EXAFS Study of Yb species encapsulated in potassium Y-type zeolite

Yoshida, Tomoko; Tanaka, Tsunehiro; Yoshida, Satohiro; Hikita, S.; Baba, Toshihide; Ono, Yoshio

doi:10.1016/s0038-1098(00)00049-1

Cited by 14 publications

(5 citation statements)

References 7 publications

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“…29) The curve fitting analysis of XANES spectra was carried out by using arctangent TðxÞ and Lorentzian LðxÞ functions (eqs. 1-3): [30][31][32][33][34][35][36][37] …”

Section: Xanes Analysismentioning

confidence: 99%

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Valence of Highly Dispersed Cerium Oxide Species on Silica Quantitatively Estimated by Ce L<SUB>III</SUB>-edge XANES

et al. 2004

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A series of silica-supported cerium oxide samples having various cerium content were prepared by conventional impregnation method, followed by calcination in air. Ce L III -edge XANES study revealed that highly dispersed cerium oxide species on silica surface were predominantly in trivalent oxidation state and cerium oxide nano-particles on silica contain mainly tetravalent cation like as CeO 2 bulk oxide. This elucidated that UV absorption band at 265 nm is assignable to Ce(III) species dispersed on silica.

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“…29) The curve fitting analysis of XANES spectra was carried out by using arctangent TðxÞ and Lorentzian LðxÞ functions (eqs. 1-3): [30][31][32][33][34][35][36][37] …”

Section: Xanes Analysismentioning

confidence: 99%

“…The similar shift due to valence has been observed for rare earth. [31][32][33][34] The relative height of B 2 to T 4 was determined to be 0.85 (Table 1) for CeO 2 .…”

Section: Valence Of Highly Dispersed Cerium Oxide Species On Silica Qmentioning

confidence: 99%

Valence of Highly Dispersed Cerium Oxide Species on Silica Quantitatively Estimated by Ce L<SUB>III</SUB>-edge XANES

et al. 2004

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“…The conventional industrial route to 4-methylthiazole is a multistep process using several hazardous chemicals, while it can be directly synthesized from SO 2 and imine over a basic zeolite by a new environmentally benign method. Among the solid bases, basic zeolites are widely used as shape-selective catalysts in their ion-exchanged or impregnated forms, and the former exhibit relatively weak basicity while the latter have strong basic sites. − Ono and co-workers developed a new preparative method to enhance the potential of basic zeolites, and the resulting rare-earth elements modified alkali-exchanged zeolite Y samples could display the catalytic properties as a superbase. Through the dispersion of KNO 3 on zeolite KL, another superbasic material was also obtained. , Nowadays, solid superbases are highly desired for green chemistry and many efforts have been made for synthesis and application of new solid superbases. − Regardless of the great amount of work dedicated to basic zeolites and related crystalline molecular sieves, the dimension and accessibility of pores were restrained to the sub-nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

Generating Superbasic Sites on Mesoporous Silica SBA-15

Jiang

Wang

et al. 2006

Chem. Mater.

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Superbasic sites have been generated on the mesoporous silica materials for the first time, through a new strategy to prepare the MgO-modified SBA-15 in one-pot synthesis and then to disperse KNO3, possessing the good textural structure of the host and the high basic strength (H -) of 27.0. The in situ coated Mg species passivated the silanol groups on the surface of siliceous SBA-15 so that the mesostructure of SBA-15 could be reserved after the composite was loaded with KNO3 and activated at high temperature. Existence of the special protection layer of MgO on the surface of SBA-15 was also beneficial for decomposition of KNO3 to form superbasic sites on the mesoporous silica. The influence of coating amount of MgO on the protection of the textural properties of SBA-15 is examined and discussed in terms of consuming surface silanol groups. Dispersion and decomposition of KNO3 on the MgO layer is also explored. Other metal oxides such as CaO, ZnO, and Al2O3 are in situ coated on the surface of SBA-15 through one-pot synthesis and their function of protecting SBA-15 is evaluated for comparison with MgO.

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“…63 Another example fused a methyl-CpG-binding domain (MBD) with a DNA-binding fluorogenic dye to achieve selectivity over methylated DNA. 64…”

Section: Fluorogenic Moleculesmentioning

confidence: 99%

Recent Advances in Design of Fluorescence-Based Assays for High-Throughput Screening

et al. 2018

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EXAFS Study of Yb species encapsulated in potassium Y-type zeolite

Cited by 14 publications

References 7 publications

Valence of Highly Dispersed Cerium Oxide Species on Silica Quantitatively Estimated by Ce L<SUB>III</SUB>-edge XANES

Valence of Highly Dispersed Cerium Oxide Species on Silica Quantitatively Estimated by Ce L<SUB>III</SUB>-edge XANES

Generating Superbasic Sites on Mesoporous Silica SBA-15

Recent Advances in Design of Fluorescence-Based Assays for High-Throughput Screening

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