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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。
Based on the seed growth method and proper subsequent processing, the core-shell Ag-Ru and hollow Ru nanoparticles supported on the surface of CeO 2 and γ-Al 2 O 3 support were prepared. The catalytic activity of benzene oxidation showed that the core-shell Ag-Ru nanoparticles had better catalytic activity than the hollow Ru nanoparticles, and the T_ (20) and T_ 90) can be as low as 153.8 ° C and 170.4 ° C, respectively. XPS and H 2 -TPR analysis showed that the presence of Ag in the core-shell Ag-Ru nanoparticles can increase the content of metallic Ru in the shell and inhibit the interaction between the particles and the support, possibly leading to The reason why the core-shell nano-particles have better catalytic activity for benzene oxidation is also given.