Bimetallic Pt/Pd diesel oxidation catalysts

Morlang, Alexander; Neuhausen, U.; Klementiev, Konstantin; Schütze, Frank W.; Miehe, G.; Fueß, H.; Lox, E.S.

doi:10.1016/j.apcatb.2005.03.007

Cited by 141 publications

(58 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Earlier studies have demonstrated there to be some synergetic effects in terms of light-off and thermal stability during the interaction of platinum with palladium [6]- [8]. Results from earlier studies have shown platinum is able to prevent palladium oxidation after it has undergone hydrothermal aging within the exhaust (Morlang et al).…”

Section: Introductionmentioning

confidence: 97%

“…Results from earlier studies have shown platinum is able to prevent palladium oxidation after it has undergone hydrothermal aging within the exhaust (Morlang et al). Besides, Morlang et al [6] and Kaneeda et al [7] reported that the addition of Pd to Pt catalysts prevents the sintering of Pt species. Kim et al found a non-linear relation between Pt:Pd proportion on HC and CO light-off and stability after aging under simulated engine exhaust conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Herreros

Gill

Lefort

et al. 2014

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

The influence of hydrogen over platinum and combined platinum-palladium diesel oxidation catalysts were investigated on the oxidation kinetics of CO, HC and NO. Although H 2 has been reported to have a positive effect on CO and HC oxidation as well as NO 2 formation over platinum catalysts, there is still uncertainty whether this is due to the temperature rise caused by H 2 oxidation or the result of a change in the reaction kinetics of CO, HC and NO oxidation by the production of intermediate species. The results have showed smaller H 2 concentrations are more effective in improving the catalyst light-off temperature as well as promoting NO oxidation over both platinum and platinum-palladium catalysts. It is suggested that these benefits are a result of not only the exothermic reactions which in turn increase the local catalyst temperature but also H 2 increasing the rate of reactions and the species accessibility to the catalyst active sites thus further CO, HC and NO oxidation can occur at lower catalyst temperatures.

show abstract

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Herreros

Gill

Lefort

et al. 2014

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

show abstract

“…In the Pt-Pd catalyst system, it has been reported that the noble metal components, namely, platinum oxide and palladium oxide, were converted to bimetallic particles or Pd-Pt core-shell structured grains by aging after annealing at high temperature, and these particles/ grains were larger than their initial sizes. (22)(23)(24)27) In the Pt, Pd, Au/SnO 2 gas sensor system, the aging and local heat generated from VOC oxidation would induce the grain growth of Pt and Pd. Thus, the VOC sensing properties of the Pt, Pd, Au/SnO 2 system would depend on the dispersibilities of the noble metal particles.…”

Section: Results Of Tpre Analysismentioning

confidence: 99%

Analysis of Recovery Time of Pt-, Pd-, and Au-Loaded SnO2 Sensor Material with Nonanal as Large-Molecular-Weight Volatile Organic Compounds

2016

Sensors and Materials

View full text Add to dashboard Cite

We investigated the recovery times of Pt-, Pd-, and Au-loaded SnO 2 (Pt, Pd, Au/SnO 2 ) semiconductor gas sensors after their exposure to nonanal as large-molecular-weight volatile organic compounds. The sensors were characterized by their response and temperature-programmed reaction (TPRe), and by transmission electron microscopy (TEM) observation. Sensors pretreated by sufficient aging showed good response but poor resistance recovery with nonanal, whereas good resistance recovery was observed with isoprene. The TPRe analysis revealed that aldehyde gas molecules were oxidized to carboxylic acids on the sensors at the sensor working temperature. In sufficiently aged Pt, Pd, and Au/SnO 2 sensors, the loaded Pt, Pd, and Au catalysts were observed to aggregate by TEM. From these results, we suggest different dispersion states of the loaded Pt, Pd, and Au noble metal particles, the mechanism of oxidation and adsorption of nonanal molecules on SnO 2 grain surface, and their relationship to the recovery time after exposure to nonanal.

show abstract

“…[10] For Pt/Pd catalysts the strong influence of the Pd/Pt ratio on the activities has been pointed out. [14,33,34] It has even been argued that calcination in an air atmosphere leads to advantages related to sintering stability, aging, and activity. For the calcined, thermally aged catalysts several research groups postulate an accumulation of Pt inside the cluster and of Pd on the surface that forms PdÀO bonds in an oxidizing atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Total Oxidation of Propane by using Platinum‐Group‐Metal Catalysts Recovered from Fuel‐Cell Recycling

2013

View full text Add to dashboard Cite

Platinum‐group‐metal materials were recovered from fuel cells and studied as catalysts for the total oxidation of propane as model reaction. Therefore a representative number of metal‐foam catalysts containing platinum, palladium, and ruthenium in certain ratios were prepared and investigated. Interestingly, particularly active catalysts were observed with a high fraction of one metal and small amounts of the other two metals. This suggests a principal trend for preparing efficient catalysts using ternary‐precious‐metal systems. For the recycling of fuel‐cell compounds the composition of the material could be varied by the substitution or addition of appropriate amounts of precious metals to achieve the highest performance.

show abstract

Bimetallic Pt/Pd diesel oxidation catalysts

Cited by 141 publications

References 22 publications

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Analysis of Recovery Time of Pt-, Pd-, and Au-Loaded SnO2 Sensor Material with Nonanal as Large-Molecular-Weight Volatile Organic Compounds

Total Oxidation of Propane by using Platinum‐Group‐Metal Catalysts Recovered from Fuel‐Cell Recycling

Contact Info

Product

Resources

About