光催化氧化同时脱硫脱硝的实验研究_图文_百度文库.

(IC

、光电子能谱

( XPS

及产物的化学分析表明

,

光催化 脱硫脱硝产物为硫酸盐和硝

酸盐

,S 02

和

NOx

光催化反应脱除的机理是 光催化氧化过程。

BP

神经网络模型预

测光催化脱硫脱硝效率达到了较高的精度。

< br>关键词

:

光催化

,

同时脱硫脱硝

,

纳米

Ti0 2

催化剂

,

机理

摘要

Abstract

A new approach and principle of S02and NOx simultaneous removal from flue gas

was presented by this experriment,Ti02supported photocatalyst

Was prepared

晰

th quartz sand particles,and using the removal of simulative

802and NOx flue gas,photocatalytic degradation experiment Was carried out on the self-

made photoreactor at high concentration influencing factors were investigated

in chemical and micro-structure analysis on the products of the desulfurization

and the denitrification reactions were analysed,the mechanism of simultaneous

desulfurization and denitrification by photocatalytic oxidation was the basis

of the experimental results,the desulfurization model and the denitrification model were

proposed.

Ti02supported photocatalyst was prepared by liquid

—

phase deposition method,and

modification and regeneration of Ti02photocatalyst was performance of Ti02

photocatalyst Was characterized by SEM,TEM, anatase Ti02exiSted

and the particle size of no-doped

and doped Ti02photocatalyst were 21.8nm and 17.5nm,

photocatalytic activity of Ti02photocatalyst Was evaluated by degradation of methylene

blue.

Under UV irradiation,photolysis and oxidation of 802couldnot occured and could be

absorbed by irradiation,presence of 02,initial concentration,

temperature,humidity WaS most essential factors to photocatalytic oxidiation of

photocatalytic oxidation was primary in the removal process of S 02

。

Under optimum

expefimental conditions,the higher removal efficiency of S 02with no-doped and doped

Ti02photocatalyst was 96%and 100%,respectively.

NOx could be adsorbed by Ti02photocatalyst in the dark,and had no photolysis and

oxidation under UV ce of 02and initial concentration improved the

removal efficiency of certain temperature and humidity range,to no

—

doped and

doped Ti02photocatalyst,the removal efficiency for NOx was obstained about 49%and

53.2%,respectively.

The presence of 802and NOx,physical adsorption was mainly without UV

certain concentration range,the removal of 802and NOx had a promotion

for each this experiment,oxygen was sufficient and the removal efficiency of

802and NOx was obstained over 80%and 40%, humidity increasing, the

removal efficiency of S02was increased,reached to 100%,and that of NOx declined. The

main products of the desulfurization and denitrification reactions were sulfate and nitrite

lI

华北电力大学博士学位论文

by the analysis of EDS

、

IC and the basis of above results,the mechanism

of desulfurization and denitrification was the process of S02and NOx photocatalytic

oxidation. BP nerve network model was proposed for the predict of the removal

efficiency of S02and NOx,and a better precision was obstained.

Key words:photocatalytic oxidation,simultaneous desulfurization and

denitrification,Ti02 photocatalyst,mechanism

III

声

尸

明

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:

此处所提交的博士学位论文《光催化氧化同时脱硫脱硝的实验

研究》

,

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,

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