引用本文:
樊金串, 杨瑞卿, 赵杰, 黄伟. 液体石蜡体系中含铜物种的化学变化[J]. 应用化学,
2013, 30(1): 67-72.
doi:
DOI:10.3724/SP.J.1095.2013.20044
Citation: FAN Jinchuan, YANG Ruiqing, ZHAO Jie, HUANG Wei. Chemical Change of Copper Species in Liquid Paraffin[J]. Chinese Journal of Applied Chemistry, 2013, 30(1): 67-72. doi: DOI:10.3724/SP.J.1095.2013.20044
Citation: FAN Jinchuan, YANG Ruiqing, ZHAO Jie, HUANG Wei. Chemical Change of Copper Species in Liquid Paraffin[J]. Chinese Journal of Applied Chemistry, 2013, 30(1): 67-72. doi: DOI:10.3724/SP.J.1095.2013.20044
液体石蜡体系中含铜物种的化学变化
摘要:
针对完全液相法制备的Cu-Zn-Al催化剂在还原前就有低价态Cu存在的问题,考察了几种不同类型的含铜物质在液体石蜡中热处理时,热处理气氛、催化剂各组分间的相互作用以及铜源种类对热处理产物的影响。结果表明,液体石蜡在受热情况下能将Cu2+还原,并且遵循先生成Cu+,再生成单质Cu的逐级还原;Cu2+被还原的程度与铜盐的种类和热处理温度有关。CuO在240℃时可以被液体石蜡还原为Cu2O,在300℃时被还原为单质Cu;在相同温度下,硝酸铜比乙酸铜更容易被液体石蜡还原。完全液相法制备的Cu基催化剂在还原前就有低价态Cu存在的根本原因是液体石蜡的存在。
English
Chemical Change of Copper Species in Liquid Paraffin
Abstract:
To reveal the chemical species of copper,typically the low-valence speices,in Cu-Zn-Al catalyst prepared by complete liquid-phase method before reduction,the effects of heat-treatment atmosphere,interactions among all components and copper precursor on heat-treatment have been systematically studied during the heat treatment of several different kind of copper precursor in liquid paraffin.The results showed that Cu2+ could be reduced by liquid paraffin under heating condition.The Cu+ is formed before the formation of Cu.The reductive degree of Cu2+ was related with the category of copper salts and heat-treatment temperature.CuO can be reduced to Cu2O by liquid paraffin at 240℃,and then to Cu at 300℃.The copper nitrate could be easily reduced by liquid paraffin than copper acetate at the same temperature.The reason of the low-valent copper appearing in Cu-base catalyst prepared by complete liquid-phase method before reduction could be attributed to the presence of liquid paraffin.
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Key words:
- copper
- / cuprous oxide
- / liquid paraffin
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