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qbliu

金虫 (正式写手)

[交流] 帮忙分析一下几个积炭催化剂的TG-DTA图

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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dj_king

铁杆木虫 (著名写手)

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nxl5096224(金币+1,VIP+0):谢谢应助!
qbliu(金币+1,VIP+0):谢谢
qbliu(金币+2,VIP+0):thanks 4-4 09:37
积炭有软硬之分,软炭比较硬炭更容易燃烧。
快乐不打折
2楼2008-05-14 14:07:00
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limour

新虫 (小有名气)

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qbliu(金币+4,VIP+0):谢谢!!!
rabbit7708(金币+2,VIP+0):鼓励新虫热心应助,欢迎常来催化版喽!:)
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
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tanghd

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nxl5096224(金币+1,VIP+0):多谢帮助!
qbliu(金币+1,VIP+0):多谢帮助
催化剂上的积碳并不是单一的,我上次做的催化剂积碳峰有三个,分别是活性炭物种(可以参与反应),2、无定性的炭,3、石墨化的炭。而且不同的催化剂积碳的形式也会不一样,也可能出现不同无定性的炭。所以你去查一下你的催化剂积碳情况,及别人做的工作、文献。
4楼2008-05-17 08:46:17
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limour

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buffaloli(金币+1,VIP+0):多谢讨论!
qbliu(金币+1,VIP+0):thanks 4-4 09:36
I think only last two kinds of carbon were coke. the first one, active carbon species, can not be name " coke"

I think you used TPO?
引用回帖:
Originally posted by tanghd at 2008-5-17 08:46:
催化剂上的积碳并不是单一的,我上次做的催化剂积碳峰有三个,分别是活性炭物种(可以参与反应),2、无定性的炭,3、石墨化的炭。而且不同的催化剂积碳的形式也会不一样,也可能出现不同无定性的炭。所以你去查一 ...

5楼2008-05-19 18:32:07
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queershanren

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qbliu(金币+1,VIP+0):thanks 4-4 09:37
前一个积炭峰应该是具有活性的,不会造成真正的积炭
6楼2008-05-28 12:45:06
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