A kind of molecular sieve catalyst and preparation method thereof

Abstract

The invention discloses a molecular sieve catalyst and a preparation method thereof, and the method comprises the following steps: (1) spraying water onto a molecular sieve carrier to atomize and pre wet the molecular sieve carrier; and (2) leaching the atomized and pre wetted molecular sieve carrier with a an aqueous solution containing an active component to load the active component onto the molecular sieve carrier. The molecular sieve catalyst with molecular sieve content up to 95 wt% is prepared successfully, the particle diameter of the molecular sieve catalyst is 0.3 mm to 2 mm, the specific surface area is 580-640 square meters per gram, pore volume is 0.35-0.4 ml / g, and the most probable aperture is 8-12 nanometers; and the prepared molecular sieve catalyst has high strength (30-50N / grain or 20N / mm) and high yield (97-98%), the preparation method is simple, drying sieving and once-more pre wetting are not needed, the process is more simple, broken ratio of the molecular sieve catalyst is reduced, and the yield is increased.

Description

technical field [0001] The invention relates to a molecular sieve catalyst and a preparation method thereof. Background technique [0002] Heterogeneous solid catalyst is currently the catalyst with the highest proportion used in petrochemical and other industries. It is composed of active components and carriers; among them, the carrier is the dispersant, binder or support of the active components, and is the skeleton of the active components. There are many types, commonly used are alumina, molecular sieve, silica gel, activated carbon, diatomaceous earth, activated clay, etc.; active components (aqueous solutions containing active components) are loaded on the carrier by impregnation, deposition, precipitation or ion exchange. . During the loading process of active components, heat is released, and the amount of heat released is related to the type of carrier. If the heat release is significant and the heat cannot be taken away in time, it will cause the catalyst to be ...

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Problems solved by technology

However, this method has relatively obvious defects: 1. In order to reduce the carrier breakage rate, the carrier and water do not need to be stirred during the pre-humidity heat exchange, which will easily lead to local high temperature, and the catalyst carrier breakage rate has reached 8-10%; 2. The product High water consumption, fresh water consumption per ton of carrier pre-wetting is more than 10 tons, and circulating water consumption is more than 80 tons; ③The circulating water must be cooled before use, and the energy consumption of the whole process is high; and ④The carrier is pre-wetted before loading activity Components, the whole process is longer and the yield is lower

However, this method is widely used in industrial production, but the carrier molecular sieve content is only 60% by weight, and the temperature rises significantly during the impregnation process, and the temperature is as high as above 40°C; in addition, the catalyst breakage rate is 10-15%.

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