Catalytic performance of scrap tyre char for the upgrading of eucalyptus pyrolysis derived bio-oil via cracking and deoxygenation

Publication date: Available online 11 February 2019Source: Journal of Analytical and Applied PyrolysisAuthor(s): Qiaoqiao Zhou, Alireza Zarei, Anthony De Girolamo, Yuxin Yan, Lian ZhangAbstractCatalytic pyrolysis of biomass is one of the potential routes to convert lignocellulose material to high-value bio-fuels. In this paper, we explored the use of Zn-rich scrap tyre char, a low-value byproduct from the pyrolysis of waste scrap tyre as a catalyst for in-situ upgrading of crude bio-oil derived from the pyrolysis of eucalyptus. Experiments were performed in a two-stage fixed-bed reactor at 500 °C with a catalyst loading of 0 ˜ 80 wt% on the mass basis of biomass. The characteristics of catalyst and bio-oils were conducted extensively by different facilities, including Karl Fischer titration, XRF, CHNS, FTIR, solvent extraction, and synchrotron C K-edge XANES. A removal of 40.3% oxygen in the form of H2O, CO2 and CO was confirmed upon the loading of 80 wt% scrap tyre char. Simultaneously, the bio-oil yield decreased from 33.4 wt% to 21.1 wt%. The acid-soluble inorganic species in scrap tyre char preferentially cracks the heavy hydrocarbons, thereby decreasing the yields of heavy pitch and coke. The catalyst loading is critical, triggering a rapid increase in the cracking/deoxygenation extent upon increasing the catalyst loading to 40 wt%. Afterwards, the change on the extent of these two reactions is marginal. Based on the gaseous products, the content of CO2 is the highes...
Source: Journal of Analytical and Applied Pyrolysis - Category: Chemistry Source Type: research
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