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35 results on '"Jin, Shaoqing"'

13. A Facile and Green Method for the Synthesis of SFE Borosilicate Zeolite and Its Heteroatom-Substituted Analogues with Promising Catalytic Performances

Author

Luo, Yi, Wang, Zhendong, Sun, Junliang, Wang, Yingying, Jin, Shaoqing, Zhang, Bin, Sun, Hongmin, Yang, Weimin, Luo, Yi, Wang, Zhendong, Sun, Junliang, Wang, Yingying, Jin, Shaoqing, Zhang, Bin, Sun, Hongmin, and Yang, Weimin

Abstract

Synthesis of SFE-type borosilcate zeolite was successfully carried out using a commercially available low-cost organic structure directing agent (OSDA) with ultra-low OSDA and water contents within a short crystallization time. Heteroatom (Al, Ti, V, or Fe)-substituted SFE-type zeolite analogues were also directly synthesized for the first time. The obtained Al containing zeolites exhibited promising catalytic performances in the disproportion-ation of isopropylnaphthalene.

Published
2018
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30. A facile organosilane-based strategy for direct synthesis of thin MWW-type titanosilicate with high catalytic oxidation performanceElectronic supplementary information (ESI) available: Fig. S1–S8 and Tables S1–S3. See DOI: 10.1039/c8cy01947a

Author

JinS. Jin, Shaoqing, study., G. Tao contributed equally to this, Tao, Guiju, Zhang, Shilin, Luo, Yi, Fu, Wenhua, Wang, Zhendong, Gao, Huanxin, Sun, Hongmin, and Yang, Weimin

Abstract

Although numerous strategies have been developed to improve the diffusion and catalytic activity of MWW-type titanosilicate (Ti-MWW zeolite) in oxidation of bulky molecules, preparation of Ti-MWW zeolite with high external specific surface area (SSA) by a simple and efficient method is still highly required. Herein, a facile organosilane-based synthetic strategy was successfully developed to prepare thin Ti-MWW zeolite with a thickness of 15 ± 5 nm and an external SSA as high as about 210 m2g−1. Moreover, based on the structural characterization, the synthesis mechanism of the thin Ti-MWW zeolite was discussed in detail. Importantly, due to more framework TiO4species and their better accessibility, the obtained thin MWW-type titanosilicate showed superior catalytic performance in epoxidation of bulky olefins than conventional Ti-MWW zeolite. It is believed that this facile organosilane-based synthetic strategy can be used in the development of other highly efficient layered zeolite catalysts.

Published
2018
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31. Effect of Phase Junction Structure on the Photocatalytic Performance in Overall Water Splitting: Ga2O3Photocatalyst as an Example

Author

Jin, Shaoqing, Wang, Xiang, Wang, Xiuli, Ju, Minggang, Shen, Shuai, Liang, Wanzhen, Zhao, Yi, Feng, Zhaochi, Playford, Helen Y., Walton, Richard I., and Li, Can

Abstract

The fabrication of surface phase junctions has proven to be an efficient strategy for the enhancement of photocatalytic activity; however, some questions about these systems are not yet well understood. In this study, the photocatalytic overall water splitting reaction was achieved on photocatalysts with pure and mixed phase compositions of cubic γ-Ga2O3and monoclinic β-Ga2O3. All the Ga2O3photocatalysts can split water stoichiometrically into H2and O2; however, the phase-mixed γ/β-Ga2O3photocatalyst with a small amount of β phase shows the lowest activity. This is opposite from that of the reported α/β-Ga2O3system in which the phase-mixed α/β-Ga2O3photocatalyst with a small amount of β phase shows much higher photocatalytic activity than the individual phases. Much more disordered structure is found between the γ and β phases in the γ/β-Ga2O3photocatalyst with low content of β phase due to the defective spinel structure of γ phase. Spectroscopic characterization and theoretical calculations indicate that the disordered structure serves as defect and charge recombination centers resulting in the decrease of photocatalytic activity. Based on the analysis of α/β-Ga2O3and γ/β-Ga2O3systems, it is proposed that a prerequisite for the formation of phase junction boosting photocatalytic reactions is that the interfacial structure between two phases should not be disordered or defective.

Published
2015
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32. Effects of Zn2+ and Pb2+ dopants on the activity of Ga2O3-based photocatalysts for water splitting.

