Determination of Ideal Broth Formulations Needed to Prepare Hydrous Cerium Oxide Microspheres via the Internal Gelation Process.

Collins, J. L. ; Chi, A.

Technical Information Center Oak Ridge Tennessee

关键词: Cerium oxides;    Gelation;    Ammonium nitrates;    Gels;    Synthesis;   

RP-ID  :  DE2009947141

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

A simple test tube methodology was used to determine optimum process parameters for preparing hydrous cerium oxide microspheres via the internal gelation process. Broth formulations of cerium ammonium nitrate ((NH4)2Ce(NO3)6), hexamethylenetetramine, and urea were found that can be used to prepare hydrous cerium oxide gel spheres in the temperature range of 60 to 90 degrees C. A few gel-forming runs were made in which microspheres were prepared with some of these formulations to be able to equate the test-tube gelation times to actual gelation times. These preparations confirmed that the test-tube methodology is reliable for determining the ideal broth formulations.