Xi Zheng
Dalian Institute of Chemical Physics
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Publication
Featured researches published by Xi Zheng.
RSC Advances | 2013
Song Shi; Min Wang; Chen Chen; Fang Lu; Xi Zheng; Jin Gao; Jie Xu
A series of hydrophobic hollow silica nanospheres with high specific surface areas and porous shells were successfully prepared through combination of a one-step reverse-phase microemulsion route and a simple post selective etching method. These materials owned porous shells and high specific surface areas, which were generated in the etching process. The distribution difference of organic groups among the solid nanosphere was innovatively utilized to create a different etching rate between the surface and the inner part of the solid silica nanosphere. After etching, the organic groups are still present on the surface which together with the rough surface give it hydrophobic properties and the contact angles can reach 150°. The reported materials showed good performance in the removal of 4-NP in water.
Journal of Materials Chemistry | 2011
Min Wang; Jiping Ma; Chen Chen; Xi Zheng; Zhongtian Du; Jie Xu
α-Co(OH)2 hierarchical nanoflowers were synthesized using a microemulsion as a nanoreactor. These structures were self-assembled from cobalt hydroxide nanoflakes and possessed flowerlike morphology with a diameter of 200–500 nm. These α-Co(OH)2 nanoflowers exhibited high specific area and porosity and show high activity in the decomposition of cyclohexyl hydroperoxide. 99% conversion and 94% selectivity for K–A oil could be obtained.
Journal of Materials Chemistry | 2012
Min Wang; Chen Chen; Jiping Ma; Xi Zheng; Qingwei Li; Yuqi Jin; Jie Xu
Cobalt-containing SiO2-based nanosphere with multi-nanochambers was prepared via a microemulsion method. Addition of cobalt ammonia complex to microemulsion is a necessary step to obtain this specific structure. This novel material was found to be an efficient catalyst for the decomposition of cyclohexyl hydroperoxide, and high activity of 94% conversion with 93% selectivity for K–A oil could be obtained.
ACS Applied Materials & Interfaces | 2018
Guozhi Zhu; Song Shi; Meng Liu; Li Zhao; Min Wang; Xi Zheng; Jin Gao; Jie Xu
Porous solid bases are increasingly attractive for applications in green chemistry and heterogeneous catalysis under relatively mild conditions. Here, covalent triazine frameworks (CTFs) were first applied as a support for the porous solid strong bases through a redox process between the base precursor KNO3 and CTFs, leading to a relatively low calcination temperature (400 °C). As a result, porous organic frameworks possessing ordered microstructures as well as strong basic sites were successfully synthesized. The materials were characterized by X-ray diffraction, Fourier transform infrared, high-resolution transmission electron microscopy, temperature programmed desorption of CO2, and so forth. The obtained solid bases displayed remarkable catalytic activity in the aerobic oxidation of methylene compounds, and the yield of fluorenones could reach 93.6% at 120 °C, which was nearly 3 times higher than that of the control catalyst. The current research may present a new idea for the construction of porous organic polymers with strong basicity.
Catalysis Communications | 2012
Xi Zheng; Min Wang; Zhiqiang Sun; Chen Chen; Jiping Ma; Jie Xu
Archive | 2012
Zhiqiang Sun; Jie Xu; Xi Zheng
Archive | 2012
Jie Xu; Min Wang; Chen Chen; Jiping Ma; Zhiqiang Sun; Xi Zheng
Catalysis Communications | 2013
Xi Zheng; Min Wang; Zhiqiang Sun; Junxia Liu; Jiping Ma; Jie Xu
ACS Catalysis | 2018
Meng Liu; Song Shi; Li Zhao; Min Wang; Guozhi Zhu; Xi Zheng; Jin Gao; Jie Xu
Catalysis Communications | 2017
Xi Zheng; Jiping Ma; Min Wang; Song Shi; Zhiqiang Sun; Jie Xu