Pt-V2O5/HM催化剂积炭机理的TPO研究

Ｐｔ┐Ｖ２Ｏ５／ＨＭ催化剂积炭机理的ＴＰＯ研究蔡炳新（湖南大学化学化工系，长沙４１００１２）周烈华郑小明（杭州大学催化研究所，杭州３１００２８）关键词铂，五氧化二钒，氢型丝光沸石，程序升温氧化酸性载体Ｐｔ系贵金属双功能催化剂表面积炭是导致其催化性能衰...

TPO STUDIES ON MECHANISM OF CARBON DEPOSITION ON Pt V 2O 5/HM CATALYST

The carbon deposition on the surface of Pt V 2O 5/HM catalyst was studied by temperature programmed oxidation (TPO) and the poisoning experiment by probe melecule (C 5H 5N, CS 2, Pb(C 2H 5) 4). The results showed that the lower temperature peak (620 K) stands chiefly for the carbon deposition on acidic sites (V 2O 5), the carbon deposition is carried out chiefly in polymerization mechanism, contains more hydrogen and is burned up easily; the higher temperature peak (820 K) stands chiefly for carbon deposition on Pt sites, the carbon deposition is carried out chiefly in dehydrogenation mechanism, contains less hydrogen and is burned up hardly. According to the results, K 2O is selected as the additive to prevent carbon deposition on Pt V 2O 5/HM catalyst.