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

摘要-VARMA-9412018这项设备赠款是为购买自动化系统提供资金，该系统用于表征涉及各种化学反应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，以及先进材料，如陶瓷氧化物和氮化物，以及金属间化合物。该设备是一台Autosorb-1装置，是一个带有氪和微孔选项(Kr/MP)的容积式气体吸附测量系统，以及主要由Macintosh计算机和打印机组成的必要附件。该装置由Quantachrome Corporation制造，具有一个分析站和两个脱气站。任何非腐蚀性气体都可以用作吸附剂，氮气是典型的选择。对于低表面积的样品，使用氪而不是氮，以及对微孔样品进行表征，都需要一个涡轮分子泵，作为Kr/MP附件的一部分。首席研究员从事催化和反应工程、先进材料合成和污染治理方面的研究。每个领域的研究项目都涉及对具有不同孔隙和颗粒微结构的样品的研究。孔结构是决定材料性能的一个重要特征，因此，在某些情况下，对于大量的样品，表征这种性质是必不可少的。在几个项目中，表面积是为数不多的可以测量的参数之一，以量化系统变量的影响。在某些情况下，需要测量比表面积和孔径分布，以便随着反应程度的增加而监测孔结构的演变。这些测量对于确认关于替代反应路径的模型假设也很重要，例如，在材料合成期间或在催化反应期间。该设备是专门为适应项目中正在研究的各种材料而选择的。

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.