摘要
以高锰酸钾和富马酸为原料,采用超声波辅助溶胶-凝胶法快速合成了氧化锰八面体分子筛(OMS-2),考察了焙烧温度、焙烧时间和凝胶时间对合成材料的影响,结果发现焙烧温度影响制备材料的晶型,焙烧时间对比表面积的影响较大,而在超声波的作用下,凝胶时间对比表面积的影响不大.最佳的制备条件为室温下,在超声波作用下高锰酸钾溶液和富马酸反应30min后,凝胶24h,洗涤、过滤和干燥,然后在400℃焙烧3h,可得到高纯度、高结晶度的OMS-2样品,其比表面积达81.2m2/g.
Manganese oxide octahedral molecular sieve （OMS-2）was synthesized by sol-gel method under ultrasonic wave with KMnO4 and fumaric acid as raw materials. The effects of the preparation conditions such as calcination temperature,calcination time and gelation time on the synthesized samples were studied. The results showed that the calcination temperature influenced on the samples＇ crystallization,and the calcination time had made a great impact on the surface area of samples. However,the gelation time had not made a great impact on the surface area of samples. The optimum synthesis condition was：the sample was typically prepared by mild reaction of aqueous solution of KMnO4 with fumaric acid for 30 min at room temperature under ultrasonic wave. The resulting dark brown gel was kept at room temperature in air for 24 h and then filtered,washed,dried and calcinated at 400 ℃ for 3 h. The resultant OMS-2 has a high pureness and crystallization,and the surface area of the sample is 81.2 m2/g.
出处
《材料研究与应用》
CAS
2010年第4期406-409,共4页
Materials Research and Application
基金
广东省自然科学基金(10251009001000003)
关键词
氧化锰八面体分子筛
溶胶-凝胶法
超声波
manganese oxide octahedral molecular sieves
ultrasonic wave
sol-gel
