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Synergetic Impact of Secondary Metal Oxides of Cr-M/MCM41 Catalyst Nanoparticles for Ethane Oxidative Dehydrogenation Using Carbon Dioxide

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Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia
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King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia
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Central Metallurgical Research and Development Institute, CMRDI, Helwan 11421, Egypt
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(1), 7; https://doi.org/10.3390/cryst10010007
Received: 26 November 2019 / Revised: 10 December 2019 / Accepted: 11 December 2019 / Published: 20 December 2019
(This article belongs to the Section Crystalline Materials)
Oxidative dehydrogenation of alkanes to alkenes by a mild oxidant such as carbon dioxide is an active area of research. A series of MCM41-supported bimetallic oxide catalysts containing chromium oxide in addition to metal oxides (Ce, Co, Zn, V, Nb, and Mo) has been prepared. The binary catalysts have Cr metal oxide incorporated into MCM41 structure while the other oxides are either incorporated with Cr or impregnated on the MCM41 surface. The synthesized catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 sorption, scanning electron microscopy (SEM), hydrogen temperature programmed reduction (H2-TPR), and Diffuse reflectance UV–vis spectroscopy (DRS). The catalytic activity of Cr(4)-M(4)/MCM-41 catalysts in the dehydrogenation of ethane with CO2 was investigated. The textural properties of the synthesized samples showed that the addition of the bimetallic oxides did not disturb the mesoporous structure of MCM41 and the prepared catalysts exhibited a high BET surface area; however, the lowest surface area was recorded for Cr(4)-Mo(4)/MCM41 catalyst at 701 m2/g. Among the prepared catalysts, H2-TPR profile of Cr(4)-Ce(4)/MCM41 revealed the increase in the concentration of Cr6+ species which interacted with the framework of siliceous support. On the other hand, H2-TPR profiles of Cr(4)-Co(4)/MCM41 showed wide reduction peaks centered at 400 °C which is ascribed to reduction of Cr6+ to Cr3+ species and Co3O4 to metallic Co. At the same time, Cr(4)-Mo(4)/MCM41 and Cr(4)-V(4)/MCM41 exhibited higher temperature reduction peaks, indicating these two catalysts require higher activation temperatures. The synergy between the Cr with Zn or Nb metals reduced the concentration of Cr6+ species which is reflected in their catalytic performance. Cr(4)-Ce(4)/MCM41 recorded the highest catalytic activity toward ethylene production where the ethane conversion and ethylene yield were 37.9% and 35.1%, respectively. View Full-Text
Keywords: bimetallic oxide; Cr-based catalyst; mesoporous silica; ethane oxidative dehydrogenation; CO2 bimetallic oxide; Cr-based catalyst; mesoporous silica; ethane oxidative dehydrogenation; CO2
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Al-Awadi, A.S.; El-Toni, A.M.; Alhoshan, M.; Khan, A.; Shar, M.A.; Abasaeed, A.E.; Al-Zahrani, S.M. Synergetic Impact of Secondary Metal Oxides of Cr-M/MCM41 Catalyst Nanoparticles for Ethane Oxidative Dehydrogenation Using Carbon Dioxide. Crystals 2020, 10, 7.

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