催化作用
锰
酒精氧化
选择性
酒
傅里叶变换红外光谱
化学
无机化学
红外光谱学
扫描电子显微镜
多相催化
氧气
核化学
材料科学
化学工程
有机化学
工程类
复合材料
作者
Lam Anh Le Viet,Thi Xuan Thi Luu,Tiến Khoa Lê
出处
期刊:Tạp chí Khoa học và Công nghệ: Chuyên san Khoa học Tự nhiên
[Viet Nam National University Ho Chi Minh City]
日期:2020-12-27
卷期号:5 (1): first-first
标识
DOI:10.32508/stdjns.v5i1.942
摘要
In order to synthesize p-hydroxybenzaldehyde from p-hydroxybenzyl alcohol under oxygen atmosphere, we prepared the new heterogeneous catalysts based on manganese oxides by in-situ growth method at different pH values. The crystal structure, phase composition, morphology, and surface groups of catalysts were characterized by powder X-ray diffraction, field emission electron scanning microscopy and Fourier transform infrared spectroscopy. According to the experimental results, the solution pH used for the preparation of the catalysts strongly affected their properties and their catalytic activities. When the pH was increased from 2 to 4, the a-Mn2O3 content increased with the dominant presence of the rod-like particles. The quantity of Mn on the surface also enhanced which might improve the conversion of p-hydroxybenzyl alcohol while maintaining the high selectivity to p-hydroxybenzaldehyde (about 70%). However, when the pH was highr than 4, the quantity of rod-like particles,a-Mn2O3 and surface Mn species decreased which lowered the catalytic activity.
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