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Open AccessArticle

Overcoming Stability Problems in Microwave-Assisted Heterogeneous Catalytic Processes Affected by Catalyst Coking

1
Institute of Nanocience of Aragon (INA) and Department of Chemical and Environmental Engineering (IQTMA), University of Zaragoza, 50018 Zaragoza, Spain
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Instituto de Ciencia de Materiales de Aragon (ICMA), Consejo Superior de Investigaciones Científicas (CSIC-Universidad de Zaragoza), 50009 Zaragoza, Spain
3
Networking Research Centre CIBER-BBN, 28029 Madrid, Spain
4
Center for Nano Production and Micro Analysis, Danish Technological Institute, DK-2630 Taastrup, Denmark
5
Sairem, 82 rue Elisée Reclus, 69150 Décines-Charpieu, France
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(10), 867; https://doi.org/10.3390/catal9100867
Received: 30 September 2019 / Revised: 13 October 2019 / Accepted: 14 October 2019 / Published: 19 October 2019
(This article belongs to the Special Issue Microwave-Assisted Catalysis)
Microwave-assisted heterogeneous catalysis (MHC) is gaining attention due to its exciting prospects related to selective catalyst heating, enhanced energy-efficiency, and partial inhibition of detrimental side gas-phase reactions. The induced temperature difference between the catalyst and the comparatively colder surrounding reactive atmosphere is pointed as the main factor of the process selectivity enhancement towards the products of interest in a number of hydrocarbon conversion processes. However, MHC is traditionally restricted to catalytic reactions in the absence of catalyst coking. As excellent MW-susceptors, carbon deposits represent an enormous drawback of the MHC technology, being main responsible of long-term process malfunctions. This work addresses the potentials and limitations of MHC for such processes affected by coking (MHCC). It also intends to evaluate the use of different catalyst and reactor configurations to overcome heating stability problems derived from the undesired coke deposits. The concept of long-term MHCC operation has been experimentally tested/applied to for the methane non-oxidative coupling reaction at 700 °C on Mo/[email protected] structured catalysts. Preliminary process scalability tests suggest that a 6-fold power input increases the processing of methane flow by 150 times under the same controlled temperature and spatial velocity conditions. This finding paves the way for the implementation of high-capacity MHCC processes at up-scaled facilities. View Full-Text
Keywords: microwave-assisted heating; heterogeneous catalysis; catalyst coking microwave-assisted heating; heterogeneous catalysis; catalyst coking
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MDPI and ACS Style

Julian, I.; Pedersen, C.M.; Achkasov, K.; Hueso, J.L.; Hellstern, H.L.; Silva, H.; Mallada, R.; Davis, Z.J.; Santamaria, J. Overcoming Stability Problems in Microwave-Assisted Heterogeneous Catalytic Processes Affected by Catalyst Coking. Catalysts 2019, 9, 867.

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