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Cho, Kanghee,Kim, Jungsu,Park, Jong-ho,Jung, Taesung,Beum, Hee Tae,Cho, Dong-woo,Rhee, Young Woo,Han, Sang Sup Elsevier 2019 Microporous and mesoporous materials Vol.277 No.-
<P><B>Abstract</B></P> <P>We synthesized nanoporous CO-selective adsorbent composed of CuCl supported on bayerite. Before supporting the CuCl, the bayerite chemical was calcined at 623 K to increase the surface area to 469 m<SUP>2</SUP> g<SUP>−1</SUP>. The CuCl was highly dispersed on the activated bayerite via a thermal monolayer dispersion process. The highest CO adsorption capacity was achieved at an optimal temperature of 573 K and CuCl content of 30 wt%. Thus synthesized adsorbent exhibited a high CO adsorption capacity of 48.5 cm<SUP>3</SUP> g<SUP>−1</SUP> at 293 K, but a very low CO<SUB>2</SUB> adsorption capacity (2.89 cm<SUP>3</SUP> g<SUP>−1</SUP>), resulting in CO/CO<SUB>2</SUB> separation factor of 16.8. When the CuCl content increased to 36 wt%, the adsorbent exhibited much higher separation factor (35.5), although the CO adsorption capacity was somewhat smaller (41.6 cm<SUP>3</SUP> g<SUP>−1</SUP>). The CO adsorption capacity and CO/CO<SUB>2</SUB> selectivity of this adsorbent are larger than those of our previous CuCl/boehmite adsorbent showing CO adsorption of 34 cm<SUP>3</SUP> g<SUP>−1</SUP> and a CO/CO<SUB>2</SUB> separation factor of 12.4. The present adsorbent also shows very high selectivity for CO over H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>. Therefore, this adsorbent is expected to show excellent CO separation performance for various industrial processes such as steam-reforming and steel-making which involve CO, CO<SUB>2</SUB>, H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly selective CO adsorbent based on CuCl/bayerite composite was synthesized. </LI> <LI> Adsorbent exhibited very high CO/CO<SUB>2</SUB> selectivity. </LI> <LI> High separation ability is attributed to the large surface area of bayerite. </LI> <LI> Thermal treatment conditions for dispersion of CuCl on bayerite were optimized. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Cho, Kanghee,Kim, Jungsu,Beum, Hee Tae,Jung, Taesung,Han, Sang Sup Elsevier 2018 Journal of hazardous materials Vol.344 No.-
<P><B>Abstract</B></P> <P>We developed nanoporous adsorbent exhibiting unprecedented performance in separation of toxic carbon monoxide (CO). The adsorbent was prepared by dispersing CuCl on mesoporous boehmite via thermal monolayer dispersion route. A key point of the present synthesis is dispersing optimized amount of CuCl on the boehmite at a moderate temperature to maintain the characteristics of the boehmite. We performed a systematic study to reveal that a CuCl/boehmite composite (30wt% CuCl in total) thermally treated at 573K was the best optimized sample for CO separation. The CuCl/boehmite had a high capacity of CO adsorption (1.56mmolg<SUP>−1</SUP>) and an exceedingly low capacity of CO<SUB>2</SUB> adsorption (0.13mmolg<SUP>−1</SUP>) under 100kPa of each gas at 293K. The CO/CO<SUB>2</SUB> separation factor was 12.4. To the best of our knowledge, this value is the best on record. The achievement of this work is attributed to finding a new type of suitable supporting material: boehmite. The boehmite has a high affinity to CuCl, exhibits excellent dispersion of the CuCl, and achieves a superior CO adsorption capacity. However, it has a weak interaction with CO<SUB>2</SUB>. The CuCl/boehmite composite is a promising adsorbent for selective separation of CO from combustion exhaust and industrial off-gas streams.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A highly selective CO adsorbent based on a CuCl/boehmite composite was synthesized. </LI> <LI> The adsorbent exhibited a very high CO/CO<SUB>2</SUB> separation factor. </LI> <LI> High separation ability is attributed to the natural properties of the boehmite. </LI> <LI> The thermal treatment temperature was optimized for CuCl dispersion onto boehmite. </LI> </UL> </P>
Cho, Kanghee,Kim, Sang Kyum,Lee, Eun Kyung,Kim, Jong-Nam American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.8
<P>We studied the water-adsorption properties of crystalline aluminophosphates (in brief, 'AlPO4') containing ordered micropores, focusing on the effects of porous structure and heteroatoms incorporated in AlPO4 frameworks. For this investigation, AlPO4 with AFI-and CHA-type structures were hydrothermally synthesized. Also, the AFI-AlPO4 had Si, Fe, Mg, Co, or Cr incorporated at controlled amounts (0-5 mol%). Water adsorption isotherms of the AlPO4 samples were taken at 308 K, showing S-shape curve which is typical characterization of nanomaterial containing uniform nanopores. The amount of water adsorbed in AlPO4 was dependent on the specific surface area. The CHA-AlPO4 exhibited much higher water adsorption capacity than the AFI-AlPO4. The inflection-point humidity of the S-curve was also dependent on the microporous structure. In the case of AFI-AlPO4, the inflection point differed markedly depending on the amount and type of the heteroatoms incorporated in the frameworks. In a group with same micropore structure, the S-curve inflection point decreased in the order of 'solely aluminophosphate'> 'Co-doped' approximate to 'Crdoped' > 'Fe-doped'> 'Mg-doped'> 'Si-doped.' The decrease in the inflection point humidity was found to be positively correlated to the amount of the heteroatom incorporated. Different inflection point humidities might be attributed to changes in the affinity between the AlPO4 framework and water molecules as a result of incorporation of heteroatoms. The results of this study show that it is possible to control the water adsorption properties of AlPO4 precisely, which would be very helpful in developing suitable water adsorbents for use in water adsorption chilling systems under specific working conditions.</P>