SnO2鈥揅uO鈥揘aCl/SiO2 Catalysts for Propylene Epoxidation

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• 作者：Aaron Miller ; Bahman Zohour ; Anusorn Seubsai ; Daniel Noon ; Selim Senkan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：July 17, 2013
• 年：2013
• 卷：52
• 期：28
• 页码：9551-9555
• 全文大小：355K
• 年卷期：v.52,no.28(July 17, 2013)
• ISSN：1520-5045

文摘

The discovery of heterogeneous catalysts capable of direct gas-phase production of propylene oxide (PO) from propylene and molecular oxygen remains a challenge in industrial catalysis. The SnO₂鈥揅uO鈥揘aCl/SiO₂ system has been shown to produce PO at 55鈥?0% selectivity with propylene conversion of 1% at 250 掳C and 1 bar. A product shift toward CO₂, found to occur during continuous operation, was counteracted by cofeeding 10鈥?0 ppm 1-chloropropane, maintaining peak PO selectivities for 12 h. Temperature-programmed-reduction (TPR) studies indicated that Na increases copper dispersion. Additional catalyst characterization studies performed by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed the presence of distinct phases of CuO, SnO₂, and NaCl.