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Leaching of heavy metals under ambient resembling conditions from hydrotreating spent catalysts

机译：加氢处理废催化剂在环境类似条件下浸出重金属

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摘要

Spent hydrotreating catalysts are not inert to air, humidity and temperature, as the combination of these factors may gradually leach metals from the catalyst causing contamination of land and groundwater. In order to investigate the combined effect of ambient variables on metals leaching, a spent hydrotreating catalyst is placed in a tin can heated at 40-50 ℃ and then treated for 1000 h under a continuous flow of wet air. Said spent catalyst contains 10.68 wt.% V, 0.43 wt.% Fe, 2.67 wt.% Ni and 3.78 wt.% Mo as well as 14.7 wt.% coke and 19.4 wt.% sulfur, the latter basically in the form of metallic sulfides. During the leaching experiment, samples of spent catalyst are taken at different times to track the evolution of metals and coke/sulfur content. At the end of the test, even though relatively low temperatures are used, Ni is fully removed, Mo and V are partially extracted (around 25% for each metal) while the Fe content increases. Practically no leaching of metals is observed on the sulfur/coke-free fresh catalyst subjected to an identical experimental procedure. The presence of sulfur and coke on the spent catalyst clearly enhances metals leaching. The sulfur oxides produced from the oxidation of metallic sulfides with air, in combination with water, results in the formation of acidic species, which have a strong positive influence in leaching metals from the spent catalyst.
机译：废加氢处理催化剂对空气，湿度和温度不是惰性的，因为这些因素的结合可能会逐渐从催化剂中浸出金属，从而污染土地和地下水。为了研究环境变量对金属浸出的综合影响，将用过的加氢处理催化剂放置在加热到40-50℃的锡罐中，然后在连续的湿空气流中处理1000小时。所述废催化剂包含10.68重量％的V，0.43重量％的Fe，2.67重量％的Ni和3.78重量％的Mo以及14.7重量％的焦炭和19.4重量％的硫，后者基本上呈金属形式硫化物。在浸出实验期间，在不同时间采集废催化剂样品，以追踪金属的演变以及焦炭/硫含量。在测试结束时，即使使用相对较低的温度，Ni也会被完全去除，Mo和V会被部分提取（每种金属的含量约为25％），而Fe含量则增加。在经过相同实验程序的无硫/无焦炭的新鲜催化剂上，几乎没有观察到金属的浸出。废催化剂上硫和焦炭的存在明显增强了金属的浸出。金属硫化物与空气的氧化所产生的硫氧化物与水结合，导致形成酸性物质，这些酸性物质对从废催化剂中浸出金属具有积极的作用。

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  • 来源
    《Fuel》 |2013年第8期|286-292|共7页
  • 作者

    S. Ramirez; P. Schacht; R. Quintana-Solorzano; J. Aguilar;

  • 作者单位

    Institute Mexicano del Petroleo, Programa de Investigation en Procesosy Reactores, Eje Central Lazaro Cardenas Norte 152, Col. San Bartolo Atepehuacan, Mexico, D.F. 07730, Mexico;

    Institute Mexicano del Petroleo, Programa de Investigation en Procesosy Reactores, Eje Central Lazaro Cardenas Norte 152, Col. San Bartolo Atepehuacan, Mexico, D.F. 07730, Mexico;

    Institute Mexicano del Petroleo, Programa de Investigation en Procesosy Reactores, Eje Central Lazaro Cardenas Norte 152, Col. San Bartolo Atepehuacan, Mexico, D.F. 07730, Mexico;

    Universidad Autonoma Metropolitana, Division de Ciencias Basicas e Ingenieria, Av. San Pablo 180, Mexico, D.F 02200, Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrotreating; Spent catalyst; Heavy metals; Leaching; Sulfur;

    机译：加氢处理;废催化剂;重金属;浸出硫;

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