Deactivation and regeneration of in situ formed bismuth-promoted platinum catalyst for the selective oxidation of glycerol to dihydroxyacetone
Deactivation and regeneration of in situ formed bismuth-promoted platinum catalyst for the selective oxidation of glycerol to dihydroxyacetone
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原位形成的铋促进铂催化剂用于甘油选择性氧化成二羟基丙酮的失活和再生
DOI：
10.1039/c8nj04513e
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发表时间：
2018
影响因子：
3.3
通讯作者：
Peng Feng
中科院分区：
文献类型：
--
作者：
Ning Xiaomei;Zhan Liang;Wang Hongjuan;Yu Hao;Peng Feng
在铂催化剂上添加铋可以有效地提高甘油的氧化活性和1，3-二羟基丙酮(DHA)的选择性。然而，这种催化剂体系可能会遭受严重的失活。本文开发了一种铋促进的铂催化剂，通过用硝酸铋维持甘油溶液来选择性地生产DHA，以满足实际应用中连续操作的要求。从浸出、过氧化、结块和中毒等方面探讨了催化剂的失活机理。结果表明，催化剂失活是由于络合中间体在催化剂表面的吸附所致。通过200-300℃后热处理的再生方法可以去除中间体并再生催化剂，允许循环使用至少5次，而不会出现明显的催化剂失活。
Glycerol oxidation over a Pt catalyst can be effectively enhanced by a Bi additive in terms of activity and 1,3-dihydroxyacetone (DHA) selectivity. However, this catalyst system can suffer from serious deactivation. Here, a Bi-promoted Pt catalyst was developed to selectively produce DHA by maintaining the glycerol solution with Bi(NO3)3·5H2O to meet the continuous operation of practical applications. The catalyst deactivation mechanism was investigated in terms of leaching, over-oxidation, agglomeration and poisoning. It was ascertained that the catalyst deactivation was due to the adsorption of chelating intermediates on the catalyst surfaces. A regeneration method by post-heat-treatment at 200–300 °C could remove the intermediates and regenerate the catalyst, allowing recycling for at least 5 runs without clear catalyst deactivation.