| 第 39 卷第 6 期 |  | Vol. 39 No. 6 | | 2009 年 12 月 | Dec 2009 |
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所屬欄目：功能材料
Salen-Co配合物在核-殼結構的Silica上的接枝及催化性能的研究 |
| 周建波，伏再輝，曾 明，曾小軍，崔小瑩
（長(cháng)沙醫學(xué)院，湖南 長(cháng)沙 410219） |
| 摘 要：分別以球狀納米silica和懸浮聚合法制備的核-殼型silica -苯乙烯與丙烯酸甲酯共聚物雜化體為載體，采用化學(xué)接枝方法，制備了Salen-Co配合物固載型催化劑。采用FT-IR、TG-DTA和TEM對這些催化劑進(jìn)行了表征。結果表明：核-殼型催化劑其殼層性質(zhì)可通過(guò)改變兩個(gè)單體的比例來(lái)調變，隨單體丙烯酸甲酯比例的增加，殼層由聚苯乙烯占優(yōu)逐漸過(guò)渡到以聚丙烯酸甲酯為主，接枝的鈷配合物負載量也相應增加。在以分子氧作氧化劑，異丁醛作犧牲醛，催化環(huán)己烯氧化反應中，核-殼型催化劑在反應速度和環(huán)氧選擇性上均優(yōu)于silica型催化劑；相反，在反式二苯乙烯氧化反應中，則是后者明顯優(yōu)于前者。造成這種差別的原因很可能與殼層表面聚合物與兩個(gè)反應底物的親和力差異顯著(zhù)有關(guān)。 |
| 關(guān)鍵詞：納米二氧化硅；核-殼結構；Salen-Co；環(huán)氧化 |
| 中圖分類(lèi)號：TQ252.5 文獻標識碼：A 文章編號：1009-9212（2009）06- 0063-06 |
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| Chemically Grafting and Catalytic Performances of Salen-Co Complex onto Silica and Core-shell Silica for Epoxidation of Alkene with Oxygen in the Presence of Isobutyraldehyde |
| ZHOU Jian-bo，FU Zai-hui，ZENG Ming，ZENG Xiao-jun，CUI Xiao-ying
（Changsha Medical University，Changsha 410219） |
| Abstract：By means of chemically grafting method，Salen-Co complex has been successfully bonded onto the surfaces of nano-silica and inorganic-organic hybrid carriers which consist of nano-silica core and styrene and methyl acrylate copolymers shell. The prepared catalysts were characterized by FT-IR，TG-DTA and TEM. The characterization results indicated that the shell layer properties of the core-shell carriers could be adjusted by varying the ratio of the two monomer，the shell with the majority of poly-styrene was gradually transmitted to be characteristic of the poly methyl acrylate with increasing methyl acrylate. In catalyzing the epoxidation of cyclohexene，the Co complexes with the core-shell carriers showed a higher catalytic activity than with nano-silica carriers. This is mainly due to the former has a better affinity to the substrate than the latter. However，in catalyzing the epoxidation of E-stilbene，the reversed results were obtained. This is likely because of affinity differences between the catalysts and the substvates. |
| Key words：nano-silica；core-shell structure；Salen-co；epoxidation |
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基金項目：國家自然科學(xué)基金資助項目（20573035）。
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作者簡(jiǎn)介：周建波（1979-），女，湖南衡陽(yáng)人，講師，主要從事不對稱(chēng)催化合成。（E-mail：zhoujianbo0603@126.com）
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收稿日期： 2009-11-0
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