the entire production process of the petrochemical industry, ethylene plays an important role as an "intermediate" from petroleum products to chemical products. Therefore, the ethylene industry occupies an extremely important position in the entire petrochemical industry and is called the cornerstone of the petrochemical industry. "Tap". The development level of a country's ethylene industry is often regarded as an important symbol to measure the development level of a country's petrochemical industry, and it is also a manifestation of a country's comprehensive economic strength. In the past 30 years, the world's ethylene production has grown rapidly. From 1997...

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Problems solved by technology

The catalyst requires a higher reaction temperature of 450°C and an 80% lower ethylene yield

At present, the catalysts in the process of ethanol dehydration to ethylene have the problems of low ethylene selectivity, poor thermal stability of the catalyst, and low catalyst strength.

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