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Wataru Ueda Damian Vitry Tomokazu Kato Nobufumi Watanabe Yusuke Endo 《Research on Chemical Intermediates》2006,32(3-4):217-233
Mo-V-O-based complex metal oxide catalysts were synthesized hydrothermally for the first time, characterized structurally and tested in the selective oxidation of propane to acrylic acid, and the results obtained were compared on the basis of catalyst crystal structures in order to clarify key aspects of alkane selective oxidation over multifunctional metal oxide catalysts. The catalysts tested were black solids of rod-shaped crystals, which had a layer structure in the direction of fiber axis and various high dimensional arrangements of metal octahedra in the cross-section plane. A strong dependency on the octahedra arrangements and a facet dependency were observed, and the roles of metal elements in the course of selective oxidation of propane were clarified by comparing the catalytic performance of various Mo-V-O-based catalysts. We discuss the multi-functional character derived from high dimensional structures of the catalysts and mechanism of the selective oxidation of propane. 相似文献
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Fujita K Nakamura N Ohno H Leigh BS Niki K Gray HB Richards JH 《Journal of the American Chemical Society》2004,126(43):13954-13961
Well-defined voltammetric responses of redox proteins with acidic-to-neutral pI values have been obtained on pure alkanethiol as well as on mixed self-assembled-monolayer (SAM) omega-derivatized alkanethiol/gold bead electrodes. Both azurin (P. aeruginosa) (pI = 5.6) and subunit II (Cu(A) domain) of ba(3)-type cytochrome c oxidase (T. thermophilus) (pI = 6.0) exhibit optimal voltammetric responses on 1:1 mixtures of [H(3)C(CH(2))(n)()SH + HO(CH(2))(n)()SH] SAMs. The electron transfer (ET) rate vs distance behavior of azurin and Cu(A) is independent of the omega-derivatized alkanethiol SAM headgroups. Strikingly, only wild-type azurin and mutants containing Trp48 give voltammetric responses: based on modeling, we suggest that electronic coupling with the SAM headgroup (H(3)C- and/or HO-) occurs at the Asn47 side chain carbonyl oxygen and that an Asn47-Cys112 hydrogen bond promotes intramolecular ET to the copper. Inspection of models also indicates that the Cu(A) domain of ba(3)-type cytochrome c oxidase is coupled to the SAM headgroup (H(3)C- and/or HO-) near the main chain carbonyl oxygen of Cys153 and that Phe88 (analogous to Trp143 in subunit II of cytochrome c oxidase from R. sphaeroides) is not involved in the dominant tunneling pathway. Our work suggests that hydrogen bonds from hydroxyl or other proton-donor groups to carbonyl oxygens potentially can facilitate intermolecular ET between physiological redox partners. 相似文献
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Ho Doris M. L. Nelwamondo Aubrey N. Okubo Ayako Ramebäck Henrik Song Kyuseok Han Sun Ho Hancke Jacobus J. Holmgren Stina Jonsson Sofia Kataoka Osamu Lagerkvist Petra Lee Chi-Gyu Lim Sang Ho Park Jinkyu Park Jong-Ho Pong Boon Kin Sandström Björn Shinohara Nobuo Tan Angela H. J. Toda Nobufumi Tovedal Annika Vesterlund Anna 《Journal of Radioanalytical and Nuclear Chemistry》2018,315(2):353-363
Journal of Radioanalytical and Nuclear Chemistry - The Fourth Collaborative Material Exercise (CMX-4) of the Nuclear Forensics International Technical Working Group (ITWG) registered the largest... 相似文献
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Wataru Ueda Damian Vitry Tomokazu Kato Nobufumi Watanabe Yusuke Endo 《Research on Chemical Intermediates》2006,32(3):217-233
Mo-V-O-based complex metal oxide catalysts were synthesized hydrothermally for the first time, characterized structurally
and tested in the selective oxidation of propane to acrylic acid, and the results obtained were compared on the basis of catalyst
crystal structures in order to clarify key aspects of alkane selective oxidation over multifunctional metal oxide catalysts.
The catalysts tested were black solids of rod-shaped crystals, which had a layer structure in the direction of fiber axis
and various high dimensional arrangements of metal octahedra in the cross-section plane. A strong dependency on the octahedra
arrangements and a facet dependency were observed, and the roles of metal elements in the course of selective oxidation of
propane were clarified by comparing the catalytic performance of various Mo-V-O-based catalysts. We discuss the multi-functional
character derived from high dimensional structures of the catalysts and mechanism of the selective oxidation of propane. 相似文献
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