Cu-SAPO-34/堇青石的原位制备及其催化丙烷还原柴油机车尾气中NOx

催化学报 , 2011, 32(4): 546-554. doi: 10.1016/S1872-2067(10)60205-7

Cu-SAPO-34/堇青石的原位制备及其催化丙烷还原柴油机车尾气中NOx

刘致强 ^1, , 唐磊 ^2, , 常丽萍 ^3, , 王建成 ^4, , 鲍卫仁 ^5,

1.太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原,030024

2.太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原,030024

3.太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原,030024

4.太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原,030024

5.太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原,030024

基金项目: 国家自然科学基金(20906067) 山西省科技基础条件平台建设项目(2010091015)

关键词：铜 , SAPO-34分子筛 , 堇青石 , 氮氧化物 , 丙烷 , 原位合成 , 选择性催化还原 , 柴油机

In Situ Synthesis of Cu-SAPO-34/Cordierite for the Catalytic Removal of NOx From Diesel Vehicles by C3H8

采用原位水热法制备了Cu-SAPO-34/堇青石整体式催化剂,运用X射线衍射、扫描电镜和N2吸附-脱附等技术对其进行了表征,并在固定床反应器上评价了其催化丙烷还原模拟柴油机车尾气中NOx性能,考察了丙烷和O2浓度以及水蒸气对催化剂性能的影响.结果表明,所制整体式催化剂中Cu-SAPO-34涂层与载体结合牢固紧密,经一次操作Cu-SAPO-34负载量大于20%,且其比表面积较载体显著增加.另外,Cu的加入能显著提高催化剂上丙烷选择性催化还原NOx的活性,在500～650°CNOx浓度可降低60%以上.当原料气中添加10%水蒸气后,NOx转化率有所降低,但停加水蒸气后,催化剂活性可部分恢复.

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