高排序的半孔材料的绿色合成
Guodong Feng1,2, Jianyu Wang1, Mercedes Boronat3
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , People's Republic of China.
Journal of the American Chemical Society
|March 29, 2018
概括
这项研究引入了一种无酸方法,用于利用基自由基合成有序化二氧化 (SBA-15) 和铁化SBA-15. 这种绿色方法提高了材料的性能,并简化了生产.
科学领域:
- 材料科学
- 纳米技术
- 绿色化学
背景情况:
- 常规合成有序中等孔SBA-15需要强酸.
- 强烈的酸性条件阻碍了铁等过渡金属在SBA-15中因键解离而融入.
研究的目的:
- 开发一种无酸,环保的高排序中体SBA-15和Fe-SBA-15的合成方法.
- 研究基自由基作为这种合成的催化剂的有效性.
主要方法:
- 用物理或化学方法生成的基自由基进行水热合成.
- 密度功能理论 (DFT) 的计算,以比较基和H+离子的催化活性.
- 对表面积和金属负荷的合成材料的表征.
主要成果:
- 在没有使用任何酸的前提下成功合成高排序的SBA-15和Fe-SBA-15.
- 与酸合成对应物相比,制备的材料具有更大的特定表面积.
- 在Fe-SBA-15中获得高铁负载效率 (>50%).
- DFT计算证实了基自由基的催化活性高于H+在二氧化水解方面.
结论:
- 与强酸相比,基自由基为SBA-15和Fe-SBA-15合成提供了优越的催化途径.
- 这种由激素促进的方法为生产有序半孔材料提供了一个简单,绿色和可扩展的途径.
- 克服了酸催化方法的局限性,使得高效的金属合并成为可能.
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