A new adsorbent CO.sub.2-ONE for removal of acidic gases such as carbon dioxide and hydrogen sulfide was developed from hydrothermal reaction of natural limestone with natural kaolin via sodium hydroxide. Several synthesis conditions were employed such as initial concentration of NaOH, weight ratio of limestone to kaolin, reaction temperature and pressure. The produced CaNaSiO2Al2O3 samples were characterized using XRD and EDS and showed that a mixture of Gehlenite Ca.sub.2Al(A.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22 and Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) with percentage of 43 and 57 was successfully produced, respectively. Another produced sample showed the presence of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22, Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) and Lawsonite CaAl.sub.2Si.sub.2O.sub.7OH.sub.2(H.sub.2O) with percentage of 4.1 and 7.4 and 88, respectively.

A new adsorbent CO.sub.2-ONE for removal of acidic gases such as carbon dioxide and hydrogen sulfide was developed from hydrothermal reaction of natural limestone with natural kaolin via sodium hydroxide. Several synthesis conditions were employed such as initial concentration of NaOH, weight ratio of limestone to kaolin, reaction temperature and pressure. The produced CaNaSiO2Al2O3 samples were characterized using XRD and EDS and showed that a mixture of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22 and Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) with percentage of 43 and 57 was successfully produced, respectively. Another produced sample showed the presence of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22, Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) and Lawsonite CaAl.sub.2Si.sub.2O.sub.7OH.sub.2(H.sub.2O) with percentage of 4.1 and 7.4 and 88, respectively.

Provided are apparatus and systems having a poppet valve assembly and swing adsorption separation techniques related thereto. A poppet valve includes a valve body, a plurality of static valves fixedly secured to the valve body and a single dynamic poppet valve having a plurality of openings. The plurality of static valves align and mate with the plurality of openings. The single dynamic poppet valve reciprocates to selectively open and close the plurality of static valves.

A new adsorbent CO.sub.2-ONE for removal of acidic gases such as carbon dioxide and hydrogen sulfide was developed from hydrothermal reaction of natural limestone with natural kaolin via sodium hydroxide. Several synthesis conditions were employed such as initial concentration of NaOH, weight ratio of limestone to kaolin, reaction temperature and pressure. The produced CaNaSiO.sub.2Al.sub.2O.sub.3 samples were characterized using XRD and EDS and showed that a mixture of Gehlenite Ca.sub.2Al(A.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22 and Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) with percentage of 43 and 57 was successfully produced, respectively. Another produced sample showed the presence of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22, Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) and Lawsonite CaAl.sub.2Si.sub.2O.sub.7OH.sub.2(H.sub.2O) with percentage of 4.1 and 7.4 and 88, respectively.

A new adsorbent CO.sub.2-ONE for removal of acidic gases such as carbon dioxide and hydrogen sulfide was developed from hydrothermal reaction of natural limestone with natural kaolin via sodium hydroxide. Several synthesis conditions were employed such as initial concentration of NaOH, weight ratio of limestone to kaolin, reaction temperature and pressure. The produced CaNa-SiO2-Al2O3 samples were characterized using XRD and EDS and showed that a mixture of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22 and Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) with percentage of 43 and 57 was successfully produced, respectively. Another produced sample showed the presence of Gehlenite Ca.sub.2Al(Al.sub.1.22Si.sub.0.78O.sub.6.78)OH.sub.0.22, Stilbite Na.sub.5.76Ca.sub.4.96(Al.sub.15.68Si.sub.56.32O.sub.144) and Lawsonite CaAl.sub.2Si.sub.2O.sub.7OH.sub.2(H.sub.2O) with percentage of 4.1 and 7.4 and 88, respectively.