Investigation of carbon monoxide gas adsorption on the Al2O3/Pd(NO3)2/zeolite composite film

• Published in: Journal of theoretical and applied physics 2020-03, Vol.14 (1), p.65-74
• Main Authors: Mozaffari, Nastaran, Haji Seyed Mirzahosseini, Alireza, Sari, Amir Hossein, Fekri Aval, Leila
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Aluminum oxide; Applied and Technical Physics; Atomic; Carbon monoxide; Condensed Matter Physics; Emission analysis; Field emission microscopy; Field emission spectroscopy; Gas analyzers; Medical and Radiation Physics; Molecular; Nanoscale Science and Technology; Optical and Plasma Physics; Particle diffusion; Physics; Physics and Astronomy; Reaction time; Regression analysis; Regression coefficients; Regression models; Roller coating; Zeolites
• ISSN: 2251-7227; 2251-7235
• DOI: 10.1007/s40094-019-00360-6

In this study, Al 2 O 3 /Pd(NO 3 ) 2 /zeolite composite films have been fabricated by roll coating method and characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy and field emission scanning electron microscopy. The gas adsorption was tested in an experimental setup by a continuous gas analyzer KIMO KIGAZ 210 at constant temperature and pressure (32 °C and 1.5 bar) and as a function of reaction time (s). The inlet CO gas concentration was 150 mg L −1 , and the saturation level of CO gas concentration was 5 mg L −1 . The maximum adsorption capacity ( q max ) and maximum adsorption efficiency (%) were calculated as 111.16 mg g −1 and 97%, respectively. Pseudo-first-order, pseudo-second-order, and intra-particle diffusion models were investigated to kinetic study of CO adsorption on Al 2 O 3 /Pd(NO 3 ) 2 /zeolite adsorbents. Results indicated that CO adsorption follows the pseudo-second-order model well according to regression coefficient value ( R 2  = 0.98), and the value of pseudo-second-order rate constant of adsorption was obtained as 2 × 10 −5  g mg −1  s −1 . According to the intra-particle diffusion model, adsorption is affected by only one process. So, adsorption of CO by Al 2 O 3 /Pd(NO 3 ) 2 /zeolite adsorbent indicated an effective adsorption by obtained results.