Masaki Tateishi

Pronounced catalytic activity of Fe0.08Cs2.5H1.26PVMo11O40 for direct oxidation of propane into acrylic acid

Abstract Fe 3+ or Ni 2+ -substitution for H + and V 5+ -substitution for Mo 6+ in Cs 2.5 H 0.5 PMo 12 O 40 greatly enhanced the catalytic activity for direct oxidation of propane into acrylic acid. Of the catalysts tested Cs 2.5 Fe 0.08 H 1.26 PVMo 11 O 40 gave the highest yield of acrylic acid, 13%.

Enhancement of catalytic activity of Cs2.5Ni0.08H0.34PMo12O40 by V5+-substitution for oxidation of isobutane into methacrylic a

Abstract V5+-substitution for Mo6+ in Cs2.5Ni0.08H0.34PMo12O40 increased the yields of methacrylic acid and methacrolein. The maximum yields were obtained for the mono-V5+-substituted heteropoly compound, Cs2.5Ni0.08H1.34PVMo11O40.

Synthesis of [PW9O37{Fe3-xNix(OAc)3}](9+x)− (x = predominantly 1 ) and oxidation catalysis by the catalyst precursor

Abstract The Fe 3- x Ni x -substituted Keggin-type heteropolyanion, [PW 9 O 37 {Fe 3- x Ni x (OAc) 3 }] (9+ x )− ( x =predominantly 1), was synthesized and characterized by elemental analysis, Mossbauer, 1 H NMR, magnetic moment, FAB mass, acid/base titration, and IR spectroscopy. The resulting catalyst precursor well catalyzed the selective oxidations of aldehydes, cyclohexene, and cyclohexane.

Liquid-phase oxygenation of hydrocarbons with molecular oxygen catalyzed by Fe2Ni-substituted Keggin-type heteropolyanion

Abstract Alkanes such as adamantane, ethylbenzene and cyclohexane, cyclohexene, and aldehydes are selectively oxidized to the corresponding alcohols, ketones, and acids with molecular oxygen alone catalyzed by the Fe 3− x Ni x -substituted Keggin-type heteropolyanion, [PW 9 O 37 {Fe 3− x Ni x (OAc) 3 }] (9+ x )− ( x = predominantly 1). The catalytic activities of [PW 9 O 37 {Fe 3− x Ni x (OAc) 3 }] (9+ x )− for the oxidation of cyclohexane and butyraldehyde were compared with mono -transition-metal substituted heteropolytungstates and other compounds having oxo-bridged tri-transition-metal sites. In addition, the effects of acetonitrile as a solvent and the addition of isobutyraldehyde were investigated.

Direct oxidation of isobutane into methacrylic acid and methacrolein over Cs2.5Ni0.08-substituted H3PMo12O40

Cs+, and Ni2+, Mn2+ or Fe3+ substitution for H+ in H3PMo12O40 greatly enhanced the catalytic activity for the title reaction and among the catalysts tested Cs2.5Ni0.08H0.34PMo12O40 gave the highest yield of methacrylic acid and methacrolein.