Citation: Hongyan Shang, Yun Wang, Yajuan Cui, Ruimei Fang, Wei Hu, Maochu Gong, Yaoqiang Chen. Catalytic performance of Pt-Rh/CeZrYLa+LaAl with stoichiometric natural gas vehicles emissions[J]. Chinese Journal of Catalysis, ;2015, 36(3): 290-298. doi: 10.1016/S1872-2067(14)60270-9 shu

Catalytic performance of Pt-Rh/CeZrYLa+LaAl with stoichiometric natural gas vehicles emissions

Hongyan Shang ^a ,
Yun Wang ^b ,
Yajuan Cui ^c ,
Ruimei Fang ^a ,
Wei Hu ^a ,
Maochu Gong ^d ,
Yaoqiang Chen ^a,c,d,,

1.
a College of Chemical Engineering, Sichuan University, Chengdu 610065, Sichun, China;

Corresponding author: Yaoqiang Chen,
Received Date: 19 October 2014
Available Online: 12 December 2014
Fund Project: 国家自然科学基金(21173153) (21173153) 四川省科技厅科技支撑项目(2011GZ0035). (2011GZ0035)

The composite support CeZrYLa+LaAl was prepared by a co-precipitation method, and Pt-Rh bimetallic catalysts were fabricated on this support using different preparation procedures. The catalytic activities of these materials were tested in a gas mixture simulating the exhaust from a stoichiometric natural gas vehicle. The as-prepared catalysts were also characterized by X-ray photoelectron spectroscopy, X-ray diffraction, N₂ adsorption-desorption and H₂-temperature-programmed reduction. It was found that the order of activities for CH₄, CO and NO conversion was Cat3 ≈ Cat2 > Cat1, where Cat3 had the lowest light-off temperature (T₅₀) for CO (114 ℃) and NO (149 ℃), the lowest complete conversion temperature (T₉₀) for CH₄ (398 ℃) and CO (179 ℃), and the lowest ΔT (T₉₀-T₅₀) for CH₄ (34 ℃) and CO (65 ℃). Cat2 showed the lowest T₅₀ for CH₄ (342 ℃), the lowest T₉₀ for NO (174 ℃), and the lowest ΔT for NO (17 ℃). Cat1 had the highest T₅₀ and T₉₀ and the largest ΔT out of all three catalysts. Indicating that Pt-Rh bimetallic catalysts (Cat2 and Cat3) prepared by physically mixing Pt and Rh powders exhibited much better catalytic activity than those (Cat1) prepared by co-impregnation, since homogeneous Pt and Rh sites made a significant contribution to CH₄/CO/NO conversions. In contrast, strong Pt-Rh interactions in the co-impregnation materials affected the oxidation states of Pt, and the Pt-enriched surface blocked active Rh sites. Moreover, Cat3 was prepared by adding additives (La³⁺, Zr⁴⁺ and Ba²⁺) into the physically mixed Pt-Rh catalysts. XRD results demonstrated that the additive cation (Zr⁴⁺) was incorporated into the CeO₂-ZrO₂ lattice, thus creating a higher concentration of defects and improving the O₂-mobility. XPS results showed that the Cat3 had the highest Ce³⁺/Ce ratio, suggesting the presence of a significant quantity of oxygen vacancies and cerium in the Ce³⁺ state. All of these further promoted the three-way catalytic activity and widened the air-to-fuel working-window.
- Platium-rhodium,
- Nanocomposite CeZrYLa+LaAl,
- La-Zr-Ba additive,
- Stoichiometric natural gas vehicle,
- Exhaust purification
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