蜂窝状微量贵金属催化剂对几种典型VOCs的催化氧化性能

研制出了用于催化氧化废气中挥发性有机化合物(VOCs)的蜂窝状微量贵金属催化剂.用浸渍法制备催化剂Pt-Ce-La-Zr/Al2O3,并在自行设计的活性检测系统上,对用该催化剂净化含有苯、甲苯、乙醇、正己烷的模拟废气进行了研究,考察了空速、质量浓度等因素对催化剂活性的影响.实验结果表明,该催化剂对上述几种典型的VOCs气体都具有较低的起燃温度,其催化转化活性较好.     

层柱粘土催化剂在SCR烟气脱硝中的应用

电站锅炉排放的氮氧化物（NOx）是大气污染的主要来源之一,对人类的健康构成了极大的威胁。在我国燃煤电站中,大多采用低NOx燃烧技术,而脱硝效率较高的选择性催化还原（SCR）技术则应用较少。随着我国NOx排放标准的日益严格,SCR技术将会在我国获得较大的发展。在SCR技术的应用过程中,催化剂的制备生产是其中最重要的组成部分,其催化性能直接影响到SCR系统的整体脱硝效果。层柱粘土（Pillared Interlayer Clays,PILC）催化剂,是近年来国际上正在大力研究开发的一种新型催化材料,具备非常优异的催化性能。我国拥有丰富的膨润土资源,它是制备层柱粘土的主要原料。研究层柱粘土催化剂对于我国的环保产业及非金属矿业的发展具有重要意义。     

介孔ZnO负载Fe-Cu-Zr复合催化剂用于催化燃烧降解乙酸丁酯

采用醇热法制备了有序球状介孔ZnO负载Fe-Cu-Zr复合催化剂,应用BET、SEM、XRD、XPS等对不同物质的量比催化剂进行了表征,研究了催化降解乙酸丁酯的活性及其影响因素,并推测了降解机理.结果表明,铁铜锆复合催化剂颗粒均匀,分散性较好,孔径大部分小于50 nm,比表面积为46~68 m²·g^-1.各活性成分能够共存和协同发挥作用,铁、铜、锆离子吸附在氧化锌晶胞内,粒子间量子作用力促使晶胞表面积略有变大.锆能够提高3种活性成分间的作用力,可以调节表面电子密度,促使结合能向低的方向偏移,增强催化剂的氧化还原能力.随着锆比例的增大,催化剂的活性也随之增强;随着初始浓度、空速、相对湿度的增加,乙酸丁酯降解效率均有所下降.在乙酸丁酯初始浓度为2590 mg·m^-3、空速为9000 h^-1的工况下,ZnO-3M催化剂降解乙酸丁酯的T₅₀为116 ℃,T₉₀为200 ℃,270 ℃时CO₂转化率达96%,具有良好的低温催化活性和稳定性.乙酸丁酯催化氧化主要中间产物为少量的低级酸和低碳醇,最后被彻底氧化成CO₂和H₂O.     

A review on sustainable reuse applications of Fenton sludge during wastewater treatment

• The sustainable approaches related to Fenton sludge reuse systems are summarized. • Degradation mechanism of Fenton sludge heterogeneous catalyst is deeply discussed. • The efficient utilization directions of Fenton sludge are proposed. The classical Fenton oxidation process (CFOP) is a versatile and effective application that is generally applied for recalcitrant pollutant removal. However, excess iron sludge production largely restricts its widespread application. Fenton sludge is a hazardous solid waste, which is a complex heterogeneous mixture with Fe(OH)₃, organic matter, heavy metals, microorganisms, sediment impurities, and moisture. Although studies have aimed to utilize specific Fenton sludge resources based on their iron-rich characteristics, few reports have fully reviewed the utilization of Fenton sludge. As such, this review details current sustainable Fenton sludge reuse systems that are applied during wastewater treatment. Specifically, coagulant preparation, the reuse of Fenton sludge as an iron source in the Fenton process and as a synthetic heterogeneous catalyst/adsorbent, as well as the application of the Fenton sludge reuse system as a heterogeneous catalyst for resource utilization. This is the first review article to comprehensively summarize the utilization of Fenton sludge. In addition, this review suggests future research ideas to enhance the cost-effectiveness, environmental sustainability, and large-scale feasibility of Fenton sludge applications.