Visible-light-driven reduction of nitrostyrene utilizing plasmonic silver nanoparticle catalysts immobilized on oxide supports
Visible-light-driven reduction of nitrostyrene utilizing plasmonic silver nanoparticle catalysts immobilized on oxide supports
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DOI：
10.1016/j.cattod.2019.03.058
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发表时间：
2020-09
期刊：
影响因子：
5.3
通讯作者：
Priyanka Verma;Yasutaka Kuwahara;K. Mori;H. Yamashita
中科院分区：
文献类型：
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作者：
Priyanka Verma;Yasutaka Kuwahara;K. Mori;H. Yamashita
局部表面等离子体共振（LSPR）介导的化学活性增强是一种很有前途的高效太阳能到化学能转换策略。调节化学反应中所需产物的选择性是至关重要的，但也是一项巨大的挑战。本文报道了一种在可见光照射下有效提高产物形成选择性的新策略。研究了在金属氧化物载体（TiO2、ZrO2、al2o3和CeO2）上沉积的一系列Ag催化剂及其制备工艺、最佳金属含量比和不同波长光对对硝基苯乙烯-氨基苯乙烯在可见光下的化学选择性还原效果。采用紫外可见、透射电子显微镜（TEM）和x射线光电子能谱（XPS）等理化手段对所制备的催化剂进行了表征。以氨硼烷（AB）为原位H2源，在常温常压乙醇悬浮液中进行还原反应。在光照条件下，Ag/ tio2的转化率达到100%，化学选择性达到81%。等离子体银的高化学选择性可能是由于在光照射条件下，极性硝基优先排列在等离子体银表面。
The localized surface plasmon resonance (LSPR) mediated enhanced chemical activity can be entitled as a promising strategy for efficient solar to chemical energy conversion. To tune the selectivity of a desired product in a chemical reaction is of paramount importance yet a great challenge. In this paper, a new strategy to effectively enhance the selectivity of the product formation under visible light irradiation is reported. A series of Ag catalysts deposited on metal oxide support materials (TiO2, ZrO2, Al2O3and CeO2) along with their preparative techniques, optimum metal content ratio and effect of different wavelength of light is explored for the chemoselective reduction ofp-nitrostyrene top-aminostyrene under visible light irradiation. The prepared catalysts were characterized by a range of physicochemical techniques including UV–vis, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The reduction reaction was carried out in ethanolic suspension at room temperature and pressure utilizing ammonia borane (AB) as an in-situ source of H2. The reaction results displayed 100% conversion with a maximum chemoselectivity of 81% shown by Ag/TiO2under light irradiation conditions. The high chemoselectivity could be attributed to the preferential alignment of polar nitro group on the surface of plasmonic silver under light irradiation conditions.