NO2 catalytic removal by nickel catalyst supported on multi-walled carbon nanotubes

Abstract

ABSTRACT In this study, nickel-based catalyst supported on multi-walled carbon nanotube (Ni/MWCNT) was synthesized and used in NO2 removal from polluted air. Scanning Electron Microscopy (SEM) and Energy Distribution Spectrum (EDS), X-Ray Diffraction (XRD) and H2-Temperature-Programmed Reduction (H2-TPR) were used to determine the characteristics of the synthesized Ni/MWCNT catalysts and multi-walled carbon Nanotube. To Optimize the catalytic process, the effects of space velocities (15,000–25,000 hr−1), NO2 concentrations (3000–5000 ppm) and temperatures (150–450°C) were investigated on the NO2 removal efficiency. The highest NO2 removal efficiency was 96% by using 20% Wt of nickel-based supported on the MWCNT (20% Ni/MWCNTs) at temperature of 450°C, NO2 concentration of 3000 ppm and space velocity of 15,000 hr−1. Our findings indicated that increasing space velocity from 15,000 to 25,000 hr−1 did not have a strict effect on removal efficiency. Increasing temperature from 150 to 450°C led to increase in removal efficiency of about 20%.