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Effects of Temperature and Time of CH4 Decomposition on the Carbon Deposition over Ni/Al2O3 Catalyst
Zhou Jiping,Li Chunyi,Shen Shikong
Author NameAffiliationE-mail
Zhou Jiping CNPC Key Laboratory of CatalysisUniversity of Petroleum(Beijing)Beijing 102200  
Li Chunyi CNPC Key Laboratory of CatalysisUniversity of Petroleum(Beijing)Beijing 102200  
Shen Shikong CNPC Key Laboratory of CatalysisUniversity of Petroleum(Beijing)Beijing 102200 skshen@www.bjpeu.edu.Cn 
Abstract:
The effects of temperature and time on the nature of carbon deposition over Ni / Al2O3 catalyst were investigated using an on - line quadruple mass spectrometer method. The experimental results suggested that the initial carbon species,viz. NiXC,produced by CH4 decomposition over reduced Ni / Al2O3,trends to diffuse into the bulk at lower temperature(600700℃)and to transform into more inactive carbon species at higher temperature(700800℃)and longer duration. The catalyst deactivates quickly for CH4 decomposition at higher temperature due to the blocking of active sites by immobile carbon species.
Key words:  Methane decomposition,Ni / Al2O3 catalyst,Carbon species,Diffuse,Transformation
FundProject:中国石油天然气集团公司资助项目
Ni/Al2O3催化剂上甲烷的分解温度和时间对积炭的影响
周吉萍,李春义,沈师孔*
摘要:
用在线质谱法研究了Ni/Al2O3催化剂上甲烷分解温度和时间对积炭的影响。实验结果表明:在600~800℃内甲烷在还原的Ni/Al2O3催化剂上可分解为表面碳物种(即NiXC)和氢气,这种表面碳物种在较低的温度下可扩散进入体相,在高温下可逐步转化为低活性的碳物种。在800℃下由于表面碳物种不能扩散进入体相,金属镍中心迅速被表面碳物种覆盖,导致甲烷分解反应失活。
关键词:  甲烷分解  Ni/Al2O3催化剂  碳物种  扩散  转化
DOI:1003-7713/2000/06-0736-05
分类号: