| The current large increase in urban solid waste is difficult to degrade naturally,leading to serious environmental pollution problems.Among them,the proportion of waste plastics is very important.Although the incineration treatment of waste plastics is simple,the pollution problems caused by it are more serious.The products obtained by general thermal cracking treatment have a wide distribution range and are difficult to purify.Therefore,an efficient Catalyst is designed and applied to catalytic thermal cracking of plastics.While increasing the yield of high-value fuel oil,it also alleviates the environmental pollution caused by waste plastics.This paper designs an experiment for the active center and carrier of the Catalyst in the plastic cracking process.(1)Use Vermiculite as a carrier and carry out a series of modifications to it,so that the interlayer environment of this carrier expands and provides an exposed environment for the active center in the body phase.Cobalt nitrate,nickel nitrate,mixed with 2,2-bipyridine and ethanol are used as intercalation solution to load cobalt and nickel ions on Vermiculite.The high selectivity of cobalt and nickel ions to low-carbon olefins in the cracking reaction makes the carbon number distribution more concentrated.In addition,the Acidity of the Catalyst has a great influence on the efficiency of the cracking reaction.The type of Acid is mainly divided into B Acid and L Acid.The Stronger B Acid can promote the aromatization reaction and isomerization reaction in the cracking process,thereby generating more hydrogen.Therefore,different L/B has a great influence on the distribution of pyrolysis products.Therefore,while obtaining the BET,XRD,SEM,and FT-IR characterization data of the Catalyst,combine the TPD and PY-IR,ICP-OES characterization data to analyze the structure and properties of the Catalyst.(2)According to the controlled variable method,first optimize various parameters(cracking temperature,nitrogen flow rate,feed quality)during the cracking process of waste plastics,and then apply these modified metal pillared Catalysts to In the experiment of catalytic thermal cracking of waste plastics.Determine the Percentage of pyrolysis product status(Gas,liquid,solid)by weighing method,determine the Percentage of Gas product and liquid product component by GC(peak area normalization method),and Perform TGA and DSC on the solid residue after the Catalyst cracking reaction analysis.(3)Montmorillonite was modified by acidification,sodium and organic.Cobalt,nickel and cobalt nickel bimetallic were inserted into the catalyst by impregnation method.The modified montmorillonite has a large specific surface area(compared with the modified vermiculite)and can provide more active sites.We can compare the similarities and differences between the two kinds of clay supported catalysts,and further explore the structure and properties of clay metal pillared catalysts.(4)Under the same experimental conditions,the modified metal pillared montmorillonite was used in the pyrolysis experiment of waste plastics.In addition,the inorganic cellulose film was applied to the pyrolysis experiment of plastics by impregnation method combined with vermiculite,montmorillonite and bentonite.The pyrolysis products were analyzed by GC,TGA and DSC.Combined with the characterization of the front surface of the catalyst,a reliable structure-activity relationship was constructed. |
