Method for preparing nano-FeZSM-5 molecular sieve, catalyst prepared from nano-FeZSM-5 molecular sieve and application thereof

Abstract

The invention discloses a method for preparing a nano-FeZSM-5 molecular sieve and application of the nano-FeZSM-5 molecular sieve in a dimethyl ether-to-gasoline (DTG) reacting process. According to the preparation method, the molecular sieve preparation process is simple, the structure directing agent in filtrate can be recycled, less waste liquid is generated, stirring is not required, and the equipment is simple; and the synthesized molecular sieve has high yield, and the prepared molecular sieve has small grain, uniform size, easy regulation and high crystallization degree; and the catalyst prepared from the nano-FeZSM-5 molecular sieve has excellent catalytic activity for DTG reaction, the dimethyl ether conversion rate is 100 percent, the single-pass oil product has high yield (morethan 35 percent), aromatic hydrocarbon in a gasoline product has low content (less than 40 percent), the content of the durene is lower than 2 percent, and the problems of low single-pass yield of oilproducts and high content of aromatic hydrocarbon, especially durene in an oil product in DTG technology can be solved.

Description

technical field [0001] The present invention relates to a preparation method and application of a nano FeZSM-5 molecular sieve, specifically a method for preparing a nano FeZSM-5 molecular sieve through a dry glue liquid phase inversion method and its reaction in dimethyl ether to gasoline (DTG) application in the process. Background technique [0002] With the rapid development of the transportation industry and the arrival of the world's post-oil era, the global demand for liquid fuels continues to grow. Countries have committed themselves to developing non-petroleum routes to produce liquid fuels to meet their strong demand. Gas-to-liquid (GtL), that is, the gasification of coal, natural gas, carbonaceous biomass, etc. to produce gasoline and diesel through synthesis gas, is an important technical approach for the production of liquid fuels by non-petroleum routes. Among various gas-to-oil routes, methanol / dimethyl ether-to-gasoline (M / DTG) technology from syngas is beco...

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Problems solved by technology

But this method also has some shortcomings, the biggest problem is how to make a special crystallization kettle so that the dry rubber fine powder can be placed on the top of the structure directing agent aqueous solution, and let the structure directing agent and water vapor Through the dry rubber fine powder, the dry rubber fine powder is crystallized and converted into molecular sieves, and the crystallization kettle needs to be divided into upper and lower parts during the preparation of molecular sieves, so that the effective space utilization rate of the reactor is significantly reduced. This special requirement It will bring certain difficulties to industrial production and reactor design

[0007] It can be seen that the above-mentioned disclosed metal-modified ZSM-5 molecular sieve catalyst has defects such as complicated preparation process, environmental pollution, high synthesis cost, difficult reactor design, and high content of aromatics in the oil when it is applied to the reaction of dimethyl ether to gasoline.

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