کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617825 | 49172 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and characterisation of Pt containing NbMCM-41 mesoporous molecular sieves addressed to catalytic NO reduction by hydrocarbons
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Preparation and characterisation of Pt containing NbMCM-41 mesoporous molecular sieves addressed to catalytic NO reduction by hydrocarbons Preparation and characterisation of Pt containing NbMCM-41 mesoporous molecular sieves addressed to catalytic NO reduction by hydrocarbons](/preview/png/9617825.png)
چکیده انگلیسی
Pt and Nb-containing MCM-41 molecular sieves addressed to NO reduction by hydrocarbons were prepared via impregnation of NbMCM-41 with Pt(NH3)4(NO3)2 or H2PtCl6 (1 wt.% of Pt). The physicochemical properties of prepared Pt/NbMCM-41 materials were investigated by XRD, N2 adsorption/desorption isotherms, TEM, H2-TPR and FTIR combined with NO and C3H6 coadsorption and were compared with those of Pt/Nb2O5, Pt/SiMCM-41 and Pt/SiO2 samples. From the results, the presence of niobium in the mesoporous matrix (NbMCM-41) affects the properties of platinum species formed. Smaller particle sizes of Pt-clusters after reduction and reducibility of Pt species at lower temperature is obtained on NbMCM-41 in comparison with the other supports applied in this work. Furthermore, the nature of the Pt-source (cationic complex or acid used for the impregnation) influences the morphology of the final material as well as catalytic activity of the Pt species. Pt/NbMCM-41 would be an attractive material for SCR with propene (NSR technology), in which Pt cationic species have been reduced during the reaction simultaneously with NO oxidation to NO2. NbOâ species present in NbMCM-41 enhances the oxidative activity in the NO â NO2 step and plays the role of storage for nitrate/nitrite species, whereas metallic platinum species is responsible for hydrocarbon activation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 78, Issues 2â3, 1 March 2005, Pages 103-116
Journal: Microporous and Mesoporous Materials - Volume 78, Issues 2â3, 1 March 2005, Pages 103-116
نویسندگان
Izabela Sobczak, Maria Ziolek, Monika Nowacka,