Formation and Segregation of a Pd-MgO Solid Solution Studied by X-ray Absorption Spectroscopy

被引:3
作者
Okumura, Kazu [1 ]
Morita, Sachiko [1 ]
Iiyoshi, Hikaru [1 ]
Takaba, Hiromitsu [2 ]
机构
[1] Kogakuin Univ, Sch Adv Engn, Dept Appl Chem, Hachioji, Tokyo 1920015, Japan
[2] Kogakuin Univ, Sch Adv Engn, Dept Environm Chem & Chem Engn, Hachioji, Tokyo 1920015, Japan
来源
ACS OMEGA | 2023年
关键词
OXIDE-STABILIZED PALLADIUM(0); REUSABLE CATALYST; MODEL CATALYSTS; ADSORPTION; REDUCTION; PD/MGO; SUZUKI; XPS; NO; CO;
D O I
10.1021/acsomega.2c06604
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Thermal treatment of Pd nanoparticles or Pd(NH3)(4)(NO3)(2) supported on MgO resulted in the formation of a solid solution of Pd-MgO, as evidenced by Pd Kedge X-ray absorption fine structure (XAFS). The valence of Pd in the Pd-MgO solid solution was determined to be 4+ from the comparison of X-ray absorption near edge structure (XANES) with reference compounds. A characteristic shrinkage of the Pd-O bond distance was observed in comparison with that of the nearest-neighboring Mg-O bond in MgO, which agreed with the density functional theory (DFT) calculations. The two-spike pattern was observed in the dispersion of Pd-MgO owing to the formation and successive segregation of solid solutions above 1073 K.
引用
收藏
页码:7507 / 7516
页数:10
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