关键词:

钙钛矿型催化剂, 柠檬酸络合法, 浸渍法, 二氧化硫, 炭烟氧化

Abstract:

La_0.8K_0.2Mn_0.95Cu_0.05O₃ perovskite-type oxide was synthesized by the complex method of citric acid, then was supported on γ-Al₂O₃ to obtain a series of loadings by using the impregnation method, complexing method and mixing method. Temperature programmed oxidation (TPO) was used to investigate their catalytic behavior of model soot oxidation in a feed gas containing various concentrations of SO₂. The catalysts were characterized with XRD, BET, and FT-IR. XRD and BET results showed that the catalysts exhibited good structure of perovskite-type before being supported, and the specific surface area increased after being supported. TPO tests revealed that the activity of La_0.8K_0.2Mn_0.95Cu_0.05O₃/γ-Al₂O₃ prepared by the impregnation method with 20%(mass) loading was better. La_0.8K_0.2Mn_0.95Cu_0.05O₃ catalyst presented higher catalytic activity than those supported ones, i. e. La_0.8K_0.2Mn_0.95Cu_0.05O₃/γ-Al₂O_3, however, sulfur-resistance of catalysts was improved when supported on γ-Al₂O₃. FT-IR spectrum confirmed that with increasing concentration of SO₂, the SO^2-₄ species formed and accumulated on the catalyst surface would inhibit the catalytic activity.

Key words:

钙钛矿型催化剂, 柠檬酸络合法, 浸渍法, 二氧化硫, 炭烟氧化