中空 ZrO(2)TiO(2)/Au 球的合成与表征作为一种具有高热稳定性的纳米催化剂。
Synthesis and characterization of hollow ZrO(2)TiO(2)/Au spheres as a highly thermal stability nanocatalyst.
机构信息
School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing 211189, China.
出版信息
J Colloid Interface Sci. 2017 Jul 1;497:23-32. doi: 10.1016/j.jcis.2017.02.052. Epub 2017 Feb 24.
A novel binary-metal-oxide-coated hollow microspheres-titanium dioxide-zirconium dioxide-coated Au nanocatalyst was prepared via a facile hydrothermal synthesis method. SEM, TEM, EDX, FTIR, XRD, UV-vis and XPS analyses were employed to characterize the composition, structure, and morphology of ZrO-TiO hollow spheres. The size of Au nanoparticles was found to be 3-5nm in diameter before being immobilized on the aforementioned mesoporous ZrO-TiO layer and used as catalysts in the reduction of 4-nitrophenol to 4-aminophenol by NaBH. Compared with TiO/Au and ZrO/Au, ZrO-TiO/Au NPs showed a higher catalytic activity because of due to mixed oxide synergistic effect. Besides, the sample gets the highest thermal stability and reactivity at 550°C, after calcining the hollow ZT/Au NPs at 550°C, 300°C and room temperature, respectively. Finally, a possible reaction mechanism was also proposed to explain the reduction of 4-nitrophenol to 4-aminophenol over ZrO-TiO/Au catalyst.
一种新型二元金属氧化物包覆的中空微球-二氧化钛-二氧化锆包覆金纳米催化剂，通过简便的水热合成方法制备。采用 SEM、TEM、EDX、FTIR、XRD、UV-vis 和 XPS 分析对 ZrO-TiO 中空球的组成、结构和形态进行了表征。发现 Au 纳米粒子的尺寸在被固定在上述介孔 ZrO-TiO 层上并用作 NaBH 还原 4-硝基苯酚为 4-氨基酚的催化剂之前为 3-5nm 直径。与 TiO/Au 和 ZrO/Au 相比，ZrO-TiO/Au NPs 由于混合氧化物协同效应表现出更高的催化活性。此外，在 550°C 下煅烧中空 ZT/Au NPs 后，该样品在 550°C、300°C 和室温下分别表现出最高的热稳定性和反应性。最后，还提出了一种可能的反应机理来解释 ZrO-TiO/Au 催化剂上 4-硝基苯酚还原为 4-氨基酚的反应。
Zotero 插件