Non-oxidative methane conversion in microwave-assisted structured reactors

Julian, Ignacio ; Ramirez, Heidy ; Hueso, Jose L. ; Mallada, Reyes (Universidad de Zaragoza) ; Santamaria, Jesus (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.1016/j.cej.2018.08.150

Año: 2018

Publicado en: CHEMICAL ENGINEERING JOURNAL 377, 119764 (2018), [12 pp.]
ISSN: 1385-8947

Factor impacto JCR: 8.355 (2018)

Categ. JCR: ENGINEERING, ENVIRONMENTAL rank: 2 / 52 = 0.038 (2018) - Q1 - T1
Categ. JCR: ENGINEERING, CHEMICAL rank: 6 / 138 = 0.043 (2018) - Q1 - T1

Factor impacto SCIMAGO: 2.066 - Chemical Engineering (miscellaneous) (Q1) - Chemistry (miscellaneous) (Q1) - Industrial and Manufacturing Engineering (Q1) - Environmental Chemistry (Q1) - Engineering (miscellaneous) (Q4)

Financiación: info:eu-repo/grantAgreement/EC/H2020/680777/EU/Adaptable Reactors for Resource- and Energy-Efficient Methane Valorisation/ADREM

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)