Surface Treatment for Conductive 12 CaO⋅7 Al2O3 Electride Powder by Rapid Thermal Annealing Processing and Its Application to Ammonia Synthesis

作者: Fumitaka Hayashi , Masaaki Kitano , Toshiharu Yokoyama , Michikazu Hara , Hideo Hosono

DOI: 10.1002/CCTC.201301061

关键词:

摘要: The inorganic electride [Ca24Al28O64]4+(e−)4 (C12A7:e−) has unique properties, that is, chemical stability and a low work function comparable to of metal K. However, its surface area is (≈1 m2 g−1) because sintering occurs during high-temperature annealing, which needed remove CaO layers formed by reaction with Ca works as reductant. We report simple synthesis method for moderate-surface-area C12A7:e− (9–19 m2 g−1) using rapid thermal annealing (RTA) technique. consists 1) high-temperature evacuation, 2) reaction metal, 3) RTA. influence these conditions was first studied achieve both high electron concentration. Next, samples were examined Ru catalyst supports NH3 synthesis. activity Ru-loaded as-prepared moderate but increased fivefold RTA processing prior loading result structure reconstruction. improvement in the dispersion degree results from trebled overall (3550 μmol NH 3 gcat−1 h−1 at 340 °C) compared conventional Ru/C12A7:e−.

参考文章(21)
Ken-ichi Aika, Kenzi Tamara, Ammonia Synthesis over Non-Iron Catalysts and Related Phenomena Springer, Berlin, Heidelberg. pp. 103- 148 ,(1995) , 10.1007/978-3-642-79197-0_3
Hisham Z. Massoud, 3 – Rapid Thermal Growth and Processing of Dielectrics Rapid Thermal Processing#R##N#Science and Technology. pp. 45- 77 ,(1993) , 10.1016/B978-0-12-247690-7.50006-8
Katsuro Hayashi, Satoru Matsuishi, Toshio Kamiya, Masahiro Hirano, Hideo Hosono, Light-induced conversion of an insulating refractory oxide into a persistent electronic conductor Nature. ,vol. 419, pp. 462- 465 ,(2002) , 10.1038/NATURE01053
Fumitaka Hayashi, Masakazu Iwamoto, Ammonia synthesis over rhenium supported on mesoporous silica MCM-41 Microporous and Mesoporous Materials. ,vol. 146, pp. 184- 189 ,(2011) , 10.1016/J.MICROMESO.2011.03.035
Toshiharu Yokoyama, Sung-Wng Kim, Michikazu Hara, Hideo Hosono, Masaaki Kitano, Yasunori Inoue, Youhei Yamazaki, Fumitaka Hayashi, Shinji Kanbara, Satoru Matsuishi, Ammonia synthesis using a stable electride as an electron donor and reversible hydrogen store Nature Chemistry. ,vol. 4, pp. 934- 940 ,(2012) , 10.1038/NCHEM.1476
Satoru Matsuishi, Takatoshi Nomura, Masahiro Hirano, Katsuaki Kodama, Shin-ichi Shamoto, Hideo Hosono, Direct Synthesis of Powdery Inorganic Electride [Ca24Al28O64]4+(e−)4and Determination of Oxygen Stoichiometry Chemistry of Materials. ,vol. 21, pp. 2589- 2591 ,(2009) , 10.1021/CM9007987
James L. Dye, Electrides: early examples of quantum confinement. Accounts of Chemical Research. ,vol. 42, pp. 1564- 1572 ,(2009) , 10.1021/AR9000857
Chunshan Li, Daisuke Hirabayashi, Kenzi Suzuki, Synthesis of higher surface area mayenite by hydrothermal method Materials Research Bulletin. ,vol. 46, pp. 1307- 1310 ,(2011) , 10.1016/J.MATERRESBULL.2011.03.023
Ryoichi Kojima, Ken-ichi Aika, Cobalt molybdenum bimetallic nitride catalysts for ammonia synthesis Applied Catalysis A: General. ,vol. 215, pp. 149- 160 ,(2001) , 10.1016/S0926-860X(01)00529-4
Hubert Bielawa, Olaf Hinrichsen, Alexander Birkner, Martin Muhler, The Ammonia-Synthesis Catalyst of the Next Generation: Barium-Promoted Oxide-Supported Ruthenium. Angewandte Chemie. ,vol. 40, pp. 1061- 1063 ,(2001) , 10.1002/1521-3773(20010316)40:6<1061::AID-ANIE10610>3.0.CO;2-B