Small crystal grain zirconium-containing ZSM-5 molecular sieve catalyst and preparation method thereof

Abstract

The invention relates to molecular sieve catalyst ZSM-5 that is small crystal particle and contains zirconium. The percentage weight portion of the catalyst is: SiO2: Al2 O3:NaO2:zirconium is equal to 70-95:1-4 : 1-2 : 0.05-3; the average grain size is 0.2 -0.5Mum, and total acid content is 0.8-1.1 millinormal / gram. During gasoline production by synthesis gas through methanol or dimethyl ether, the conversion rate of methanol or dimethyl is up to 100 percent; selectivity of gasoline fraction (C5<+>) is high; olefin content in finished oil product is less than 10 percent, which is environment friendly; the catalyst has good carbon collection resistance performance; single-pass service life can reach above 1000 hours.

Description

technical field [0001] The invention belongs to a molecular sieve catalyst and a preparation method thereof, in particular to a small grain zirconium-containing ZSM-5 molecular sieve catalyst and a preparation method thereof. Background technique [0002] my country is a country with a serious shortage of oil resources. The country's proven oil reserves only account for 1.4% of the world. In recent years, with the sustained and rapid development of my country's national economy, energy demand has continued to increase. At present, the dependence on oil imports is increasing. However, my country's proven coal reserves, production and consumption account for 12.6%, 35.3% and 34.4% of the world's total respectively, which determines that my country's energy consumption must be based on coal resources and vigorously develop coal energy characterized by clean coal transformation chemical technology. [0003] Coal-based synthesis gas / methanol and further conversion to energy and c...

AI Technical Summary

Problems solved by technology

During our extensive research, we found that when synthesizing ZSM-5 molecular sieves in a hydrothermal system, if an organic amine is used alone as a template, there will be problems such as long crystallization cycle of molecular sieve synthesis and high cost of catalyst preparation, especially in the synthesis of ZSM-5 molecular sieves. Heteroatom ZSM-5 molecular sieve with small grain size requires some specific synthesis conditions and raw materials, such as low temperature, high-speed stirring and adding salt, etc.

Chinese patent 03124261.8 synthesized zirconium-containing ZSM-5 molecular sieves under ordinary hydrothermal synthesis conditions, but the molecular sieves have large grain diameters, generally with an average particle size greater than 1 μm, and poor carbon deposition resistance

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