Preparation method of shell-core structure molecular sieve catalyst for biomass pyrolysis reforming upgrading

Abstract

The invention provides a preparation method of a shell-core structure molecular sieve for biomass pyrolysis oil production, which comprises the following steps of: adding deionized water into a beaker, measuring a TPAOH solution, adding the TPAOH solution into the deionized water, weighing HZSM-5 molecular sieve powder, adding the HZSM-5 molecular sieve powder into the solution, quickly stirring,sufficiently stirring for 1 hour, weighing a template agent CTAB, adding the template agent CTAB into a turbid liquid, sufficiently stirring, fully stirring the turbid liquid, transferring the turbidliquid into a high-pressure reaction kettle with a tetrafluoroethylene lining, placing the reaction kettle in a drying oven, digesting for 24 hours, taking out the reaction kettle, adjusting the pH value to 8.5, transferring the solution back into the high-pressure reaction kettle, crystallizing for 24 hours in the drying oven, filtering and washing the obtained solution containing the crystal grains, drying the filtered crystal grains in the drying oven, putting the dried molecular sieve into a muffle furnace, heating the muffle furnace to 550 DEG C at a heating rate of 10 DEG C / min, and roasting for 2-6 hours to remove the template agent, thereby obtaining the mesoporous-microporous composite molecular sieve with a core-shell structure.

Description

technical field [0001] The invention relates to a method for preparing a shell-core structure molecular sieve catalyst applied to biomass pyrolysis reforming and upgrading, which mainly utilizes the construction of mesoporous molecular sieves on the surface of microporous molecular sieves and realizes catalytic reforming by regulating the structure of mesoporous molecular sieves The invention relates to the selective pyrolysis of hydrocarbon organic matter, belonging to the technical field of biomass utilization. . Background technique [0002] Biomass energy, as a carrier of biomass, converts solar energy into chemical energy and stores it in biomass through photosynthesis, and has become the fourth largest energy source in the world after coal, oil, and natural gas. Biomass energy has the advantages of huge resources, clean and renewable, and has the potential to replace traditional fossil energy as the main energy source. [0003] Biomass rapid pyrolysis technology is t...

AI Technical Summary

Problems solved by technology

The commonly used microporous molecular sieve HZSM-5, its microporous structure can allow part of the pyrolysis steam to enter the interior for further pyrolysis, and the surface has a strong acidity that can promote the further decomposition of organic matter on its surface, but due to the strong acidity, the pyrolysis products Contains more long-chain organic matter and forms coke on its surface, and the catalyst is easily deactivated; the large pore size of mesoporous molecular sieve MCM-41 can meet the further pyrolysis of a wider range of substances and is not easy to coke, but due to the large pore size Re-pyrolysis may not be sufficient enough to escape the product, and the insufficient acidity of the surface leads to poor catalytic effect

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