Effect of phosphorus poisoning on catalytic activity of diesel exhaust gas catalyst components containing oxide and Pt

Kröger, V.; Hietikko, M.; Angove, Dennys E.; French, David; Lassi, Ulla; Suopanki, Aslak; Laitinen, Riitta; Keiski, Riitta L.

doi:10.1007/s11244-007-0215-x

Cited by 23 publications

(14 citation statements)

References 7 publications

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“…These results support the findings of a previous study, in which a decrease in the catalytic activity of the same samples was detected after the ageings. The changes in the activity were associated with phosphates formed with the catalyst components [10]. …”

Section: Discussionmentioning

confidence: 98%

Characterization of phosphorus poisoning on diesel exhaust gas catalyst components containing oxide and Pt

et al. 2007

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Effects of phosphorus poisoning on the characteristics of powdered exhaust gas catalyst components containing different oxides and platinum were studied. The amount of phosphorus accumulated in the sample during the laboratory-scale ageing procedure varied for the samples with different composition. The phosphorus ageing affected substantially the characteristics of the samples, which could be detected as a decrease in the specific surface area and pore volume and an increase in the average pore size. Large platinum particles and an increase in the washcoat grain-size were observed after the ageings.

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Section: Discussionmentioning

confidence: 98%

Characterization of phosphorus poisoning on diesel exhaust gas catalyst components containing oxide and Pt

et al. 2007

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“…As we aim to demonstrate that catalytic microreactors with hierarchic pore structure can be produced through this method, we need to choose the composition of the metal deposition solution carefully. In this case, the introduction of phosphorous in the reactor should be avoided as phosphorus is a well-known catalyst poison [29]. Instead, a dimethylamine borane system was chosen in order to obtain monoliths with catalyst activity in which the presence of boron enhances resistance of nickel catalyst against poisoning [30].…”

Section: Electroless Depositionmentioning

confidence: 99%

Preparation of Nanostructured Microporous Metal Foams through Flow Induced Electroless Deposition

Akay

Calkan

2015

Journal of Nanomaterials

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Monolithic nanostructured metallic porous structures with a hierarchy of pore size ranging from ca. 10 m to 1 nm are processed for use as microreactors. The technique is based on flow induced electroless deposition of metals on a porous template known as PolyHIPE Polymer. The process is conducted in a purpose built flow reactor using a processing protocol to allow uniform and efficient metal deposition under flow. Nickel chloride and sodium hypophosphite were used as the metal and reducing agent, respectively. Electroless deposition occurs in the form of grains with a composition of Ni P in which the grain size range was ca. 20-0.2 m depending on the composition of the metal deposition solution. Structure formation in the monoliths starts with heat treatment above 600 ∘ C resulting in the formation of a 3-dimensional network of capillary-like porous structures which form the walls of large arterial pores. These monoliths have a dense but porous surface providing mechanical strength for the monolith. The porous capillary-like arterial pore walls provide a large surface area for any catalytic activity. The mechanisms of metal deposition and nanostructure formation are evaluated using scanning electron microscopy, energy dispersive X-ray analysis, XRD, BET-surface area, and mercury intrusion porosimetry.

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“…The platinum crystal growth, washcoat sintering and presence of phosphorus indicated similar deactivating effects in the catalysts. As a result of the phosphorus poisoning, a decrease in the catalytic activity was also observed [15]. Figure 9 shows an example of C 3 H 6 conversion as a function of temperature for the fresh and phosphorus poisoned Ce-Fe-Beta zeolite samples.…”

Section: Discussionmentioning

confidence: 99%

Structural changes in air aged and poisoned diesel catalysts

et al. 2007

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Laboratory-scale ageing and poisoning procedures were performed on selected diesel catalysts. The results showed that phosphorus poisoning together with high temperature ageing has a strong effect on the catalytic activity and microstructure of platinum containing catalysts. Phosphorus poisoning contaminated the catalysts resulting in phosphate formation, e.g. CePO 4 and AlPO 4 . Poisoning and air ageing increased platinum particle-size and washcoat grain-size.

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Effect of phosphorus poisoning on catalytic activity of diesel exhaust gas catalyst components containing oxide and Pt

Cited by 23 publications

References 7 publications

Characterization of phosphorus poisoning on diesel exhaust gas catalyst components containing oxide and Pt

Characterization of phosphorus poisoning on diesel exhaust gas catalyst components containing oxide and Pt

Preparation of Nanostructured Microporous Metal Foams through Flow Induced Electroless Deposition

Structural changes in air aged and poisoned diesel catalysts

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