鋯摻雜對(duì)介孔二氧化鈦催化性能的優(yōu)化-展示頁
2025-07-06 16:20本頁面
【正文】 ABSTRACTA series of titania whiskers and TiZr posite oxides were prepared by sol?gel method. Optimization of catalytic properties for mesoporous titania by doping zirconium was investigated. Effects of doping zirconium on crystal form, grain morphology, specific surface area and solid acidity of titania were characterized by Xray diffraction (XRD), scanning electron microscopy (SEM), energy disperse spectra (EDS), Fourier infrared spectroscopic analysis (FTIR) with NH3 as atom probe and N2 physical adsorption (BET method). The results show that doping zirconium could prohibit crystal transformation from anatase to rutile, change the grain morphology, enhance the solid acidity and increase the specific surface area of titania. Consequently’the catalytic properties of titania were optimized. In the process of selective catalytic reduction of NO, with TiO2 as denitration catalyst and NH3 as reducing agent, doping zirconium widened the catalytic temperature range to high temperature by 50100oC, and the biggest catalytic activity in the experimental temperature range walt improved by %.Key words: mesoporous titania；sol gel；zirconium doping；deNOx 第1章 前言銳鈦礦型TiO2因其特殊的能帶結(jié)構(gòu)作為環(huán)保催化材料已日益受到人們的關(guān)注[1,2]。然而，銳鈦礦型TiO2易向金紅石犁TiO2轉(zhuǎn)變，銳鈦礦晶型的不穩(wěn)定性商接導(dǎo)致TiO2催化性能的急劇下降。TiO2轉(zhuǎn)變?yōu)榻鸺t石的溫度決定于制備方法、煅燒時(shí)的氣氛性質(zhì)及所含雜質(zhì)離子的種類等因素。若存在Zn2+、A13+、Nb5+、Cl、SO4PO43等雜質(zhì)會(huì)妨礙轉(zhuǎn)化、提高轉(zhuǎn)化溫度[l0]。并考察鋯摻雜對(duì)介孔TiO2作為脫硝催化劑選擇性催化還原NO的影響。再以“：瑋為52：37，將A液緩慢滴入B液中，經(jīng)磁力攪拌器室溫中速攪拌50 min，即制得均勻的略帶黃色的透明鈦溶膠。在上述鈦溶膠配制過程中，待A、B混合溶液經(jīng)磁力攪拌器攪拌20 min后， g氧氯化鋯(AR，國(guó)藥化學(xué)集團(tuán)有限公司)，繼續(xù)攪拌30 min，即制得鈦鋯復(fù)合溶膠。樣品的物相采用日本理學(xué)RigakuD max/RB型X射線衍射(XRD)儀進(jìn)行分析，掃描范圍為50～80。(江南光學(xué)儀器廠)觀測(cè)樣品的微觀形貌。樣品的比表面積及孔徑分布采用美國(guó)Micro—meritics公司的ASAP ，液N2低溫吸附，BET法測(cè)定，測(cè)試條件為90℃，1 h，350℃，4h。NI13的吸附紅外在BruckerIFS66V FTIR光譜儀上測(cè)定。然后進(jìn)行樣品掃描，將第二次所得譜圖
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