A nanoprecursor method for successfully synthesizing clinoptilolite with high-crystallinity and resultant effects on CO₂/CH₄ selective adsorption

Abstract

Nanoprecursors used as a structural promoter (SP) were prepared by a hydrothermal method and named sol-SP.

Fabrication of Functionalized UiO-66 Anchored on Disorderly Layered Clinoptilolite via Surfactant-Assisted Induction for Selective Adsorption of CO2 and CH4

“…Two absorption bands approximately at 465 and 605 cm –1 corresponded to the T–O bond internal bending vibration in the SiO 4 or AlO 4 structure and the external tetrahedral double ring, respectively. These results indicated that the CP structures were retained intact before and after functionalization . Especially, the broad band at around 2910 cm –1 in the spectrum of CPP (Figure B(b)) was ascribed to the C–H vibration, which could also be observed in that of PEG (Figure B(c)), implying the existence of PEG in CPP .…”

“…These results indicated that the CP structures were retained intact before and after functionalization. 8 Especially, the broad band at around 2910 cm −1 in the spectrum of CPP (Figure 1B(b)) was ascribed to the C−H vibration, which could also be observed in that of PEG (Figure 1B(c)), implying the existence of PEG in CPP. 36 For UZC (Figure 1B(d)), the strong band at 1258 cm −1 was related to the symmetric stretching aromatic vibration of C-N, while the bands at 1540 and 1400 cm −1 were assigned to the asymmetric and symmetric stretching of carboxylate groups, respectively.…”

“…6 However, the selective adsorption of CP for CO 2 and CH 4 has yet to be improved. 7,8 The development of porous composite materials is of great significance for their potentially improved performance over that of individual components and extensive applications. 9 Metal−organic frameworks (MOFs) recently received tremendous attention because of the excellent physicochemical features with the abundant and desirable pore architectures, which have been applied as promising candidates for gas adsorption and separation.…”

“…As one of the natural zeolites, clinoptilolite (CP) with the heuolite (HEU) topology has ten-membered ring channel A (0.44 nm × 0.72 nm), eight-membered ring channel B (0.40 nm × 0.55 nm), and channel C (0.41 nm × 0.40 nm), similar in size to CH 4 (kinetic diameter of 0.38 nm) but larger than CO 2 (kinetic diameter of 0.34 nm) . However, the selective adsorption of CP for CO 2 and CH 4 has yet to be improved. , The development of porous composite materials is of great significance for their potentially improved performance over that of individual components and extensive applications …”

Amphipathic Solvent-Assisted Synthetic Strategy for Random Lamellae of the Clinoptilolites with Flower-like Morphology and Thinner Nanosheet for Adsorption and Separation of CO2 and CH4

“…However, the textural properties of the various synthetic CPs were poor (as shown in Table S1), and the probable reasons were due to their random lamellas resulting in lower surface areas and pore volumes. As demonstrated in numerous reports [51,[67][68][69], the BET surface area of the conventional clinoptilolite was around 20.0-71.6 m 2 •g −1 , mainly depending on the synthetic methods and the various morphology.…”