Swellable Organically Modified Silica (SOMS) as a Catalyst Scaffold for Catalytic Treatment of Water Contaminated with Trichloroethylene
Swellable Organically Modified Silica (SOMS) as a Catalyst Scaffold for Catalytic Treatment of Water Contaminated with Trichloroethylene
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DOI：
10.1021/acscatal.8b01700
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发表时间：
2018-06
期刊：
影响因子：
12.9
通讯作者：
G. Celik;Saurabh Ailawar;Hyuntae Sohn;Yu Tang;F. Tao;Jeffrey T. Miller;P. Edmiston;U. Ozkan
中科院分区：
文献类型：
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作者：
G. Celik;Saurabh Ailawar;Hyuntae Sohn;Yu Tang;F. Tao;Jeffrey T. Miller;P. Edmiston;U. Ozkan
可溶胀的有机改性二氧化硅（SOMS）支架的性能使我们能够合成“智能”催化剂，其活性位点由有机溶胀剂诱导，具有可调的可达性。钯纳米粒子（NPs）的SOMS的溶胀矩阵内沉积被证明是选择性地位于内表面上，这是唯一可通过溶胀的表面。技术，如近环境压力的X射线光电子能谱（NAP-XPS）和低温扫描电子显微镜（SEM）被用来表征Pd/SOMS在其溶胀以及未溶胀的状态，因为他们的传统的同行不保留Pd/SOMS的溶胀状态，在光谱采集。结果表明，Pd/SOMS的溶胀态和未溶胀态之间存在显著差异。最重要的区别是Pd NP在暴露于有机化合物后在表面上变得可接近。这表明活性位点的可达性可以通过改变温度来控制。
The properties of a swellable organically modified silica (SOMS) scaffold allowed us to synthesize “smart” catalysts with tunable accessibility of the active sites induced by organic swelling agents. Pd nanoparticles (NPs) deposited inside the swollen matrix of SOMS were shown to be selectively located on the interior surface, a surface which is only available through swelling. Techniques such as near ambient-pressure X-ray photoelectron spectroscopy (NAP–XPS) and cryogenic scanning electron microscopy (SEM) were employed to characterize Pd/SOMS in its swollen as well as unswollen state because their conventional counterparts do not preserve the swollen state of Pd/SOMS during spectral acquisition. The results obtained depicted significant differences between the unswollen and swollen state of Pd/SOMS. The most important difference is that Pd NPs became accessible on the surface after exposure to an organic compound. This indicates that the accessibility of the active sites can be controlled by changing t...