华金铭,郑起,魏可镁,林性贻.酸蚀预处理对蜂窝状堇青石及其不同方法涂敷氧化铝涂层的影响[J].分子催化,2006,(6):550-555
酸蚀预处理对蜂窝状堇青石及其不同方法涂敷氧化铝涂层的影响
Influence of Acid Pretreatment on Coating process and structure Characteristics of Al2O3 Coatings on Cordierite Honeycomb with Various Coating Methods
投稿时间:2005-12-15  修订日期:2006-02-20
DOI:
中文关键词:  蜂窝状堇青石载体,酸蚀预处理,Al2O3涂层,表征
英文关键词:Cordierite Honeycomb,Acid pretreatment,Al_2O_3 coating,Characterization
基金项目:国家自然科学基金资助项目(20271012),福建省科技计划项目(2002H026)
华金铭  郑起  魏可镁  林性贻
紫金矿业集团股份有限公司紫金矿冶设计研究院,福州大学化肥催化剂国家工程研究中心,福州大学化肥催化剂国家工程研究中心,福州大学化肥催化剂国家工程研究中心 福建上杭364200,福州大学化肥催化剂国家工程研究中心,福建福州350002,福建福州350002,福建福州350002,福建福州350002
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中文摘要:
      首先采用50%草酸溶液对蜂窝状堇青石进行沸煮处理,研究酸蚀处理对其组成和孔结构的影响.采用不同方法在其表面涂敷氧化铝涂层,考察酸蚀预处理对不同涂敷过程的影响.然后,对氧化铝涂层分别进行表征和比较.结果表明,(1)随着沸煮时间逐渐延长,蜂窝状堇青石腐蚀程度加剧,内部微孔增多,进而形成介孔,比表面积和平均孔径逐渐增大.(2)除硝酸盐热分解法外,采用传统浸渍法、原位涂敷 浸渍法和铝浆洗涂法涂敷时,将堇青石进行酸蚀预处理均不利于后续A l2O3涂层的涂敷.(3)采用传统浸渍法和铝浆洗涂法,酸蚀预处理都只是增大其涂层的比孔容积.而采用原位涂敷 浸渍法,预处理还会明显影响涂层的内部孔结构.其原因可能是预处理将影响A l2O3溶胶的原位形成过程,从而影响涂层的孔结构.
英文摘要:
      The cordierite honeycomb is treated in boiling 50% oxalic acid solution before Al_2O_3 is coated onto with various methods.The change of porous structure of the honeycomb resulting from different boiling time is studied.The influence of acid pretreatment on coating process and obtained Al_2O_3 coatings is investigated.The results shows that,(1) Along with extension of boiling time,the corrosion content of cordierite due to acid treatment is increased and micro-pores are gradually created,then micro-pores are formed,leading to the increase in specific surface area and average pore diameter;2 When Al(NO_3)_3 thermal decomposition is applied,the coating process is improved,but opposite for the other coating methods,i.e.conventional dip-coating,in-situ dip plus-coating and Al_2O_3 slurry wash-coating;3 As for in-situ dip plus-coating,acid pretreatment of cordierite not only increases pore volume of its Al_2O_3 coating but also exerts an significant influence on pore structure,probably due to intervention of the treatment into in-situ formation of Al_2O_3 sol.However,only increase in pore volume of Al_2O_3 coating,which was deduced from the treatment is observed,when conventional dip-coating or Al_2O_3 slurry wash-coating method is employed.
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