Non-catalytic and In-situ catalytic co-pyrolysis of Huadian oil shale and microalgae using several additives as catalyst
The non-catalytic and in-situ catalytic co-pyrolysis of Huadian oil shale (OS) and microalgal powder (MP) were performed using a modified aluminum retort. By comparing the product yields and compositions for non-catalytic and catalytic pyrolyses, the catalytic effect of several additives, including...
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Published in | Journal of analytical and applied pyrolysis Vol. 172; p. 106012 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.06.2023
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Subjects | |
Online Access | Get full text |
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Summary: | The non-catalytic and in-situ catalytic co-pyrolysis of Huadian oil shale (OS) and microalgal powder (MP) were performed using a modified aluminum retort. By comparing the product yields and compositions for non-catalytic and catalytic pyrolyses, the catalytic effect of several additives, including MgO, CaO, ZrO2, Al2O3, zeolite Y, and zeolite ZSM-5, was investigated. This study focused on the deoxygenation performance of the pyrolytic oil. The oil yield increased with increasing MP addition in non-catalytic co-pyrolysis trials. At the OS/MP blending ratio of 3/1, the oil yield was 12.42 wt %, and the oxygen content and H/C ratio of oil were 11.54 wt % and 1.571, respectively. Both CaO and Al2O3 significantly decreased the oxygen content of the oil to <7 wt % with less oil loss (<1 wt %). CaO catalysis facilitated the dehydrogenation of free radicals to release H2, thereby increasing alkene formation and decreasing the H/C ratio of the oil to 1.441. Al2O3 catalysis increased the H/C ratio to 1.656 and improved the oil quality. ZSM-5 preferentially catalyzed the reaction between n-alkenes and nitrogenates to yield nitriles, and the catalytic performance for deoxygenation was negligible. Hence, Al2O3 was selected as the most suitable additive for the co-pyrolysis of OS and MP.
•CaO and Al2O3 decrease the oxygen content of the oil with less oil loss.•CaO facilitates the dehydrogenation of free radicals to release H2.•Al2O3 increases the H/C ratio of the oil and improved the oil quality.•ZSM-5 catalyzes the reaction between n-alkenes and nitrogenates to yield nitriles. |
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ISSN: | 0165-2370 1873-250X |
DOI: | 10.1016/j.jaap.2023.106012 |