A catalyst modification method for improving the yield of biomass catalytic pyrolysis hydrocarbons

Abstract

The invention discloses a catalyst modification method for increasing the yield of biomass catalytic pyrolysis hydrocarbons, which belongs to the field of biomass resource conversion and utilization, and comprises the following steps: step 1, forming powdered HZSM‑5 molecular sieves into tablets , then crush and sieve the particles; Step 2, place the HZSM‑5 shaped particles in a carrier gas atmosphere containing water vapor, and perform constant temperature treatment; Step 3, place the HZSM‑5 shaped particles after water vapor treatment in the air Calcining at constant temperature and cooling to obtain the modified HZSM‑5 catalyst. By adopting the technical scheme provided by the present invention, the skeleton structure and acidity of the HZSM-5 catalyst can be adjusted, and its catalytic performance in the catalytic conversion reaction of biomass pyrolysis steam can be improved. Compared with the unmodified HZSM-5 catalyst, it can effectively improve the The target product yield of hydrocarbons in catalytic pyrolysis of biomass was determined.

Description

technical field [0001] The invention belongs to the field of conversion and utilization of biomass resources, and in particular relates to a catalyst modification method for improving the yield of biomass catalytic pyrolysis hydrocarbons. Background technique [0002] Aromatics and olefins are key basic raw materials in chemical production, and they are currently mainly derived from fossil energy such as petroleum. Fossil energy reserves are limited and non-renewable. At the same time, the consumption of fossil energy will lead to an increasingly serious problem of greenhouse gas emissions. At present, countries around the world are advocating that the energy structure should be diversified, clean, and low-carbon. The development of renewable clean energy has become a current research hotspot. . Biomass is the only renewable organic carbon source in nature, which can be used to replace traditional fossil energy to produce high-quality fuels and chemicals. Biomass is not on...

AI Technical Summary

Problems solved by technology

In the steam products of biomass catalytic pyrolysis, the molecular sizes of the components are different. The light components with a molecular size smaller than the pore diameter of the catalyst are easy to enter the catalyst pores and be converted into hydrocarbon target products, while the heavy components with a molecular size larger than the pore diameter of the catalyst It is difficult for components to enter the pores of the catalyst, and it is easy to form carbon deposits under the acidic action of the outer surface of the catalyst to block the pores, resulting in deactivation of the catalyst. In addition, some active small molecular light components are also easily consumed under the acidic action of the outer surface of the catalyst, reducing the Hydrocarbon Target Product Yield

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