A new alkaline-earth metal borate SrB 3 O 4 (OH) 3 ·H 2 O with UV cutoff edge below 190 nm

Zhou, Hai; Chang, Li-Xian; Zhang, Yanhui; Wang, Li; Kurmoo, Mohamedally

doi:10.1016/j.inoche.2018.04.002

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Crystallite size dc slightly varies around 30 nm for x=0 to 0.75, before jumping up for the total introduction of cobalt. The surface areas of all samples, measured by N2 sorption, are between 10-15 m2 g −1 , as expected for samples annealed at high temperature [52]. It can be observed that the observed variation in crystallite size does not correspond to any equivalent change in surface area.…”

Section: Activity Testssupporting

confidence: 73%

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Tran

Martinović

Ceretti

et al. 2020

Applied Catalysis A: General

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In the framework of nowadays challenges in the automotive catalysis, directed to the mitigation of pollution caused by the emissions of internal combustion engines, a series of LaAl1-xCoxO3 perovskites were investigated with the purpose of enhancing the oxidation of soot in the presence of NOx. Perovskite oxides LaAl1-xCoxO3 (x=0; 0.25; 0.5; 0.75 and 1) were synthesized by a solgel route and characterized by different methods: X-Ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), N2-sorption, O2/NOx-temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The perovskite oxides were tested as catalysts for NO oxidation in isothermal mode and for NOx-assisted soot oxidation in temperature programmed reaction. Structural results reveal that Co is well incorporated in the perovskite structure expanding the unit cell, and doping Co may result in the distortion of the BO6 octahedra of the general ABO3 perovskite structure. An increase in Co substitution with x up to 0.75 remarkably promotes the oxidation activity, whereas total replacement of Al by Co degrades the catalytic performance. Among the prepared solids, LaAl0.25Co0.75O3 is the most active for NO oxidation, with a conversion of 78% at 320 °C, and it also exhibits the highest activity for NOxassisted soot oxidation, with a T10% of 377 °C while maintaining high NO2 production (71%). The outstanding performance of LaAl0.25Co0.75O3 is associated with the high mobility of lattice oxygen species and the role of surface adsorbed oxygen seems not to be prominent. The strong correlation of catalytic activity with NOx-TPD profiles suggests that NOx adsorption on catalyst surface is an essential step in soot oxidation. It is also shown that higher calcination temperature promotes the crystallinity of perovskite phase and leads to the improvement in the catalytic activity. The present work indicates that the prepared perovskite catalysts are competitive with noble-metal rivals for NOx-assisted soot oxidation and outperform them in NO2 production for further NOx abatement.

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Section: Activity Testssupporting

confidence: 73%

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Tran

Martinović

Ceretti

et al. 2020

Applied Catalysis A: General

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“…The peak at 915 cm –1 is assigned to the symmetric stretching of the [BO 3 ] groups . The peaks at 1032 and 824 cm –1 are primarily derived from asymmetric and symmetric stretching vibrations of the [BO 4 ] groups . The peaks around 707 cm –1 are derived from the out-of-plane bending modes of B–O in the planar triangular borate groups, and the peak at 590 cm –1 is assigned as the bending modes of the [BO 4 ] tetrahedra groups .…”

Section: Resultsmentioning

confidence: 99%

“…37 The peaks at 1032 and 824 cm −1 are primarily derived from asymmetric and symmetric stretching vibrations of the [BO 4 ] groups. 38 The peaks around 707 cm −1 are derived from the out-of-plane bending modes of B−O in the planar triangular borate groups, and the peak at 590 cm −1 is assigned as the bending modes of the [BO 4 ] tetrahedra groups. 14 The above peak assignments are consistent with recently reported borates, which proves the existence of [BO 3 ] and [BO 4 ] units.…”

Section: ■ Introductionmentioning

confidence: 99%

Ba_3.75MgB₇O₁₄F_2.5: A Mixed Alkaline-Earth Metal Borate Fluoride with Short Ultraviolet Cutoff Edge and Large Birefringence

Bai,

Wang,

Huang

et al. 2023

Inorg. Chem.

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Fluorine-containing borate crystal materials are particularly attractive due to their rich structural chemistry and excellent properties for optical applications. In this work, a new compound Ba 3.75 MgB 7 O 14 F 2.5 has been synthesized through the high-temperature solution method. In the crystal structure of Ba 3.75 MgB 7 O 14 F 2.5 , the [B 7 O 14 ] basic building unit and the [MgO 3 F 3 ] octahedra are interconnected to create a complex three-dimensional network. The structural feature of the less commonly observed [B 7 O 14 ] units is discussed, and it has been found that such units in Ba 3.75 MgB 7 O 14 F 2.5 are most conducive to achieving large birefringence. In addition, Ba 3.75 MgB 7 O 14 F 2.5 exhibits good thermal stability, a short ultraviolet cutoff of 203 nm, and large birefringence (0.081@546 nm), indicating its potential as a new UV birefringent crystal.

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“…Hydroxyborates can simultaneously enhance the gap and improve the birefringence compared with classic borates, which are also potential DUV materials. 31–41 Hydroxyfluorooxoborates composed of DUV [B–O–F/OH] units as new potential candidates have been proposed and confirmed. 42–47 These new deep UV units in borates provide raw materials for exploring new potential DUV materials.…”

Section: Introductionmentioning

confidence: 91%

NaB(OH)₃CH₃: a deep-ultraviolet optical crystal with unprecedented methyl-modified [B(OH)₃CH₃] units

Hu,

Li,

Han

et al. 2024

J. Mater. Chem. C

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A new alkaline-earth metal borate SrB 3 O 4 (OH) 3 ·H 2 O with UV cutoff edge below 190 nm

Cited by 8 publications

References 22 publications

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Ba_3.75MgB₇O₁₄F_2.5: A Mixed Alkaline-Earth Metal Borate Fluoride with Short Ultraviolet Cutoff Edge and Large Birefringence

NaB(OH)₃CH₃: a deep-ultraviolet optical crystal with unprecedented methyl-modified [B(OH)₃CH₃] units

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A new alkaline-earth metal borate SrB 3 O 4 (OH) 3 ·H 2 O with UV cutoff edge below 190 nm

Cited by 8 publications

References 22 publications

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Ba3.75MgB7O14F2.5: A Mixed Alkaline-Earth Metal Borate Fluoride with Short Ultraviolet Cutoff Edge and Large Birefringence

NaB(OH)3CH3: a deep-ultraviolet optical crystal with unprecedented methyl-modified [B(OH)3CH3] units

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Ba_3.75MgB₇O₁₄F_2.5: A Mixed Alkaline-Earth Metal Borate Fluoride with Short Ultraviolet Cutoff Edge and Large Birefringence

NaB(OH)₃CH₃: a deep-ultraviolet optical crystal with unprecedented methyl-modified [B(OH)₃CH₃] units