کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
580740 | 1453156 | 2009 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of calcination temperature on the performance of Pd-Mn/SiO2-Al2O3 catalysts for ozone decomposition
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
The catalytic decomposition of ozone was investigated over Pd-Mn/SiO2-Al2O3 catalysts in the ground air. The catalysts were prepared by incipient wetness impregnation method and characterized by powder X-ray diffraction (XRD), thermo gravimetric (TG) analysis, and N2 adsorption/desorption measurements (Brunauer-Emmet-Teller method). The influence of calcination temperature on the catalytic activities, and the lifetime test of the catalyst pretreated at 350 °C had been studied. XRD and TG results show that when calcined in the temperature range of 300-450 °C, manganese carbonate (MnCO3) is partly decomposed to MnOx (x = 1.6-2.0) species in the catalysts. However, when calcined at 500 °C, MnOx partly turns into Mn2O3 in the catalyst. The catalytic activity test indicates that the catalysts calcined at 300-400 °C exhibit the best performance for O3 decomposition, and the completely conversion temperature of ozone (T100) is in the region of 30-35 °C, which is lower than surface temperature of water tanks of running automobile. Under gas hour space velocity (GHSV) of 635,000 hâ1 and reaction temperature of 40 °C, after lifetime test for 80 h, the catalyst calcined at 350 °C keeps 90% conversion, which indicates that they have excellent ability to resist deactivation. The catalysts calcined at 300-400 °C show great potential to be applied at lower temperature, especially in winter and at the stage of automobile engine cold start.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 172, Issues 2â3, 30 December 2009, Pages 631-634
Journal: Journal of Hazardous Materials - Volume 172, Issues 2â3, 30 December 2009, Pages 631-634
نویسندگان
Quanwei Yu, Hao Pan, Ming Zhao, Zhimin Liu, Jianli Wang, Yaoqiang Chen, Maochu Gong,