摘要催化氧化NO是现阶段煤烟气脱硝技术研究的主要方面之一,本论文采用非金属掺杂铈钛固溶体作为载体,负载到Cr上制备出催化剂,通过实验判断其催化氧化NO性能的优劣,并通过各种表征手段来解释说明其原因及反应机理。27621
首先,我们通过改变非金属的掺杂量,来确定最佳摩尔比,并在不同温度下测得其活性与选择性,结果发现在Cr/CeTi-C摩尔比为1.2时,催化效果最佳,360℃为该催化剂的最佳反应温度。然后通过XRD,H2-TPR,XPS, BET,EPR,红外等表征分析,来解释说明其催化性能较好的原因:主要是因为非金属N主要掺杂到Ce中,少量掺杂到Ti中,形成氧空位,促进晶格氧形成化学吸附氧,提高脱硝效率,并推测出其反应机理。
关键词 NO 非金属 铈钛固溶体 Cr 催化氧化
毕业论文设计说明书外文摘要
Title Catalytic performance research of NO oxidation based on Cr/CeTi-C catalyst
Abstract
Catalytic oxidation NO is one of the main aspects of flue gas denitrification technology at present stage ,this paper uses Cerium titanium solid solution as a carrier, the load on Cr to prepare the catalyst ,through the experiment judge the pros and cons of the catalytic oxidation of NO performance and through a variety of characterization methods to explain the causes and the reaction mechanism.
First, we changed the amount of doping non-metallic to determine the optimum molar ratio, and measured the activity and selectivity at different temperatures.we found that the catalytic effect is the best in Cr/CeTi-C ratio of 1.2,and the best reaction temperature of the catalyst is 360 ℃. And then we through XRD, H2-TPR, XPS, BET, EPR to explain the advantage of the catalyst : mainly because non-metal doped N mainly to the Ce, a small amount of it doped in the Ti.The formation of oxygen vacancies ,promoted that lattice oxygen translated into chemisorption chalcogen improve denitration efficiency, and infer its reaction mechanism.
Keywords Nitric oxide Nonmetal Cerium titanium solid solution Cr oxides Catalytic oxidation
目 录
1.引言 1
1.1课题研究背景与意义 1
1.1.1氮氧化物危害 1
1.1.2氮氧化物控制技术 1
1.2选择性催化氧化技术 1
1.2.1催化氧化方法 2
1.2.2催化氧化催化剂 2
1.2.3 NO催化氧化研究进展 2
1.3论文的研究思路和研究内容 3
1.3.1研究现状 3
1.3.2研究思路 3
1.3.3研究内容 4
2.Cr/CeTi-C催化剂的制备及性能研究 5
2.1实验试剂和主要仪器 5
2.2溶胶凝胶法Cr/CeTi-C催化剂的制备 6
2.2.1载体制备 6
2.2.2催化剂制备 6
2.3催化剂的活性测试 7
2.4催化剂的表征手段 8
2.5结果与讨论 9
2.5.1催化剂活性测试 9
2.5.2 XRD 11
2.5.3红外(FTIR) 11
2.5.4 BET数据分析 12
2.5.5扫描电镜(SEM) 14
2.5.6 H2-TPR 14
2.5.7 XPS 15
2.5.8 EPR 17
2.5.9原位红外(DRIFTS) 18
2.6本章小结 19
3确定非金属元素具体掺杂位点 20 基于Cr负载的非金属掺杂铈钛固溶体的催化NO性能研究:http://www.youerw.com/huaxue/lunwen_22144.html