75392 20200616135722.0 doi 10.1016/j.cej.2018.08.150 sideral 107836 ART-2018-107836 eng (orcid)0000-0003-3211-0485 Julian, Ignacio Non-oxidative methane conversion in microwave-assisted structured reactors 2018 Access copy available to the general public Unrestricted The main problem to be addressed in the valorization of methane under non-oxidative conditions (MNOC) is to reduce or even avoid coke formation. In this work we report the use of microwave-assisted heating for MNOC. We have developed a system able to heat-up a Mo-ZSM5 catalyst coated on silicon carbide monolith that could operate stable for at least 19¿h at reaction conditions, 700°C. We demonstrate that under MW-heating the selectivity shifts to C2s and benzene. In contrast, the operation under conventional heating (CH) produces more coke and polyaromatics. The selective microwave heating has two effects in this reaction: i) during the activation of the catalyst the formation of the active catalytic species of Mo2C inside the microporous support is different affecting the selectivity and product distribution; ii) a gas-solid temperature gradient is established that prevents the formation of coke from PAHs in the gas phase. The MNOC process under controlled MW heating at high space velocity (3000¿mL/gcat·h) gives a hydrocarbon yield of around 6% with a very low deactivation rate. These results open up new possibilities for process intensification using alternative sources of energy, as is the case of microwaves, for heating structured catalytic reactors. This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 680777-ADREM info:eu-repo/grantAgreement/EC/H2020/680777/EU/Adaptable Reactors for Resource- and Energy-Efficient Methane Valorisation/ADREM info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 8.355 2018 ENGINEERING, ENVIRONMENTAL 2 / 52 = 0.038 2018 Q1 T1 ENGINEERING, CHEMICAL 6 / 138 = 0.043 2018 Q1 T1 2.066 2018 Chemical Engineering (miscellaneous) 2018 Q1 Chemistry (miscellaneous) 2018 Q1 Industrial and Manufacturing Engineering 2018 Q1 Environmental Chemistry 2018 Q1 Engineering (miscellaneous) 2018 Q4 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Ramirez, Heidy (orcid)0000-0002-4546-4111 Hueso, Jose L. (orcid)0000-0002-4758-9380 Mallada, Reyes Universidad de Zaragoza (orcid)0000-0002-8701-9745 Santamaria, Jesus Universidad de Zaragoza 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 377, 119764 (2018), [12 pp.] Chem. eng. j. CHEMICAL ENGINEERING JOURNAL 1385-8947 3570191 http://zaguan.unizar.es/record/75392/files/texto_completo.pdf Postprint 85190 http://zaguan.unizar.es/record/75392/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:75392 articulos driver 2020-06-16-13:50:49 ARTICLE