Carbonaceous deposition on Mo/HMCM-22 catalysts for methane aromatization: A TP technique investigation
Carbonaceous deposition on Mo/HMCM-22 catalysts for methane aromatization: A TP technique investigation
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DOI：
10.1006/jcat.2002.3540
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发表时间：
2002-06-10
影响因子：
7.3
通讯作者：
Bao, XH
中科院分区：
文献类型：
--
作者：
Ma, D;Wang, DZ;Bao, XH
采用程序升温氧化（TPO）、程序升温表面反应（TPSR）和程序升温加氢（TPH）技术研究了甲烷芳构化Mo/HMCM-22催化剂上的积炭。不同的含碳物种和它们的数量是不同的。至少有三种焦炭：碳化钼中的碳化物碳、与铼有关的焦炭和酸性部位上的芳香型焦炭。这表明，在布朗斯台德酸中心上的芳香型焦炭是负责催化剂失活。在程序升温氢化后，催化活性可以恢复。(C)2002 Elsevier Science（美国）。
TPO (temperature-programmed oxidation), TPSR (temperature-programmed surface reaction), and TPH (temperature-programmed hydrogenation) techniques are used to investigate carbonaceous deposition on Mo/HMCM-22 catalysts for methane aromatization. Different carbonaceous species and their amounts are distinguished. There are at least three kinds of cokes: carbidic carbon in molybdenum carbide, molybdenum-associated coke, and aromatic-type cokes on acid sites. It is suggested that the aromatic-type cokes on Bronsted acid sites are responsible for catalyst deactivation. Catalytic activity can be restored after temperature-programmed hydrogenation. (C) 2002 Elsevier Science (USA).