Investigation on the cation location, structure and performances of rare earth-exchanged Y zeolite

Qiu, Limei; Fu, Ying; Zheng, Jun; Nangui, Huang; Lü, Lei; Gao, Xueying; Xin, Mudi; Luo, Yibin; Yanqiang, Shi; Xu, Guangtong

doi:10.1016/s1002-0721(17)60960-8

Cited by 30 publications

(43 citation statements)

References 25 publications

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“…Besides, it can also be found from Figure that the intensity of the (311) diffraction corresponding to 11.9° in CeY zeolites is weakened, while the intensity of the (222) diffraction corresponding to 12.4° is strengthened with the increase of c and exchange times. It has been reported that the larger the ratio of the intensity of (222) diffraction and (311) diffraction is, the more the RE ions located in the supercage is . Hence, it can be inferred Ce ions locate in the sodalite cage at first and then locate in the supercage with the increase of c and exchange times .…”

Section: Resultsmentioning

confidence: 98%

“…Moreover, the B acid strength is enhanced by the polarizing effect of electrostatic field of neighboring Ce (Ce 3+ or Ce 4+ ) ion . Hence, B acid content and B acid strength of CeY zeolite depend strongly on content of Ce ion . Based on the above‐mentioned analysis, it become interesting to examine the effect of content of Ce ion on acidity of CeY zeolite and its catalytic activity for thiophenic sulfur compounds.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Qin

et al. 2019

ChemistrySelect

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With NaY zeolite as the raw material, CeY zeolites with different content of Ce ions were prepared by liquid phase ion exchange (LPIE) method. Their chemical compositions were measured by X-ray fluorescence spectrometry (XRF) and in situ Fourier transform infrared spectroscopy (FTIR) techniques. Temperatureprogrammed desorption of ammonia (NH 3 -TPD) and FTIR spectra of pyridine (Py-FTIR) techniques were used to characterize acidity of CeY zeolites. With thiophene (TP, C 4 H 4 S) as probe molecule, adsorption and reaction of TP over CeY zeolites were researched by using in situ FTIR spectroscopy. Finally, it can be found that activity of Brönsted(B)-acid-catalyzed reaction of TP firstly increases and then has little change with the increase of concentration of Ce(NO 3 ) 3 solution (c), while increases with the increase of the exchange times by a combination of adsorption and reaction of TP over CeY zeolite with acidity of CeY zeolite and with location of Ce ion in CeY zeolite. Especially, the sulfurmetal (SÀ M) interaction between TP and Ce ion located in the supercage exhibits more influence than B-acid-catalyzed reaction of TP on adsorption desulfurization of CeY zeolite.[a] Z.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Qin

et al. 2019

ChemistrySelect

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“…The above results confirm that the introduction of Ce species further does change the fine structure of CeHY, while it is different from that of other Y zeolites. As described in the reports, a value is that the intensity ratio ( α = I 12.5 / I 11.9 ) variation of peaks at 12.5 °and 11.9 °(corresponds to diffraction plane (311)) can be defined to depict the location of Ce species in the XRD spectra [49] . The larger the α value is, the more the Ce species located in the supercages is.…”

Section: Adsorption Desulfurization Performance Over the Y Zeolitesmentioning

confidence: 99%

“…In recently, some reports have deeply investigated various active sites species in the CeY zeolite (especially, Brønsted acid sites and extra-framework species, etc.) [39,[45][46][47][48][49][50][51] . For example, multiple Ce species as Lewis acid sites in Ce-exchanged Y zeolites have been proposed, such as Ce 3 + , CeO 2 , Ce(OH) 2 + , binuclear octahedral Ce species, and Ce 4 O 4 4 + .…”

Section: Introductionmentioning

confidence: 99%

Ultra-deep adsorptive removal of thiophenic sulfur compounds from FCC gasoline over the specific active sites of CeHY zeolite

Zhang

Qin

et al. 2019

Journal of Energy Chemistry

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“…Thus, it will reduce the separation efficiency in the extraction process. Similarly, if the separation process is only carried out by the precipitation process and without extraction, the presence of impurities on the formed oxide is still abundant and uneven [18][19][20]. In the extraction process-stripping, which is the success effect of separation of rare earth elements are the type of acidity and concentration medium [21].…”

Section: ■ Introductionmentioning

confidence: 99%

Separation Factor of Y/Dy Emulsion on Membrane Process Using Nitric Acid and D2EHPA Solvent

Basuki

Pamungkas

2019

Indones. J. Chem.

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Liquid extraction of Y that containing Dy using bis-2-Ethylhexyl phosphoric acid (D2EHPA) extractant has been conducted. The purpose of this study is to determine the optimum parameter in a separation process that uses membrane emulsion. As the aqueous phase, a mixed solution of Y2O3 and Gd2O3 containing Y 10 g/L and Gd 250 mg/L was used. D2EHPA as extractant or organic phase with a variety of concentration was diluted with kerosene. Emulsifier Span-80 was used to make an emulsion of membrane liquid. The internal phase of the liquid membrane used 0.20–0.50 M nitric acid, and the external phase used 1–5 M nitric acid. The studied parameters were extractant concentration, stirring speed, stirring time, and the ratio of the internal and external phase. X-Ray Fluorescence (XRF) was used for the analysis of Y and Dy. The analysis of Y and Dy used the X-Ray Fluorescence (XRF). The optimization results of the extraction process of Y with emulsion membrane using D2EHPA extractants obtained the following conclusions: the optimum stirring rate was 8500 rpm, the D2EHPA concentration was 4.5% in kerosene, the internal concentration was 0.45 M nitric acid, the external concentration was 4 M nitric acid, the stirring time was 10 min that fixed stirring rate was 500 rpm, and the ratio of internal and external phase was 1:1. This conditions acquired a separation factor (SF) Y-Gd of 7.57.

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Investigation on the cation location, structure and performances of rare earth-exchanged Y zeolite

Cited by 30 publications

References 25 publications

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Ultra-deep adsorptive removal of thiophenic sulfur compounds from FCC gasoline over the specific active sites of CeHY zeolite

Separation Factor of Y/Dy Emulsion on Membrane Process Using Nitric Acid and D2EHPA Solvent

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