Ionic liquid-enhanced immobilization of biosynthesized Au nanoparticles on TS-1 toward efficient catalysts for propylene epoxidation
Ionic liquid-enhanced immobilization of biosynthesized Au nanoparticles on TS-1 toward efficient catalysts for propylene epoxidation
复制标题
离子液体增强生物合成金纳米粒子在 TS-1 上的固定化，用于丙烯环氧化的高效催化剂
DOI：
10.1016/j.jcat.2011.08.011
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发表时间：
2011-10-27
影响因子：
7.3
通讯作者：
Li, Qingbiao
中科院分区：
文献类型：
--
作者：
Du, Mingming;Zhan, Guowu;Li, Qingbiao
采用离子液体增强固定化（ILEI）法制备不同金、钛含量的金催化剂，在氢气和氧气存在下，在7000 mL h(-1) g(cat)(-1)空速下，研究了丙烯的直接气相环氧化反应，其中生物合成的金纳米粒子（GNP）通过少量的辅助剂固定在钛硅沸石-1（TS-1）载体上。 1-丁基-3-甲基咪唑鎓四氟硼酸盐 ([BMIM][BF4])。结果表明[BMIM]。特别吸附到载体上以提高其等电点，从而增强固定化。丙烯转化率为14.6%，PO形成率为164.4 g(po) K g(cat)(-1) h(-1)，均高于任何其他报道，可能归因于GNP和TS-1之间相互作用的增强。此外，Au/TS-1催化剂在较高反应温度下优异的活性和高选择性可能归因于催化剂上残留生物分子的存在。 (C) 2011 Elsevier Inc. 保留所有权利。
The direct vapor-phase epoxidation of propylene in the presence of hydrogen and oxygen was studied at a space velocity of 7000 mL h(-1) g(cat)(-1), over gold catalysts with varying gold and titanium contents prepared by ionic liquid-enhanced immobilization (ILEI) method in which biosynthesized gold nanoparticles (GNPs) were immobilized onto the titanium silicalite-1 (TS-1) supports through the assistance of a small amount of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]). The results showed that [BMIM]. specially adsorbed onto the support to increase its isoelectric point, leading to the enhanced immobilization. The propylene conversion of 14.6% and PO formation rate of 164.4 g(po) K g(cat)(-1) h(-1) were higher than those in any other reports, probably attributing to enhanced interaction between the GNPs and TS-1. Furthermore, the excellent activity and high selectivity of the Au/TS-1 catalysts at a relatively high reaction temperature might be attributed to the existence of residual biomolecules on the catalysts. (C) 2011 Elsevier Inc. All rights reserved.