学术论文

      基于阳极Al2O3的非涂覆式金属基体整体催化剂载体的制备

      Preparation of non-coated metallic monolith catalyst support by anodization

      摘要:
      通过草酸溶液中的二步氧化法制备多孔阳极Al2O3(PAA)膜.在保持金属一体化结构下,考察阳极氧化条件(电压、时间、电解液浓度及温度)对多孔Al2O3膜的结构特性的影响.在80 ℃下对PAA膜进行水热处理1.5 h并在500 ℃下焙烧3 h.结果表明:孔径和膜厚随电压(或电解质浓度、阳极氧化时间)增加呈线性增长,孔径(或膜厚)和电解液温度呈指数型关系,孔密度和电压关系亦然;另一方面,氧化时间、电解液温度、电解液浓度对孔密度几乎没影响;平板的表面积最大可提高到3 200倍,提高电解液的温度被认为是扩大表面积最有效的方法.水热处理后表面积可以从13.5 m2/g增加到180.3 m2/g,并将无定形骨架Al2O3转变为γ-Al2O3.通过阳极氧化-水热处理-焙烧制得的锯齿状蜂窝体与商业的堇青石蜂窝体相比,比表面积略高,有更大的开孔率和更轻的质量.
      Abstract:
      Porous anodic alumina (PAA) films were prepared by a two-step anodization in oxalic acid.The effect of anodizing conditions (voltage, time, electrolyte concentration, and temperature) on structural features was investigated under the metallic monolith structure.PAA film was treated hydrothermally for 1.5 h at 80 ℃, then roasted 3 h at 500 ℃.Results showed that pore diameter and film thickness increased linearly with the increase of anodization voltage (or electrolyte concentration, or anodization time).Exponential relations between pore diameter (or film thickness) and electrolyte temperature, and between pore density and voltage were confirmed.No effect of anodization time, temperature and concentration of the electrolyte on pore density was found.The surface area of the plate could be increased to 3 200 times, and the electrolyte temperature were considered to be the most effective factor to enlarge the surface area.When the PAA was subjected into hot water at 80 ℃ for 1.5 h, its surface area increased from 13.5 m2/g to 180.3 m2/g, accompany with the transformation of alumina from amorphous to gamma form.The serrated honeycomb prepared with "anodization-hydrothermal treatment-calcination" had higher surface area, bigger open frontal area and smaller bulk density than commercial cordierite honeycomb.
      作者: 陈锐杰 [1] 顾欧昀 [1] 廖永涛 [1] 李华波 [2] 樱井诚 [3] 周吕 [1] 马华 [1] 郭燏 [1]
      Author: CHEN Ruijie [1] GU Ouyun [1] LIAO Yongtao [1] LI Huabo [2] SAKURAI Makoto [3] ZHOU Lyu [1] MA Hua [1] GUO Yu [1]
      作者单位: 南京工业大学 化工学院 材料化学工程国家重点实验室,江苏南京,210009 四川蜀泰化工科技有限公司,四川遂宁,629300 日本东京农工大学 化学工学科,日本东京184-8588
      年,卷(期): 2017, 39(3)
      分类号: TQ426.65
      在线出版日期: 2017年7月3日
      基金项目: 国家自然科学基金,江苏高校优势学科建设工程