Synthesis and characterization of gold-containing oxides of K2NiF4 or Nd2CuO4 structure type
Tóm tắt
In this work, different materials of Nd2CuO4 and K2NiF4 Ruddlesden-Popper structure have been prepared by solid-state reaction in air and high temperatures. The powders of mixed oxides, of general formula La2Li0.5M0.5 − xAu
x
O4 (M = Cu, Ni), were prepared from [Au(NH3)4](NO3)3 as gold source. The stoichiometric proportions of the all reagents (including La2O3, NiCO3, CuO) were grounded with a LiOH excess as mineralizer, pressed to form into pellets and heated in static air at temperatures between 750 and 850 °C for several hours. Structural characterization of the synthesized oxides using X-ray diffraction (XRD) are presented. La2Li0.5Au0.5O4, La2Li0.5Cu0.5O4, and La2Li0.5Ni0.5O4, three previously known oxides, were obtained. As expected, La2Li0.5Ni0.5O4 and La2Li0.5Cu0.5O4 consist of an ordered K2NiF4 Ruddlesden-Popper structure, while the La2Li0.5Au0.5O4 compound exhibits a Nd2CuO4 type structure. On the other hand, the preparation of the new proposed group La2Li0.5M0.5 − xAuxO4 (x = 0.0125–0.5) containing gold and nickel/copper simultaneously, under the studied conditions, was not possible. The experimental results revealed that the host structures are intolerant with respect to M (Cu or Ni) and Au cation double substitution. The difficulty to obtain the new phases is discussed regarding the exceptional instability displayed by the trivalent state of gold ion (Au3+) and the soft interactions of this specie with the lithium cation. Finally, the monophasic oxides, more interesting in terms of catalytic activity, were analyzed by temperature-programmed reduction (TPR-H2).
Tài liệu tham khảo
Haruta M, Kobayashi T, Sano H, Yamada N (1987) Novel gold catalysts for the oxidation of carbon monoxide at a temperature far below 0 °C. Chem Lett 405:405–408
Haruta M (2004) Gold as a novel catalyst in the 21st century: preparation, working mechanism and applications. Gold Bull 37:27–36
Hashmi ASK, Hutchings GJ (2006) Gold catalysis. Angew Chem Int Ed 45:7896–7936
Prati L, Villa A (2012) The art of manufacturing gold catalysts. Catalysts 2:24–37
Hashmi ASK (2000) New and selective transition metal catalyzed reactions of allenes. Angew Chem Int Ed 39:2285–2288
Hashmi ASK (2000) Highly selective gold-catalyzed arene synthesis. J Am Chem Soc 122:11553–11554
Hashmi ASK (2007) Gold-catalyzed organic reactions. Chem Rev 107:3180–3211
Pflästerer D, Hashmi ASK (2016) Gold catalysis in total synthesis—recent achievements. Chem Soc Rev 45:1331–1367
Cotton SA (1997) Silver and gold. In: Chemistry of precious metals, 1st edn. Chapman & Hall, London, pp 273–283
Shi H, Asahi R, Stampf C (2007) Properties of the gold oxides Au2O3 and Au2O: first-principles investigation. Phys Rev B 75:205125
Kurzman JA, Ouyang X, Im WB, Li J, Hu J, Scott SL, Seshadri R (2010) La4LiAuO8 and La2BaPdO5: comparing two highly stable d 8 square-planar oxides. Inorg Chem 49:4670–4680
Etourneau J, Portier J (1992) The role of the inductive effect in solid state chemistry: how the chemist can use it to modify both the structural and the physical properties of the materials. J Alloys Compd 188:1–7
Abbattista F, Vallino M, Mazza D (1985) Preparation and crystallographic characteristics of the new phase La2Au0.5Li0.5O4. J Less-Common Met 110:391–396
Warda SA, Pietzuch W, Berghöfer G, Kesper U, Massa W, Reinen DZ (1998) Ordered K2NiF4 structure of the solids La2Li1/2M1/2O4 (M(III) = Co, Ni, Cu) and the bonding properties of the MO6 polyhedra in various compounds of this type. J Solid State Chem 138:18–31
Thalinger R, Gocyla M, Heggen M, Dunin-Borkowski R, Grünbacher M, Stöger-Pollach M, Schmidmair D, Klötzer B, Penner S (2016) Ni–perovskite interaction and its structural and catalytic consequences in methane steam reforming and methanation reactions. J Catal 337:26–35
Corma A, García H (2008) Supported gold nanoparticles as catalysts for organic reactions. Chem Soc Rev 37:2096–2126
Zhang Y, Cui X, Shi F, Deng Y (2012) Nano-gold catalysis in fine chemical synthesis. Chem Rev 112(4):2467–2505
Wang H, Fan W, He Y, Wang J, Kondo JN, Tatsumi T (2013) Selective oxidation of alcohols to aldehydes/ketones over copper oxide-supported gold catalysts. J Catal 299:10–19
Skibsted LH, Bjerrum J (1974) Studies on gold complexes. I. Robustness, stability and acid dissociation of tetramminegold(III) ion. Acta Chem Scand A28:740–746
Rodríguez-Carvajal J (1993) Recent advances in magnetic structure determination by neutron powder diffraction. Phys B Condens Matter 192-1:55–69
Rodríguez-Carvajal J (2001) Recent developments of the program FullProf. Commission on powder diffraction (IUCr). Newsletter 26:12–19
Steinhauser G, Evers J, Jakob S, Klapötke TM, Oehlinger G (2008) A review on fulminating gold (Knallgold). Gold Bull 41(4):305–317
Manfait M, Alix AJP, Kappenstein C (1981) Raman and infrared studies of the square planar tetrammine gold(III) and its deuterate. Inorg Chim Acta 50:147–152
Weishaupt M, Strähle J (1976) Crystal structure and vibrational spectrum of tetraamminegold- (III)-nitrate. Z Naturforsch 31:554–558
Li GB, Yang JQ, Fan YX, Tian SJ, Zheng CG (1998) Phase equilibria of the system La2O3-NiO-Li2O at 700, 800, and 900 °C. J Solid State Chem 141-2:457–461
Demazeau G, Parent C, Pouchard M, Hagenmuller P (1972) Sur deux nouvelles phases oxygenées du cuivre trivalent: LaCuO3 et La2Li0.50Cu0.50O4. Mater Res Bull 7(9):913–920
Pietzuch W, Warda SA, Massa W, Reinen D (2000) Die Kristallstruktur von La2Li1/2Au1/2O4 und bindungschemische aspekte. Z Anorg Allg Chem 626:113–117
Laguna A (2008) Modern supramolecular gold chemistry: gold-metal interactions and applications. Jhon Wiley-& Sons, New York, pp 41–48
Hu Z, Kaindl G, Warda SA, Reinen D, de Groot FMF, Müller BG (1998) On the electronic structure of Cu(III) and Ni(III) in La2Li1/2Cu1/2O4, Nd2Li1/2Ni1/2O4, and Cs2KCuF6. Chem Phys 232:63–74
Haines RI, McAuley A (1981) Synthesis and reactions of nickel(III) complexes. Coord Chem Rev 39:77–119
Guo C, Zhang J, Zhang X (2008) Comparative study of LaNiO3 and La2NiO4 catalysts for partial oxidation of methane. React Kinet Catal Lett 95:89–97
Kurzman JA, Moffitt SL, Llobet A, Seshadri R (2011) Neutron diffraction study of La4LiAuO8: understanding Au3+ in an oxide environment. J Solid State Chem 184(6):1439–1444