In situ Synthesis of Cu-SAPO-34/Cordierite for the Catalytic Removal of NOx from Diesel Vehicles by C3H8
✍ Scribed by Zhiqiang LIU; Lei TANG; Liping CHANG; Jiancheng WANG; Weiren BAO
- Book ID
- 104452955
- Publisher
- Elsevier Science
- Year
- 2011
- Weight
- 784 KB
- Volume
- 32
- Category
- Article
- ISSN
- 1872-2067
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✦ Synopsis
A Cu-SAPO-34/cordierite catalyst was prepared by in situ hydrothermal synthesis. The morphology and structure of the Cu-SAPO-34/cordierite samples were characterized by X-ray diffraction, scanning electron microscopy, and physical adsorption-desorption analyzer. The removal of NO x from simulated diesel vehicle exhaust gas was carried out using a fixed-bed reactor. The effects of C 3 H 8 , O 2 concentrations, and water vapor on the activity of the catalyst were studied. The results indicate that the Cu-SAPO-34 coatings obtained by the in situ synthesis are firm and compact, and the loading amount was found to be more than 20% after one synthesis operation. The surface areas of the Cu-SAPO-34/cordierite catalysts increase greatly compared with that of cordierite. The active Cu component prepared through in situ synthesis can significantly improve the activity of selective catalytic reduction of NO x by C 3 H 8 . NO x reduction over the Cu-SAPO-34/cordierite catalyst is more than 60% between 500 and 650 °C. The NO x conversion decreases after the addition of 10% water vapor to the feed gas but the deactivation caused by water vapor is not permanent.