纯镍表面结焦形貌及其影响因素研究

中国腐蚀与防护学报

2001, Vol. 21

Issue (1): 10-18

研究报告

本期目录 | 过刊浏览

纯镍表面结焦形貌及其影响因素研究

吴欣强;郑玉贵;柯伟

中科院金属所

STUDY ON SURFACE COKING MORPHOLOGY OF PURE NICKEL AND ITS CORRELATIVE FACTORS

Xinqiang Wu;Qugui Zheng;Wei Ke

中科院金属所

全文: PDF(349 KB)

摘要: 系统研究了丙烷裂解过程中纯镍表面的结焦形貌及其影响因素.结果表明，纯镍表面的沉积焦炭有三种形貌，分别为纤维状、颗粒状和膜状.纤维状焦炭在800℃左右形成，需要基底金属镍的参与，预氧化后的镍表面显著加剧这种焦炭的沉积 .提高结焦温度或延长结焦时间，结焦机制发生转变，焦炭形貌也逐渐转变为颗粒状.颗粒状焦炭形成于气相反应，与基底金属镍无关.膜状焦炭形成于结焦初期，溶解/析出机制及表面直接形核、生长机制均对其形成有贡献.抑制纤维状焦炭的形成有益于减轻镍表面总的结焦程度.

关键词 ：纯镍, 丙烷, 裂解反应, 表面结焦, 预氧化

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 particlelike coke,and th e filmlike coke.Deposition of the filamentary coke happens at approximate 800 ℃ and is closely dependent on the nickel substrate.Preoxidation 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 particlelike mor phology.Since the particlelike coke is derived from a series of gasphase rea ctions,it bears no relation to the nickel substrate naturally.The filmlike 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 filmlike coke.Restraining the formation of the filament ary coke can be beneficial to alleviate the totally coking degree on the nickel surface.

Key words： pure nickel propane cracking reaction surface coking preoxidation

收稿日期: 2000-01-20

ZTFLH:

TG174.2

通讯作者: 吴欣强

Corresponding author: Xinqiang Wu

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引用本文:

吴欣强; 郑玉贵; 柯伟 . 纯镍表面结焦形貌及其影响因素研究[J]. 中国腐蚀与防护学报, 2001, 21(1): 10-18 .
Xinqiang Wu, Qugui Zheng, Wei Ke. STUDY ON SURFACE COKING MORPHOLOGY OF PURE NICKEL AND ITS CORRELATIVE FACTORS. J Chin Soc Corr Pro, 2001, 21(1): 10-18 .

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2001/V21/I1/10

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