Destruction of naphthalene via ozone-catalytic oxidation process over Pt/Al2O3 catalyst

Abstract

This study investigated the application of ozone in conjunction with Pt/Al(2)O(3) catalysts, called ozone-catalytic oxidation (OZCO) process, to destruct gaseous naphthalene (Nap). The experiments were carried out at various constant reaction temperatures (T), space velocities (SV) and inlet concentrations of ozone (C(O3,in)). The results indicate that the required T for the effective decomposition of Nap decreases with the increase in inlet concentration of ozone (C(O3,in)) at the same conversion level of Nap (X(Nap)). Further, the values of X(Nap) and mineralization extent of Nap (M(Nap)) increase linearly with the increase of C(O3,in.) Regarding the T at X(Nap)=50% (T(50)), there is about 20K reduction at SV=100,000 h(-1) for the case of OZCO process with C(O3,in) of 1750 ppmv (T(50)=460 K) compared to the process without ozone (T(50)=480 K). Further, the power law can be applied to describe the data by using the second order expression with respect to ozone and Nap concentration. The observed activation energy and frequency factor are 68.3 kJ mol(-1) and 5.36 x 10(12)L(2)mol(-1)g(-1)-cat.s(-1), respectively. The information obtained is useful for the rational design and operation of the treatment of Nap via the OZCO process.