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Abstract Surface coking morphology of pure nickel and its correlative factors w ere investigated systematically.Results reveal that the coke deposited on surf ace of pure nickel includes the filamentary coke,the particlelike coke,and th e filmlike coke.Deposition of the filamentary coke happens at approximate 800 ℃ and is closely dependent on the nickel substrate.Preoxidation markedly aggr avates the deposition of the filamentary coke on surface of pure nickel.Either raising the coking temperature or prolonging the coking time results in change o f the coking mechanism,and the deposited coke tends to show a particlelike mor phology.Since the particlelike coke is derived from a series of gasphase rea ctions,it bears no relation to the nickel substrate naturally.The filmlike cok e is only deposited at the initial coking stage.Both the dissolution/precipitat ion mechanism and the direct nucleation/growth mechanism may make a contribution to development of the filmlike coke.Restraining the formation of the filament ary coke can be beneficial to alleviate the totally coking degree on the nickel surface.
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Received: 20 January 2000
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Corresponding Authors:
Xinqiang Wu
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