Drenchev Nikola L, Shivachev Boris L, Dimitrov Lubomir D, Hadjiivanov Konstantin I
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Nanomaterials (Basel). 2023 Aug 8;13(16):2278. doi: 10.3390/nano13162278.
Efficient CO capture materials must possess a high adsorption capacity, suitable CO adsorption enthalpy and resistance to water vapor. We have recently reported that Ca cations exchanged in FAU zeolite can attach up to three CO molecules. Here we report the effect of water on the adsorption of CO. Formation of Ca(HO)(CO), Ca(HO)(CO) and Ca(HO)(CO) mixed ligand complexes were established. The Ca(HO)(CO) species are readily formed even at ambient temperature and are characterized by ν(CO) and ν(CO) infrared bands at 2358 and 2293 cm, respectively. The Ca(HO)(CO) species are produced at low temperature and are identified by a ν(CO) band at 2291 cm. In the presence of large amounts of water, Ca(HO)(CO) complexes were also evidenced by ν(CO) and ν(CO) bands at 2348 and 2283 cm, respectively. The results demonstrate that, although it has a negative effect on CO adsorption uptake, water in moderate amounts does not block CO adsorption sites.
高效的CO捕获材料必须具备高吸附容量、合适的CO吸附焓以及对水蒸气的抗性。我们最近报道了在FAU沸石中交换的Ca阳离子最多可附着三个CO分子。在此，我们报告水对CO吸附的影响。已确定形成了Ca(HO)(CO)、Ca(HO)(CO)和Ca(HO)(CO)混合配体配合物。即使在环境温度下，Ca(HO)(CO)物种也很容易形成，其特征在于分别在2358和2293 cm处的ν(CO)和ν(CO)红外波段。Ca(HO)(CO)物种在低温下产生，并通过2291 cm处的ν(CO)波段进行识别。在大量水存在的情况下，Ca(HO)(CO)配合物也分别通过2348和2283 cm处的ν(CO)和ν(CO)波段得到证实。结果表明，尽管水对CO吸附量有负面影响，但适量的水不会阻塞CO吸附位点。
