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An adsorbent for removing CO2 from a gas mixture, the adsorbent comprising alumina and a carbonate compound where the carbonate to alumina IR absorbance intensity ratio is reduced by washing the adsorbent with water. The disclosure also describes a method of making adsorbent particles, process for r

An adsorbent for removing CO2 from a gas mixture, the adsorbent comprising alumina and a carbonate compound where the carbonate to alumina IR absorbance intensity ratio is reduced by washing the adsorbent with water. The disclosure also describes a method of making adsorbent particles, process for removing CO2 from a gas mixture using the adsorbent, and an adsorption unit using the adsorbent.

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1. A method for making adsorbent particles for adsorbing CO2, the adsorbent particles comprising alumina, one or more alkali metals, and a carbonate compound, the method comprising: washing alkali-promoted activated alumina materials comprising a carbonate compound with water; anddrying the washed a

1. A method for making adsorbent particles for adsorbing CO2, the adsorbent particles comprising alumina, one or more alkali metals, and a carbonate compound, the method comprising: washing alkali-promoted activated alumina materials comprising a carbonate compound with water; anddrying the washed alumina materials to form the adsorbent particles;wherein the washed and dried adsorbent particles have a carbonate to alumina intensity ratio, R2, which is smaller than the carbonate to alumina intensity ratio, R1, of the alkali-promoted activated alumina materials before washing;wherein the carbonate to alumina intensity ratio is as determined by Fourier Transform infrared spectroscopy of a crushed sample of the respective washed and dried adsorbent particles and a crushed sample of the alkali-promoted activated alumina materials before washing, wherein the carbonate to alumina intensity ratio is a ratio of a peak absorbance intensity for carbonate, AIcarbonate, to a peak absorbance intensity for alumina, AIalumina, (i.e. R=AIcarbonate/AIalumina)) each absorbance intensity obtained after subtracting a baseline signal intensity, where the peak absorbance intensity for alumina, AIalumina, is observed at an FTIR wavenumber in a range from 420 cm−1 to 520 cm−1, and the peak absorbance intensity for carbonate, AIcarbonate, is observed at an FTIR wavenumber in a range from 1300 cm−1 to 1400 cm−1. 2. The method according to claim 1 wherein the water is deionized water. 3. The method according to claim 1 wherein the alkali-promoted activated alumina materials are washed sufficiently to produce adsorbent particles having a carbonate to alumina intensity ratio, R2, having a value less than or equal to 0.0150. 4. The method according to claim 1 wherein the alkali-promoted activated alumina materials are washed with water until the alkali-promoted activated alumina materials have a pH in solution of 9.5 or less thereby forming washed alumina materials, the pH in solution as determined by measuring the pH of an equilibrated 2 liter solution of deionized water containing 100 g of the washed alumina materials. 5. Adsorbent particles for use in a process to remove CO2 from a gas mixture containing CO2 made in a method according to claim 1. 6. An adsorption unit comprising a bed containing the adsorbent particles according to claim 5. 7. A method for making adsorbent particles for adsorbing CO2, the adsorbent particles comprising alumina, one or more alkali metals, and a carbonate compound, the method comprising: washing alkali-promoted activated alumina materials comprising a carbonate compound with water; anddrying the washed alumina materials to form the adsorbent particles;wherein the alkali-promoted activated alumina materials are washed sufficiently to produce adsorbent particles having a carbonate to alumina intensity ratio, R, the carbonate to alumina intensity ratio, R, having a value less than or equal to 0.0150, where the carbonate to alumina intensity ratio is as determined by Fourier Transform infrared spectroscopy of a crushed sample of the adsorbent particles, wherein the carbonate to alumina intensity ratio is a ratio of a peak absorbance intensity for carbonate, AIcarbonate, to a peak absorbance intensity for alumina, AIalumina, (i.e. R=AIcarbonate/AIalumina), each peak absorbance intensity obtained after subtracting a baseline signal intensity, where the peak absorbance intensity for alumina, AIalumina, is observed at an FTIR wavenumber in a range from 420 cm−1 to 520 cm−1, and the peak absorbance intensity for carbonate, AIcarbonate, is observed at an FTIR wavenumber in a range from 1300 cm−1 to 1400 cm−1. 8. Adsorbent particles for use in a process to remove CO2 from a gas mixture containing CO2 made in a method according to claim 7.