Escaping undesired gas-phase chemistry: Microwave-driven selectivity enhancement in heterogeneous catalytic reactors

Ramirez, A. ; Hueso, J.L. ; Abian, M. (Universidad de Zaragoza) ; Alzueta, M.U. (Universidad de Zaragoza) ; Mallada, R. (Universidad de Zaragoza) ; Santamaria, J. (Universidad de Zaragoza)

Resumen: Research in solid-gas heterogeneous catalytic processes is typically aimed toward optimization of catalyst composition to achieve a higher conversion and, especially, a higher selectivity. However, even with the most selective catalysts, an upper limit is found: Above a certain temperature, gas-phase reactions become important and their effects cannot be neglected. Here, we apply a microwave field to a catalyst-support ensemble capable of direct microwave heating (MWH). We have taken extra precautions to ensure that (i) the solid phase is free from significant hot spots and (ii) an accurate estimation of both solid and gas temperatures is obtained. MWH allows operating with a catalyst that is significantly hotter than the surrounding gas, achieving a high conversion on the catalyst while reducing undesired homogeneous reactions. We demonstrate the concept with the CO 2 -mediated oxidative dehydrogenation of isobutane, but it can be applied to any system with significant undesired homogeneous contributions.

Idioma: Inglés

DOI: 10.1126/sciadv.aau9000

Año: 2019

Publicado en: Science advances 5, 3 (2019), eaau9000 [7 pp]
ISSN: 2375-2548

Factor impacto JCR: 13.116 (2019)

Categ. JCR: MULTIDISCIPLINARY SCIENCES rank: 4 / 71 = 0.056 (2019) - Q1 - T1

Factor impacto SCIMAGO: 6.062 - Multidisciplinary (Q1)

Financiación: info:eu-repo/grantAgreement/EUR/ERC/HECTOR-267626
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2015-65226

Tipo y forma: Article (Published version)

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