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Enhancement of Nox Adsorption Performance on Zeolite Via a Facile Modification Strategy

SSRN, ISSN: 1556-5068
2022
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    1
    • Citation Indexes
      1
  • Usage
    270
    • Abstract Views
      231
    • Downloads
      39
  • Captures
    1

Article Description

Adsorption is a promising technology for simultaneously capturing nitrogen oxides (NOx) from flue gases and recycling NO2 as a profitable chemical, for which a robust and efficient adsorbent provides the key step for success in practical applications. This work reports the enhancement of NOx adsorption performances with less cost of desorption energy on Cu-ZSM-5 zeolites modified by incipient-wetness impregnation coupled with microwave drying (Cu-ZSM-5_IM), in comparisons to H-ZSM-5, Na-ZSM-5 and conventionally liquid-phase ion-exchanged Cu-ZSM-5. The Cu-ZSM-5_IM renders record NOx adsorption capacity (qt,NOx) of 0.878mmol/g on zeolites from dry gas stream at sub-1000 ppm feed concentrations and room temperatures, and applicable qt,NOx of 0.1mmol/g from wet gas stream (42%RH at 298 K) with a moderate loading mass of copper (2.1%wt corresponding to ion exchange rate of 55%). The temperature programmed desorption of NOx on the optimal Cu-ZSM-5_IM saturated with NOx from wet gas stream exhibit primary peak temperature (~600 K) lower than reported Cu-ZSM-5 (~698 K) and NO2 as main component (72.6%) in desorbed NOx, which are beneficial for recycling in practice. Deeper insights into advantageous oxidative adsorption of NOx from CO2/N2/O2/H2O gas mixture on Cu-ZSM-5_IM with the rapid (≤700 s) and facile modification are discussed based on in-situ FTIR characterizations.

Bibliographic Details

Yingshu Liu; Xiaoyong Wu; Ziyi Li; Haiyang Tao; Xiong Yang; Jinjuan Li; Chuanzhao Zhang; Ralph T. Yang

Elsevier BV

Multidisciplinary; Nitrogen oxides; adsorption; desorption; zeolite; incipient-wetness impregnation

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