National Centre for Catalysis Research, Indian Institute of Technology-Madras, Chennai 600036, India.
ACS Appl Mater Interfaces. 2009 Nov;1(11):2462-9. doi: 10.1021/am900437u.
An environmentally benign route for the single-step synthesis of mesoporous sulfated titania is described by a seeding method using titanium oxysulfate as the titania source. The hydrolysis was performed in the presence of NaOH and seed under constant-volume conditions around 98 degrees C. The XPS and DRIFT spectra show the existence of a bridged bidentate sulfate complex on the surface of titania. The elimination of sulfur on heat treatment showed a characteristic change in mesoporosity, specific surface area, and crystallinity of the material. The transformation of sulfated titania to anatase was incomplete at 900 degrees C, showing a delay in crystallization due to the presence of sulfur. Studies on the thermal stability of the sulfated titania showed that the material obtained can be used for various applications at temperatures below 300 degrees C. The ammonia-TPD and catalytic performance studies of the sulfated titania samples showed the presence of strong acid sites.
采用钛氧硫酸盐作为钛源的种子法，描述了介孔硫酸化钛的一步合成的环境友好途径。在 NaOH 的存在下进行水解，并在 98°C 左右的等体积条件下进行种子处理。XPS 和 DRIFT 谱表明，在二氧化钛表面存在桥联双齿硫酸络合物。热处理过程中硫的消除显示出材料的中孔性、比表面积和结晶度的特征变化。在 900°C 下，硫酸化钛向锐钛矿的转化不完全，由于硫的存在，结晶延迟。对硫酸化钛的热稳定性研究表明，在 300°C 以下的温度下，该材料可用于各种应用。硫酸化钛样品的氨 TPD 和催化性能研究表明存在强酸位。
