https://doi.org/10.3390/catal11111355
“CO2 capacity was determined via the measurements of CO2 isotherms of the materials, as shown in Figure 7, where the CO2 adsorption capacity and the adsorption rate together with the Langmuir isotherm parameters are tabulated in Table 3. Microporous Na-SSZ-13-micro exhibits reasonable capacities of 3.23 and 3.18 mmol·g−1 for Si/Al ratios of 20 and 40 respectively, and this capacity is reduced with the introduction of different degrees of mesoporosity, with a capacity of 2.63 mmol·g−1 for a template ratio of 0.2 as being the lowest. Increasing the mesoporgen to SDA template ratio leads to a rise in capacity. A template ratio of 0.6 results in the greatest capacity observed among the Na-SSZ-13-meso analogues. The value of 3.10 mmol·g−1 is similar to those of the microporous materials. This agrees with the N2 physisorption results because Na-SSZ-13-0.6 is more microporous. The increase in the mesoporgen to SDA template ratio leads to a rise in CO2 capacity, which coincides with the increase in micropore volume. This implies that the higher amount of mesoporgen in the synthesis solution prevents it from being involved in the structure formation, and materials tend to become more microcrystalline. Therefore, there is an optimum template ratio.”
