کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5448662 1511941 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Promotional effect of alkyl acids on thermal stability of nanostructured CeO2-ZrO2-Y2O3-La2O3 and its application in automotive three-way catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Promotional effect of alkyl acids on thermal stability of nanostructured CeO2-ZrO2-Y2O3-La2O3 and its application in automotive three-way catalysts
چکیده انگلیسی


- Alkyl acids assisted co-precipitation is employed to synthesize CeO2-ZrO2-La2O3-Y2O3.
- Better properties are obtained in CZ-C12 compared with the commercial material SO-2.
- The supported Rh/CZ-C12 shows higher three-way catalytic activity than Rh/SO-2.

A series of nanostructured CeO2-ZrO2-Y2O3-La2O3 quaternary solid solutions (CZ-C10, CZ-C12, CZ-C14 and CZ-C16) were synthesized by simultaneous co-precipitation method with the assistance of alkyl acids CnH2n+1COOH (n = 9, 11, 13 and 15). The obtained materials exhibit greatly enhanced oxygen storage capacity, textural properties and thermal stability. After aging at 1000 °C, CZ-C12-a presents a high surface area of 47 m2 g−1 and a large cumulative pore volume of 0.28 mL g−1. A comparison between CZ-C12 and the commercial material SO-2 in terms of the catalytic performance of supported Rh-only three-way catalysts indicates that Rh/CZ-C12 owns significantly higher catalytic activity than Rh/SO-2. After aging at 1050 °C for 12 h, the light-off temperatures (T50) of C3H8, CO and NO for Rh/CZ-C12-a are 314 °C, 263 °C and 322 °C, respectively, which are much lower than those (360 °C, 290 °C and 386 °C) for Rh/SO-2-a.

Alkyl acids CnH2n+1COOH (n = 9, 11, 13 and 15) are applied to synthesize highly thermal stable nanostructured CeO2-ZrO2-Y2O3-La2O3 quaternary solid solutions. The results indicate that the dodecanoic acid assisted material CZ-C12 exhibits better properties than the commercial material SO-2 provided by Rhodia. The investigation of supported Rh-only three-way catalysts for gasoline engine exhaust purification show that Rh/CZ-C12 presents higher catalytic activity and better thermal stability with respect to Rh/SO-2.170

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 225, November 2017, Pages 10-19
نویسندگان
, , , , , , ,