Supercritical water gasification of microalgae over a two-component catalyst mixture

The Science of the Total Environment
Peigao DuanYuping Xu

Abstract

Supercritical water gasification (SCWG) of the microalga Chlorella pyrenoidosa was examined with a catalyst mixture of Ru/C and Rh/C in a mass ratio of 1:1. The influences of temperature (380-600°C), water density (0-0.197g/cm3), and catalyst loading (0-20wt%) on the yields and composition of the gaseous products and the gasification efficiency were examined. The temperature and water density significantly affected the SCWG of the microalgae. The hydrogen gasification efficiency was more dependent on the temperature, while the carbon gasification efficiency was more dependent on the water density. The gaseous products mainly consisted of CH4, H2, CO, and CO2, with smaller amounts of C2-C3 hydrocarbons. CH4 made up half of the mole fraction of the gaseous products under most reaction conditions. A synergistic effect between Ru/C and Rh/C existed during the SCWG of the microalgae, and this effect favored the production of CH4. The role of the catalyst mixture became indistinct at higher temperatures. Hydrogen atoms from the water were transferred to the gaseous products during the SCWG, leading to hydrogen gasification efficiencies that exceeded 100%. The main components of the bio-oil were aromatics and nitrogen-containing compo...Continue Reading

References

Aug 1, 1959·Canadian Journal of Biochemistry and Physiology·E G BLIGH, W J DYER
Nov 28, 2012·Science·Phillip E Savage
Apr 10, 2013·Bioresource Technology·Peigao DuanJuan Miao
Jun 19, 2016·The Science of the Total Environment·Bhavish PatelKlaus Hellgardt
Jun 6, 2017·The Science of the Total Environment·L RugniniL Bruno

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Citations

Oct 17, 2020·The Science of the Total Environment·Jayaseelan ArunArivalagan Pugazhendhi
Jan 9, 2021·The Science of the Total Environment·Pritam DasArivalagan Pugazhendhi
Jan 10, 2021·The Science of the Total Environment·Pritam DasArivalagan Pugazhendhi

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