Cu-promoted Pt/activated carbon catalyst for glycerol oxidation to lactic acid
Cu-promoted Pt/activated carbon catalyst for glycerol oxidation to lactic acid
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DOI：
10.1016/j.molcata.2016.08.018
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发表时间：
2016-12
影响因子：
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通讯作者：
Chen Zhang;Tao Wang;Xiao Liu;Yunjie Ding
中科院分区：
文献类型：
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作者：
Chen Zhang;Tao Wang;Xiao Liu;Yunjie Ding
研究了一系列活性炭负载铜促进铂（Cu-Pt/AC）催化剂催化甘油氧化制乳酸的性能。Cu负载量（0.1- 2.0wt%）对1.0%Pt/AC催化剂的催化性能有较大影响。其中，0.5%Cu-1.0%Pt/AC催化剂的促进效果最好，在相同的反应条件下，其乳酸产率是1.0%Pt/AC催化剂的2.4倍。对催化剂进行了表征，探讨了催化剂性能与反应性能之间的关系。TEM图像表明，Cu的引入改善了Pt和Cu的分散性，HR-TEM检测到了一些Pt-Cu界面，这将促进甘油的转化。XPS和H_2-TPR分析表明，良好的催化剂性能不仅与合适的表面Pt/Cu摩尔比有关，还与铜物种的氧化态有关。Cu+和Cu 0物质有利于甘油转化和乳酸的产生，而大的CuO颗粒有利于甘油酸的形成。
A series of copper-promoted platinum supported on activated carbon (Cu-Pt/AC) catalysts were investigated for glycerol oxidation to lactic acid. The catalytic performance of 1.0%Pt/AC catalyst was greatly influenced by Cu loading (0.1–2.0 wt%). Among them, the 0.5%Cu–1.0%Pt/AC catalyst showed the best promotional effect, whose lactic acid yield was 2.4 times of that on 1.0%Pt/AC under same reaction conditions. Characterizations were carried out to explore the relationships between catalyst properties and reaction performances. TEM images show that the introduction of Cu improves the dispersion of Pt and Cu, and some Pt-Cu interfaces are detected by HR-TEM, which would facilitate the glycerol transformation. XPS and H2-TPR analyses reveal that good catalyst performance is related with not only a proper surface Pt/Cu molar ratio, but also copper species’ oxidation states. Cu+and Cu0species favor glycerol conversion and lactic acid production, whereas large CuO particles facilitate the formation of glyceric acid.