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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
CNPC Key Laboratory of Catalysis,University of Petroleum(Beijing),Beijing 102200
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*
中国石油天然气集团公司 催化重点实验室, 石油大学(北京) 北京 102200
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: