Sulfate-promoted Titania and Zirconia Aerogels as Solid Superacids

制备了三氧化二钽和氧化锆的气凝胶，并对其进行了评价， 硫酸根离子超强酸的载体。 气凝胶是 使用溶胶-凝胶法结合 超临界敷设 稳定性和结晶性 这些材料响应于热处理的行为， 加入和不加入硫酸根离子， 通过氮吸附、X射线衍射和 差热分析 硫酸盐的酸性- 促进的气凝胶用Hammett指示剂表征， 吸附的热重和红外测量 吡啶和异丁烷的反应。 超强酸（比在水中得到的酸更强的酸） 对许多行业的许多操作至关重要。 一 许多液体和气体超强酸是可用的，但 它们总是会造成严重的职业或环境问题， 隐患 固体超强酸更容易控制， 遏制和发展是一个主要目标， 为更安全的工业环境而努力。//

Aerogels of litania and zirconia are prepared and evaluated as supports for sulfate-ion superacids. The aerogels are synthesized using a sol-gel process in conjunction with supercritical laying. The stability and crystallization behavior of these materials in response to heat treatments, both with and without the addition of sulfate ions, are studied by nitrogen adsorption, X-ray diffraction, and differential thermal analysis. Acid properties of sulfate- promoted aerogels are characterized with Hammett indicators, thermogravimeteric and infrared measurements of adsorbed pyridine, and the reaction of isobutane. Superacids (acids stronger than what can be obtained in water) are essential to many operations in several industries. A number of liquid and gaseous superacids are available, but they invariably present serious occupational or environmental hazards. Solid superacids are much easier to control and contain and their development is a major objectives in the striving for a safer industrial environment. //