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The energetics of La_4LiAuO_8

机译：La_4LiAuO_8的能量学

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摘要

La_4LiAuO_8 is a stable Au~(3+) oxide that was recently examined as a possible model compound for the role of Au~(3+) in heterogeneous catalysis. Due to the paucity of thermodynamic data, the energetics of La_4LiAuO_8 and its likely decomposition product, LiLaO_2, were investigated. The △H(f_ox), of La_4LiAuO_8 and LaLiO_2 are both exothermic at —187.7 ± 5.8 and -41.4 ± 9.6 kJ/mol, respectively. From the thermodynamic data, the decomposition temperature of La4LiAuO8 was calculated as either 979 ± 95 or 1331 ±43 °C for the formation of LiLaO_2 or Li_2O, respectively. Thus, LiLaO_2 is the expected decomposition product. Gold is an interesting and unique catalyst that is relatively inert in the bulk state, but catalytically active when its particle size is reduced to the nanoscale regime.1 Excellent catalytic activities are observed for highly dispersed gold nanoparticles on metal oxide supports, particularly for CO oxidation.2 The catalytic activity of gold nanoparticles is strongly dependent on particle size, but the composition and structure of the supporting oxide also play a role.2 The exact nature of the catalytically active species within metal oxide support systems is still unclear.1 Several studies have suggested that Au° is the active species, but mechanisms involving cationic gold (Au~(3+), Au~+, or both) have also been proposed.3 The low concentration and fine dispersion of gold particles on metal oxide supports hamper experimental investigations of the catalytic species.1 Modeling the system is also a challenge as a wide array of interactions between the gold nanoparticles and oxide supports are possible.3
机译：La_4LiAuO_8是一种稳定的Au〜（3+）氧化物，最近已作为Au〜（3+）在非均相催化中的可能模型化合物进行了研究。由于缺乏热力学数据，因此研究了La_4LiAuO_8及其可能的分解产物LiLaO_2的能量。 La_4LiAuO_8和LaLiO_2的△H（f_ox）分别以-187.7±5.8和-41.4±9.6 kJ / mol放热。根据热力学数据，计算得出La4LiAuO8的分解温度为979±95或1331±43°C，分别用于形成LiLaO_2或Li_2O。因此，LiLaO_2是预期的分解产物。金是一种有趣且独特的催化剂，在本体状态下相对呈惰性，但当其粒径减小至纳米级时具有催化活性。1对于在金属氧化物载体上高度分散的金纳米颗粒，特别是对于CO氧化，观察到优异的催化活性。 .2金纳米颗粒的催化活性在很大程度上取决于粒径，但支持氧化物的组成和结构也起一定作用。2尚不清楚金属氧化物支持体系中催化活性物质的确切性质。1数项研究有人认为Au°是活性物质，但也提出了涉及阳离子金（Au〜（3 +），Au〜+或两者兼有）的机理。3金颗粒在金属氧化物上的低浓度和精细分散会阻碍其发展。催化物种的实验研究。1由于金纳米颗粒和氧化物支持物之间存在广泛的相互作用，因此对系统进行建模也是一个挑战。 ts可能。3

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  • 来源
    《Journal of Materials Research》 |2011年第10期|p.1188-1192|共5页
  • 作者

    Tori Z. Forbes; Joshua A. Kurzman; Ram Seshadri; Alexandra Navrotsky;

  • 作者单位

    Peter A. Rock Thermochemistry Laboratory and NEAT ORU (Nanomaterials in the Environment, Agriculture,and Technology Organized Research Unit), University of California, Davis, California 95616;

    rnDepartment of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106;

    rnDepartment of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106 and Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106;

    rnPeter A. Rock Thermochemistry Laboratory and NEAT ORU (Nanomaterials in the Environment, Agriculture, and Technology Organized Research Unit), University of California, Davis, California 95616;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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