ZnO nanoparticles: An efficient catalyst for transesterification reaction of α-keto carboxylic esters
作者:Mohamed M.A. Soliman、Anirban Karmakar、Elisabete C.B.A. Alegria、Ana P.C. Ribeir、Guilherme M.D.M. Rúbio、Marta S. Saraiva、M. Fátima C. Guedes da Silva、Armando J.L. Pombeiro
DOI:10.1016/j.cattod.2019.08.053
日期:2020.5
hexagonal wurtzite phase with high purity and SEM-EDS analysis confirm the purity and a homogenous distribution of the nanostructures. The ZnO nanostructures present plate-like agglomerates, resulting in a quasi-spherical morphology. The catalytic activity of the formed ZnO nanoparticles was evaluated towards the transesterification reaction of different carboxylic esters in the presence of various alcohols
在室温下,使用硝酸锌和氢氧化钠在水性介质中通过可持续沉淀法合成纯ZnO纳米颗粒。它们的特征在于X射线衍射(XRD),扫描电子显微镜(SEM-EDX),热重分析(TGA),傅里叶变换红外光谱(FTIR),紫外可见光谱(UV-vis)光谱和Brunauer-Emmett-柜员(BET)分析。XRD图谱表明具有高纯度的六方纤锌矿相的形成,并且SEM-EDS分析证实了纳米结构的纯度和均匀分布。ZnO纳米结构呈现板状附聚物,导致准球形形态。在各种醇的存在下,评估了所形成的ZnO纳米颗粒对不同羧酸酯的酯交换反应的催化活性。该催化剂对酯的酯交换反应具有高度选择性α酮基羧酸酯(苯甲酰甲酸甲酯)和通向CA。在反应时间内24小时内,产品收率为97%。