REG: Acquisition of Microbalance for Sorption Studies on High Surface Area Solids

美国马萨诸塞大学阿默斯特分校化学工程系将购买一套用于多孔固体吸附研究的重量测量系统。将被获取和组装的系统围绕原位重量吸附系统构建，该系统设计用于在真空(10-6torr)至10bar和-195℃至500℃的范围内运行。该系统测量与流动气体或混合气体接触的粉状样品的重量。在固体上的吸附、解吸或反应之后是质量随时间的变化。在线质谱仪或在线红外探测系统监测通过样品的气体的组成，从而进行竞争性吸附研究。在这一努力下得到支持的研究人员目前项目的一个共同主题是气体和蒸气在微孔和介孔介质中的吸附和传输特性。这一主题的活动范围很广，从多孔介质中吸附平衡的基础研究到这些材料以粉末、整体和膜的形式用于气体和有机蒸汽分离的实际应用。活动的例子包括：开发沸石和其他分子筛吸附剂和膜了解吸附等温线中的滞后吸附过程中的吸附剂结构修改多孔介质中的相变开发用于粗糙多孔介质微观结构表征的新技术将使用该系统进行的研究目前全部由联邦来源和来自私人研究基金会和美国工业的赠款(NSF、ATP、NASA、能源部、David和Lucile Packard基金会、Camille和Henry Dreyfus基金会、Engelhard Co.)资助。目前由25名以上的研究生和博士后工作者以及10多名本科生组成的五名教职员工和他们的研究小组将使用本提案所要求的设备。

ABSTRACTCTS-0079451Michael TsapatsisThe Department of Chemical Engineering at the University of Massachusetts Amherst will purchase a gravimetric system for sorption studies in porous solids. The system that will be acquired and assembled is built around an in situ gravimetric adsorption system designed to operate from vacuum (10-6 torr) to 10 bar and from -195 C to 500 C. This system measures the weight of a powdered sample in contact with a flowing gas or mixture of gases. The adsorption, desorption orreaction on the solid is followed by the change of mass in time. On-line mass spectrometry or an on-line infrared detection system monitors the compositions of the gases passing over the sample allowing competitive adsorption studies. A common theme in the current projects of the investigators to be supported under this effort is the adsorption and transport properties of gases and vapors in microporous and mesoporous media. A wide range of activities is centered in this theme ranging from fundamental studies of adsorption equilibrium in porous media to practical applications of these materials in the forms of powders, monoliths and membranes for gas and organic vapor separations. Examples of activities include:Development of zeolites and other molecular sieve adsorbents andmembranesUnderstanding hysteresis in adsorption isothermsAdsorbent structure modification during adsorptionPhase transitions in porous mediaDevelopment of new techniques for microstructural characterization offabricated porous mediaThe research to be carried out using the system is all currently funded from Federal sources and grants from private research foundations and US industry (NSF, ATP, NASA, DOE, The David and Lucile Packard Foundation, The Camille and Henry Dreyfus Foundation, Engelhard Co.). Five faculty members and their research groups currently consisting of over twenty-five graduate students and post-doctoral workers and more than ten undergraduate students will use the equipment requested in this proposal.