Decomposition of Naphthalene Using Catalyst in Gas Phase
Date Issued
2004
Date
2004
Author(s)
Chen, Jia-Hao
DOI
zh-TW
Abstract
The purpose of this study is to investigate the feasibility of the application of the catalytic incineration using Pt/γ-Al2O3 to decompose polycyclic aromatic hydrocarbons (PAHs) (taking naphthalene which is the simplest and least toxic PAH, as a target compound) generated from the waste gaseous stream or diesel engine emission to atmosphere. The relationships between conversion efficiency, operating parameters and influential factors, such as treatment temperatures, catalyst sizes, space velocities and ozone inlet concentrations have been examined. Also, the related kinetic model is proposed to describe the reaction mechanism.
The results indicate that the catalyst of Pt/γ-Al2O3 used accelerates the reaction rate of decomposition of naphthalene, and decreases the reaction temperature. A high conversion (over 95%) can be achieved at the moderate reaction temperature of 480 K and space velocity below 35,000 hr-1. At the same operation condition, the reaction temperature needed is as high as over 1000 K to achieve conversion over 95% for the case without Pt/γ-Al2O3 catalyst. Therefore, the reaction temperature is a determining factor in the catalytic decomposition. CO2 is the major product obtained from the catalytic decomposition of naphthalene. When the conversion of naphthalene is higher than 95%, over 92% mineralization can be achieved at the reaction temperature of 505 K. Also, the results indicate that Rideal-Eley mechanism and Arrhenius equation can be reasonably applied to describe the data by using the pseudo-fist-order reaction kinetic equation. The activation energy (35.4 kcal/mol) and frequency factor (3.26 × 1017 s-1) are obtained therefore.
Subjects
動力方程式
觸媒焚化
萘
多環芳香族碳氫化合物
kinetic equation
PAHs
naphthalene
catalytic incineration
SDGs
Type
thesis