On the nature of active gold species in zeolites in CO oxidation

A. Simakov, I. Tuzovskaya, A. Pestryakov, N. Bogdanchikova, V. Gurin, M. Avalos, M. H. Farías

Результат исследований: Материалы для журналаСтатья

43 Цитирования (Scopus)

Аннотация

It was disclosed for Au/zeolites that not one, but several active sites can be reactive in CO oxidation on the same catalyst. Au3+ cationic species do not show the activity under studied conditions. Gold nanoparticles (1.5-5 nm) are characterized by activity at high temperature. Gold clusters display activity in low-temperature region, but only after sample pretreatment in He at 500 °C. Nanoparticle active sites are stable during reaction, in contrast with cluster active sites. The last ones lost activity probably due to complete oxidation and can be reactivated by He treatment. This investigation revealed that clusters are the most active, but not stable and are easily oxidized by oxygen, while stable nanoparticles are less active.

Язык оригиналаАнглийский
Страницы (с-по)121-128
Число страниц8
ЖурналApplied Catalysis A: General
Том331
Номер выпуска1
DOI
СостояниеОпубликовано - 2007

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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  • Цитировать

    Simakov, A., Tuzovskaya, I., Pestryakov, A., Bogdanchikova, N., Gurin, V., Avalos, M., & Farías, M. H. (2007). On the nature of active gold species in zeolites in CO oxidation. Applied Catalysis A: General, 331(1), 121-128. https://doi.org/10.1016/j.apcata.2007.07.039