Interactions NO—CO and O2—NO—CO on CuCo2O4/γ-Al2O3 and on γ-Al2O3- and CuCo2O4/γ-Al2O3-supported Pt, Rh and Pt—Rh catalysts, a transient response study

Panayotov, D.; Христова, M.; Velikova, M.

doi:10.1016/0926-3373(96)90076-4

Cited by 7 publications

(10 citation statements)

References 46 publications

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“…In addition, the spinel formation affects the reduction of oxides favorably. The Cu x Co (3-x) O 4 spinel catalysts and those promoted with noble metals Pt-Rh/ CuCo 2 O 4 /c-Al 2 O 3 are found to possess a high activity toward NO reduction with CO [10][11][12]. The main physico-chemical effects exerted by the mixed oxide component allow generation a binary phase, either in the oxidized and/or reduced chemical states.…”

Section: Introductionmentioning

confidence: 96%

NO reduction with CO on Cu–Cr and Co–Cr oxide catalysts supported on Al2O3 and Al2O3 + SiO2

Spassova

Velichkova

Христова

et al. 2010

Reac Kinet Mech Cat

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Cu-Cr and Co-Cr oxide systems supported on Al 2 O 3 and Al 2 O 3 ? SiO 2 were studied in order to find the appropriate combination as a catalyst for the reduction of NO with CO with respect to the active phase and the nature of the support. The catalysts were prepared by successive impregnation of the support with solution mixtures of tartaric acid and nitrate. The catalysts were characterized by atomic absorption spectroscopy (AAS), Brunauer, Emmett, Teller (BET), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) methods. The copper-chromium catalysts are more active than the cobalt-chromium ones. The catalysts supported on Al 2 O 3 ? SiO 2 are more active than the supported on pure alumina. The probable reasons are the higher content of copper and cobalt on the surface of Al 2 O 3 ? SiO 2 and a formation of less active in the studied reaction copper and cobalt aluminates on the alumina supported catalysts.

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Section: Introductionmentioning

confidence: 96%

NO reduction with CO on Cu–Cr and Co–Cr oxide catalysts supported on Al2O3 and Al2O3 + SiO2

Spassova

Velichkova

Христова

et al. 2010

Reac Kinet Mech Cat

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“…Panayotov et al found that Cu x Co 3Àx O 4 /Al 2 O 3 and its metal-promoted variants catalyze the NO-CO reaction in the presence of O 2 at 473 K. 22,23 They examined the activity with a gas feed of NO : CO : O 2 ¼ 1200 : 1240 : 550 ppm (total gas flow rate: 440 cm 3 min À1 ). Under these conditions, 42% of the NO was reduced to N 2 selectively.…”

Section: Introductionmentioning

confidence: 99%

NO reduction with CO in the presence of O2 over Al2O3-supported and Cu-based catalysts

Yamamoto

Tanaka

Kuma

et al. 2002

Phys. Chem. Chem. Phys.

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NO reduction with CO in the presence of O 2 was examined over various kinds of Al 2 O 3 -supported and Cubased catalysts. The effects of loaded elements, supports and calcination temperatures on catalysis for the NO-CO-O 2 reaction system were investigated. We found that the most effective catalyst was 0.5 wt.% Cu/g-Al 2 O 3 calcined at 773 K. The states of Cu species were characterized with XRD, UV/VIS/NIR, EPR, TPR and X-ray absorption spectroscopic techniques. Highly dispersed Cu 2+ species on Al 2 O 3 are active species for selective reduction of NO to N 2 . The aggregated Cu species preferentially oxidize CO without reducing NO x , and the appearance of the aggregated Cu species resulted in drastic reduction in N 2 formation capability.

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“…Finely dispersed cobalt-containing oxide spinels M x Co 3 - x O 4 (0 ≤ x ≤ 1; M = Cu, Ni, Mg, Zn) have been known for a long time as catalysts for complete oxidation of hydrocarbons. , However, during the past decade the interest in them has increased considerably because these compounds are active in reactions involving oxidation of CO and hydrocarbons and the redox conversion of NO + CO mixtures to N 2 and CO 2 . Their high activity, selectivity, and stability with respect to catalytic poisoning, which are comparable with those of noble metal-containing catalysts, offer the possibility for developing catalytic decomposers of harmful components in exhaust gases from internal combustion engines. − The spinel cobaltites of nickel, cobalt, or zinc are thermally unstable and cannot be prepared by a solid-state reaction between the corresponding oxide components. − However, they have been synthesized by using mild-condition techniques, e.g. low-temperature decomposition of mixed oxalates , or of specially designed hydroxide nitrate precursors. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Cation Distribution of the Spinel Cobaltites Cu_xM_yCo₃_-₍_x₊_y₎O₄ (M = Ni, Zn) Obtained by Pyrolysis of Layered Hydroxide Nitrate Solid Solutions

1999

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A series of hydroxide nitrate solid solutions with a simple layered structure and general formula Cu m M n Co 2-(m+n) (OH) 3 NO 3 , (M ) Ni, Zn) has been synthesized by double jet precipitation technique, from the corresponding aqueous metal nitrate solutions and NaOH. X-ray diffraction, infrared spectroscopy, and thermal analysis studies have shown that they are single phases which decompose thermally at about 200 °C, yielding the corresponding single-phase spinel-type oxides Cu x M y Co 3-(x+y) O 4 (x ) 3m/2, y ) 3n/2). The cation distribution in these complex spinels has been calculated on the basis of the tetrahedral and octahedral M-O distances determined by X-ray Rietveld refinement of their structures.

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Interactions NO—CO and O2—NO—CO on CuCo2O4/γ-Al2O3 and on γ-Al2O3- and CuCo2O4/γ-Al2O3-supported Pt, Rh and Pt—Rh catalysts, a transient response study

Cited by 7 publications

References 46 publications

NO reduction with CO on Cu–Cr and Co–Cr oxide catalysts supported on Al2O3 and Al2O3 + SiO2

NO reduction with CO on Cu–Cr and Co–Cr oxide catalysts supported on Al2O3 and Al2O3 + SiO2

NO reduction with CO in the presence of O2 over Al2O3-supported and Cu-based catalysts

Synthesis and Cation Distribution of the Spinel Cobaltites Cu_xM_yCo₃_-₍_x₊_y₎O₄ (M = Ni, Zn) Obtained by Pyrolysis of Layered Hydroxide Nitrate Solid Solutions

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Interactions NO—CO and O2—NO—CO on CuCo2O4/γ-Al2O3 and on γ-Al2O3- and CuCo2O4/γ-Al2O3-supported Pt, Rh and Pt—Rh catalysts, a transient response study

Cited by 7 publications

References 46 publications

NO reduction with CO on Cu–Cr and Co–Cr oxide catalysts supported on Al2O3 and Al2O3 + SiO2

NO reduction with CO on Cu–Cr and Co–Cr oxide catalysts supported on Al2O3 and Al2O3 + SiO2

NO reduction with CO in the presence of O2 over Al2O3-supported and Cu-based catalysts

Synthesis and Cation Distribution of the Spinel Cobaltites CuxMyCo3-(x+y)O4 (M = Ni, Zn) Obtained by Pyrolysis of Layered Hydroxide Nitrate Solid Solutions

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Synthesis and Cation Distribution of the Spinel Cobaltites Cu_xM_yCo₃_-₍_x₊_y₎O₄ (M = Ni, Zn) Obtained by Pyrolysis of Layered Hydroxide Nitrate Solid Solutions