摘要
基于种子生长法并施加适当的后续处理,制备了负载于CeO_2和γ-Al_2O_3载体表面的核壳结构Ag-Ru和中空Ru纳米颗粒。对苯催化氧化活性测试表明,核壳结构Ag-Ru纳米颗粒比中空Ru纳米颗粒具有更好的催化活性,其中负载于CeO_2表面的核壳结构Ag-Ru纳米颗粒的T_(20)和T_(90)可分别低至153.8℃和170.4℃。XPS和H_2-TPR分析均表明在核壳结构Ag-Ru纳米颗粒中,内核Ag的存在可增加壳层组分中金属态Ru的含量,并且可抑制颗粒与载体间的相互作用,可能是导致核壳结构纳米颗粒具有较好苯催化氧化活性的原因。
CeO2 and ,γ-Al2O3 -supported core-shell Ag-Ru and hollow Ru nanoparticles are prepared by a seed-mediated growth method and an appropriate post-treatment. The catalytic tests of benzene oxidation show that the core-shell Ag- Ru nanoparticles have better activities than those of hollow Ru nanostructures. In specific, the core-shell Ag-Ru nanoparticles supported on CeO2 substrates have T20 and T90 as low as 153.8 ℃ and 170. 4 ℃, respectively. The XPS and H2- TPR analyses confirm that the core-shell Ag-Ru nanoparticles have more metallic Ru component in their particle surface, which may account for the high performance for oxidation of benzene.
作者
潘金鼎
李佳琪
冯艳
陈运法
杨军
PANG Jin-ding LI Jia-qi FENG Yan CHEN Yun-fa YANG Jun(State Key Laboratory of Multi-Phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China University of Chinese Academy of Sciences, Beijing 100049, China)
出处
《山东大学学报（理学版）》
CAS
CSCD
北大核心
2017年第5期18-24,共7页
Journal of Shandong University(Natural Science)
基金
国家自然科学基金资助项目(21376247
21573240)
国家高技术研究发展计划(863计划)资助项目(2012AA062702)
中国科学院先导专项资助项目(XDB05050300)
中国科学院知识创新工程资助项目(KZCX2-EW-403)
关键词
种子生长法
钌纳米颗粒
核壳结构
中空结构
苯
催化氧化
seed-mediated growth
Ru nanoparticles
core-shell
hollow
benzene
catalytic oxidation
