Heterogenous Catalysis Mediated by Plasmon Heating
Heterogenous Catalysis Mediated by Plasmon Heating
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DOI：
10.1021/nl902711n
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发表时间：
2009-12-01
期刊：
影响因子：
10.8
通讯作者：
Psaltis, Demetri
中科院分区：
文献类型：
--
作者：
Adleman, James R.;Boyd, David A.;Psaltis, Demetri
我们介绍了一种用于进行和小型化多种涉及纳米颗粒的多相催化的新方法。该方法利用纳米级金属催化剂中存在的等离子体共振，在用低功率激光照射时提供必要的反应热。我们展示了我们的方法，通过在微流体通道中的金纳米颗粒催化剂上重整流动的乙醇和水的液体混合物。纳米颗粒的等离子体激元加热不仅提供反应热，而且提供在催化剂上局部产生水和乙醇蒸汽的手段，这反过来又允许芯片和流体管线保持在室温下。所测量的反应产物CO2、CO和H-2与乙醇的催化蒸汽重整一致。我们称之为等离子体辅助催化的方法是通用的，可以用于涉及纳米颗粒的各种吸热催化过程。
We introduce a new method for performing and miniaturizing many types of heterogeneous catalysis involving nanoparticles. The method makes use of the plasmon resonance present in nanoscale metal catalysts to provide the necessary heat of reaction when illuminated with a low-power laser. We demonstrate our approach by reforming a flowing, liquid mixture of ethanol and water over gold nanoparticle catalysts in a microfluidic channel. Plasmon heating of the nanoparticles provides not only the heat of reaction but the means to generate both water and ethanol vapor locally over the catalysts, which in turn allows the chip and the fluid lines to remain at room temperature. The measured products of the reaction, CO2, CO, and H-2, are consistent with catalytic steam reforming of ethanol. The approach, which we refer to as plasmon-assisted catalysis, is general and can be used with a variety of endothermic catalytic processes involving nanoparticles.