caa a22 4500 606173293 CHVBK 20210128100732.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11244-015-0475-9 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0475-9 Potential of Supported Gold Bimetallic Catalysts for Green Synthesis of Adipic Acid from Cyclohexane [Elektronische Daten] [A. Alshammari, A. Köckritz, V. Kalevaru, A. Bagabas, A. Martin] Adipic acid (AA) is the main raw material for making nylon 6,6 fiber, which is further used in the production of different commercially important products (e.g. coatings, polymers etc.). Herein, we demonstrated a green chemistry route for the one-step oxidation of cyclohexane (CH) to AA using supported bimetallic catalysts containing gold and palladium or silver nanoparticles. The catalysts were prepared in two steps using sol-gel and impregnation techniques and were then characterized by different techniques such as ICP, BET surface area, XRD, TEM etc. Activity tests were carried out using Parr autoclave under the following optimum conditions (400mg of catalysts, acetonitrile as solvent (5ml), 0.1g of TBHP as initiator, 10bar of O2, 150°C). XRD patterns revealed that no reflections corresponding to either Au or Pd are present in Au-Pd/TiO2 system, while a weak reflection belonging to metallic Au phase could be seen in Au-Ag/TiO2 catalyst. In terms of catalytic activity, Pd/TiO2 exhibited somewhat inferior performance (X-CH=16%, S-AA=18%) compared to Au/TiO2 solid (X-CH=25%, S-AA=26%). Interestingly, the combination of Au and Pd (Pd-Au/TiO2) markedly improved the selectivity of AA from 26 to ca. 34%. In case of Au-Ag/TiO2, the combination of Ag and Au (i.e. 1% Au-1% Ag/TiO2) enhances the conversion of CH and selectivity of cyclohexanone (X-CH=33%, S-One=41%); compared to monometallic Ag/TiO2 solid. The results showed that the nature of second metal has shown a clear influence on the conversion of CH as well as the product distribution. Springer Science+Business Media New York, 2015 Adipic acid nationallicence Cyclohexane nationallicence Bimetallic catalysts nationallicence Nano-gold nationallicence Titanium dioxide nationallicence Alshammari A. Materials Science Research Institute, King Abdulaziz City for Science and Technology, King Abdullah Road, P.O. Box 6086, 11442, Riyadh, Saudi Arabia aut Köckritz A. Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059, Rostock, Germany aut Kalevaru V. Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059, Rostock, Germany aut Bagabas A. Materials Science Research Institute, King Abdulaziz City for Science and Technology, King Abdullah Road, P.O. Box 6086, 11442, Riyadh, Saudi Arabia aut Martin A. Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059, Rostock, Germany aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1069-1076 1022-5528 58:14-17<1069 2015 58 11244 https://doi.org/10.1007/s11244-015-0475-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0475-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alshammari A. Materials Science Research Institute, King Abdulaziz City for Science and Technology, King Abdullah Road, P.O. Box 6086, 11442, Riyadh, Saudi Arabia aut NATIONALLICENCE 700 1- Köckritz A. Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059, Rostock, Germany aut NATIONALLICENCE 700 1- Kalevaru V. Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059, Rostock, Germany aut NATIONALLICENCE 700 1- Bagabas A. Materials Science Research Institute, King Abdulaziz City for Science and Technology, King Abdullah Road, P.O. Box 6086, 11442, Riyadh, Saudi Arabia aut NATIONALLICENCE 700 1- Martin A. Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059, Rostock, Germany aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1069-1076 1022-5528 58:14-17<1069 2015 58 11244