引用本文:
张玉礼, 谢筱帆, 窦伯生. CoMoK/γ-Al2O3水煤气变换催化剂的硫化及反硫化[J]. 应用化学,
1994, 11(2): 62-66.
Citation: Zhang Yuli, Xie Xiaofan, Dou Bosheng. Sulfurization and Desulfurization of Water Gas Shift Catalyst CoMOK/Al2O3[J]. Chinese Journal of Applied Chemistry, 1994, 11(2): 62-66.
Citation: Zhang Yuli, Xie Xiaofan, Dou Bosheng. Sulfurization and Desulfurization of Water Gas Shift Catalyst CoMOK/Al2O3[J]. Chinese Journal of Applied Chemistry, 1994, 11(2): 62-66.
CoMoK/γ-Al2O3水煤气变换催化剂的硫化及反硫化
摘要:
以H2S和CS2作硫化剂,用TPS和TPDS方法研究了水媒气变换催化剂CoMoK/γ-Al2O3的硫化及反硫化过程。用H2S/H2硫化时,只发现H2S的消耗和H2O的生成,用CS2/H2硫化时,首先生成CO2,然后是CH4,H2O和H2S,TPG实验表明催化剂表面上有积炭,造成催化剂的活性降低。但积炭在水煤气变换反应进行中逐渐除去。TPDS实验表明N2不起反硫化作用,H2和CO也没有明显反硫化作用,H2O对CoMoK/γ-Al2O3催化剂有根强的反硫化作用。O2能使催化剂部分永久性失活。XPS测试表明反硫化的催化剂中低价的Mo4+转变成高价的Mo5+和Mo6+,导致其活性下降。
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关键词:
- CoMoK/Al2O3
- / 水煤气
- / 催化剂
- / 硫化
- / 反硫化
English
Sulfurization and Desulfurization of Water Gas Shift Catalyst CoMOK/Al2O3
Abstract:
The sulfurization and desulfurization of water gas shift catalyst CoMoK/Al2O3 have been investigated by TPS and TPDS techniques,using H2S and CS2 as sulfurizing agents.Only H2S consumption and H2O formation were found when the catalyst was sulfurized with H2S/H2.When CS2/H2 was used as sulfurizing agent,CO2 was formed at first,then CH4,H2O and H2S as shown by TPS curves.Carbon deposition on the catalyst during the sulfurization with CS2/H2 caused lowering of the catalytic activity,but the deposifed carbon could be reduced in the run of WGS reaction.The results of TPDS indicated that N2 does not act in desulfurization and H2 or CO also does not give an obvious effect on the desulfurization.However,H2O shows a strong desulfurizing effect.Oxygen caused a permanent loss of the activity in some part of the catalyst.XPS results showed that Mo4+ has been changed to Mo5+ and Mo6+ in desulfurized catalyst,decreasing its activity.
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Key words:
- CoMoK/Al2O3
- / water-gas
- / catalyst
- / sulfurization
- / desulfurization
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