Reduction Characteristics of NOx Storage Catalyst for Lean-burn Natural Gas Vehicles 18ICES/050
Authors
Choon-Hee Lee - Chonnam National University
Byung-Chul Choi - Chonnam National University
Abstract
This study investigates the effects of basic reaction characteristics of NOx storage reduction catalyst on the emission conditions of lean burn natural gas vehicles. For the increases of surface area and thermal durability performance of the catalyst, we designed various catalysts by the double layer washcoat. The experiments were conducted with 5 kinds of NOx storage catalysts, which were manufactured with a honeycomb cordierite substrate. The experiments investigated the performance of the catalysts according to the content ratio of precious metal and additive barium(Ba). Excess amount of deposit barium in NOx storage reduction catalyst decreases the NOx storage capacity of lean exhaust as well as the cycle NOx conversion efficiency. For superior NOx conversion of NOx storage reduction catalyst, the amount of Ba should be controlled to about 43g/L, approximately. And for the best NOx conversion efficiency, the appropriate ratio of Pt, Pd and Rh should be 7:7:1.