Temperature-Programmed Reaction Spectroscopy of Ceria- and Cu/Ceria-Supported Oxide Catalyst

Zimmer, P.; Tschöpe, Andreas; Birringer, R.

doi:10.1006/jcat.2001.3461

Cited by 145 publications

(77 citation statements)

References 18 publications

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“…The reduction profiles of xCuCe samples refers to the third cycle of the redox treatment because the TPR profiles on copper/ceria catalysts are reproducible only after the first one, as also reported by Zimmer et al [59] and by Caputo et al [52] and attributed to copper redistribution during the reduction process, stabilizing copper in lower energy sites. In the same figure, the TPR profile of 4%CuO/CeO 2 [52] (catalyst with the same copper load on the commercial ceria from Grace with 56 m 2 /g SSA) and of S5-M [54] (ceramic monolith washcoated with copper/ceria slurry with the same nanometric ceria and the same copper content of 4CuCe) are shown for comparison.…”

Section: H 2 Temperature Programmed Reduction (Tpr)supporting

confidence: 55%

Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

2018

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Abstract:Despite of the huge number of papers about the catalytic preferential oxidation of CO (CO-PROX) for the purification of H 2 streams, there is still a need for more effective catalysts in order to reduce the large required catalyst volume of CO-PROX unity. In this work, large surface area nanometric ceria was used as support for CuO/CeO 2 catalysts with CuO load up to 10 wt % easily dispersed by wet impregnation. Catalysts were characterized by ICP-MS, XRD, SEM/EDS, N 2 physisorption, H 2 temperature programmed reduction (TPR), and CO 2 temperature programmed desorption (TPD) and tested under different reaction conditions (including under feed containing inhibiting species such as CO 2 and H 2 O). Catalytic tests revealed that our samples show high activity and selectivity even under stringent reaction conditions; moreover, they result among the most active catalysts when compared to those reported in the scientific literature. The high activity can be related to the enhanced amount of highly dispersed copper sites in strong interaction with ceria related to the nature of the nanometric support, as evidenced by the characterization techniques. Despite the high concentration of active copper sites, catalytic performance is limited by CO 2 desorption from ceria in the neighborhood of copper sites, which prevents a further improvement. This suggests that new catalyst formulations should also provide a lower affinity towards CO 2 .

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Section: H 2 Temperature Programmed Reduction (Tpr)supporting

confidence: 55%

Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

2018

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“…These TPR peaks can be assigned to the reduction of the surface and of some of the bulk CeO 2 particles (Ce 4+ to Ce 3+ ) [32,33]. Indeed, according to the literature [34][35][36], during the TPR of pure ceria, superficial cerium ions are reduced by H 2 at approximately 540°C. It is generally assumed, however, that the surface reduction of ceria is largely enhanced in the presence of metals.…”

Section: Oxygen Storage Capacity (Osc) and Catalyst Reducibility (Tpr)mentioning

confidence: 88%

Oxidative steam reforming of ethanol over Ir/CeO2 catalysts: A structure sensitivity analysis

Cai

Wang

Daniel

et al. 2012

Journal of Catalysis

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“…(Cho and Ihm, 2002 (Xu et al, 2012;Ji et al, 2013). In addition, CeO 2 is also frequently studied in the environmental catalysis as its high oxygen-storage capacity and facile redox cycle of Ce 4+ /Ce 3+ (Skårman et al, 2002;Zimmer et al, 2002;Dai et al, 2007). The addition of CeO 2 is believed to improve the catalyst oxygen storage capacity and facilitate the oxygen mobility over catalyst (Wu et al, 2008 , and the gaps reach maximum of 12.1%.…”

Section: Effects Of Oxygen On Pcdd/fs Destructionmentioning

confidence: 99%

Catalytic Decomposition of PCDD/Fs over Nano-TiO2 Based V2O5/CeO2 Catalyst at Low Temperature

Lin

et al. 2016

Aerosol Air Qual. Res.

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Catalytic decomposition of PCDD/Fs (Polychlorinated dibenzo-p-dioxins and furans) over nano-TiO 2 based V 2 O 5 /CeO 2 catalyst is investigated at 180°C based on a stable PCDD/Fs generating system. Step impregnation method is used to prepare the powder catalyst, and catalyst characterization is conducted by XRD and TPR. Effects of oxygen, water vapour and sulphur dioxide on PCDD/Fs destruction are studied in terms of destruction efficiency. Oxygen plays a positive role on PCDD/Fs destruction by accelerating the conversion of V3+ O x and Ce 4+ O x . The destruction efficiencies of PCDD/Fs increase from 67.6% to 77.8% with oxygen contents increasing from 11 vol.% to 21 vol.%. In the absence of oxygen, PCDD/Fs can still be destroyed with destruction efficiency of 33.7% due to the lattice oxygen atoms stored by V 2 O 5 and CeO 2 . Water vapour negatively affects the destruction of PCDD/Fs by competitive adsorption. On the other hand, negative destruction efficiencies of TCDD and TCDF are observed in the presence of water, and the values become lower with water vapour contents increasing. This result demonstrates water vapour facilitates the removal of Cl -present on the catalyst surface. SO 2 inhibits the activity of catalyst by poisoning active sites of catalyst. With SO 2 concentration increasing from 0 to 100 ppm, destruction efficiencies of PCDD/Fs significantly decrease from 67.6% to 51.9%. Finally, catalyst regeneration is also investigated at 180°C in the presence of oxygen. Most of PCDD/Fs residues in the catalyst will be destroyed, and catalyst is regenerated without PCDD/Fs contaminated.

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Temperature-Programmed Reaction Spectroscopy of Ceria- and Cu/Ceria-Supported Oxide Catalyst

Cited by 145 publications

References 18 publications

Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

Improved CO-PROX Performance of CuO/CeO2 Catalysts by Using Nanometric Ceria as Support

Oxidative steam reforming of ethanol over Ir/CeO2 catalysts: A structure sensitivity analysis

Catalytic Decomposition of PCDD/Fs over Nano-TiO2 Based V2O5/CeO2 Catalyst at Low Temperature

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