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Oxidation of propane to acrylic acid and acetic acid over alkaline earth-doped Mo-V-Sb-O_x catalysts

Journal of Natural Gas Chemistry 2010年第6期19卷 593-599页

作者： chandan S.chaudhari Shailesh S.Sable Hanumant Gurav Ashutosh A.Kelkar Vilas H.Rane Chemical Engineering and Process Development Division National Chemical Laboratory Catalysis Division National Chemical Laboratory

Alkaline earth metal （Mg,Ca,Sr and Ba）-doped Mo-V-Sb-O x catalysts,prepared by a dry-up method,have been investigated for their catalytic performance in the oxidation of propane under different reaction *** catalysts have been characterized by N2 adsorption-desorption,temperature-programmed desorption （TPD） of NH3,SEM and *** of water vapor on the catalytic performance,particularly on the selectivities to acetic acid and acrylic acid,has also been *** selectivity to acrylic acid was improved significantly by the doping of alkaline earth metals to Mo-V-Sb-O x *** surface acidic sites of the catalyst decreased with the doping of the catalyst with alkaline earth metals,which ultimately was found to be beneficial for obtaining high selectivity to acrylic *** catalytic activity and product selectivities were found to be influenced by the reaction temperature,C3H8/O2 ratio and space velocity.A significant improvement in the selectivity to acrylic acid has also been observed by the addition of water vapor in the feed of propane and oxygen in the oxidation of propane.

关键词： oxidation of propane surface acidity alkaline earth doped Mo-V-Sb-Ox catalysts acrylic acid acetic acid

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Selective C3-alkenylation of oxindole with aldehydes using heterogeneous CeO2 catalyst

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Chinese Journal of Catalysis 2020年第6期41卷 970-976页

作者： MdNurnobi Rashed Abeda Sultana Touchy chandan chaudhari Jaewan Jeon S.M.A.Hakim Siddiki Takashi Toyao Ken-ichi Shimizu Institute for catalysis hokkaido universityN-21W-10sapporo 001-0021japan Department of chemical systems engineering graduate school of engineeringnagoya universitynagoya 464-8603japan Elements strategy initiative for catalysts and batteries kyoto universitykatsurakyoto 615-8520japan

We report herein that a commercially available CeO2 is an active and reusable catalyst for the C3-selective alkenylation of oxindole with aldehydes under solvent-free conditions. This catalytic method is generally applicable to different aromatic and aliphatic aldehydes, giving 3-alkyledene-oxindoles in high yields(87%–99%) and high stereoselectivities(79%–93% to E-isomers). This is the first example of the catalytic synthesis of 3-alkenyl-oxindoles from oxindole and various aliphatic aldehydes. The Lewis acid-base interaction between Lewis acid sites on CeO2 and benzaldehyde was studied by in situ IR. The structure-activity relationship study using CeO2 catalysts with different sizes suggests that defect-free CeO2 surface is the active site for this reaction.

关键词： Oxindole Aldehyde Aldol condensation C3-alkenylation CeO2 catalyst

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