Lingshun Xu
University of Science and Technology of China
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Publication
Featured researches published by Lingshun Xu.
Journal of the American Chemical Society | 2013
Qing Yuan; Zongfang Wu; Yuekang Jin; Lingshun Xu; Feng Xiong; Yunsheng Ma; Weixin Huang
The photocatalytic oxidation of methanol on a rutile TiO2(110) surface was studied by means of thermal desorption spectroscopy (TDS) and X-ray photoelectron spectroscopy (XPS). The combined TDS and XPS results unambiguously identify methyl formate as the product in addition to formaldehyde. By monitoring the evolution of various surface species during the photocatalytic oxidation of methanol on TiO2(110), XPS results give direct spectroscopic evidence for the formation of methyl formate as the product of photocatalytic cross-coupling of chemisorbed formaldehyde with chemisorbed methoxy species and clearly demonstrate that the photocatalytic dissociation of chemisorbed methanol to methoxy species occurs and contributes to the photocatalytic oxidation of methanol. These results not only greatly broaden and deepen the fundamental understanding of photochemistry of methanol on the TiO2 surface but also demonstrate a novel green and benign photocatalytic route for the synthesis of esters directly from alcohols or from alcohols and aldehydes.
Journal of the American Chemical Society | 2009
Lingshun Xu; Yunsheng Ma; Yulin Zhang; Zhiquan Jiang; Weixin Huang
By rational design of the FeO(111)/Pt(111) inverse model catalyst and the control experiments, we report for the first time direct experimental evidence for the interfacial CO(ads) + OH(ads) reaction to produce CO(2) at the Pt-oxide interface at low temperatures, providing deep insights into the reaction mechanism and active site of the important low-temperature water-gas shift and preferential CO oxidation reactions catalyzed by Pt/oxide nanocatalysts at the molecular level.
Physical Chemistry Chemical Physics | 2013
Lingshun Xu; Zongfang Wu; Yuekang Jin; Yunsheng Ma; Weixin Huang
We have employed XPS and TDS to study the adsorption and surface reactions of H2O, CO and HCOOH on an FeO(111)/Pt(111) inverse model catalyst. The FeO(111)-Pt(111) interface of the FeO(111)/Pt(111) inverse model catalyst exposes coordination-unsaturated Fe(II) cations (Fe(II)CUS) and the Fe(II)CUS cations are capable of modifying the reactivity of neighbouring Pt sites. Water facilely dissociates on the Fe(II)CUS cations at the FeO(111)-Pt(111) interface to form hydroxyls that react to form both water and H2 upon heating. Hydroxyls on the Fe(II)CUS cations can react with CO(a) on the neighbouring Pt(111) sites to produce CO2 at low temperatures. Hydroxyls act as the co-catalyst in the CO oxidation by hydroxyls to CO2 (PROX reaction), while they act as one of the reactants in the CO oxidation by hydroxyls to CO2 and H2 (WGS reaction), and the recombinative reaction of hydroxyls to produce H2 is the rate-limiting step in the WGS reaction. A comparison of reaction behaviors between the interfacial CO(a) + OH reaction and the formate decomposition reaction suggest that formate is the likely surface intermediate of the CO(a) + OH reaction. These results provide some solid experimental evidence for the associative reaction mechanism of WGS and PROX reactions catalyzed by Pt/oxide catalysts.
Chinese Journal of Chemical Physics | 2009
Xin Yu; Lingshun Xu; Wenhua Zhang; Zhiquan Jiang; Junfa Zhu; Weixin Huang
The growth and thermal stability of Au clusters on a partially-reduced rutile TiO2(110)-1 1 surface were investigated by high-resolution photoelectron spectroscopy using synchrotron-radiation-light. The valence-band photoelectron spectroscopy results demonstrate that the Ti3+3d feature attenuates quickly with the initial deposition of Au clusters, implying that Au clusters nucleate at the oxygen vacancy sites. The Au4f core-level photoelectron spectroscopy results directly prove the existence of charge transfer from oxygen vacancies to Au clusters. The thermal stability of Au clusters on the partially-reduced and stoichiometric TiO2(110) surfaces was also comparatively investigated by the annealing experiments. With the same film thickness, Au clusters are more thermally stable on the partially-reduced TiO2(110) surface than on the stoichiometric TiO2(110) surface. Meanwhile, large Au nanoparticles are more thermally stable than fine Au nanoparticles.
Chemistry: A European Journal | 2017
Lingshun Xu; Yuekang Jin; Zongfang Wu; Feng Xiong; Weixin Huang
Understanding the fundamental processes taking place on Co surfaces during the Fischer-Tropsch (FT) synthesis is of great interest and importance. We herein report a self-anticoking mechanism of a cobalt surface by subsurface oxygen. The active carbidic carbon species for FT synthesis tends to transform into the inactive graphitic carbon species on clean Co(0001) and poisons the Co surface. Subsurface atomic oxygen on Co(0001) can stabilize the active carbidic carbon species and quench the transformation process. These results reveal, to the best of our knowledge, for the first time the reactivity of various surface species on Co surfaces that dynamically maintain a delicate balance to enhance the long-term stability of Co catalysts during FT synthesis.
Journal of Physical Chemistry C | 2013
Bohao Chen; Yunsheng Ma; Liangbing Ding; Lingshun Xu; Zongfang Wu; Qing Yuan; Weixin Huang
Journal of Catalysis | 2013
Zongfang Wu; Lingshun Xu; Wenhua Zhang; Yunsheng Ma; Qing Yuan; Yuekang Jin; Jinlong Yang; Weixin Huang
Journal of Physical Chemistry C | 2010
Lingshun Xu; Yunsheng Ma; Yulin Zhang; Bohao Chen; Zongfang Wu; Zhiquan Jiang; Weixin Huang
Journal of Physical Chemistry C | 2011
Lingshun Xu; Zongfang Wu; Yulin Zhang; Bohao Chen; Zhiquan Jiang; Yunsheng Ma; Weixin Huang
Journal of Physical Chemistry C | 2011
Lingshun Xu; Wenhua Zhang; Yulin Zhang; Zongfang Wu; Bohao Chen; Zhiquan Jiang; Yunsheng Ma; Jinlong Yang; Weixin Huang