Sulfur deactivation of NOx storage catalysts: influence of exposure conditions and noble metal

Amberntsson, Annika; Skoglundh, Magnus; Ljungström, S.; Fridell, Erik

doi:10.1016/s0021-9517(03)00027-7

Cited by 77 publications

(44 citation statements)

References 36 publications

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“…During lean-burn period, sulfur oxides can poison not only the basic storage component but also the support [3][4][5][6][7]. In addition, under rich-burn condition, sulfur can also accumulate on the noble metal component, and then significantly decrease its oxidation ability [8,9]. Recently, a new LNT catalyst Pt/K/TiO 2 -ZrO 2 defined as the third generation of LNT catalyst previously [10,11] has been put forward, using the binary oxides TiO 2 -ZrO 2 as supports.…”

Section: Introductionmentioning

confidence: 99%

Influence of Co or Ce addition on the NOx storage and sulfur-resistance performance of the lean-burn NOx trap catalyst Pt/K/TiO2-ZrO2

Zou

Meng

Tsubaki

et al. 2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Influence of Co or Ce addition on the NOx storage and sulfur-resistance performance of the lean-burn NOx trap catalyst Pt/K/TiO2-ZrO2

Zou

Meng

Tsubaki

et al. 2009

Journal of Hazardous Materials

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“…Although continuing research regarding NOx storage and regeneration steps is providing for a good understanding of LNT performance, the stability of the material against SO 2 poisoning remains a critical issue [2].…”

Section: Introductionmentioning

confidence: 99%

Promotional Effect of CO2 on Desulfation Processes for Pre-Sulfated Pt-BaO/Al2O3 Lean NOx Trap Catalysts

Kim¹,

Kwak²,

Szanyi³

et al. 2009

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A combination of H 2 TPRX, TR-XRD and XPS analysis has been used to investigate the effects of CO 2 on the desulfation of pre-sulfated Pt-BaO/Al 2 O 3 samples. The results demonstrate that the presence of CO 2 promotes the removal of sulfur species, especially at temperatures below 500°C, with a corresponding suppression of BaS formation, thus resulting in a lower amount of residual sulfur on the sample after desulfation.

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“…During lean-burn period, sulfur oxides can poison both the basic storage component and the support [3][4][5][6][7]. In addition, under rich-burn condition, sulfur can also accumulate on the noble metal component, and consequently decrease its oxidation ability [8,9]. The addition of the transition metal to the LNT catalysts seems to be a way to improve the sulfur tolerance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Al2O3 Doping into TiO2–ZrO2 on the Storage and Sulfur-resistance Performance of the NO x Trap Catalyst Pt/K/TiO2–ZrO2

et al. 2008

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A series of lean-burn NO x trap (LNT) catalyst Pt/K/Al 2 O 3 -TiO 2 -ZrO 2 were prepared by sequential impregnation with the support synthesized by coprecipitation. The effect of Al 2 O 3 doping into TiO 2 -ZrO 2 on the storage and sulfur-resistance performance of the catalyst Pt/K/TiO 2 -ZrO 2 was investigated carefully. In situ DRIFTS spectra show that the NO x is mainly stored as nitrate at the optimal temperature of *350°C. The NO x storage capacity (NSC) of Pt/K/TiO 2 -ZrO 2 was greatly improved by Al 2 O 3 doping due to the remarkably increased specific surface area and the decreased Ti content. The results of sulfation and regeneration by H 2 -TPR reveal that the sulfur on Al 2 O 3 -TiO 2 -ZrO 2 supported catalysts is easier to be removed, making them possess much better sulfur-resisting ability than TiO 2 -ZrO 2 or Al 2 O 3 supported ones. The NSC recovery efficiency of Al 2 O 3 -TiO 2 -ZrO 2 supported catalysts can reach as high as 81-96% while only 30.4 and 62.5% were achieved for the catalysts supported on pure Al 2 O 3 and TiO 2 -ZrO 2 , respectively. The doped catalyst with the Al/(Ti ? Zr) atomic ratio of 3:1 always shows the highest NSC before or after sulfation-regeneration.

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Sulfur deactivation of NOx storage catalysts: influence of exposure conditions and noble metal

Cited by 77 publications

References 36 publications

Influence of Co or Ce addition on the NOx storage and sulfur-resistance performance of the lean-burn NOx trap catalyst Pt/K/TiO2-ZrO2

Influence of Co or Ce addition on the NOx storage and sulfur-resistance performance of the lean-burn NOx trap catalyst Pt/K/TiO2-ZrO2

Promotional Effect of CO2 on Desulfation Processes for Pre-Sulfated Pt-BaO/Al2O3 Lean NOx Trap Catalysts

The Effect of Al2O3 Doping into TiO2–ZrO2 on the Storage and Sulfur-resistance Performance of the NO x Trap Catalyst Pt/K/TiO2–ZrO2

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