【作者】 郑军伟；

【导师】 张孝彬； 杨杭生； 曾令芳；

【作者基本信息】 浙江大学 ， 材料科学与工程， 2012， 硕士

【摘要】 随着国民经济的发展和人民生活水平的提高,日益恶化的环境已经引起了全世界的关注。氮氧化物(NOx)和二恶英作为两个主要的污染物,对人类和环境有着巨大的危害。选择性催化氧化/还原技术(SCR)是最有效的减排控制技术。当前,低温高效SCR的研发已经成为了国际研究的热点。在本研究小组成功研究出具有自主产权的低温SCR催化剂基础上,本论文主要研究此类催化剂的同时脱硝脱氯苯性能以及该催化剂的成型、中试应用。主要研究内容包括：(1)用溶胶凝胶法制得Mn-Ce/Ti-CNTs催化剂,其涂覆在铝片上之后显示了很好的同时脱除CB和NOx的性能。在250度时,CB和NOx脱除效率可以达到95%以上。(2)对实验室制备出来的SCR催化剂进行了板状以及蜂窝状的成型实验。当有机黏土、水泥和硅酸钠之间比例为最佳时,板状催化剂具有较高的强度、较好的抗水性以及优良的NOx脱除效果。各种添加剂以一定的比例与我们的催化剂混合,挤出成型,制得具有较高机械强度以及较好SCR性能的蜂窝状催化剂。(3)对实验室制备出来的SCR催化剂进行脱硝中试及应用。结果显示：当烟气速率远远超过6m/s的时候,催化剂的脱硝效率可以达到74%,而当烟气的速率降低至4-6m/s时,脱硝效率则可以达到85%。同时,我们还成功的制备出了较为满意的新型的板状催化剂,该板式催化剂的脱硝测试过程正在进行中。更多还原

【Abstract】 With the development of national economy and the improvement of living standards, the deteriorating environment has attracted world wide attention. Nitrogen oxides and dioxins are the two most important pollutants. They have a great deal of harm to humans and the environment. Selective catalytic oxidation/reduction technology is the most effective kind of processing to reduce their emissions. Now, the research and development of high efficiency catalyst for low temperature SCR has been a top priority.The research team has successfully developed a low temperature SCR catalyst with independent property rights. For the studied catalysts, the CB and NOx removal efficiencies have been studied. The forming.testing and application of the catalyst also have been studied.(1) We coat Mn-Ce/Ti-CNTs catalyst prepared by sol-gel on the aluminum plates. They have displayed the outstanding performance of simultaneous removal of CB and NOX. The CB and NOX removal efficiencies are 95% or more at 250℃.(2) For the SCR catalyst prepared by sol-gel in the laboratory, the plate, honeycomb molding experiments have been conducted. When the ratio among binder, cement and sodium silicate added to the catalyst is the best, the catalyst has high mechanical strength, anti-water conditions and excellent de-NOx efficiency. Various additives are mixed to our catalyst by a certain proportion, then, we obtain the honeycomb catalyst having high mechanical strength and good SCR performance by extrusion molding.(3) For the SCR catalyst prepared by sol-gel in the laboratory, the denitrification testing and pilot application have been conducted. When the velocity of flue gas is far more than 6m/s, NOx removal efficiencies are 74%. When the velocity of flue gas is 4-6m/s, NOx removal efficiencies are 85%. We also successfully prepared a new kind of the plate catalysts. For this kind of plate catalysts, the testing of NOx removal efficiencies are under way.更多还原