文献类型：期刊文献

中文题名：超小Ag纳米粒子的控制制备及其丙烯气相环氧化性能

英文题名：Synthesis of Ultra-Small Ag Nanoparticles and Their Catalytic Performance for Epoxidation of Propylene

作者：束远[1];郭昕[1];王丽[1];郭杨龙[1];郭耘[1];詹望成[1]

机构：[1]华东理工大学工业催化研究所,上海200237

年份：2019

卷号：43

期号：3

起止页码：225

中文期刊名：稀有金属

外文期刊名：Chinese Journal of Rare Metals

收录：CSTPCD;;EI(收录号：20192507080093);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：上海市浦江人才计划项目(17PJD012)资助

语种：中文

中文关键词：Ag纳米粒子;颗粒大小;两步焙烧法;丙烯;选择性氧化

外文关键词：Ag nanoparticles;particle size;two-step calcination;propylene;selective oxidation

摘要：负载型金属催化剂的性能与金属纳米粒子的粒径密切相关,但目前传统合成方法还无法高效地合成颗粒尺寸为1～3 nm的超小金属纳米粒子。以Ag纳米粒子为研究模型,在油胺体系中,采用改进的"降温法"制备得到尺寸分布在1～3 nm范围内的超小Ag纳米粒子。在此基础上,将所合成的超小Ag纳米粒子和尺寸在10 nm的Ag纳米粒子分别负载到经油酸改性的碳酸钡载体上,并经"两步焙烧法"制备了负载不同尺寸Ag纳米粒子的Ag/BaCO_3催化剂(分别标记为Ag-BaCO_3~#-10 nm和Ag-BaCO_3~#-3 nm)。同时,研究了两种催化剂在丙烯气相环氧化反应中的性能。结果表明相比于Ag-BaCO_3~#-10 nm催化剂, Ag-BaCO_3~#-3 nm表现出更好的催化活性,在较低温度下具有更高的丙烯转化率和环氧丙烷选择性。在150℃时其催化性能达到最佳,具有88.2%的PO选择性和0.8%的丙烯转化率。
The catalytic performance of supported metal catalysts is closely related to the particle size of metal nanoparticles.However,the traditional synthesis methods could not efficiently synthesize ultra-small metal nanoparticles with particle size of 1~3 nm.In this paper,using Ag nanoparticles as the model,the ultra-small Ag nanoparticles(1~3 nm)were prepared by the“cooling method”under the oleylamine system.Meanwhile,Ag nanoparticles with particle size of 10 nm were also synthesized as reference sample.On this basis,the synthesized ultra-small and 10 nm Ag nanoparticles were supported on barium carbonate modified by oleic acid,respectively.After the samples were calcined by“two-step calcination”method,the obtained corresponding catalysts were labeled with Ag-BaCO^#-10 nm and Ag-BaCO3^#-3 nm,respectively.The results showed that the catalytic activity of the Ag-BaCO3^#-3 nm catalyst was higher than that of Ag-BaCO3^#-10 nm catalyst.At 150℃,the Ag-BaCO3^#-3 nm catalyst exhibited the best catalytic activity with 88.2%PO selectivity and 0.8%propylene conversion.