Catalytic combustion of methane over Ce1−xLaxO2−x/2/Al2O3/FeCrAl catalysts

Yin, Fengxiang; Ji, Shengfu; Chen, Biaohua; Zhou, Zhongliang; Liu, Hui; Li, Chengyue

doi:10.1016/j.apcata.2006.05.034

Cited by 21 publications

(9 citation statements)

References 34 publications

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“…In comparison with the peak (805°C) of pure CeO 2 , the reduction peaks of the Ce x La 1-x O 2 samples shift to much lower temperature. It indicates that the formation of Ce x La 1-x O 2 solid solution enhanced the bulk reduction of CeO 2 greatly [30,31]. With increasing La content, the reduction peak shifts towards higher temperature, which is in accord with the reported results [15,32].…”

Section: Resultssupporting

confidence: 85%

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Yue

et al. 2011

Reac Kinet Mech Cat

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The heterogeneous catalytic oxidation of volatile organic compounds on Pd/Ce x La 1-x O 2 /monolith catalysts in the temperature range 160-230°C has been studied, which took toluene combustion as a probe reaction. SEM, ICP-OES, XRD, laser Raman spectra, and temperature-programmed reduction (TPR) are used to characterize the Pd/Ce x La 1-x O 2 /monolith catalysts. A high activity of the catalyst with respect to the complete oxidation of toluene to carbon dioxide has been observed. The conversion of toluene approaches 100% at about 210°C.

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Section: Resultssupporting

confidence: 85%

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Yue

et al. 2011

Reac Kinet Mech Cat

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“…S4, ESIw) attributed to the extent of interaction between Ce and Al characteristic of CeAlO 3 that shows a negative effect on the catalytic activity. 41 In the investigated range, no such high temperature reduction peak is observed for the CLA sample. Therefore, combination of these two effects: shift and increase in the intensity of the low temperature peak (surface reduction) and the absence of a high temperature peak (B1000 K) evidences the inhibition of undesirable interaction between Ce and Al.…”

Section: Structural Characterizationmentioning

confidence: 85%

“…Therefore, combination of these two effects: shift and increase in the intensity of the low temperature peak (surface reduction) and the absence of a high temperature peak (B1000 K) evidences the inhibition of undesirable interaction between Ce and Al. 41,42 Thus, in the presence of La, the redox properties of the ceria are greatly influenced.…”

Section: Structural Characterizationmentioning

confidence: 99%

Structural characteristics and catalytic performance of alumina-supported nanosized ceria–lanthana solid solutions

Katta

Thrimurthulu

Reddy

et al. 2011

Catal. Sci. Technol.

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Alumina-supported nanosized ceria-lanthana solid solutions (CeO 2 ÀLa 2 O 3 /Al 2 O 3 (CLA) = 80 : 20 : 100 mol% based on oxides) were synthesized by a modified deposition coprecipitation method from ultra-high dilute aqueous solutions. The synthesized materials were subjected to various calcination temperatures from 773 to 1073 K to understand the surface structure and the thermal stability. Structural and redox properties were deeply investigated by different characterization techniques, namely, X-ray diffraction (XRD), Raman spectroscopy (RS), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), temperature programmed reduction (H 2 -TPR), and Brunauer-Emmett-Teller (BET) surface area. The catalytic efficiency was evaluated for CO oxidation at normal atmospheric pressure. BET surface area measurements revealed that synthesized samples exhibit reasonably high specific surface area. As revealed by XRD measurements, samples maintain structural integrity up to 1073 K without any disproportionation of phases. XPS results suggested that there is no significant change in the Ce 3+ amount during thermal treatments due to the absence of undesirable cerium aluminate formation. A significant number of oxygen vacancies were confirmed from Raman and UV-vis DRS measurements. The CLA 773 sample exhibited superior CO oxidation activity. The better activity of the catalyst was proved to be due to a high dispersion in the form of nanosized ceria-lanthana solid solutions over the alumina support, facile reduction, and a high oxygen storage capacity.

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“…Presently, noble metals like palladium (Pd) and iridium (Ir) are used as a catalyst for methane combustion (Paredes et al, 2004). They are more costly, toxic and highly volatile at elevated temperatures (Yin et al, 2006). Hence, to overcome these drawbacks, three types of iron-based catalysts were prepared using BR for combustion of methane.…”

Section: Use As a Catalyst In Exhaust Gas Cleanermentioning

confidence: 99%

Applications of bauxite residue: A mini-review

2017

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Bauxite residue is the waste generated during alumina production by Bayer's process. The amount of bauxite residue (40-50 wt%) generated depends on the quality of bauxite ore used for the processing. High alkalinity and high caustic content in bauxite residue causes environmental risk for fertile soil and ground water contamination. The caustic (NaOH) content in bauxite residue leads to human health risks, like dermal problems and irritation to eyes. Moreover, disposal of bauxite residue requires a large area; such problems can only be minimised by utilising bauxite residue effectively. For two decades, bauxite residue has been used as a binder in cement industries and filler/reinforcement for composite materials in the automobile industry. Valuable metals and oxides, like alumina (AlO), titanium oxide (TiO) and iron oxide FeO, were extracted from bauxite residue to reduce waste. Bauxite residue was utilised in construction and structure industries to make geopolymers. It was also used in the making of glass-ceramics and a coating material. Recently bauxite residue has been utilised to extract rare earth elements like scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd) and dysprosium (Dy). In this review article, the mineralogical characteristics of bauxite residue are summarised and current progresses on utilisation of bauxite residue in different fields of science and engineering are presented in detail.

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Catalytic combustion of methane over Ce1−xLaxO2−x/2/Al2O3/FeCrAl catalysts

Cited by 21 publications

References 34 publications

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Catalytic combustion of toluene on Pd/Ce x La1−x O2/monolith catalysts

Structural characteristics and catalytic performance of alumina-supported nanosized ceria–lanthana solid solutions

Applications of bauxite residue: A mini-review

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