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21 results on '"Rabeah, Jabor"'

4. Effects of N2O and Water on Activity and Selectivity in the Oxidative Coupling of Methane over Mn–Na2WO4/SiO2: Role of Oxygen Species

Author

Aydin, Zeynep, primary, Zanina, Anna, additional, Kondratenko, Vita A., additional, Rabeah, Jabor, additional, Li, Jianshu, additional, Chen, Juan, additional, Li, Yuming, additional, Jiang, Guiyuan, additional, Lund, Henrik, additional, Bartling, Stephan, additional, Linke, David, additional, and Kondratenko, Evgenii V., additional

Published
2022
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5. Ni–In Synergy in CO2 Hydrogenation to Methanol

Author

Zhu, Jiadong, primary, Cannizzaro, Francesco, additional, Liu, Liang, additional, Zhang, Hao, additional, Kosinov, Nikolay, additional, Filot, Ivo. A. W., additional, Rabeah, Jabor, additional, Brückner, Angelika, additional, and Hensen, Emiel J. M., additional

Published
2021
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11. Unraveling the Origins of the Synergy Effect between ZrO2 and CrOx in Supported CrZrOx for Propene Formation in Nonoxidative Propane Dehydrogenation

Author

Han, Shanlei, primary, Zhao, Yun, additional, Otroshchenko, Tatiana, additional, Zhang, Yaoyuan, additional, Zhao, Dan, additional, Lund, Henrik, additional, Vuong, Thanh Huyen, additional, Rabeah, Jabor, additional, Bentrup, Ursula, additional, Kondratenko, Vita A., additional, Rodemerck, Uwe, additional, Linke, David, additional, Gao, Manglai, additional, Jiao, Haijun, additional, Jiang, Guiyuan, additional, and Kondratenko, Evgenii V., additional

Published
2019
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20. CeO 2 -Supported Single-Atom Cu Catalysts Modified with Fe for RWGS Reaction: Deciphering the Role of Fe in the Reaction Mechanism by In Situ/Operando Spectroscopic Techniques.

Author

Rabee AIM, Abed H, Vuong TH, Bartling S, Kraußer L, Atia H, Rockstroh N, Kondratenko EV, Brückner A, and Rabeah J

Abstract

Reverse water-gas shift (RWGS) reaction has attracted much attention as a potential approach for CO 2 valorization via the production of synthesis gas, especially over Fe-modified supported Cu catalysts on CeO 2 . However, most studies have focused solely on investigating the RWGS reaction over catalysts with high Cu and Fe loadings, thus leading to an increase in the complexity of the catalytic system and, hence, preventing the gain of any reliable information about the nature of the active sites and reaction mechanism. In this work, a CeO 2 -supported single-atom Cu catalyst modified with iron was synthesized and evaluated for the RWGS reaction. The catalytic results reveal a significant synergistic effect between CuCeO 2 and Fe, demonstrating an activity up to three times higher than the combined catalytic activities of monometallic catalysts (Fe/CeO 2 + CuCeO 2 ) under identical conditions. Various ex situ and in situ/operando techniques are employed to unveil the concealed role of Fe in catalyst activity enhancement. The combined findings from hydrogen temperature-programmed reduction (H 2 -TPR) and operando electron paramagnetic resonance spectroscopy (EPR) reveal that the added Fe predominantly interacts with Cu-containing surface sites, resulting in the stabilization of higher proportions of Cu single sites. Near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) and operando EPR results unveil a synergistic interplay of Fe with Cu-containing sites and CeO x domains, efficiently enhancing both the reoxidation of Cu + in Cu + -O v -Ce 3+ moieties and the reducibility of Ce 4+ in CeO x domains under RWGS conditions. Detailed mechanistic studies reveal that the RWGS reaction predominantly proceeds via the redox mechanism., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)

Published
2024
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21. Ni-In Synergy in CO 2 Hydrogenation to Methanol.

Author

Zhu J, Cannizzaro F, Liu L, Zhang H, Kosinov N, Filot IAW, Rabeah J, Brückner A, and Hensen EJM

Abstract

Indium oxide (In 2 O 3 ) is a promising catalyst for selective CH 3 OH synthesis from CO 2 but displays insufficient activity at low reaction temperatures. By screening a range of promoters (Co, Ni, Cu, and Pd) in combination with In 2 O 3 using flame spray pyrolysis (FSP) synthesis, Ni is identified as the most suitable first-row transition-metal promoter with similar performance as Pd-In 2 O 3 . NiO-In 2 O 3 was optimized by varying the Ni/In ratio using FSP. The resulting catalysts including In 2 O 3 and NiO end members have similar high specific surface areas and morphology. The main products of CO 2 hydrogenation are CH 3 OH and CO with CH 4 being only observed at high NiO loading (≥75 wt %). The highest CH 3 OH rate (∼0.25 g MeOH /(g cat h), 250 °C, and 30 bar) is obtained for a NiO loading of 6 wt %. Characterization of the as-prepared catalysts reveals a strong interaction between Ni cations and In 2 O 3 at low NiO loading (≤6 wt %). H 2 -TPR points to a higher surface density of oxygen vacancy (O v ) due to Ni substitution. X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and electron paramagnetic resonance analysis of the used catalysts suggest that Ni cations can be reduced to Ni as single atoms and very small clusters during CO 2 hydrogenation. Supportive density functional theory calculations indicate that Ni promotion of CH 3 OH synthesis from CO 2 is mainly due to low-barrier H 2 dissociation on the reduced Ni surface species, facilitating hydrogenation of adsorbed CO 2 on O v ., Competing Interests: The authors declare no competing financial interest., (© 2021 The Authors. Published by American Chemical Society.)

Published
2021
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