A study on the properties of modified CuO samples and the kinetics of carbon monoxide oxidation over the given catalysts

Lộc, Lưu Cẩm; Cuong, Hoang Tien; Trí, Nguyễn Minh; Thoang, Ho Si

doi:10.1080/17458080.2010.524667

Cited by 5 publications

(5 citation statements)

References 18 publications

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“…The observed positive effect of CeO 2 can be explained by two observations: i) from analyzing the IR spectra of the adsorbed CO it follows that CeO 2 enhanced the adsorption of CO because cerium oxide also provides adsorption centres and ii) the presence of Cu 2+ and a big amount of Cu + clusters in sample CuCeAl, as indicated in the data of IR and TPR studied above, that should lead to better reducibility of copper and enhancement of catalytic activity. As it was indicated in our previous paper [15] from analysis of the kinetic data, on these catalysts the reaction rate is directly proportional to partial pressure of CO. Authors [24] suggested that the formation of anionic vacancies was a result of the penetration of Cu 2+ into the CeO 2 lattice that made the reduction of CuO occurs at lower temperatures.…”

Section: Physico-chemical Characteristics Of Catalystsmentioning

confidence: 53%

“…XRD spectrum of sample CuAl [15] 1a, the CuO phase is characterized by the most intensive peaks (2 = 35 ,38 ,49 and 62), the characteristic peaks of -Al 2 O 3 (2 = 37 ,45 and 68) and of aluminate CuAl 2 O 4 (2 = 66) are very weak; at the same time one can observe the characteristic peaks of Pt (2 = 39 ,46 and 67.5) with low intensity. For the catalyst CuAl, with additions of Pt up to 0.2 wt.% the cluster size and dispersion of copper did not change, although one can see reductions in the values of specific surface area (Table 1).…”

Section: Physico-chemical Characteristics Of Catalystsmentioning

confidence: 99%

“…In our previous studies [13][14][15] the following combinations in multi-oxide catalysts have been shown to be optimal catalysts for carbon monoxide oxidation: 10 wt.…”

Section: Introductionmentioning

confidence: 99%

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INFLUENCE OF Pt ON THE PROPERTIES AND ACTIVITY OF CuO-BASED CATALYSTS FOR LOW TEMPERATURE OXIDATION OF CARBON MONOXIDE

Lộc

Trí

Agafonov

et al. 2014

AEJ

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A series of mono-oxide and multi-oxide catalysts: 10 wt.%CuO/γ-Al2O3; 10 wt.%CuO +10 wt.%Cr2O3/γ-Al2O3; 10 wt.%CuO + 20 wt.%CeO2/γ-Al2O3, and 10 wt.%CuO + 10 wt.%Cr2O3 +20 wt.%CeO2/γ-Al2O3 have been prepared and modified by Pt with contents from 0.05 up to 0.3 wt.%. Physico-chemical properties of the catalysts were determined by the methods of BET N2- Adsorption, Hydrogen Pulse Chemisorption (HPC), XRD, TPR, EDS and IR-CO adsorption. The oxidative activity of the catalysts was studied at the temperature range 75 - 300 oC and CO concentration of 0.5 mol.%. Addition of Pt led to weakening of the interaction between CuO and Al2O3, CuO and Cr2O3 that enhanced the reducibility of CuO, resulting in increase of activity of CuAl, CuCeAl and CuCrCeAl catalysts. Meanwhile, due to the reduction of CuCr2O4 formation, the activity of catalysts CuCrAl decreased. The catalyst sample CuCeAl, containing 0.1 wt.% Pt, has been shown to be the best one for the complete oxidation of CO. At the given conditions on this catalyst the complete oxidation of CO to CO2 occurred at 125 oC and space velocity 75,000 h-1 .

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Section: Physico-chemical Characteristics Of Catalystsmentioning

confidence: 53%

Section: Physico-chemical Characteristics Of Catalystsmentioning

confidence: 99%

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INFLUENCE OF Pt ON THE PROPERTIES AND ACTIVITY OF CuO-BASED CATALYSTS FOR LOW TEMPERATURE OXIDATION OF CARBON MONOXIDE

Lộc

Trí

Agafonov

et al. 2014

AEJ

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“…Dow et al [16] reported that for the CuO/Al 2 O 3 catalyst, a peak with a maximum at 210 °C is created due to the reduction of the highly dispersed copper oxide species and the reduction peak with t max > 250 °C has been ascribed to the reduction of bulk-like CuO phases. In our previous paper [17] the TPR profile of Cu/Al sample is characterized by two main reduction peaks: a peak at T max = 375 °C was attributed to the reduction of buck CuO phase and another peak with lower intensity at T max = 300 °C of small cluster CuO. According to Lenarda et al [18], CuO buck shows one reduction peak at 400 °C due to complete reduction of Cu 2+ to Cu°.…”

