空心γ-Al2O3微球作为CO氧化中金纳米颗粒催化剂的高“活性”载体

IF 2.2 4区 工程技术 Q2 Chemistry
Jie Wang, Zhen-Hao Hu, Yu-Xin Miao, Wen-Cui Li
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引用次数: 15

摘要

由紧密排列的纳米片,γ-Al2O3空心微球组成,约为4-6 ?直径500-700 ?以Al(NO3)3·9H2O为前驱体,尿素为沉淀剂,硫酸K2SO4、(NH4)2SO4或KAl(SO4)2·12H2O为添加剂,经过煅烧步骤,水热合成了壳厚为nm的膜。采用热重分析、扫描电镜、x射线粉末衍射、氮气吸附、CO的原位漫反射红外傅立叶变换光谱(DRIFTS)等方法对样品进行了表征。氧化铝产品的形貌强烈依赖于so422的存在。然后通过沉积-沉淀法,得到3?γ-Al2O3空心微球负载的% Au纳米颗粒表现出优异的性能,在0?°C (T 100% = 0°C)和50°C%的转换?25?°c(50°c = 25°c)。良好的催化活性与γ-Al2O3纳米片组成的特殊空心微球结构有关。drift证实了γ-Al2O3空心微球表面存在Auδ+和Au0。相比之下,在相同的催化测试条件下,使用形态不明的氧化铝载体制备的Au催化剂表现出较低的活性(T 100%?=?190?)°c, 50°c = 80°c)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Hollow γ-Al2O3 microspheres as highly “active” supports for Au nanoparticle catalysts in CO oxidation

Hollow γ-Al2O3 microspheres as highly “active” supports for Au nanoparticle catalysts in CO oxidation

Consisted of closely packed nanoflakes, γ-Al2O3 hollow microspheres with ca. 4–6?μm in diameter, and 500–700?nm in shell thickness have been hydrothermally synthesized through utilizing Al(NO3)3·9H2O as precursor, urea as precipitant agent and sulfate K2SO4, (NH4)2SO4, or KAl(SO4)2·12H2O as additive, followed by a calcination step. The samples were further characterized by thermogravimetric analysis, scanning electron microscope, x-ray powder diffraction, nitrogen adsorption, and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of adsorbed CO etc. The morphology of alumina products was strongly dependent on the presence of SO4 2?. Then via a deposition–precipitation method, 3?wt.% Au nanoparticles supported on γ-Al2O3 hollow microspheres exhibit excellent performance with a complete CO conversion at 0?°C (T 100%?=?0?°C) and 50?% conversion at ?25?°C (T 50%?=??25?°C). The good catalytic activity is associated with the special hollow microsphere structures assembled by nanoflakes of γ-Al2O3 support. The DRIFTS confirms the presence of Auδ+ and Au0 on the surface of γ-Al2O3 hollow microspheres. As a contrast, Au catalyst prepared using alumina support with undefined morphology shows low activity under the same catalytic test conditions (T 100%?=?190?°C, T 50%?=?80?°C).

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来源期刊
Gold Bulletin
Gold Bulletin 工程技术-材料科学:综合
CiteScore
3.30
自引率
4.50%
发文量
0
审稿时长
3 months
期刊介绍: Gold Bulletin is the premier international peer reviewed journal on the latest science, technology and applications of gold. It includes papers on the latest research advances, state-of-the-art reviews, conference reports, book reviews and highlights of patents and scientific literature. Gold Bulletin does not publish manuscripts covering the snthesis of Gold nanoparticles in the presence of plant extracts or other nature-derived extracts. Gold Bulletin has been published over 40 years as a multidisciplinary journal read by chemists, physicists, engineers, metallurgists, materials scientists, biotechnologists, surface scientists, and nanotechnologists amongst others, both within industry and academia. Gold Bulletin is published in Association with the World Gold Council.
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