High-yield synthesis of BTEX over Na–FeAlOx/Zn–HZSM-5@SiO2 by direct CO2 conversion and identification of surface intermediates
- Authors
- Sibi, M.G.[Sibi, M.G.]; Khan, M.K.[Khan, M.K.]; Verma, D.[Verma, D.]; Yoon, W.[Yoon, W.]; Kim, J.[Kim, J.]
- Issue Date
- Feb-2022
- Publisher
- Elsevier B.V.
- Keywords
- Aromatic synthesis; CO2 conversion; Modified Fischer–Tropsch synthesis; Operando diffuse reflectance infrared Fourier-transform spectroscopy
- Citation
- Applied Catalysis B: Environmental, v.301
- Indexed
- SCIE
SCOPUS
- Journal Title
- Applied Catalysis B: Environmental
- Volume
- 301
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/90182
- DOI
- 10.1016/j.apcatb.2021.120813
- ISSN
- 0926-3373
- Abstract
- We present a tandem catalyst consisting of Na-promoted bifunctional FeAlOx (Na–FeAlOx) and Zn-doped HZSM-5, the outer surface of which was coated with a SiO2 layer (Zn–HZSM-5@SiO2). This tandem catalyst afforded a high BTEX space–time yield of 4.0 mmol g–1 h–1 with a CO2 conversion of 45.2%. The selectivities toward BTEX were tuned by controlling the nature, density, and distribution of the Brønsted acid sites of the zeolites, in addition to adjusting the proximity between the Fe-based and zeolitic active sites. In situ operando experiments revealed the role of Zn–HZSM-5@SiO2 not only in dehydroaromatization, but also in CO2 adsorption, reverse water–gas shift reactions, and C–C coupling reactions. The findings of this study are promising for designing a tandem catalyst to directly convert CO2 to BTEX in high yields, and also provide novel insights into the reaction intermediates for this tandem catalyst. © 2021 Elsevier B.V.
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Collections - Engineering > School of Mechanical Engineering > 1. Journal Articles
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