Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 209, Issue -, Pages 1016-1026Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.09.045
Keywords
Selective catalytic oxidation of ammonia; Hollow ZSM-5; Ag-0 species; Metal-encapsulated
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Funding
- National Natural Science Foundation of China [21607162, 21676287, 21761132006]
- Doctoral Fund of Shandong Province [BS2015HZ003]
- Qingdao Indigenous Innovation Program [16-5-1-27-jch]
- Open Foundation of Key Laboratory of Industrial Ecology and Environmental Engineering, MOE [KLIEEE-15-05]
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Hollow ZSM-5 encapsulating Ag particles (Ag/ZSM-5-OH) have been successfully synthesized, characterized and tested in NH3-SCO reaction. In comparison with Ag/Al2O3 and Ag/ZSM-5-OH, Ag/ZSM-5 catalyst displayed the lowest T-100 (110 degrees C), much higher TOF and the lowest E-a. Although fresh Ag/ZSM-5-OH catalyst showed the relatively low NH3 conversion, its reaction cycles stability was significant higher than that of Ag/Al2O3 and Ag/ ZSM-5 catalysts. The hollow structure of ZSM-5 zeolite could prevent sintering and/or leaching of Ag particles during NH3 oxidation process. Zeolite membrane formed during dissolution-recrystallization process in the surface of hollow ZSM-5 could offer good separation properties for SO2. So SO2 did not diffuse into the hollow structure to be poisoned Ag catalyst, finally induced the outstanding SO2/H2O resistance.
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