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

محورهای موضوعی : Journal of Theoretical and Applied Physics

Nastaran Mozaffari ¹ , Alireza Haji Seyed Mirzahosseini ² , Amir Hossein Sari ³ , Leila Fekri Aval ⁴

1 - Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University
2 - Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University
3 - Plasma Physics Research Center, Faculty of Sciences, Science and Research Branch, Islamic Azad University
4 - Plasma Physics Research Center, Faculty of Sciences, Science and Research Branch, Islamic Azad University

تاریخ انتشار : 1398/12/11

کلید واژه: Carbon Monoxide, Adsorption, Zeolite, Palladium II nitrate, Alumina, Kinetic study,

چکیده مقاله :

AbstractIn this study, Al2O3/Pd(NO3)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 (qmax) 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 Al2O3/Pd(NO3)2/zeolite adsorbents. Results indicated that CO adsorption follows the pseudo-second-order model well according to regression coefficient value (R2 = 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 Al2O3/Pd(NO3)2/zeolite adsorbent indicated an effective adsorption by obtained results.