In situ FTIR study of SO2 interaction with Pt/BaCO3/Al2O3 NOx storage catalysts under lean and rich conditions

Abdulhamid, Hussam; Fridell, Erik; Dawody, Jazaer; Skoglundh, Magnus

doi:10.1016/j.jcat.2006.04.034

Cited by 97 publications

(58 citation statements)

References 33 publications

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“…O 2 coadsorption on the fresh LNT catalysts at 400°C for 30 min. The band at 1,143 cm -1 related to sulfate [7,12,19,20] can be clearly observed for the sample Pt/K/TZ. After doping Al 2 O 3 into TiO 2 -ZrO 2 support, this peak shifts to 1,200 cm -1 and it shifts to 1,215 cm -1 for the pure Al 2 O 3 supported sample.…”

Section: In Situ Drifts Of No and O 2 Co-adsorptionmentioning

confidence: 86%

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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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Section: In Situ Drifts Of No and O 2 Co-adsorptionmentioning

confidence: 86%

“…5. The small shoulder band at 1,300 cm -1 for Pt/K/Al 2 O 3 suggests the existence of a small quantity of surface Al 2 (SO 4 ) 3 [20]. In Al 2 O 3 doped samples, the existence of trace Al 2 (SO 4 ) 3 is also potential, whose band may be covered by that of K 2 SO 4 .…”

Section: In Situ Drifts Of No and O 2 Co-adsorptionmentioning

confidence: 94%

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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“…3b, Ba sulfate bands started to appear in the region 1,250-1,000 cm -1 at a much earlier stage than in the absence of H 2 O, i.e., after *2 min of exposure. An additional band at 978 cm -1 can be ascribed to Al sulfite [34]. In addition, the presence of Al sulfate cannot be excluded, given that the expected bands at 1,350 and 1,040 cm -1 would overlap with the nitrate bands at 1,320 and 1,039 cm -1 .…”

Section: Pbamentioning

confidence: 99%

“…In the absence of H 2 O, the spectra of PBA at short exposure times featured bands at 1,418, 1,323 and 1,039 cm -1 , corresponding to Ba nitrate species [4,32]. With increased exposure time, a new broad band appeared at 1,130 cm -1 which became progressively stronger; this can be attributed to Ba sulfate [4,33,34]. After 30 min of exposure, nitrate bands were still observable.…”

Section: Pbamentioning

confidence: 99%

“…The promoting effect of H 2 O addition on sulfation has been reported previously. Using IR spectroscopy, Abdulhamid et al [34] observed increased formation of bulk Ba sulfate in a Ba-based LNT catalyst when H 2 O was added to the SO 2 /O 2 feed. In this study, it was difficult to distinguish the relative amounts of bulk and surface sulfate formed since the main sulfate band was very broad.…”

Section: Pbacmentioning

confidence: 99%

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Effect of Ceria on the Sulfation and Desulfation Characteristics of a Model Lean NO x Trap Catalyst

Toops

Crocker

2008

Catal Lett

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The effect of ceria addition on the sulfation and desulfation characteristics of a model Ba-based lean NO x trap (LNT) catalyst was studied. According to DRIFTS and NO x storage capacity measurements, ceria is able to store sulfur during catalyst exposure to SO 2 , thereby helping to limit sulfation of the main (Ba) NO x storage phase and maintain NO x storage capacity. Temperature programmed desulfation experiments revealed that desulfation of a model ceria-containing catalyst occurred in two stages, corresponding to sulfur elimination from the ceria phase at *450°C, followed by sulfur loss from the Ba phase at *650°C. Significantly, the ceria-containing catalyst displayed relatively lower sulfur evolution from the Ba phase than its non-ceria analog, confirming that the presence of ceria lessened the degree of sulfur accumulation on the Ba phase.

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PtM/Ba/Al₂O₃Ce_0.6Zr_0.4O₂: Influence of Synergetic Interactions between Transition Metal and Platinum on NO_x Storage and Reduction

Chen

Wang

2014

ChemPlusChem

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PtM/Ba/ACZ (M=Mn, Fe, and Co) and Pt/Ba/ACZ were prepared using Al2O3Ce0.6Zr0.4O2 (ACZ) as a support. XRD analysis shows Ce0.6Zr0.4O2 solid solution was formed in the ACZ support, and M addition results in a slight shift of the characteristic peaks of Ce0.6Zr0.4O2 to higher 2θ value. A strong interaction between Pt and the transition metals was confirmed by X‐ray absorption fine structure experiments. The effects of transition‐metal addition on NOx storage and reduction, sulfur resistance, and regeneration of PtM/Ba/ACZ were explored. In general, the addition of Co is favorable for NOx storage and reduction, and the addition of Co and Fe facilitates sulfur desorption and regeneration of sulfated samples. Interestingly, if the Pt content is lowered from 1.0 wt % in Pt/Ba/ACZ to 0.5 wt % in PtCo/Ba/ACZ, higher NOx storage capacity and comparable reduction properties are demonstrated.

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In situ FTIR study of SO2 interaction with Pt/BaCO3/Al2O3 NOx storage catalysts under lean and rich conditions

Cited by 97 publications

References 33 publications

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

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

Effect of Ceria on the Sulfation and Desulfation Characteristics of a Model Lean NO x Trap Catalyst

PtM/Ba/Al₂O₃Ce_0.6Zr_0.4O₂: Influence of Synergetic Interactions between Transition Metal and Platinum on NO_x Storage and Reduction

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In situ FTIR study of SO2 interaction with Pt/BaCO3/Al2O3 NOx storage catalysts under lean and rich conditions

Cited by 97 publications

References 33 publications

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

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

Effect of Ceria on the Sulfation and Desulfation Characteristics of a Model Lean NO x Trap Catalyst

PtM/Ba/Al2O3Ce0.6Zr0.4O2: Influence of Synergetic Interactions between Transition Metal and Platinum on NOx Storage and Reduction

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PtM/Ba/Al₂O₃Ce_0.6Zr_0.4O₂: Influence of Synergetic Interactions between Transition Metal and Platinum on NO_x Storage and Reduction