钾基玻璃态催化剂及其对颗粒物的氧化性能

摘要

The effect of different potassium (K) contents on the binding properties of a catalyst to the support and the catalytic oxidation of soot were investigated to develop a catalyst for efficient removal of soot particulate matter (PM) from diesel exhaust. K-based glassy ceramic coatings were prepared by sol-gel method using NiCrFe alloy corrugated foil as carrier. The commercial carbon black was substituted for the actual diesel soot by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) analysis and catalytic activity test to simulate the leaching of potassium ions escape speed. The results show that K-based glassy ceramic coating can effectively inhibit the leaching rate of K+and improve the catalytic oxidation performance of the catalyst on soot. The (K2O)0.5(Al2O3)0.5(SiO2) yielded the best catalytic results and exhibited 90% of soot conversion at 540 ℃ under loose contact conditions.%为开发高效去除柴油车尾气碳烟颗粒物(PM)的催化剂,研究了不同钾含量对催化剂与载体结合性能以及碳烟催化氧化性能的影响.以NiCrFe合金波纹箔片为载体,采用溶胶-凝胶法制备K基玻璃态催化剂.使用X射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)分析、催化活性测试等手段,以商业炭黑代替实际的柴油机碳烟,模拟柴油机湿热排气条件,考察钾离子(K+)的浸出速度.结果表明:钾基玻璃态陶瓷涂层有效地抑制了K+的浸出速度,改善了催化剂对柴油机的碳烟催化氧化性能.(K2O)0.5(Al2O3)0.5(SiO2) 获得最好的催化结果,松散接触条件下,在540 ℃下显示出90%碳烟转化率.