新型分子筛催化剂对氮氧化物的分解与还原

【作者】 栾敏杰；

【导师】 袁福龙；

【作者基本信息】 黑龙江大学 ， 无机化学， 2006， 硕士

【摘要】 随着人类对可持续发展战略认识的不断深入，环境污染和防治问题已引起了世界各国的高度重视。因此，消除作为大气污染主要来源之一的氮氧化合物（NOx，以NO和NO₂为主要空气的污染物，其中NO占95％）就变得尤为重要。 本论文以介孔分子筛SBA-16作为催化剂载体，通过浸渍法制备了一系列不同负载量的分子筛催化剂：Cu／SBA-16，Fc／SBA-16，CuPd／SBA-16，FePd／SBA-16。采用催化还原和直接分解两种方式，分别考察了不同催化剂对氮氧化物的转化能力。分别以丙稀、甲烷作还原剂考察它们催化还原氮氧化物的能力。同时，还制备了一系列贵金属催化剂：Pd／SBA-16，Ru／SBA-16，Ag／SBA-16。考察直接分解条件下对氮氧化物的转化能力。并对制备方法、制备条件（pH值、焙烧方式）等影响因素进行了分析。 采用X射线衍射（XRD）、和红外（IR）、比表面积（BET）、氢气程序升温脱附（H₂-TPR）等表征方法对催化剂样品的晶相结构、表面形态、金属的价态等性质进行了分析。更多还原

【Abstract】 Along with the understanding to the sustainable developmental strategy, the question of the environmental pollution, preventing and controlling are regarded as urgent affair by the various countries. Therefore, the removal of NO_x （NO as well as NO₂ are main air pollutant, NO accounts for 95%） became very important. The traditional three-way catalyst would be ineffective under lean-burn condition, so a new type of catalyst for under lean-burn condition is urgently needed to be developed.In this dissertation, catalytic reduction and direct decomposition of NO are investigated over SBA-16 modified by different mental. A series of Cu（Pd）/SBA-16 and Fe（Pd）/SBA-16 catalysts are prepared by wet impregnation method using SBA-16 as support. The catalytic performance of these samples in NOx reduction with C₃H₈ or CH₄ is investigated. The other series of noble metal catalysts are also prepared by impregnation in different concentration of Mⁿ⁺ solution. The activity of these catalysts is discussed for the direct decomposition of NO. And the influence factors of catalytic activity are also studied, such as the method of prepare catalysts, pH and means of calcined catalysts.Catalysts are characterized by XRD, IR, H₂-TPR, ESR etc., which are in flavor of understanding the crystal structure, surface characteristics and surface active species.更多还原