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Ball Milling to Obtain K2CO3 Activated Alumina for CO2 Removal

IP.com Disclosure Number: IPCOM000235723D
Publication Date: 2014-Mar-24
Document File: 1 page(s) / 68K

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Ball milling to obtain K2CO3 activated alumina for CO2 removal

Alkali carbonate activated aluminas are used to remove water and carbon dioxide from the air feed to a cryogenic air separation plant.  High energy ball milling provides an alternative to other, well established techniques for preparation of these adsorbents.

The utility of the ball milling method was demonstrated using a laboratory scale Fritsch planetary micro mill.  Solids were milled in a 45 cc stainless steel vessel containing stainless steel milling balls.  Alumina powder and various loadings (0-40 weight %) of potassium carbonate (K2CO3) were milled under a range of conditions.  Resulting compositions were characterized by thermogravimetric analysis (TGA) to determine CO2 adsorption properties.  CO2 uptake capacities were obtained using a 1% CO2 in N2 feed at 40°C after regeneration under a N2 purge at 150°C, both for 60 min dwell times. 

Surprisingly, it was found that ball milling in the presence of water or, preferably, water and high pressure CO2resulted in improved CO2 capacities (Figure 1). 

Figure 1.  CO2 capacities of K2CO3/AA100 samples ball milled under the indicated conditions (normalized to capacity of sample milled in air).  K2CO3 loading was constant for each sample.