Adsorption Equilibria and Kinetics of Carbon Monoxide on Zeolite 5A, 13X, MOF-5, and MOF-177

Abstract

Carbon monoxide adsorption equilibria and kinetics on zeolite 5A, 13X, MOF-5, and MOF-177 were measured volumetrically at (298, 237, and 194.5) K and carbon monoxide pressures up to 108 kPa. It was found that zeolite 5A had the highest adsorption capacity at ambient temperature (298 K) and ambient pressure (108 kPa), whereas MOF-177 was a better adsorbent at (194.5 and 237) K. Both the Langmuir and Freundlich isotherm models were used to correlate the adsorption isotherms. Diffusivities of carbon monoxide in these adsorbents were estimated from the adsorption uptake curves by a micropore diffusion model. The average carbon monoxide diffusivities at 298 K and carbon monoxide pressures below 108 kPa are 3.42·10−11 m2·s−1, 1.40·10−11 m2·s−1, 1.72·10−8 m2·s−1, and 5.01·10−9 m2·s−1 for zeolite 5A, 13X, MOF-5, and MOF-177, respectively. The heat of adsorption of carbon monoxide at low coverage on zeolite 5A and 13X is below 70 kJ·mol−1 and drops rapidly as the coverage increases, while the heat of adsorption of carbon monoxide in MOF-5 and MOF-177 is in the range of (16 to 22) kJ·mol−1.

Study of the Adsorption Space of Modified Clinoptilolites

“…Thereafter, with the relation: q iso (0.37) = 1.16 E were calculated the isosteric heat of adsorption ( Table 5). The results reported indicated that the tested modified zeolites shows similar values for the measured isosteric heat of adsorption; but greater than those value of the isosteric heat of adsorption reported also in the present paper for the ZSM-5 zeolite, also larger than those reported for a particle packing silica and a dealuminated Y zeolite (DAY) [34], Cd, Zn and Ni-nitroprussides [41] and Cu-nitroprusside [40] and a Ni-MOF [39] (Table 6), as well bigger than experimental isosteric adsorption heats measured for the adsorption carbon dioxide on MCM-41- [58], silicalite [59], Na clinoptilolite and K-clinoptilolite [60], Na-A [61] and Na-X and MOF-5 [62] and MOF-508b [63], but similar to measured isosteric heats of adsorption for the adsorption of carbon dioxide on sodium ferrerite (Na-FER) [64]. The previously described adsorption data indicated that the interaction of the carbon dioxide molecule with the modified zeolites is strong.…”

Oxidation of Ethylbenzene Using Nickel Oxide Supported Metal Organic Framework Catalyst

“…EB oxidation was carried out at 150 °C for 5 different reaction times (6,8,10,15, and 24 h) with 0.10 Ni-MOF-5 catalyst and 5.5 mL/min O 2 flow. The results are displayed in Figure 7.…”

“…[1][2][3][4][5] In recent years, ongoing efforts have been made to explore potential applications of MOFs in various fields, including gas adsorption, separation, and storage; [6][7][8][9][10][11] in drug delivery; 12 sensing; 13,14 and enantio-selective catalysis. [15][16][17] MOFs are promising catalysts because the active sites of MOFs can be tailored in a systematic way for specific catalytic applications.…”

CuAlCl4 doped MIL-101 as a high capacity CO adsorbent with selectivity over N2

“…It is toxic to human beings because it combines with hemoglobin in the blood to form carboxy-hemoglobin which reduces the oxygen carrying capacity of the blood and can lead to death. So from a safety perspective, it is imperative to remove even trace amounts of carbon monoxide from industrial air streams [2]. Carbon monoxide is the major component of off-gases produced from steel and other metallurgical plants.…”