Effects of Cetyltrimethylammonium Bromide and Heptane on the Surface Properties and CO₂ Adsorption of Zeolite NaX

Abstract

Zeolite X was synthesized by the gelation method for use as a CO2 adsorbent. The zeolite was prepared from a sodium silicate solution and Al(OH)3 as silicon and aluminum source, respectively. The effects of cetyltrimethylammonium bromide (CTAB) and heptane addition on surface properties, morphology, and CO2 adsorption capacities were investigated. The CO2 adsorption capacity of the synthesized zeolite with the addition of CTAB and heptane increased as demonstrated by the higher CO2 uptake (3.00 mmol/g), which was due to the higher surface area and pore volume. Interaction between CTAB micelles and sodium cations with aluminosilicate anions led to an increase in the nucleation rate and smaller crystalline sizes. The addition of heptane resulted in higher positively charged CTAB micelles and improved the affinity between the micelles and aluminosilicate anions.

Simultaneous Determination of Mixtures of Nitrite and Nitrate by Reversed‐Phase Ion‐Pair Liquid Chromatography

“…Compared to TEAB or TBAB, long‐chain alkyl ion pairs (such as CTAB) show improvement in peak profile and separation efficiency . CTAB is a cationic surfactant that is widely used . Therefore, in‐depth investigations were performed on the use of CTAB as the ion‐pair reagent to analyze mixtures of nitrite and nitrate with different molar ratios.…”

Ionic Liquid Modification of Hierarchical ZSM-5 for Solvent-Free Insertion of CO2 to Epoxides

“…Accordingly, the utilization of materials with the ability to convert CO 2 in addition to adsorption capacity is considered and preferred in the CO 2 capture and sequestration technology. Zeolite-based adsorbents are one of the best candidates in CO 2 capture technology because of their low cost, porous structure, fast CO 2 adsorption kinetics, ability to modify the surface properties, and network constructed by AlO 4 and SiO 4 tetrahedra , and therefore can be applied as an adsorbent and a catalyst. , The Lewis acid property and porous structure of ZSM-5 make it a very good catalyst, , which is thus considered an excellent choice for CO 2 sequestration . It is a MFI-type zeolite with tunable Si/Al ratio, hydrothermal stability, excellent surface area, and flexible framework. , A highly crystalline framework as well as the interaction between the electric field of ZSM-5 and the quadrupole moment of CO 2 leads to excellent carbon dioxide adsorption .…”

“…Zeolite-based adsorbents are one of the best candidates in CO 2 capture technology because of their low cost, porous structure, fast CO 2 adsorption kinetics, ability to modify the surface properties, and network constructed by AlO 4 and SiO 4 tetrahedra 6,7 and therefore can be applied as an adsorbent and a catalyst. 8,9 The Lewis acid property and porous structure of ZSM-5 make it a very good catalyst, 10,11 which is thus considered an excellent choice for CO 2 sequestration. 12 It is a MFI-type zeolite with tunable Si/Al ratio, hydrothermal stability, excellent surface area, and flexible framework.…”