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SiO2-TiO2复合泡沫陶瓷的表面蚀刻及其在聚苯乙烯加氢中的应用

发表时间:2015-12-15  浏览量:1768  下载量:620
全部作者: 韩凯悦,郭文泽,王萌,孟晨,曹贵平
作者单位: 华东理工大学化工学院
摘 要: 聚苯乙烯(polystyrene,PS)催化加氢制备氢化聚苯乙烯,又称作聚环己烷乙烯,是一种重要的聚合物化学改性方法,可以提高PS的热稳定性及光学稳定性。由于PS加氢体系具有分子尺寸大、黏度高的特点,大孔泡沫陶瓷在其中具有很好的工业应用前景,然而通常大孔泡沫陶瓷由高温烧结得到,比表面积小(<1 m2/g)。研究采用有机模板复制法制备SiO2-TiO2泡沫陶瓷(SiO2-TiO2 ceramic foam,STCF),并采用HF进行蚀刻处理以增加陶瓷的比表面积。通过强度测试、扫描电子显微镜(scanning electron microscope,SEM)、能量色散光谱(energy dispersive spectroscopy,EDX)和X射线衍射(X-ray diffraction,XRD)等方法研究HF蚀刻对泡沫陶瓷表面及体相结构的影响。通过控制HF蚀刻时间,可以选择性移除STCF表面的SiO2,体相中的SiO2含量几乎不变,在陶瓷表面产生0.5~1.0 mm的孔隙。制备得到的0.1STCF-HF5比表面积明显增加,有利于活性组分Pd的负载。与未经HF蚀刻的催化剂相比,制备得到的Pd/0.1STCF-HF5加氢活性明显提高,可以消除PS线团在其空隙中的内扩散。
关 键 词: 复合材料;泡沫陶瓷;聚苯乙烯催化加氢;HF蚀刻
Title: Surface modification of macroporous SiO2-TiO2 ceramic foams via HF-etching and the application in the hydrogenation of commercial polystyrene
Author: HAN Kaiyue, GUO Wenze, WANG Meng, MENG Chen, CAO Guiping
Organization: School of Chemical Engineering, East China University of Science and Technology
Abstract: Hydrogenation of polystyrene (PS) to produce hydrogenated polystyrene, also known as polycyclohexylethylene, is an important polymer modification process to improved heat and UV resistance of PS. Owning to the large size of PS coils and high viscosity of the system, macroporous ceramic foam had good industrial potential. However, the ceramic foam usually possessed low specific surface area (<1 m2/g) due to high-temperature sintering. In this paper, the SiO2-TiO2 ceramic foam (STCF) was prepared using synthetic template replica method, and further HF-etching was applied to increase the specific surface area. The effect of HF etching on the mechanical and structural properties of STCF was investigated by strength test, scanning electron microscope (SEM), energy dispersive spectroscopy (EDX) and X-ray diffraction (XRD), respectively. By optimizing the treatment time, HF-etching could remove the SiO2 on the surface of ceramic foam sample while the SiO2 inside the struts was remained, leaving interspaces on the etched ceramic foam struts (0.5-1.0 μm). The obtained 0.1STCF-HF5 with increased specific surface area could facilitate the dispersion of Pd. The Pd-supported HF-etched STCF catalyst exhibited enhanced hydrogenation activity with negliable internal diffusion of PS coils.
Key words: composite materials; ceramic foam; polystyrene hydrogenation; HF-etching
发表期数: 2015年12月第23期
引用格式: 韩凯悦,郭文泽,王萌,等. SiO2-TiO2复合泡沫陶瓷的表面蚀刻及其在聚苯乙烯加氢中的应用[J]. 中国科技论文在线精品论文,2015,8(23):2482-2490.
 
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