Natural disasters are those elements in the physical environment which are harmful to man and caused by forces extraneous to him.The socio economic costs of natural disasters have reached unprecedented levels and glob...Natural disasters are those elements in the physical environment which are harmful to man and caused by forces extraneous to him.The socio economic costs of natural disasters have reached unprecedented levels and globally it appears that these damages and losses in natural disasters are increasing.India has been traditionally vulnerable to natural disasters on展开更多
The capture of CO_(2) by transition metal(Mn,Ni,Co and Zn)aluminates,calcium aluminate,calcium zirconate,calcium silicate and lithium zirconate was carried out at pre-and post-combustion temperatures.The prepared meta...The capture of CO_(2) by transition metal(Mn,Ni,Co and Zn)aluminates,calcium aluminate,calcium zirconate,calcium silicate and lithium zirconate was carried out at pre-and post-combustion temperatures.The prepared metal adsorbents were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),surface area analysis and acidity/alkalinity mea-surements.The different experimental variables affecting the adsorbents ability to capture CO_(2),such as the mol ratio of metal ions,the pressure of CO_(2),the exposure time and the temperature of the adsorbent were also investigated.Calcium zirconate captured 13.85 wt-%CO_(2) at 650℃ and 2.5 atm and calcium silicate captured 14.31 wt-%at 650℃.Molecular sieves(13X)and carbon can only capture a negligible amount of CO_(2) at high temperatures(300℃–650℃).However,the mixed metal oxides captured reasonable amount of CO_(2) at these higher temperatures.In addition,calcium aluminate,calcium zirconate,calcium silicate and lithium zirconate adsorbents captured CO_(2) at both pre and post-combustion temperatures.The trend for the amount of captured carbon dioxide over the adsorbents was calcium aluminate<lithium zirconate<calcium zir-conate<calcium silicate.展开更多
文摘Natural disasters are those elements in the physical environment which are harmful to man and caused by forces extraneous to him.The socio economic costs of natural disasters have reached unprecedented levels and globally it appears that these damages and losses in natural disasters are increasing.India has been traditionally vulnerable to natural disasters on
文摘The capture of CO_(2) by transition metal(Mn,Ni,Co and Zn)aluminates,calcium aluminate,calcium zirconate,calcium silicate and lithium zirconate was carried out at pre-and post-combustion temperatures.The prepared metal adsorbents were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),surface area analysis and acidity/alkalinity mea-surements.The different experimental variables affecting the adsorbents ability to capture CO_(2),such as the mol ratio of metal ions,the pressure of CO_(2),the exposure time and the temperature of the adsorbent were also investigated.Calcium zirconate captured 13.85 wt-%CO_(2) at 650℃ and 2.5 atm and calcium silicate captured 14.31 wt-%at 650℃.Molecular sieves(13X)and carbon can only capture a negligible amount of CO_(2) at high temperatures(300℃–650℃).However,the mixed metal oxides captured reasonable amount of CO_(2) at these higher temperatures.In addition,calcium aluminate,calcium zirconate,calcium silicate and lithium zirconate adsorbents captured CO_(2) at both pre and post-combustion temperatures.The trend for the amount of captured carbon dioxide over the adsorbents was calcium aluminate<lithium zirconate<calcium zir-conate<calcium silicate.
