Improvement in thermal stability and catalytic activity of titanium containing mordenite by cerium using hydrothermal methods for hydroxylation of benzene into phenol

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• 作者：Ibraheem O. Ali ; Hussien A. El Sayed…
• 关键词：Mordenite synthesis ; Ce–Ti–Mordenite ; Hydrothermal synthesis ; Thermal kinetic ; Thermogravimetric analysis (TG)
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：123
• 期：2
• 页码：1129-1139
• 全文大小：1,132 KB
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• 作者单位：Ibraheem O. Ali (1)
  Hussien A. El Sayed (2)
  Karam S. El-Nasser (1)
  Ahmed A. Shabana (1)
  
  1. Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, 11884, Egypt
  2. Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, 11727, Egypt
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

Cerium–titanium–mordenite (Ce–Ti/Mor) were synthesized using ortho-phenylenediamine (OPDA) as a templating agent, and varying amounts of cerium (0.5–4.0 mol%) have been successfully prepared by direct hydrothermal synthesis. These micropore materials were compared with pure mordenite synthesized at the same conditions. The influence of Ce/Ti–Mor composite on the phase, crystal structure and morphology has been investigated by X-ray diffraction (XRD), scanning electron microscopy and Fourier transform infrared spectroscopy, respectively. The probable assignments of the thermal degradation products of OPDA in Ce–Ti/Mor samples were studied by complementary thermogravimetric analysis and differential scanning calorimetry. XRD appeared of α-quartz (Si₃O₆) phase in Ti–Mor disappeared by the addition of Ce and reformation of pure mordenite structure. The increase in unit cell parameters observed with replacement Al by Ti is indicative of incorporation of Ti into the framework structure of microporous material mordenite, while a decrease in unit cell by replacement of Ti by Ce attributed to the presence of Ce–O–Ti bond on the surface of mordenite. The hydroxylation of benzene to phenol has been extensively investigated using hydrogen peroxide as an oxidant. All the Ce-supported catalysts exhibited high catalytic activity in the oxidation of benzene. Keywords Mordenite synthesis Ce–Ti–Mordenite Hydrothermal synthesis Thermal kinetic Thermogravimetric analysis (TG)