摘要
中国煤制乙二醇行业迅速发展,主要采用草酸酯合成工艺。但该工艺乙二醇尾气装置排放的亚硝酸甲酯(MN)和NO_(x)对健康有害。研究了利用H_(2)作为还原剂选择性催化还原(H_(2)-SCR)处理草酸酯合成法制乙二醇尾气中的NO_(x)。采用浸渍法分别以CeO_(2)、TiO_(2)、Al_(2)O_(3)、SiO_(2)、ZSM-5、ZnO、MoC和活性炭为载体制备负载铂(Pt)系催化剂,并考察其在不同温度、压力和空速条件下的脱硝性能。结果表明,在催化剂装填量为15 mL、原料气NO和CO体积分数为8%的条件下,以CeO_(2)为载体,负载Pt型催化剂在反应温度220~260℃、压力0.1~0.4 MPa、空速300~1000 h^(-1)时,尾气NO、NO_(x)、CO、CH_(4)含量均符合国家排放标准,且在500 h长周期运行和500℃高温下表现出良好的稳定性。
The coal-to-ethylene glycol industry in China has developed rapidly,mainly adopting the oxalate ester synthesis process.However,the methyl nitrite(MN)and NO_(x) emitted from the ethylene glycol tail gas unit of this process are harmful to health.The treatment of NO_(x) in the tail gas of ethylene glycol produced by the synthesis of oxalate esters using H_(2) as the reducing agent through selective catalytic reduction(H_(2)-SCR)was studied.Pt-based catalysts were prepared by impregnation method using CeO_(2),TiO_(2),Al_(2)O_(3),SiO_(2),ZSM-5,ZnO,MoC and activated carbon as carriers respectively,and their denitrification performance under different temperatures,pressures and space velocities were investigated.The results showed that under the conditions of catalyst loading volume of 15 mL and a volume content of NO and CO in the feedstock gas of 8%,when the TMN-5 catalyst operates at reaction temperature of 220~260℃,pressure of 0.1~0.4 MPa,and space velocity of 300~1000 h^(-1),the contents of NO,NO_(x),CO,and CH_(4) in the exhaust gas all meet the national emission standards.Moreover,the catalyst has good stability in 500 h long-term operation and at high temperature of 500℃.
作者
卞雯
吴鹏
吕君君
BIAN Wen;WU Peng;L Junjun(The Northwest Chemical Research Institute Co.,Ltd.,Xi’an 710061,Shannxi,China)
出处
《工业催化》
2025年第6期96-100,共5页
Industrial Catalysis
作者简介
通讯联系人:卞雯,1987年生,女,陕西省西安市人,硕士,高级工程师,研究方向为工业催化。E-mail:928247373@qq.com。
