氮掺杂碳包覆FeCoNi颗粒的合成及催化甘油脱氢制备乳酸

Synthesis of N-doped Carbon Coated FeCoNi Particles and Their Catalytic Application in Glycerol Dehydrogenation for Lactic Acid Production

乳酸作为一种生物质基平台化学品,是合成可生物降解聚合物的理想原料。本文通过一锅法合成了氮掺杂碳包覆FeCoNi合金催化剂。TEM结果表明FeCoNi@NC纳米材料为核壳结构,过渡金属核在热解过程中催化非晶碳石墨化,有利于金属纳米颗粒向碳层之间的电子转移,从而提升催化活性。FeCoNi@NC在催化甘油脱氢反应中表现出优异的催化活性,在220℃时甘油转化率和乳酸的选择性分别达到98.1%和95.6%。另外,外层碳壳的保护作用抑制了合金颗粒的浸出和失活,FeCoNi@NC在连续5次循环使用后仍能保持稳定。这种催化系统将生物柴油副产物甘油升级为高值乳酸提供了一种高效经济的方法借鉴。

Lactic acid,as a biomass-based platform chemical,is an ideal raw material for the synthesis of biodegradable polymers.In this paper,nitrogen-doped carbon-coated FeCoNi alloy catalysts were synthesized by a one-pot method.TEM results showed that FeCoNi@NC nanomaterials were core-shell structures,and the transition metal cores catalyzed the graphitization of amorphous carbon during pyrolysis,which was beneficial for the electron transfer from the metal nanoparticles to the inter-layers of carbon to enhance the catalytic activity.FeCoNi@NC displayed the excellent catalytic activity in catalyzing the glycerol dehydrogenation reaction with the glycerol conversion and lactic acid selectivity reaching 98.1%and 95.6%,respectively,at 220℃.In addition,the protective effect of the outer carbon shell inhibited the leaching and deactivation of the alloy particles,and the FeCoNi@NC remained stable after five consecutive cycles.This catalytic system provides an efficient and economical method for upgrading biodiesel by-product glycerol to high-value lactic acid.