Ca Aluminates Research Articles

Thermal desorption study of catalytic systems Communication 20. Adsorption of water vapors on the calcium aluminate components of catalysts

Ca aluminates are used as a component of catalysts of gas-phase processes, some of which take place with the participation of water. Nickel calcium aluminate catalysts are thus used for hydrogenation of CO and CO/sub 2/ to CH/sub 4/ and water; zinc calcium aluminate catalysts are used for sulfur purification of process gases, where water is liberated during sulfiding of ZnO; and copper zinc calcium aluminate catalysts are used in low-temperature conversion of CO with water vapor. It is also known that Ca aluminates undergo various transformations in aqueous media with the formation of Ca hydroaluminates. This paper discusses the adsorption of water from the gas phase on calcium aluminate systems, which was investigated by the thermal desorption method. Samples of varying phase composition, different CaO/Al/sub 2/O/sub 3/ ratios, and specific surface areas were also studied and are reported on here.

Infrared spectra of catalysts and adsorbed molecules

It wa~ found earlier that compounds of Ni (basic Ni carbonate) and Ca monoaluminate are capable of interaction with one another in aqueous medium with the formation of low basic and high basic Ca aluminates, possessing a highly developed surface [I]. These data served as the basis for the development of an aluminocalcium adsorbent and carrier [2]. The purpose of this work was a spectroscopic investigation of the structure of Ca ~luminates and carriers produced on the basis of them galumins.