Preparation of supported copper catalysts

Dumas, J.; Géron, C.; Kribii, Abderahim; Barbier, J.

doi:10.1016/s0166-9834(00)83256-x

Cited by 54 publications

(20 citation statements)

References 18 publications

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“…Integration of the combined peak area suggests complete reduction, although the intensity ratio for the two peaks is not even, suggesting that the sample resides in a mixture of Cu + and Cu 2+ states following calcination. Indeed, the relative proportion of Cu + and Cu 2+ as well as the temperature at which these reduction stages take place has previously been shown to depend on both Cu dispersion and calcination temperature [53]. The TPR profile does not suggest the formation of a copper aluminate phase to any significant extend which is consistent with previous reports which highlight that calcination temperatures in excess of 873 K are necessary to form such a phase [26].…”

Section: Resultssupporting

confidence: 89%

Cu/Al 2 O 3 catalysts modified with Pd for selective acetylene hydrogenation

McCue

McRitchie

Shepherd

et al. 2014

Journal of Catalysis

172

142

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Section: Resultssupporting

confidence: 89%

Cu/Al 2 O 3 catalysts modified with Pd for selective acetylene hydrogenation

McCue

McRitchie

Shepherd

et al. 2014

Journal of Catalysis

172

142

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“…The TPR results indicate the presence of only one active phase, recognized as CuO-like species [12,13]. For catalysts with copper contents over 4 wt% Cu per 100 m 2 /g of alumina, segregation of CuO phase occurs due to saturation of adsorption sites with Cu +2 ions [14][15][16].…”

Section: Discussionmentioning

confidence: 99%

“…8.5 wt% for the c-alumina used in our work). Thus, other phases, such as surface spinel, could be detected by TPR [13,19].…”

Section: Discussionmentioning

confidence: 99%

Preparation and characterization of wet-proofed CuO/Al2O3 catalysts for the oxidation of phenol solutions

et al. 2005

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Two wet-proofed catalysts were prepared by subsequent coating steps with polytetrafluoroethylene fibers over a CuO/cAl 2 O 3 catalyst. They were tested for the oxidation of phenol solutions in a semi-batch reactor. Phenol conversion as well as Chemical Oxygen Demand (COD) was recorded. The hydrophobic coverage reduces the loss of active phase by leaching. Therefore, deactivation was attributed to the deposition of carbonaceous residues on the catalytic surface.

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“…Figure S2 in Supplementary Materials). However, different species of Cu 2+ and Cu + may be also reduced in this temperature range [23,25].…”

Section: Temperature Programmed Reduction By Hydrogen (H 2 -Tpr)mentioning

confidence: 94%

“…In addition, coper aluminate species (CuAl 2 O 4 ) may be formed if traces of extra-framework aluminum (EFAL) remains in the zeolite samples, due for instance to dealumination caused by hydrothermal treatments. CuAl 2 O 4 reduction by H 2 should then occurs around 500 • C [23]. Besides, it was reported that the reduction temperature of exchanged copper species are depending on the zeolite Si/Al ratio, with a decrease in the reduction peak temperature with the increase of the Si/Al ratio [24].…”

Section: Temperature Programmed Reduction By Hydrogen (H 2 -Tpr)mentioning

confidence: 97%

Influence of the Sodium Impregnation Solvent on the Deactivation of Cu/FER-Exchanged Zeolites Dedicated to the SCR of NOx with NH3

et al. 2017

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Abstract:The effect of the sodium addition mode was investigated on model Cu/FER selective catalytic reduction (SCR) catalysts with two copper loadings (2.8 wt. % and 6.1 wt. %) in order to compare samples with or without over-exchanged copper. Na was added by wet-impregnation using two solvents: water or ethanol. Catalysts were evaluated in Standard and Fast-SCR conditions, as well as in NO and NH 3 oxidation. They were characterized by H 2 -TPR, NO and NH 3 adsorption monitored by FT-IR. As expected, whatever the copper loading, ammonia adsorption capacity was decreased by Na additions. Interestingly, characterizations also showed that Na impregnation in water favors the migration of the Cu-exchanged species, leading to the formation of CuO extra-framework compounds. Consequently, for both copper loadings, Na impregnation in water led to a stronger catalyst deactivation than impregnation in ethanol. Finally, the NO x conversion at low temperature (250 • C) appeared mainly affected by the loss in NH 3 adsorption capacity whereas the deNO x deactivation at high temperature (500 • C) was rather governed by the decrease in the exchanged copper ratio, which also induced a partial inhibition of NO and NH 3 oxidation behaviors.

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Preparation of supported copper catalysts

Cited by 54 publications

References 18 publications

Cu/Al 2 O 3 catalysts modified with Pd for selective acetylene hydrogenation

Cu/Al 2 O 3 catalysts modified with Pd for selective acetylene hydrogenation

Preparation and characterization of wet-proofed CuO/Al2O3 catalysts for the oxidation of phenol solutions

Influence of the Sodium Impregnation Solvent on the Deactivation of Cu/FER-Exchanged Zeolites Dedicated to the SCR of NOx with NH3

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