Abstract
Silicoaluminophosphate molecular sieve, SAPO-11, was applied for the first time to the catalytic pyrolysis of xylan and dealkaline lignin. The isothermal fast catalytic pyrolysis of xylan and dealkaline lignin over different amounts of SAPO-11 and their product analysis were performed concurrently using a pyrolyzer GC/MS. Large amounts of oxygenated pyrolyzates produced from the non-catalytic pyrolysis of xylan at 500 °C were converted to furans, light hydrocarbons, and aromatic hydrocarbons using SAPO-11. When the catalyst to sample ratio was increased from 1:1 to 5:1 and 10:1, the selectivity toward aromatic hydrocarbons was increased dramatically. Phenolic compounds, such as guaiacols and vanillin, were the main products of the non-catalytic pyrolysis of dealkaline lignin. These phenolic compounds were upgraded efficiently into aromatics by the catalytic pyrolysis of dealkaline lignin over SAPO-11. By increasing the catalyst to sample ratio from 1:1 to 10:1, much larger amounts of aromatic hydrocarbons were obtained due to the increased catalyst acid sites. A phenolic pool mechanism was suggested as the major reaction pathway for the catalytic pyrolysis of dealkaline lignin over SAPO-11.
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Acknowledgements
This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (No. 20153030101580). Also, we would like to acknowledge the financial support from the R&D Convergence Program of NST (National Research Council of Science & Technology) of Republic of Korea (CAP-16-05-KIMM).
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Young-Min Kim and Hyung Won Lee are the co-first authors.
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Kim, YM., Lee, H.W., Jeon, JK. et al. In-Situ Catalytic Pyrolysis of Xylan and Dealkaline Lignin over SAPO-11. Top Catal 60, 644–650 (2017). https://doi.org/10.1007/s11244-017-0769-1
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DOI: https://doi.org/10.1007/s11244-017-0769-1