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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The emergence of bifunctional catalytic properties by the introduction of Bi3+ in defect fluorite-structured PrO1.833
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The emergence of bifunctional catalytic properties by the introduction of Bi3+ in defect fluorite-structured PrO1.833

机译：在缺陷萤石结构Pro1.833中引入Bi3 +的双官能催化性能的出现

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摘要

In the present study, the utility of Pr3+/Pr4+ and Bi3+/Bi(0) redox couples for oxidation and reduction reactions is demonstrated by synthesizing bismuth-substituted PrO1.833 samples following a solution combustion method. The samples retained the defect fluorite structure of PrO1.833 with the inclusion of up to 40 mol% of bismuth, beyond which the rhombohedral structure emerged. The microscopic analysis also reinforced the defect fluorite structure of these samples. The lattice expanded with the inclusion of bismuth. The samples had porous morphology, and the X-ray energy dispersive spectral analysis ensured the presence of Pr and Bi closer to the nominal molar ratio. The intense band at 565 cm(-1) in the Raman spectrum shifted to higher values with a progressive increase in bismuth content due to the creation of more oxygen vacancies. In Pr0.60Bi0.40O2-delta, Pr existed in 43 and 14 oxidation states, as revealed by the X-ray photoelectron spectral analysis. The photoluminescence spectra consisted of 4f-4f transitions of Pr 3+ and emission in the blue region (due to oxygen vacancies). Both Pr0.60Bi0.40O2-delta and PrO1.833 remained paramagnetic in field-dependent and temperature-dependent measurements down to 2 K. The effective magnetic moment, retentivity, and coercivity decreased on moving from PrO1.833 to Pr0.60Bi0.40O2-delta. The bismuth-substituted samples catalyzed the oxidative degradation of xylenol orange and methyl orange. The degraded products from these reactions were identified. The bismuth-substituted samples also catalyzed the reduction of nitroaromatics. These transformations followed pseudo-firstorder kinetics.
机译：在本研究中，通过合成溶液燃烧方法后，通过合成铋取代的PRO1.833样品来证明PR3 + / PR4 +和BI3 + / BI（0）氧化还原伴侣的氧化还原伴侣。样品保留了Pro1.833的缺陷萤石结构，其中包含高达40摩尔％的铋，超出其出现的菱形结构。显微镜分析还加强了这些样品的缺陷萤石结构。晶格随着铋扩增。样品具有多孔形态，X射线能量分散光谱分析确保了Pr和Bi更接近标称摩尔比的存在。拉曼光谱中的565厘米（-1）的强烈带在较高的值移位到较高的值，由于产生更多的氧空位而导致的铋含量逐渐增加。在Pr0.60bi0.40o2-delta中，Pr存在于43和14个氧化状态，如X射线光电子谱分析所揭示的。光致发光光谱由Pr 3+的4F-4F转变和蓝色区域中的发射组成（由于氧空位）。 Pr0.60bi0.40o2-delta和pro1.833均依赖于现场依赖性和温度依赖性测量的顺磁性，从Pro1.833到PR0.60Bi0.40O2移动时，有效磁矩，保持性和矫顽力减少-三角洲。铋取代的样品催化了木烯醇橙和甲基橙的氧化降解。确定来自这些反应的降解产物。铋取代的样品还催化了硝基甲酰基的还原。这些转换遵循伪第一级动力学。

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