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帮忙分析一下几个积炭催化剂的TG-DTA图
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帮忙分析一下几个积炭催化剂的TG-DTA图 谢谢 特别是差热,在350度左右的放热峰可以认为是积炭吗 一般的积炭放热峰不应该在400度以上吗 而且怎么会出现两个峰呢 实在不太懂,请给与指教 再次感谢 [ Last edited by qbliu on 2008-5-14 at 10:12 ] |
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4楼2008-05-17 08:46:17
dj_king
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2楼2008-05-14 14:07:00
limour
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The composition and nature of coke/polyaromatic species on the surface of catalysts have been widely investigated in literature. Generally, two kinds of coke were identified by their “soft” or “hard” properties, according to their aromaticity degree. The former one displayed a low aromatic character, high H/C ratio and low combustion temperature at about 573 K, composed of alkylated mono and diaromatics. The latter one displayed a high aromatic character, low H/C ratio and high combustion temperature at about 723 K, composed of aromatics entirely. Sahoo SK, Raob PVC, Rajeshwer D, Krishnamurthy KR, Singh ID, Structural Characterization of Coke Deposits on Industrial Spent Paraffin Dehydrogenation Catalysts, Applied Catalysis A: General 2003, 244 , 311–321 Wolf EE, Alfani F, Catalysts Deactivation by Coking, Catal. Rev. Sci. Eng. 1982,24, 3, 329-371. Macia-Agullo JA, Cazorla-Amoros D, Linares-Solano A, Wild U, Su DS, Schlögl R. Oxygen functional groups involved in the styrene production reaction detected by quasi in situ XPS. Catal. Today 2005, 102, 248-253. Pereira MFR, Orfao JJM, Figueiredo JL, Oxidative dehydrogenation of ethylbenzene on activated carbon catalysts. I. Influence of surface chemical groups. Appl. Catal. A: General 1999, 184, 153-160. Trimm DL, The Formation and Removal of Coke from Nickel Catalyst, Catal. Rev. Sci. Eng. 1977,16, 155-189. |
3楼2008-05-14 21:32:54
limour
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