Improved sulfur-resistant ability on CO oxidation of Pd/Ce0.75Zr0.25O2 over Pd/CeO2-TiO2 and Pd/CeO2

Shen, Meiqing; Lin, Fang; Wei, Guangxi; Wang, Jianqiang; Zhu, Shaochun

doi:10.1016/s1002-0721(14)60383-5

Cited by 16 publications

(4 citation statements)

References 21 publications

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“…In addition to the size effect of Pt particles, the sulfates either through loading of SO 4 2– or presulfation could significantly promote the reactivity of Pt/Al 2 O 3 or Pt/Ce–Zr toward oxidation of HCs (especially propane and propylene), CO, and NO as a result of increased acidity. ,,,,,,− For example, the loading of 10 wt %SO 4 2– on Pt/Ce–Zr enables a 75 °C decrease of T 90 of the oxidation of propylene and CO relative to the fresh catalyst. Moreover, the conversion of Pt/Ce–Zr-10 wt %SO 4 2– exceeds 95% at 240 °C even after 0.02% SO 2 poisoning for 20 h in simulated diesel exhaust stream .…”

Section: Impact Of So2 On Docsmentioning

confidence: 99%

A Review on the Impact of SO₂ on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

et al. 2021

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A high-efficiency after-treatment technology has been required to meet the increasingly stringent regulations on the emissions of nitrogen oxides (NO x ), hydrocarbons (HCs), and carbon monoxide (CO) exhausts from diesel engine vehicles throughout the world. The diesel oxidation catalyst (DOC) is an indispensable part of a diesel-fueled exhaust system, which mainly functions in the oxidation of unburned HCs and CO to CO2 and H2O (in the case of HCs) and a proportion of NO to NO2. However, the DOC will unavoidably be poisoned by trace gaseous SO2 or accumulated sulfur on the catalyst under real operational conditions and hence impair the overall purification efficiency of the aftertreatment system. There have been significant research efforts from both academia and industry involving sulfur-relevant diesel oxidation chemistry and development of robust sulfur-resistant oxidation catalysts. This Review focuses on recent advances in the study of SO2 effects on the catalytic oxidation of NO, HCs, and CO over DOCs, with particular attention to the fundamentals beneath apparent observations of sulfur influence on PGM-based and non-noble metal-based catalysts in the different oxidation reactions. Regeneration methods and design rationale for sulfur-resistant catalysts are also covered. Several challenges in the future research regarding microscopic insights into the SO2-influencing mechanism and next-generation sulfur-resistant DOC design are highlighted toward real-world practice.

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Section: Impact Of So2 On Docsmentioning

confidence: 99%

A Review on the Impact of SO₂ on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

et al. 2021

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“…The chemical deactivation of TWCs was mostly caused by a high content of lead and sulfur in fuel [25,26]. Among the mentioned noble metals, palladium is affected by sulfur more significantly [27]. However, up to now, an increase in fuel quality reflected in lowered sulfur content allowed palladium to become the main component of TWCs [10].…”

Section: Introductionmentioning

confidence: 99%

Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

et al. 2023

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Pd/Al2O3 catalyst of the “crust” type with Pd loading of 0.03 wt.% was prepared by the deposition of 2 nm Pd particles on the outer surface of the alumina support using laser electrodispersion (LED). This technique differs from a standard laser ablation into a liquid in that the formation of monodisperse nanoparticles occurs in the laser torch plasma in a vacuum. As is found, the LED-prepared catalyst surpasses Pd-containing three-way catalysts, obtained by conventional chemical synthesis, in activity and stability in CO oxidation under prompt thermal aging conditions. Thus, the LED-prepared Pd/Al2O3 catalyst showed the best thermal stability up to 1000 °C. The present research is focused on the study of the high-temperature evolution of the Pd/Al2O3 catalyst in two reaction mixtures by a set of physicochemical methods (transmission electron microscopy, X-ray photoelectron spectroscopy, and diffuse reflectance UV-vis spectroscopy). In order to follow the dispersion of the Pd nanoparticles during the thermal aging procedure, the testing reaction of ethane hydrogenolysis was also applied. The possible reasons for the high stability of LED-prepared catalysts are suggested.

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“…In addition, the introduction of Zr can also promote the dispersion of noble metals on the surface of the catalyst and the sulfur resistance of the catalyst. [ 160 ] Naoto et al [ 161 ] found that compared with Pt/Al 2 O 3 , the Pt particles on the Pt/CeZr catalyst are highly dispersed on the surface of the CeZr catalyst, and the addition of Zr increases the OSC of the catalyst. The highly dispersed Pt and the OSC of CeZr jointly promote the CO oxidation of the catalyst.…”

Section: Introducing a Dopant Into Ceo2mentioning

confidence: 99%

“…The highly dispersed Pt and the OSC of CeZr jointly promote the CO oxidation of the catalyst. Shen et al [ 160 ] prepared a Pd/Ce 0.75 Zr 0.25 O 2 catalyst. They found that after 10 h of SO 2 treatment, compared with Pd/CeO 2 –TiO 2 and Pd/CeO 2 , Pd/Ce 0.75 Zr 0.25 O 2 showed better resistance to sulfur poisoning.…”

Section: Introducing a Dopant Into Ceo2mentioning

confidence: 99%

Recent Advances of Ceria‐Based Materials in the Oxidation of Carbon Monoxide

et al. 2020

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Carbon monoxide (CO) is a toxic and harmful gas pollutant. The realization of low‐temperature CO oxidation has been the focus of research. Also, CO oxidation as a typical model reaction is conducive to the in‐depth study of the catalytic reaction mechanism. Due to its unique oxygen storage/release capacity (OSC) and the easy transition between Ce3+ and Ce4+, CeO2 is widely used as a catalyst and catalyst support in many important reactions, especially the low‐temperature CO oxidation reaction. Herein, the application of cerium‐based materials in low‐temperature CO oxidation and CeO2 activity enhancement strategies in recent years are elaborated upon, including metal loading, adjustment of exposed facets of CeO2, and metal doping, through metal‐support interaction and the generation of oxygen vacancies on the CeO2 surface to improve the CO oxidation activity of cerium‐based catalysts. At the end of the review, the synthesis of Ce‐based materials and their applications and challenges in the field of CO oxidation are looked at.

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Improved sulfur-resistant ability on CO oxidation of Pd/Ce0.75Zr0.25O2 over Pd/CeO2-TiO2 and Pd/CeO2

Cited by 16 publications

References 21 publications

A Review on the Impact of SO₂ on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

A Review on the Impact of SO₂ on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

Recent Advances of Ceria‐Based Materials in the Oxidation of Carbon Monoxide

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Improved sulfur-resistant ability on CO oxidation of Pd/Ce0.75Zr0.25O2 over Pd/CeO2-TiO2 and Pd/CeO2

Cited by 16 publications

References 21 publications

A Review on the Impact of SO2 on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

A Review on the Impact of SO2 on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

Recent Advances of Ceria‐Based Materials in the Oxidation of Carbon Monoxide

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A Review on the Impact of SO₂ on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis

A Review on the Impact of SO₂ on the Oxidation of NO, Hydrocarbons, and CO in Diesel Emission Control Catalysis