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Investigation into role of CO in two-stage pyrolysis of spent coffee grounds. | LitMetric
As a way of improving process efficiency of pyrolysis of waste biomass, the effect of carbon dioxide (CO) on pyrolysis of spent coffee grounds (SCGs) was examined using a two-stage pyrolysis reactor consisting of a region with increasing temperature and an isothermal region. It was experimentally validated that CO accelerates thermal cracking of organic compounds formed during the pyrolysis of SCGs. The expedited thermal cracking attributed to employing CO in pyrolysis of SCGs led to changing pyrolytic products in gas, liquid, and solid phases. The production of gaseous carbon monoxide was increased when using CO as the pyrolysis medium. In liquid pyrolytic products, the formation of phenolic compounds was hindered in the CO-assited pyrolysis. Biochar morphology (solid pyrolytic product) was also changed with different pyrolysis environments. This study shows that CO can help improve applicability of pyrolysis of waste biomass by modifying three phase pyrolytic products in a two-stage pyrolyzer.
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