Exploration of the role of anions in the synthesis of Cr containing mesoporous materials at room temperature

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• 作者：Luther Mahoney^a ; Chia-Ming Wu^a ; Harrison S. Kibombo^a ; Eagappanath Thiruppathi^a ; Jonas Baltrusaitis^b ; Shivatharsiny Rasalingam^a ; Ranjit T. Koodali^a ; ^{Ranjit.Koodali@usd.edu}
• 关键词：Mesoporous ; Cr-MCM-48 ; Chromium salts ; Cubic phase
• 刊名：Microporous and Mesoporous Materials
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：170
• 期：Complete
• 页码：211-225
• 全文大小：2238 K

文摘

Chromium containing mesoporous silica materials were synthesized via a modified St?ber synthesis at room temperature. The chromium ion loading and the effect of counter ion in the synthesis were studied in detail. The mesoporous materials were extensively characterized by powder X-ray diffraction (XRD), N₂ physisorption, Atomic Absorption Spectroscopy (AAS), Fourier-Transform-Infrared Spectroscopy (FT-IR), Diffuse Reflectance Spectroscopy (DRS UV-Vis), hydrogen Temperature-Programmed Reduction (H₂-TPR), X-ray Photoelectron Spectroscopy (XPS), and Transmission Electron Microscopy (TEM) studies. A transition from Iad cubic phase to p6mm hexagonal or wormhole phases was noted as more amounts of chromium were incorporated into the siliceous materials. Chromium species present in the silica matrix include monochromate, polychromate, and chromium oxide (Cr₂O₃) clusters.