کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5357600 | 1503637 | 2015 | 34 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Three-way catalytic performance of Pd/Ce0.67Zr0.33O2-Al2O3 catalysts: Role of the different Pd precursors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Three-way catalytic performance of Pd/Ce0.67Zr0.33O2-Al2O3 catalysts: Role of the different Pd precursors Three-way catalytic performance of Pd/Ce0.67Zr0.33O2-Al2O3 catalysts: Role of the different Pd precursors](/preview/png/5357600.png)
چکیده انگلیسی
Catalytic performance of Pd/Ce0.67Zr0.33O2-Al2O3 catalysts for CO, HC and NOx elimination is greatly influenced by Pd precursors. Pd/CZA(Cl) catalyst prepared with H2PdCl4 as precursor exhibits a good catalytic performance for HC and NO conversion. PdOx species are mainly dispersed on Al2O3 surface with larger PdOx particle size and higher electron density. Residual Cl species in the catalyst could be removed and PdOx species would migrate to (Ce,Zr)xO2-rich gain surface after aging treatment, promoting catalyst thermal stability. While Pd/CZA(NO) and Pd/CZA(NH) catalysts prepared with Pd(NO3)2 or Pd(NH3)4(NO3)2 as precursor promote CO oxidation at low temperature. PdOx species are mainly dispersed on (Ce,Zr)xO2-rich gain surface with smaller Pd particle size and strong Pd-support interaction. Surface chemistry under reaction conditions is revealed by in situ DRIFTS studies. PdOx species dispersed on Al2O3 surface in Pd/CZA(Cl) could be partly reduced during reaction, promoting NO adsorption and dissociation. CO is more easily adsorbed than NO on metallic Pd sites dispersed in (Ce,Zr)xO2-rich gain surface, inhibiting NO conversion for Pd/CZA(NO) and Pd/CZA(NH).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 327, 1 February 2015, Pages 335-343
Journal: Applied Surface Science - Volume 327, 1 February 2015, Pages 335-343
نویسندگان
Siyu Lin, Xue Yang, Linyan Yang, Renxian Zhou,