Abstract
To investigate the catalytic pyrolysis performance of complex metal oxide catalysts for biomass, γ-Al2O3 was prepared through the precipitation method, and then ZrO2 and γ-Al2O3 were blended in the proportion of 2:8 using the co-precipitation method. Next, CeO2 was loaded on the surface of the catalyst for further modification. The three catalysts, A, ZA and CZA, were obtained. The specific surface and acidity of the catalysts were characterized by nitrogen adsorption–desorption and NH3-Temperature Programmed Desorption (NH3-TPD) respectively. The catalytic pyrolysis performance of catalysts for bamboo residues was investigated by Pyrolysis gas chromatography mass spectrometry (Py-GC/MS). Chromatograms were analyzed for identification of the pyrolysis products and the relative amounts of each component were calculated. Experimental results indicated that catalyst A had a good catalytic activity for the fast pyrolysis of bamboo residues. The addition of ZrO2 and CeO2 could continuously enhance the acidity of the catalyst and further promote the pyrolysis of macromolecular compounds and deoxidation of oxygen-containing compounds. Finally, catalyst CZA, obtained by compound modification, could not only dramatically reduce the relative content of phenol, acid and aldehyde and other oxygen-containing compounds, but also achieved the maximum hydrocarbon yield of 23.38%. The catalytic performance of catalyst CZA improved significantly compared with catalyst A.
Highlights
Catalytic fast pyrolysis of biomass is one of the most effective ways to convert biomass into high grade bio-oil, and it is essential to select excellent catalysts [1,2,3,4]
It is widely accepted that mesoporous materials have been the most promising catalysts for the catalytic pyrolysis of biomass [11,12]
It could be observed that with the participation of catalysts, components such as phenols and benzofuran with higher relative contents in the non-catalytic pyrolysis products reduced to different degrees
Summary
Catalytic fast pyrolysis of biomass is one of the most effective ways to convert biomass into high grade bio-oil, and it is essential to select excellent catalysts [1,2,3,4]. The most efficient zeolite is HZSM-5 due to its shape selectivity and aromatization for aromatic petrochemical hydrocarbons [5,6,7] It can significantly increase the hydrocarbon content in bio-oil and has excellent catalytic properties, the microporous structure and strong surface acidity of HZM-5 make it difficult for large-scale oxygenates to enter the pores. Mochizuki conducted an experimental study using SiO2 as a catalyst with a higher specific surface area [9] He found that the SiO2 catalyst could significantly reduce the content of oxygenated compounds in bio-oil and improved hydrocarbon yield to 14.3%. The combination of ZrO2 and γ-Al2 O3 as composite catalysts has a large specific surface area, good thermal stability and suitable pore size distribution from γ-Al2 O3 , it can fully exert the advantages of ZrO2 , which is beneficial to the dispersion of active components and the improvement of catalytic activity. In order to further increase the catalytic activity of the ZrO2 and γ-Al2 O3 catalyst, its surface was loaded with CeO2 as an active component to improve the performance of the catalyst
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