改性柱撑黏土用于烟气脱硝的研究进展

Review on denitrification mechanism of modified pillared clays

柱撑黏土(PILC)由于其结构可控的二维层状多孔特性,在选择性催化还原(SCR)技术中已得到广泛应用。本文综述了近年来PILC和改性PILC的结构特性、化学性质、层间掺杂活性物质及脱硝效率的研究成果,分析表明,经过添加不同活性物质改性后的PILC具有更高的比表面积、更大的层间距和良好的耐热稳定性等特点,催化剂的表面活性及催化活性得到明显的提高,对NOx具有更好的脱除效果。此外,本文还介绍了基于密度泛函理论(DFT)的改性PILC的吸附机理研究进展。由此指出,对PILC的改性和理论的深入研究,为设计和改造高效SCR脱硝催化剂具有重要意义,而将密度泛函理论引入PILC改性及脱硝机理研究中也为PILC的改性研究提供了新的理论思路。

Pillared clay(PILC)has been widely used in selective catalytic reduction(SCR)technology due to its controllable two-dimensional layered porous properties.In this paper,the recent research results on the structural characteristics,chemical properties,interlayer doped active materials and denitration efficiencies of PILC and modified PILC were summarized.The analysis results show that modified PILC with the addition of different active materials has higher specific surface area,larger interlayer distance and good thermal stability.The surface activity and catalytic activity of the catalyst are significantly improved,and so is the NOx removal efficiency.In addition,the research progress of the adsorption mechanism of the modified PILC based on density functional theory(DFT)is also introduced.It can be seen that the in-depth study of the modification of PILC is of great significance for the design and transformation of high-efficiency SCR denitration catalysts.The introduction of DFT provides a new theoretical tool for the modification of PILC.