Section: Physico-chemical Characteristics Of Catalystsmentioning

confidence: 94%

The role of carriers in properties and performance of Pt-CuO nanocatalysts in low temperature oxidation of CO andp-xylene

Lộc¹,

Tri²,

Hoang³

et al. 2014

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Enhancement of water-gas shift reaction efficiency: catalysts and the catalyst bed arrangement Natal'ya A Baronskaya, Tat'yana P Minyukova, Aleksandr A Khassin et al. In this study four optimal catalysts on the basis of Pt-CuO supported on γ-Al 2 O 3 , TiO 2 , CeO 2 and γ-Al 2 O 3 + CeO 2 have been prepared and studied. Characterizations of the catalysts have been carried out by methods of N 2 adsorption, x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and temperatureprogrammed-reduction (TPR). The activity of these catalysts for deep oxidation of CO, p-xylene and their mixture was assessed at temperature range 75−300°C. The results showed that the presence of CO in a mixture with p-xylene has a beneficial effect on the rate of p-xylene conversion; meanwhile the presence of p-xylene shows the inhibition on CO oxidation. In the reactions of the mixture, oxidation of CO and p-xylene occurred simultaneously on PtCuO catalyst supported on γ-Al 2 O 3 , TiO 2 , CeO 2 carriers, but on catalyst PtCu/CeAl the oxidation of p-xylene can proceed only when CO is consumed entirely. Addition of 1.1 to 3.2% mol steam into the gas mixture exhibits no effect on the conversion of CO; meanwhile, it shows the limited effect on oxidation rate of p-xylene on hydrophobic catalysts (PtCu/Ce, PtCu/CeAl and PtCu/ Ti), but strong inhibition on hydrophilic catalyst (PtCu/Al). However, this negative effect of water was reversible.

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“…In spite of having a high catalytic activity, their disadvantages such as the high cost and limited availability inhibit their large application. The catalysts based on metal oxide and mixed oxides having high activity and thermal stability are good solution to replace these weak points of noble metals in the CO oxidation process [7,8]. The results of Ferrandon et al [9] showed that the catalytic activity of CuO supported on γ-Al 2 O 3 was higher than that of Co 3 O 4 , NiO, and Fe 2 O 3 in the CO oxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of CuO-doped catalytic material containing zeolite synthesized from red mud and rice husk ash for CO oxidation

Thi¹,

Tran²,

Tri

et al. 2018

Adv. Nat. Sci: Nanosci. Nanotechnol.

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In this study a series of the CuO-doped materials containing zeolite with varying CuO contents were synthesized from red mud (RM) and rice husk ash (RHA). The rice husk ash/ red mud with the molar ratio of SiO 2 /Al 2 O 3 , Na 2 O/SiO 2 and H 2 O/Na 2 O being 1.8, 2.5 and 60, respectively, were maintained during the synthetic process of materials. The characteristic structure samples were analyzed by x-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET) surface area and H 2 temperature program reduction (H 2 -TPR). The catalytic activity of samples was evaluated in CO oxidation reaction in a microflow reactor at temperature range 200 °C-350 °C. The obtained results showed that all synthetic samples there exist the A-type zeolites with the average crystal size of 15-20 nm, the specific surface area of 21.3 − 54.3 m 2 g −1 , and pore volume of 0.073 − 0.130 cm 3 g −1 . The material synthesized from RM and RHA with the zeolite structure (ZRM, undoped CuO) could also oxidize CO completely at 350 °C, and its activity was increase significantly when doped with CuO. CuO-doped materials with the zeolite structure exhibited excellent catalytic activity in CO oxidation. The ZRM sample loading 5 wt% CuO with particle nanosize about 10-30 nm was the best one for CO oxidation with complete conversion temperature at 275 °C.

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A study on the properties of modified CuO samples and the kinetics of carbon monoxide oxidation over the given catalysts

Cited by 5 publications

References 18 publications

INFLUENCE OF Pt ON THE PROPERTIES AND ACTIVITY OF CuO-BASED CATALYSTS FOR LOW TEMPERATURE OXIDATION OF CARBON MONOXIDE

INFLUENCE OF Pt ON THE PROPERTIES AND ACTIVITY OF CuO-BASED CATALYSTS FOR LOW TEMPERATURE OXIDATION OF CARBON MONOXIDE

The role of carriers in properties and performance of Pt-CuO nanocatalysts in low temperature oxidation of CO andp-xylene

Fabrication of CuO-doped catalytic material containing zeolite synthesized from red mud and rice husk ash for CO oxidation

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