کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4756789 1419158 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Gold nanoparticles confined in ordered mesopores: Size effect and enhanced stability during gas-phase selective oxidation of cyclohexanol
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Gold nanoparticles confined in ordered mesopores: Size effect and enhanced stability during gas-phase selective oxidation of cyclohexanol
چکیده انگلیسی


- Mesoporous silica supported gold catalysts show size effect during alcohol oxidation.
- High selectivity is found for gas-phase cyclohexanol to cyclohexanone transformation.
- Gold catalysts exhibit good stability and long lifetime without coke formation.

Gold nanoparticles (AuNPs) encapsulated in the extra-large spherical cages of ordered mesoporous silica EP-FDU-12 with controlled and narrow size distributions have been investigated for the gas-phase oxidation of cyclohexanol. The size effect of AuNPs was demonstrated that the highest TOF for oxidation of cyclohexanol was 939 h−1 at 230 °C when the resulting particle size was in the range of 5-6 nm. The smaller or larger AuNPs ranging from 3.3 to 14.2 nm led to poor catalytic performances in the cyclohexanol oxidation. Importantly, AuNPs loaded in EP-FDU-12 catalyst exhibited remarkably long lifetime (>550 h) without obvious mass-specific activity decrease and poisonous coke formation, which will light the path for the large-scale industrialization of fine chemicals over noble metal catalysts.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 298, 1 December 2017, Pages 269-275
نویسندگان
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