催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (1): 25-30.

• 研究论文 • 上一篇    下一篇

CuO/分子筛夹心型吸附剂-催化剂的合成和性质

Marius BRAZLAUSKAS, Saulius KITRYS   

  1. 考那斯理工大学物理化学系, 考那斯LT-50270, 立陶宛
  • 收稿日期:2008-01-25 出版日期:2008-01-25 发布日期:2011-12-25

Synthesis and Properties of CuO/Zeolite Sandwich \=Type Adsorbent-Catalysts

Marius BRAZLAUSKAS*, Saulius KITRYS   

  1. Department of Physical Chemistry, Kaunas University of Technology, Kaunas LT-50270, Lithuania
  • Received:2008-01-25 Online:2008-01-25 Published:2011-12-25

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摘要： 以硝酸铜水溶液(浓度50.0 g/L)浸渍母体分子筛(NaA, CaA, NaX和CaX)2 h, 干燥1 h并在450 ℃焙烧6 h后制得CuO/分子筛夹心型吸附剂-催化剂. 活性组分(CuO)在母体分子筛上沉积的涂层厚度约1 mm. 采用原子吸收光谱、X射线衍射、红外光谱和差示扫描量热等技术对母体分子筛、浸渍介质和吸附剂-催化剂进行了表征. 将该吸附剂-催化剂用于醇(甲醇、丙醇和丁醇)蒸气的催化氧化,催化活性实验在固定床石英反应器中于100～350 ℃下进行,测定了生成的副产物及其在空气流中的浓度. 结果表明,在200～250 ℃时生成的副产物量最多. CuO/分子筛催化剂的使用寿命为120 d, 在此期间,该吸附剂-催化剂对醇氧化成CO2和H2O具有活性. 随着醇分子量的增加和醇初始浓度的降低,起燃温度和完全氧化温度降低.

关键词: 分子筛, 氧化铜, 吸附剂-催化剂, 挥发性有机化合物, 醇, 氧化

Abstract: The CuO/zeolite sandwich type adsorbent-catalysts were prepared by wet impregnation of parent synthetic zeolites (NaA, CaA, NaX, and CaX) with copper(Ⅱ) nitrate water solution (50.0 g/L) for2 h, followed by drying for1 hand calcination at 450 ℃ for 6 h. Composed coatings of active component (CuO) on parent zeolites are about 1 mm. The parent zeolites, impregnated media, and adsorbent-catalysts were characterized by atomic absorption spectroscopy,X-raydiffraction, infrared spectroscopy, and differential scanning calorimetry. The adsorbent-catalysts were used for catalytic oxidation of alcohol (methanol, 1-propanol, and 1-butanol) vapor, and the catalytic activity tests were carried out in a fixed-bed quartz reactor in the100-350℃ range. The by-products and their concentration in the feed stream of air were determined. The maximum quantities of by-products were formed in the range of220-250℃. The lifetime of the CuO/zeolite catalysts for the oxidation of alcohols was about 4 months. At this time, sandwich-type catalysts were active for the oxidation of alcohols into CO2 and H2O in the range of100-350℃. With increasing molecular weight of alcohols and decreasing their initial concentration in the feed stream, the temperatures of light-off and total oxidation to CO2 and H2O decreased.

Key words: zeolite, copper oxide, adsorbent-catalyst, volatile organic compound, alcohol, oxidation