A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application
A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application
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DOI：
10.1002/cctc.201801036
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发表时间：
2018-09
期刊：
影响因子：
4.5
通讯作者：
H. Tang;Yongfei Li;Ning Liu;Lin Fu;Yuejin Liu
中科院分区：
文献类型：
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作者：
H. Tang;Yongfei Li;Ning Liu;Lin Fu;Yuejin Liu
制备了一种新型KF改性纳米棒载体Zr-Ce氧化物作为高效固体碱催化剂。采用XRD、FT-IR、CO2-TPD、TEM-EDS和拉曼对催化剂进行表征。结果表明，适当的活化温度有利于K+插入ZrO 2 − CeO 2纳米棒载体的空位位，KF的加入使ZrO 2 − CeO 2纳米棒载体上产生了K3 Zr 2F 11、KCe 2F 9、Ce 2 Zr 2 O 7等新的强碱性活性位。所制备的KF/ZrO 2 − CeO 2固体碱催化剂对大豆油与甲醇的酯交换反应具有较高的活性和稳定性。结果表明，在KF负载量为15wt%、焙烧温度为400 °C、醇油摩尔比为20：1、催化剂用量为5wt%（wt/wt油）、反应温度为65 °C、反应时间为5 h的条件下，生物柴油产率可达99.8%。探讨了KF/ZrO 2 − CeO 2催化剂碱性活性中心的形成和催化反应机理。
A novel KF‐modified nanorod support Zr−Ce oxide as an efficient solid base catalyst was prepared. XRD, FT‐IR, CO2‐TPD, TEM‐EDS, and Raman were employed for the catalyst characterization. The results showed that the appropriate activation temperature could facilitate the insertion of K+ into the vacancy sites of the ZrO2−CeO2 nanorod support, and some new strong basic active sites of K3Zr2F11, KCe2F9, Ce2Zr2O7 were generated with the addition of KF on the mixed ZrO2−CeO2 support. The prepared KF/ZrO2−CeO2 as a solid base catalyst exhibited high activity and stability for transesterification of soybean oil with methanol to biodiesel. The high biodiesel yield of 99.8 % was obtained under the following conditions: 15 wt % KF loading amount, calcination temperature 400 °C, molar ratio of methanol/oil 20 : 1, 5 wt % catalyst account (wt/wt oil), reaction time 5 h at 65 °C. The formation of basic active sites of the KF/ZrO2−CeO2 catalyst and the mechanism for the catalytic reaction were explored.