Journal
JOURNAL OF CATALYSIS
Volume 343, Issue -, Pages 127-132Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2016.02.005
Keywords
CO2 hydrogenation; Methanol synthesis; High-pressure; Kinetics; Thermodynamics; Cu/ZnO/Al2O3
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Funding
- ICIQ Foundation
- MINECO [CTQ2012-34153, EEBB-I-15-10528]
- Catalan government [2014 SGR 893]
- MINECO through Severo Ochoa Excellence Accreditation [SEV-2013-0319]
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Interplay between three important reaction parameters (pressure, temperature, and space velocity) in stoichiometric hydrogenation of carbon dioxide (CO2:H-2 = 1:3) was systematically investigated using a commercial Cu/ZnO/Al2O3 catalyst. Their impacts on reaction performance and important ranges of process conditions toward full one-pass conversion of CO2 to methanol at high yield were rationalized based on the kinetics and thermodynamics of the reaction. Under high-pressure condition above a threshold temperature, the reaction overcomes kinetic control, entering thermodynamically controlled regime. Ca. 90% CO2 conversion and >95% methanol selectivity were achieved with a very good yield (0.9-2.4 g(MeOH) g(cat)(-1) h(-1)) at 442 bar. Such high-pressure condition induces the formation of highly dense phase and consequent mass transfer limitation. When this limitation is overcome, the advantage of high-pressure conditions can be fully exploited and weight time yield as high as 15.3 g(MeOH) g(cat)(-1) h(-1) could be achieved at 442 bar. Remarkable advantages of high-pressure conditions in terms of reaction kinetics, thermodynamics, and phase behavior in the aim to achieve better methanol yield are discussed. (C) 2016 Elsevier Inc. All rights reserved.
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