Author

Wang, Xiang, Shen, Shuai, Jin, Shaoqing, Yang, Jingxiu, Li, Mingrun, Wang, Xiuli, Han, Hongxian, and Li, Can

Abstract

Zn-doped and Pb-doped β-Ga2O3-based photocatalysts were prepared by an impregnation method. The photocatalyst based on the Zn-doped β-Ga2O3 shows a greatly enhanced activity in water splitting while the Pb-doped β-Ga2O3 one shows a dramatic decrease in activity. The effects of Zn2+ and Pb2+ dopants on the activity of Ga2O3-based photocatalysts for water splitting were investigated by HRTEM, XPS and time-resolved IR spectroscopy. A ZnGa2O4–β-Ga2O3 heterojunction is formed in the surface region of the Zn-doped β-Ga2O3 and a slower decay of photogenerated electrons is observed. The ZnGa2O4–β-Ga2O3 heterojunction exhibits type-II band alignment and facilitates charge separation, thus leading to an enhanced photocatalytic activity for water splitting. Unlike Zn2+ ions, Pb2+ ions are coordinated by oxygen atoms to form polyhedra as dopants, resulting in distorted surface structure and fast decay of photogenerated electrons of β-Ga2O3. These results suggest that the Pb dopants act as charge recombination centers expediting the recombination of photogenerated electrons and holes, thus decreasing the photocatalytic activity. [ABSTRACT FROM AUTHOR]

Published
2013
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33. Deep UV resonance Raman spectroscopic study of CnF2n+2 molecules: the excitation of C-C σ bond.

Author

Jin, Shaoqing, Guo, Meiling, Fan, Fengtao, Yang, Jingxiu, Zhang, Ying, Huang, Baokun, Feng, Zhaochi, and Li, Can

Abstract

The σ-σ* transition of C-C bond in CnF2n+2 molecules was studied by deep UV resonance Raman spectroscopy. With the C-C σ bond selectively excited by the deep UV laser at 177.3 nm, the resonance Raman spectra of CnF2n+2 molecules were obtained on our home-assembled deep UV Raman spectrograph. The Raman bands at 1299, 1380 and 2586 cm−1 due to the C-C skeletal stretching modes are evidently enhanced owing to the resonance Raman effect. Based on the resonance Raman spectra and theoretical calculation results, it is proposed that the electronic geometry of CnF2n+2 molecules at the σσ* excited state is displaced along the directions perpendicular and parallel to the C-C skeleton, and the excited C-C bond is not dissociative due to the delocalization of the excited electron in σ* orbital. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2013
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34. Effect of Pt cocatalyst in Pt/TiO2studied by in situ FTIR of CO adsorption

Author

Shen, Shuai, Wang, Xiuli, Ding, Qian, Jin, Shaoqing, Feng, Zhaochi, and Li, Can

Abstract

In situ transmission infrared spectroscopy was used to study the role of Pt cocatalyst in Pt/TiO2using CO as a probe molecule. An 11 cm−1redshift of CO adsorbed on Pt/TiO2was observed under irradiation in the absence of changes in the CO coverage or sample temperature. In contrast, no CO shift was detected on Pt/Al2O3. This indicates that the redshift of the CO adsorption peak is due to the photogenerated electron transfer from TiO2to Pt, and this accounts for the increased photocatalytic activity by the loaded Pt cocatalyst.

Published
2014
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35. Photo-induced H2 production from a CH3OH-H2O solution at insulator surface.

Author

Li, Rengui, Wang, Xiuli, Jin, Shaoqing, Zhou, Xin, Feng, Zhaochi, Li, Zheng, Shi, Jingying, Zhang, Qiao, and Li, Can

Subjects
PHOTOCATALYSIS, EXCITATION energy (In situ microanalysis), ELECTRIC insulators & insulation, BAND gaps, LIGHT absorbance
Abstract

In a conventional photocatalytic or photochemical process, either a photocatalyst or a molecule is excited by irradiation light that has energy greater than the forbidden band (i.e., the band gap) of the semiconductor or the transition energy of an excited state of the molecule, respectively, for a reaction to occur. However, in this work, we found that a considerable amount of H2 can be generated from a CH3OH-H2O solution at a quartz surface using light with energy far outside the electronic absorbance range of the CH3OH-H2O solution; this process should not occur in principle via either conventional photocatalysis or a photochemical process. The H2 production was further confirmed using 266 nm and 355 nm lasers as light sources. Our work demonstrates that photo-induced H2 production can occur on insulator surfaces (e.g., quartz), which were commonly believed to be inert, and will shed light on the surface nature of insulators. [ABSTRACT FROM AUTHOR]

Published
2015
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