煤气化技术是煤炭有效利用的一种重要途径，但煤气化过程中产生的重金属Hg因其剧毒性和对环境持久性危害而引起人们的强烈关注。因此如何有效控制煤气化过程中产生的Hg变得极其重要。前期研究表明，贵金属/金属氧化物复合催化剂可以对煤气中的Hg进行有效脱除，但此类复合材料存在载体作用单一、比表面积较小、贵金属粒子活性位点少、分散性差、反应过程中易脱落和复合纳米粒子难回收再利用等问题。为此，本项目拟通过简单、绿色可控途径制备空心、大比表面积、亚纳米Pd高分散且持久稳定性的Pd/γ-Fe2O3磁性多功能复合材料来解决上述所提及的部分问题，并深入研究亚纳米Pd/γ- Fe2O3空心磁性复合材料协同催化脱除模拟煤气中单质汞的反应机理。最终建立具备脱汞精度高、汞容高和易于回收再利用的亚纳米Pd/γ- Fe2O3催化剂的可控制备方法，明确其催化脱汞机理，从而实现对煤气中有害重金属汞的高效、深度脱除。

Coal gasification technology offers an efficient strategy to utilization of coal. However, heavy metal Hg produced in the coal gasification process has caused serious concern in the society due to its toxic and persistent hazardous for the environment. Therefore, how to effectively control product of Hg in the coal gas has become extremely important. Although metal oxide-supported noble metal nanoparticles has proven effective for removing Hg from the simulated coal gas, the conventional oxide-supported metal catalysts often suffer from sole function of metal oxide support, small surface area, low loading amount and poor dispersibility of the noble metal particles on the oxide support, leaching of metal nanoparticle from oxide support during reaction, and poor recyclability of composite nanoparticles. These drawbacks have prompted us to develop a robust catalyst for highly efficient removal of Hg in the gasification process. Herein, In this project we will introduce a facile synthesis route to load subnanoscale Pd nanoparticles on γ-Fe2O3 hollow magnetic nanoparticles with a large specific surface area, long-term stability and further investigate the reaction mechanism and actual active phase between subnanoscale Pd/γ-Fe2O3 and Hg. Thus we could develop an efficient method to removal the harmful heavy metal mercury from coal gas.