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Orinakova, Renata
Tomas Bata University in Zlín
in Cooperation with on an Cooperation-Score of 37%
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article
Pyrolysis Degradation of Cellulose over Highly Effective ZnO and ZnO-CuO Nanocatalysts
Abstract
Pyrolysis of lignocellulosic biomass with the use of appropriative catalysts can lead to the production of high yields of fuels - bio-oils. Here, zinc oxide - copper oxide (ZnO-CuO) nanocatalysts were synthesized by solvothermal synthesis. High-angle annular dark-field imaging scanning transmission electron microscopy (HAADF-STEM), high-resolution transmission electron microscopy (HRTEM), and energy-dispersive X-ray spectroscopy (EDXS) results suggested that ZnO-CuO nanoparticles (D=23 +/- 5 nm) exhibit porous nanostructure. The pyrolytic degradation of cellulose using pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) unit has been studied over ZnO and ZnO-CuO nanocatalysts at the temperature range 400-800 degrees C. The activation energy of ZnO-CuO (67.21 and 70.04 kJ/mol) was lower by 30 kJ/mol from the activation energy of clean ZnO and the calculated rate constants showed that the cellulose pyrolytic reaction is faster using ZnO-CuO catalyst. Nanoporous ZnO-CuO shifted the products maximum towards lower temperatures (<500 degrees C), reduced the content of aldehydes at 400-500 degrees C and enhanced the overall product composition and bio-oil yield. Porous structure of ZnO nanocatalysts had a significant effect on the product selectivity and reaction mechanism of cellulose pyrolysis.