摘要
将预先经酸处理的铝钛硅(ATS)多相陶瓷片先后负载Al0.2Ti0.6Zr0.2O1.9复合氧化物与CeO2活性组分,制得新型CeO2/Al0.2Ti0.6Zr0.2O1.9/ATS复合脱硝催化剂。运用X射线衍射(XRD)、扫描电镜(SEM)手段对该催化剂进行表征,研究催化剂的晶相、微观形貌。评价了催化剂的脱硝活性,研究了H2O和SO2对其脱硝活性的影响。实验结果表明,CeO2/Al0.2Ti0.6Zr0.2O1.9/ATS具有良好的脱硝活性,高活性温度窗口在100～350℃,当反应温度为250℃时,NO的转化率达98.49%。SO2和H2O在一定程度抑制该催化剂的低温脱硝活性,但随着温度的升高,其脱硝活性逐渐恢复。催化剂中活性组分CeO2具有储硫作用,当有SO2存在时,活性温度窗口向高温区偏移了100℃,在250～400℃时,H2O的存在反而提高了催化剂的脱硝活性。
The Al0.2Ti0.6Zr0.2O1.9 composite oxide was synthesized by improved sol-gel method,and then the cerium was supported on the composite oxide to prepare the composite denitrification catalyst CeO2/Al0.2Ti0.6Zr0.2O1.9/ ATS. The composite denitrification catalyst was characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Catalytic denitrification activity of CeO2/Al0.2Ti0.6Zr0.2O1.9/ATS was evaluated, and the effects of Hz O and SO2 on reduction of NO were mainly studied. Results showed that CeO2/Al0.2Ti0.6Zr0.2O1.9/ATS had a perfect catalytic activity with a wide catalytic activity temperature window （100-350 ℃ ）,and NO conversion rate reached 98.49 % at reaction temperature of 250 ℃. The presence of H2O and SO2 inhibited the catalytic denitrification activity of CeO2/Al0.2Ti0.6Zr0.2O1.9/ATS at low temperature, while the deactivation was reversed with increasing the temperature. Because the sulfur storage function of CeO2 ,the catalytic activity temperature window of the catalyst was transferred toward high temperature about 100 ℃ with the presence of SO2, and H2O（10%） improved denitrification activity of catalyst at 250-400 ℃.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2010年第5期30-33,51,共5页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.50872052)
关键词
脱硝
催化剂
抗硫
抗水
denitrification
catalyst
sulfur-resistance
water-resistance
