کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7832552 | 1503297 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of TiO2-ZrO2 and Isopropanol Catalytic Conversion
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Characterization of TiO2-ZrO2 and Isopropanol Catalytic Conversion Characterization of TiO2-ZrO2 and Isopropanol Catalytic Conversion](/preview/png/7832552.png)
چکیده انگلیسی
A series of TiO2-ZrO2 composite oxides were prepared by a coprecipitation method, and were characterized by N2 adsorption, XRD, TEM, microcalorimetric adsorption of NH3 and CO2, and infrared spectra of ammonia adsorption. In comparison with the single metal oxide, amorphous composite oxides could be observed with mesoporous structure and higher BET surface area (SBET=218 m2·gâ1). Although the initial adsorption heat for all these samples did not vary significantly, composite oxides possessed more Brönsted acid sites than the single oxide. With an increase in the incorporated amount of titania, the number of basic sites on the surface of composite oxides decreased. In the absence of O2, the values of selectivity for propene exceeded 90% for all these catalysts via isopropanol catalytic conversion, revealing that each of the samples had a strong surface acidity. However, in the presence of O2, 70%-85% selectivity for acetone was obtained for TiO2 and ZrO2, suggesting that redox properties were predominant over acidity. Due to the formation of composite oxides, selectivity for propene increased to about 70%, whereas selectivity for acetone decreased to about 30%, indicating that the acidity was enhanced and the redox property was weakened.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Physico-Chimica Sinica - Volume 22, Issue 8, August 2006, Pages 993-998
Journal: Acta Physico-Chimica Sinica - Volume 22, Issue 8, August 2006, Pages 993-998
نویسندگان
Chenghui Han, Binghua Liu, Huiliang Zhang, Jianyi Shen,