二氧化錳晶型結構對鈀觸媒在氫氣催化還原一氧化氮的影響
Other Title
Hydrogenation of Nitric Oxide over Pd Based Catalyst: Effect of MnO2 Structure
Journal
2025臺大學士論文獎
Date Issued
2025
Author(s)
Yi-An Wang
Advisor
Abstract
In this research project, I synthesized palladium-supported manganese dioxide catalysts (Pd/MnO2) and applied them to the deNOx reaction for the removal of the harmful gas nitric oxide (NO). The catalysts were prepared using the hydrothermal method by adjusting the precursor ratio, hydrothermal temperature, and reaction time to obtain four different crystalline structures of MnO2 supports (α-, β-, γ-, and δ-MnO2). Palladium was subsequently deposited onto these supports via the deposition-precipitation method to obtain Pd/MnO2 catalysts. The Pd/MnO2 catalysts were then applied to the selective catalytic reduction of NO with hydrogen (H2-SCR). Under these conditions, it was found that hydrogen was not selectively reducing NO to nitrogen (N2) but instead preferentially reacted with oxygen to form H2O. Therefore, the reaction conditions were modified to an oxygen-free environment to facilitate the conversion of NO to ammonia (NH3). Hydrogen temperature-programmed reduction (H2-TPR) and hydrogen temperature-programmed desorption (H2-TPD) analyses revealed that the introduction of palladium nanoparticles significantly enhanced the hydrogen adsorption capacity of the catalyst surface, which contributed to an improved NO conversion efficiency and its reduction to NH3, a product of high economic value. Additionally, the structure of the MnO2 support had a significant impact on catalytic activity, with Pd/β-MnO2 exhibiting the highest NO conversion and NH3 selectivity. The NO pulse experiment further suggested that this superior performance was associated with the relatively high NO adsorption capacity of β-MnO2.
Subjects
NO removal
Pd/MnO2
Pulse surface reaction
Metal-Support interaction
Publisher
國立臺灣大學化學工程學系
Description
獎項：傅斯年獎；指導教授：游文岳
Type
thesis
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