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  • Matter waves and collective properties of cold atoms and molecules  (1)
  • Rh4(CO)12-derived Rh/SiO2  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Study on catalysis by carbonyl cluster-derived SiO2-supported rhodium for ethylene hydroformylation (1995)
    Springer
    Catalysis letters 32 (1995), S. 61-81 
    Details
    ISSN: 1572-879X
    Keywords: Rh4(CO)12-derived Rh/SiO2 ; surface Rh0 ; Rh0 oxidation ; ethylene hydroformylation ; ethylene hydrogenation ; structure sensitive ; structure insensitive ; coordinative unsaturation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Atmospheric hydroformylation of ethylene was studied under differential conditions over Rh4(CO)12-derived Rh/SiO2 catalysts. The specific activities as functions of Rh dispersions show that ethylene hydroformylation is structure sensitive and ethylene hydrogenation structure insensitive. These structural dependences and in situ IR observations show that Rh0 is the unique active site for catalytic ethylene hydroformylation on Rh/SiO2. The reactions of Rh0-coordinated CO and Rh0-adsorbed CO with C2H4 + H2 at 293 K were monitored by IR spectroscopy. The linear CO adsorbed on Rh0/SiO2 is consumed with formation of propanal, whereas the coordinated CO in Rh6(CO)16/SiO2 and its derivative do not participate in CO insertion. IR study of the thermal decomposition of Rh6(CO)16/SiO2 indicates that the cluster can be stabilized on the surface up to 548 K by gaseous CO under hydroformylation conditions. Moreover, the Rh6(CO)16/SiO2 system exhibits increased catalytic hydroformylation activity with reducing coordinated CO. These results show that coordinative unsaturation on the Rh0 surface is necessary for heterogeneously rhodium-catalyzed hydroformylation and that totally decarbonylated Rh0/SiO2 is most effective. In addition, the oxidation of Rh0 by surface OH− is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806102
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    Paper (German National Licenses)
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    Dipolar bright solitons and solitary vortices in a radial lattice (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-11-14
    Description: Author(s): Chunqing Huang, Lin Lyu, Hao Huang, Zhaopin Chen, Shenhe Fu, Haishu Tan, Boris A. Malomed, and Yongyao Li Stabilizing vortex solitons with high values of the topological charge S is a challenging issue in optics, studies of Bose-Einstein condensates (BECs), and other fields. To develop an approach to the solution of this problem, we consider a two-dimensional dipolar BEC under the action of an axisymmet... [Phys. Rev. A 96, 053617] Published Mon Nov 13, 2017
    Keywords: Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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