Regeneration of Spent HY Zeolite Obtained After Bio-Oil Cracking in the Presence of CO2
The CO2 recycling into refinery is of primary importance nowadays. The FCC catalyst regeneration in rich CO2 atmosphere can produce a large amount of CO for sequential uses. In addition the possibility of bio-oil up-grade largely increases coke amount in the catalyst
therefore making the FCC process a powerful tool to enhance greenhouse gas mitigation. Coke obtained during bio-oil cracking over a HY zeolite was regenerated in CO2 rich atmosphere. The coke amount determined by elemental analysis was 13.2% wt on HY and presented the following
composition in ash-free basis: C/H/N/O = 76.07, 4.57, 0.27, and 19.09. Coke is composed by poly-aromatic and aliphatic carbons, determined quantitative by 13C solid state NMR and confirmed by FTIR. A thermal treatment in helium atmosphere decreased the aliphatic carbon content and
increased the amount of aromatic carbon. The reverse Boudouard reaction was performed in a flow of 13C-labeled CO2 and the 13CO/13CO2 ratio varied from 0.08 to 0.7 as reaction temperature increases from 680 to 940 C. Firstly 13CO2
reacts with coke forming 13CO (m/z = 29) and coke partially oxidized (forming ether or ketone type compounds), CO2 (m/z = 44) is formed simultaneously to13 CO, and CO (m/z = 28) is formed both simultaneously and sequentially to the former13
CO, whose formation largely decreases by raising the reaction temperature. The activation energy during the initial reverse Boudouard reaction was estimated to 127 and 125 kJ · mol–1 under isothermal and non-isothermal conditions, respectively.
Keywords: ACTIVATION ENERGY; BIO-OIL; CO2 CAPTURE; REVERSE BOUDOUARD REACTION
Document Type: Research Article
Publication date: 01 September 2013
- Advanced Chemistry Letters is an international multidisciplinary peer-reviewed journal covering all fundamental and applied research areas of chemical sciences including organic chemistry, inorganic chemistry, synthetic chemistry, medicinal chemistry, analytical chemistry, organometallic chemistry, nuclear chemistry, electrochemistry, atmospheric chemistry, environmental chemistry, materials chemistry, materials science, supramolecular chemistry, physical chemistry, polymer chemistry, bioinorganic chemistry, physical organic chemistry, surface chemistry, biochemistry, molecular biology, chemical biology, food chemistry, natural product chemistry, neurochemistry, pharmacology, photochemistry, photobiology, toxicology, nanoscience, nanotechnology, agrochemistry, green chemistry, marine chemistry, geochemistry, petrochemistry, radiochemistry, astrochemistry, molecular physics, chemical engineering, quantum chemistry, and theoretical and computational chemistry.
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