Highly stable, mesoporous mixed lanthanum–cerium oxides with tailored structure and reducibility

Liang, Shuang; Broitman, Esteban; Wang, Yanan; Cao, Amin; Veser, Götz

doi:10.1007/s10853-010-5168-y

Cited by 42 publications

(34 citation statements)

References 55 publications

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“…Between the two regions, the signal falls below baseline (arrow in Figure ), and this implies that H 2 was physically adsorbed in the first region and released in the 600–700 °C temperature range, which is in agreement with the results of Bruce et al Similar reduction profiles were found for ceria with low La content (up to 5 atom‐%), as shown in Figure . H 2 uptake decreases for promoted samples, due to lattice replacement of Ce 4+ ions by nonreducible La 3+ ions, as was concluded by previous XRD analysis and in agreement with the literature . CeLa50 is an exception; it does not follow said trend.…”

Section: Resultssupporting

confidence: 90%

“…An even larger difference between bulk and superficial concentration is found in the case of CeLa50. Other authors have also reported this same feature for mesoporous CeLa materials synthesized by the reverse microemulsion method …”

Section: Resultssupporting

confidence: 64%

“…The addition of La to ceria is extensively reported in the literature, given that it is the most abundant lanthanide and a common impurity in cerium precursor salts. Several authors have suggested an improvement of oxygen storage capacity of ceria on addition of La to its lattice , . Moreover, the use of Cu and Ni catalysts supported on lanthana‐doped ceria (CeLa) has been reported for the WGS reaction, although no composition screening was carried out ,…”

Section: Introductionmentioning

confidence: 99%

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Low‐Cost Catalysts for the Water Gas Shift Reaction Based on Cu–Ni on La‐Promoted Ceria

2018

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Proton‐exchange membrane fuel cells are of great interest for vehicular applications. A highly pure, sustainably obtained H2 stream is desirable to use as the cell feed. In the water gas shift (WGS) process, large amounts of CO, which is a poison for the cell anode, are removed from a bioalcohol‐derived H2 stream before it enters the cell. In this study, Cu–Ni catalysts supported on La‐doped ceria were analyzed and studied in the WGS reaction. The supports were prepared by the urea thermal decomposition method with different percentages of La as a promoter of ceria. The metal phase was incorporated by incipient wet impregnation. Many characterization techniques were employed in this work (BET, XRD, SEM, ICP, TPR, OSC), and the relationship between the resulting properties and catalytic performance was investigated to determine the effect of La. A mixture of Cu and Ni was found to be the most effective active phase, having considerable activity and selectivity towards the desired reaction. Low degrees of La doping in ceria enhance oxygen mobility in the lattice. A commercial Ce salt containing La as its main impurity (ca. 2 %) is a convenient precursor, given its good performance and low cost compared to a high‐purity salt.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Low‐Cost Catalysts for the Water Gas Shift Reaction Based on Cu–Ni on La‐Promoted Ceria

2018

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“…It is a new reduction temperature and remarkably relative to that of pure CeO 2 nanorods. In comparison with the reference, due to the synergist interaction between La–O and Ce–O, the reduction temperature of Ce-La nanorods was higher than pure CeO 2 [31, 54]. It could be found that the binary oxides should have independent CeO 2 and LaO x .…”

Section: Resultsmentioning

confidence: 85%

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Zhong

Zhu

et al. 2017

Nanoscale Res Lett

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One-dimensional (1D) Ce-La nanorods with different La contents (Ce and La in the molar ratio of 1:0, 3:1, 1:1, 1:3, and 0:1) were synthesized by hydrothermal process. Au/Ce-La nanorod catalysts were obtained by a modified deposition-precipitation method. The samples were characterized by N2 adsorption-desorption (BET), ICP, X-ray diffraction (XRD), SEM, TEM, EDX, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and temperature-programmed reduction (H2-TPR). It revealed that La existed as LaOx in the 1D nanorods. The catalysis results demonstrated that the mixed binary Ce-La nanorod oxides could be a good support for gold catalysts. The contents of La had an important influence on the catalytic performance of Au/Ce-La nanorod catalysts. Among the catalysts, when the Ce/La molar ratio was 3:1, the 1.0%Au/Ce0.75-La0.25 nanorods pretreated at 300 °C showed the best activity among the catalysts for CO oxidation, which could convert CO completely at 30 °C. The catalysts also performed high temperature resistance and good stability for CO oxidation at the reaction temperatures of 40, 70, and 200 °C.

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“…In comparison to La-incorporated HfO 2 , the La-incorporated CeO 2 shows better HK properties. This can be attributed to the fact that Ce and La have similar atomic and chemical properties, 25 thus allowing a ready intermixing of the two species in the stack.…”

Section: Figures 1(a) and 1(b) Show Transmission Electron Microscopy mentioning

confidence: 99%

Leakage current and structural analysis of annealed HfO2/La2O3 and CeO2/La2O3 dielectric stacks: A nanoscopic study

Shubhakar

Pey

Bosman

et al. 2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Grain boundaries in the polycrystalline microstructure of post-annealed high-κ (HK) dielectrics are a major limitation in the reliability of HK dielectrics used for advanced CMOS technologies. Another challenge in the field of HK dielectrics is to ensure higher drain drive current in CMOS, while maintaining low leakage current. In this work, the authors demonstrate enhanced performance of HfO2 and CeO2 dielectrics by incorporating lanthanum. The resulting stacks show promising dielectric characteristics with reduced leakage current and uniform (amorphous) crystal structure. The improved HK characteristics were shown to occur even over nanometer-length scales using scanning probe microscopy and transmission electron microscopy, in agreement with previous studies based on micron-scale device-level measurement.

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Highly stable, mesoporous mixed lanthanum–cerium oxides with tailored structure and reducibility

Cited by 42 publications

References 55 publications

Low‐Cost Catalysts for the Water Gas Shift Reaction Based on Cu–Ni on La‐Promoted Ceria

Low‐Cost Catalysts for the Water Gas Shift Reaction Based on Cu–Ni on La‐Promoted Ceria

Synthesis and CO Oxidation Activity of 1D Mixed Binary Oxide CeO2-LaO x Supported Gold Catalysts

Leakage current and structural analysis of annealed HfO2/La2O3 and CeO2/La2O3 dielectric stacks: A nanoscopic study

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