Reactivity of metallic palladium in a K2CO3-K2O-B2O3-Al2O3 melt

Reactivity of metallic palladium in a K2CO3-K2O-B2O3-Al2O3 melt
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K2CO3-K2O-B2O3-Al2O3 熔体中金属钯的反应活性

DOI:
10.1016/j.rechem.2020.100077
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发表时间:
2020
影响因子:
2.3
通讯作者:
Susumu Yonezawa
Susumu Yonezawa
中科院分区:
--
文献类型:
--
作者:
Takashi Okada;Fumihiro Nishimura;Susumu Yonezawa

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本文研究了金属钯在K_2CO_3-K_2 O-B_2 O_3熔体中的反应性随加热温度和时间的变化。通过控制加热条件,提高热处理钯的水溶解度,使热处理产物中钯的最佳提取率为53%。氧化铝坩埚在加热金属钯时会发生部分溶解,这就需要用K_2CO_3-K_2 O-B_2 O_3-Al_2O_3体系来分析钯的增溶。在熔融介质中,氧化钯与硼和铝的含氧阴离子结合形成水溶性钯化合物。关于水溶性钯化合物的信息是通过分析从热处理产物的水浸出产生的含钯溶液中收集的沉淀物获得的。沉淀物含有Pd(0.19重量%)、Al(0.74重量%)、B(2.6重量%)和K(45重量%)。拉曼光谱证实沉淀物中存在氧化钯。在沉淀物中还检测到具有AlO 4和AlO 6结构的铝氧阴离子和作为二硼酸根基团的硼氧阴离子。
The reactivity of metallic palladium in a K2CO3-K2O-B2O3melt is investigated as a function of heating temperature and time. The aqueous solubility of heat-treated palladium is enhanced by controlling the heating conditions leading to an optimum palladium extraction of 53% from the heat-treated product. The alumina crucible used as a reactor partially dissolves during the heating of metallic Pd, which requires the analysis of palladium solubilization to be discussed in terms of K2CO3-K2O-B2O3-Al2O3system. Oxidized palladium combines with boron and aluminum oxyanions as ligands in the molten medium to form water-soluble palladium compounds. Information regarding water-soluble palladium compounds was obtained by analyzing the precipitate collected from the palladium-containing solution produced by water-leaching of the heat-treated product. The precipitate contained Pd (0.19 wt%), Al (0.74 wt%), B (2.6 wt%), and K (45 wt%). Raman spectroscopy confirmed the presence of oxidized palladium in the precipitate. Aluminum oxyanions with AlO4and AlO6structures and boron oxyanions as diborate groups also were detected in the precipitate.
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