caa a22 4500 606181342 CHVBK 20210128100810.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10876-014-0781-6 doi (NATIONALLICENCE)springer-10.1007/s10876-014-0781-6 Catalytic Cracking of Methyl tert -Butyl Ether to Isobutene over Brønsted and Lewis Acid Sites on Solid-state Molybdenum Sulfide Clusters with an Octahedral Metal Framework [Elektronische Daten] [Satoshi Kamiguchi, Yasunari Seki, Akiharu Satake, Kazu Okumura, Sayoko Nagashima, Teiji Chihara] Solid-state molybdenum sulfide clusters with an octahedral metal framework, the Chevrel phases, are applied to the catalytic cracking of methyl tert-butyl ether (MTBE) to yield isobutene. The copper salt of the nonstoichiometric sulfur-deficient cluster, Cu x Mo6S8−δ (x=2.94 and δ≈0.3), after storing in air, is thermally activated in a hydrogen stream, followed by the reaction with MTBE. Two kinds of catalytically active sites develop depending on the activation temperature: one developed at 100-200°C is a Brønsted-acidic hydroxo ligand on the copper cation while the other developed at 350-400°C is a Lewis-acidic coordinatively unsaturated molybdenum atom with a sulfur-deficient site. A nonstoichiometric sulfur-deficient neutral cluster Mo6S8−δ (δ≈0.4) also catalyzes the cracking reaction when activated at 400°C. Springer Science+Business Media New York, 2014 Molybdenum sulfide cluster nationallicence Chevrel phase nationallicence MTBE cracking catalyst nationallicence Brønsted and Lewis acid nationallicence Bifunctional catalyst nationallicence Kamiguchi Satoshi Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan aut Seki Yasunari Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, 162-8601, Tokyo, Japan aut Satake Akiharu Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, 162-8601, Tokyo, Japan aut Okumura Kazu Faculty of Engineering, Kogakuin University, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan aut Nagashima Sayoko Graduate School of Science and Engineering, Saitama University, Shimo-Okubo, Sakura-ku, 338-8570, Saitama, Saitama, Japan aut Chihara Teiji Graduate School of Science and Engineering, Saitama University, Shimo-Okubo, Sakura-ku, 338-8570, Saitama, Saitama, Japan aut Journal of Cluster Science Springer US; http://www.springer-ny.com 26/3(2015-05-01), 653-660 1040-7278 26:3<653 2015 26 10876 https://doi.org/10.1007/s10876-014-0781-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 brief-communication jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10876-014-0781-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kamiguchi Satoshi Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan aut NATIONALLICENCE 700 1- Seki Yasunari Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, 162-8601, Tokyo, Japan aut NATIONALLICENCE 700 1- Satake Akiharu Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, 162-8601, Tokyo, Japan aut NATIONALLICENCE 700 1- Okumura Kazu Faculty of Engineering, Kogakuin University, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan aut NATIONALLICENCE 700 1- Nagashima Sayoko Graduate School of Science and Engineering, Saitama University, Shimo-Okubo, Sakura-ku, 338-8570, Saitama, Saitama, Japan aut NATIONALLICENCE 700 1- Chihara Teiji Graduate School of Science and Engineering, Saitama University, Shimo-Okubo, Sakura-ku, 338-8570, Saitama, Saitama, Japan aut NATIONALLICENCE 773 0- Journal of Cluster Science Springer US; http://www.springer-ny.com 26/3(2015-05-01), 653-660 1040-7278 26:3<653 2015 26 10876