Pt–Ru/Ba/Al 2 O 3 –Ce 0.33 Zr 0.67 O 2 : An effective catalyst for NO x storage and reduction

Chen, Zhilin; Wang, Xiuyun; Wang, Yuling; Wang, Ruihu

doi:10.1016/j.molcata.2014.09.022

Cited by 8 publications

(1 citation statement)

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“…Association with Pt could make Ru more stable. Chen et al 108 have shown that the catalyst Pt-Ru/Ba/Al2O3-Ce0.33Zr0.67O2 would have very good NSR performances. NOx storage capacity is rather lower than on the Pt-only catalyst but the NOx reduction activity is significantly higher, which leads to better performances in cycling regimes.…”

Section: Nsr Materials With Other Noble Metalsmentioning

confidence: 99%

Chapter 3. NSR Catalytic Materials

Can¹,

Courtois²,

Duprez³

2018

Catalysis Series

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Imagined in the 90's, the NOx-storage and reduction (NSR) process operates with alternative cycles of long lean phases (NOx storage) and short rich phases (NOx reduction). NSR catalysts should possess at least two components: a basic oxide for trapping the NOx and a metallic component for the NO oxidation and the reduction of stored NOx. The reference material is composed of barium oxide (10-20 wt-%) deposited on a Pt/Al2O3 (1-2 % Pt). Improvements of NSR catalysts were obtained by changing (i) the basic component (especially potassium but it can also damage the catalyst substrate; other alkaline or alkaline-earth oxides were also envisaged); (ii) the support (especially cerium-based supports, or titania, hydrotalcites, perovskites); (iii) the metal (Rh is often added to improve the NOx reduction, and combinations of precious metals are considered). Noble metal-free catalysts were also developed, mainly based on cobalt, copper or manganese oxides. Perovskites including these transition metal oxides and potassium are also interesting for NSR applications. However, complete replacement of noble metal catalysts cannot be feasible yet. Usual NSR catalysts are sensitive to aging (sintering; strong of Ba-support interactions) and to sulphur poisoning but supports like TiO2 or cerium-based oxides can protect the catalyst from stable sulphate adsorption.

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Section: Nsr Materials With Other Noble Metalsmentioning

confidence: 99%