Engineering Research Equipment: Equipment for Pore Structure Characterization of Solids in Chemical Reaction Engineering Studies

摘要- Varma - 9412018该设备拨款用于购买自动化系统，用于表征各种化学反应中涉及的固体材料的内部结构。这些材料包括吸附剂、催化剂和催化剂载体，以及陶瓷氧化物和氮化物、金属间化合物等先进材料。该设备是Autosorb-1单元，这是一种具有氪和微孔选项（Kr/MP）的体积气体吸附测量系统，所需的配件主要包括一台Macintosh计算机和打印机。该装置由Quantachrome公司制造，具有一个分析站和两个脱气站。任何无腐蚀性气体都可以作为吸附物，氮气是典型的选择。对于具有低表面积的样品，使用氪而不是氮，以及微孔样品的表征，需要作为Kr/MP附件的一部分提供的涡轮分子泵。主要从事催化与反应工程、先进材料合成、污染治理等方面的研究。这些领域的研究项目都涉及对具有不同孔隙和微粒微观结构的样品的研究。孔隙结构是决定材料性能的一个重要特征，因此，在某些情况下，对大量样品进行表征是必不可少的。在一些项目中，表面积是为数不多的可以测量的参数之一，以便量化系统变量的影响。在某些情况下，为了监测随着反应程度的增加孔隙结构的演变，需要测量表面积和孔径分布。这些测量对于确认关于替代反应途径的模型假设也很重要，例如，在材料合成或催化反应过程中。设备的选择是专门为了适应项目中研究的各种材料。

Abstract - Varma - 9412018 This equipment grant is to provide funds for the purchase of an automated system for the characterization of the internal structure of solid materials involved in a wide variety of chemical reactions. These materials include adsorbents, catalysts and catalyst supports, and advanced materials such as ceramic oxides and nitrides, and intermetallic compounds. The equipment is an Autosorb-1 unit, a volumetric gas sorption measurement system with krypton and micropore options (Kr/MP), and required accessories consisting primarily of a Macintosh computer and printer. The unit is manufactured by Quantachrome Corporation and features one analysis station and two degassing stations. Any non-corrosive gas can be used as the adsorbate, nitrogen being a typical choice. The use of krypton, rather than nitrogen, for samples having low surface area, and the characterization of microporous samples, require a turbomolecular pump which is available as part of the Kr/MP accessory. The Principal Investigator is conducting research in catalysis and reaction engineering, synthesis of advanced materials, and pollution abatement. Research projects in each of these areas involve studies of samples with different porous and particulate microstructures. The pore structure is one important characteristic in determining the performance of materials, and therefore it is essential to characterize this property, in some cases for a large number of samples. In several of the projects, the surface area is one of the few parameters which can be measured in order to quantify the effect of system variables. In certain cases, measuments of surface area and pore size distribution are required in order to monitor the evolution of the pore structure with increasing extent of reaction. These measurements are also important in confirming model hypotheses regarding alternative reaction pathways, e.g., during materials synthesis, or during catalytic reactions. The equipment has been chosen specif ically to accommodate the wide range of materials being studied in the projects.