Effects of CO2 on the stability of Pd/CeO2–TiO2 catalyst for low-temperature CO oxidation

Liang, Feixue; Zhu, Hua; Qin, Zhangfeng; Wang, Guofu; Wang, Jianguo

doi:10.1016/j.catcom.2008.11.031

Cited by 30 publications

(26 citation statements)

References 21 publications

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“…These results are in accordance with Grillo et al (2004). (Liang et al, 2009). In fact, the catalyst showed no deactivation under this feed.…”

Section: Operational Parameter Effects On the Catalytic Performancesupporting

confidence: 94%

“…This might be due to the adsorption of CO 2 to the Co 3 O 4 surface, hindering CO and oxygen attachment to the active sites. The second reason for the inhibiting effect of CO 2 may be related to the carbonate accumulation and the mechanism alteration (Liang et al, 2009). These results are in accordance with Grillo et al (2004).…”

Section: Operational Parameter Effects On the Catalytic Performancesupporting

confidence: 86%

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Synthesis, Characterization and Application of Co–MgO Mixed Oxides in Oxidation of Carbon Monoxide

Fattah

Rezaei

Biabani-Ravandi

et al. 2014

Chemical Engineering Communications

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The present work deals with the synthesis of nanostructured Co-MgO mixed oxides with different weight ratios of Cobalt by a facile co-precipitation method as a catalyst for low temperature CO oxidation. The prepared samples were characterized by X-ray diffraction (XRD), N 2 adsorption/desorption (BET), Fourier transform infrared spectroscopy (FTIR) and Transmission and scanning electron microscopies (TEM and SEM) techniques. The results revealed that inexpensive cobalt-magnesium mixed metal oxide nanoparticles have a high potential as catalyst in low temperature CO oxidation. The Co-MgO mixed oxide with 30 wt.% cobalt had the highest activity. The results showed that the catalysts pretreated under O 2 containing atmosphere possessed higher activity compared to the catalyst pretreated under H 2 atmosphere. Co-MgO catalyst showed a good repeatability in reaction condition. The stability test exhibited that the Co-MgO mixed oxides were highly stable for CO oxidation over a 30 h time on stream in the feed gas containing high amount of moisture and CO 2 . Downloaded by [Gebze Yuksek Teknoloji Enstitïsu ] at 07:15 23 December 2014 2

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“…These results are in accordance with Grillo et al (2004). (Liang et al, 2009). In fact, the catalyst showed no deactivation under this feed.…”

Section: Operational Parameter Effects On the Catalytic Performancesupporting

confidence: 94%

Section: Operational Parameter Effects On the Catalytic Performancesupporting

confidence: 86%

Synthesis, Characterization and Application of Co–MgO Mixed Oxides in Oxidation of Carbon Monoxide

Fattah

Rezaei

Biabani-Ravandi

et al. 2014

Chemical Engineering Communications

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“…The significantly higher intensity of CO atop adsorption than that of bridged adsorption on Pd/TiO 2 in FTIR compared to those on Pd/SiO 2 also evidenced a highly dispersed Pd on TiO 2 , due to the formation of single Pd atoms and/or small 2-D clusters. Different from CO adsorbed on Pd/SiO 2 , CO on Pd/TiO 2 at room temperature also appears weak gas phase CO 2 peaks and surface carbonate species at 1568 and 1351 cm 1 [27,29]. This means CO reacts with the lattice oxygen of the Pd/TiO 2 catalysts, which may be an interface oxygen species between Pd and TiO 2 support, or an inverse spillover oxygen species from the TiO 2 support to Pd.…”

Section: Discussionmentioning

confidence: 86%

Size and support effects for CO oxidation on supported Pd catalysts

et al. 2010

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Supporting Pd catalysts characterized significant different size distribution were obtained using PdCl2, [Pd(NH3)(4)](NO3)(2) and Pd(acac)(2) as precursors. High-resolution transmission electron microscopy (TEM), X-ray diffraction (XRD), in-situ Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy were used to examine the dispersion of Pd. Catalytic performance measurements show that the activities for CO oxidation increase as the Pd particle size decreases and the O-2/CO ratio increases. The activities under oxygen rich conditions are significantly higher than those at near the stoichiometric conditions. Pd on TiO2 prepared by the Pd(acac)(2) precursor is highly dispersed, leading to a considerable activity for CO oxidation at near room temperature. CO oxidation on the 1 wt% Pd/TiO2 and under an O-2/CO ratio of 1 characterized an apparent activation energy of 36.7 kJ/mol, which is closed to those reported for CO oxidation on the supported Au catalysts. The present work demonstrates a high catalytic activity of highly dispersed noble metals, and suggests a promising approach of using noble metals as catalysts with exceeding high efficiency.National Natural Science Foundation of China [20873109]; National Basic Research Program of China (973 program) [2005CB221401, 2010CB732303]; Chinese Ministry of Education [309019]; Ph.D. Programs Foundation of Chinese Ministry of Education [200803841011]; Natural Science Foundation of Fujian Province, China [2008J0168

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“…So the catalytic performance of the H 2 -pretreated catalysts was much higher than that Figure 9 presents the FTIR analysis of the H 2 -pretreated Pd/Fe 2 O 3 catalysts to identify the carboxyl species on the catalyst surface. In the carbonate-like species range (1000-1700 cm −1 ) [32], the peak at 1415 cm −1 was related to the unidentate carbonate species [33], and 1539 cm −1 was detected for the carboxylate species [13]. The band observed at 1630 cm −1 was assigned to the bidentate carbonates [9,34].…”

Section: Xrd Patternsmentioning

confidence: 94%

Preparation of Palladium Supported on Ferric Oxide Nano-catalysts for Carbon Monoxide Oxidation in Low Temperature

Wang

Zhao

et al. 2014

Nano-Micro Lett.

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Catalytic property of Pd/Fe2O3 catalysts on carbon monoxide (CO) oxidation at low temperature were investigated in this paper. Both the as-prepared and H2-pretreated Pd/Fe2O3 catalysts show catalytic performances on CO oxidation. The CO was completely converted at 333 K for the as-prepared sample, whereas at 313 K for H2-pretreated Pd/Fe2O3-573 catalyst. The catalytic performance of the Pd/Fe2O3 catalyst decreases with increased calcination temperature. This may be due to the increased crystallinity of the support and decreased metal-support interaction. Progressive deactivation of the catalysts during long-time reaction was associated with the formation of carbonates on the catalyst surface that inhibits CO activation or intermediate transformation.

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Effects of CO2 on the stability of Pd/CeO2–TiO2 catalyst for low-temperature CO oxidation

Cited by 30 publications

References 21 publications

Synthesis, Characterization and Application of Co–MgO Mixed Oxides in Oxidation of Carbon Monoxide

Synthesis, Characterization and Application of Co–MgO Mixed Oxides in Oxidation of Carbon Monoxide

Size and support effects for CO oxidation on supported Pd catalysts

Preparation of Palladium Supported on Ferric Oxide Nano-catalysts for Carbon Monoxide Oxidation in Low Temperature

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