Isotherm of ammonia adsorption on zeolite CaA (MSS-622)

Ergashev , Oybek, Bazarbaev, Muratali, Juraeva, Ziyoda, Bakhronov, Khayot, Kokharov, Mirzokhid, Mamadaliyev, Utkurbek

Наманган муҳандислик­технология институти илмий­техника журнали · 2025-yil

Annotatsiya

This article presents the experimentally obtained values of the adsorption isotherm of ammonia molecules on zeolitite СаА (MSS-622) at a temperature of 303 K. The isotherm was measured using a DAC-1-1A microcalorimeter connected to a universal high-vacuum device. The relationship between the amount of ammonia adsorption and its energetic characteristics on СаА (MSS-622) zeolite was established. Additionally, the sorption mechanism from the initial adsorption stage to the experimental range and the filling behavior of ammonia molecules in the zeolite's volume were determined. Under experimental conditions, the adsorption capacity of this zeolite for ammonia was found to be 10.2 mmol/g per gram of zeolite. It was determined that 43% of the total adsorption occurs at an equilibrium pressure of 0.33 torr, 53% at 1.4 torr, 71% at 25 torr, 80% at 200 torr, 98% at 476 torr, and 100% at 614 torr. The adsorption isotherm was reinterpreted using the three-term equation of the volumetric filling theory of micropores (VMOT), and the theoretically calculated values were shown to fully match the experimental data. It was proven that ammonia molecules initially form tetrameric ion-molecular complexes 4NH3:Na+ with sodium cations and subsequently trimeric complexes 3NH3:Ca2+ with calcium cations in the first coordination sphere of the zeolite.

Maqola ma’lumotlari
MualliflarErgashev , Oybek, Bazarbaev, Muratali, Juraeva, Ziyoda, Bakhronov, Khayot, Kokharov, Mirzokhid, Mamadaliyev, Utkurbek
JurnalНаманган муҳандислик­технология институти илмий­техника журнали
NashriyotНаманган муҳандислик-технология институти
ISSN2181-8622, 1682-8658
Nashr sanasi2025-03-31
Jild10
Son1
Betlar84-92
TilIngliz
DOI10.61151/stjniet.v10i1.729
Indeksga qo‘shilgan2026-08-26

DOI: 10.61151/stjniet.v10i1.729 · Maqolaning asl sahifasi

Kalit so‘zlar

adsorption, enthalpy, free energy, isotherm, pressure, relative pressure, microcalorimeter, ammonia

Iqtibos keltirish

APAErgashev , Oybek, Bazarbaev, Muratali, Juraeva, Ziyoda, Bakhronov, Khayot, Kokharov, Mirzokhid, & Mamadaliyev, Utkurbek (2025). Isotherm of ammonia adsorption on zeolite CaA (MSS-622). Наманган муҳандислик­технология институти илмий­техника журнали, 10(1), 84-92. https://doi.org/10.61151/stjniet.v10i1.729
GOST (OAK)Ergashev , Oybek va b. Isotherm of ammonia adsorption on zeolite CaA (MSS-622) // Наманган муҳандислик­технология институти илмий­техника журнали. – 2025. – T. 10, № 1. – P. 84-92. – DOI: 10.61151/stjniet.v10i1.729.
MLAErgashev , Oybek, Bazarbaev, Muratali, Juraeva, Ziyoda, Bakhronov, Khayot, Kokharov, Mirzokhid, and Mamadaliyev, Utkurbek. “Isotherm of ammonia adsorption on zeolite CaA (MSS-622).” Наманган муҳандислик­технология институти илмий­техника журнали, 10(1), 84-92, 2025. https://doi.org/10.61151/stjniet.v10i1.729
ChicagoErgashev , Oybek, Bazarbaev, Muratali, Juraeva, Ziyoda, Bakhronov, Khayot, Kokharov, Mirzokhid, and Mamadaliyev, Utkurbek. “Isotherm of ammonia adsorption on zeolite CaA (MSS-622).” Наманган муҳандислик­технология институти илмий­техника журнали, 10(1), 84-92 (2025). https://doi.org/10.61151/stjniet.v10i1.729
HarvardErgashev , Oybek, Bazarbaev, Muratali, Juraeva, Ziyoda, Bakhronov, Khayot, Kokharov, Mirzokhid, and Mamadaliyev, Utkurbek (2025) ‘Isotherm of ammonia adsorption on zeolite CaA (MSS-622)’, Наманган муҳандислик­технология институти илмий­техника журнали, 10(1), 84-92. https://doi.org/10.61151/stjniet.v10i1.729
BibTeX
@article{ergashevoybek2025,
  title = {Isotherm of ammonia adsorption on zeolite CaA (MSS-622)},
  author = {Ergashev , Oybek and Bazarbaev, Muratali and Juraeva, Ziyoda and Bakhronov, Khayot and Kokharov, Mirzokhid and Mamadaliyev, Utkurbek},
  journal = {Наманган муҳандислик­технология институти илмий­техника журнали},
  year = {2025},
  volume = {10},
  number = {1},
  pages = {84-92},
  doi = {10.61151/stjniet.v10i1.729},
  url = {https://doi.org/10.61151/stjniet.v10i1.729}
}

Boshqa maqola uchun iqtibos tayyorlash

Наманган муҳандислик­технология институти илмий­техника журнали jurnalidan boshqa maqolalar

Наманган муҳандислик­технология институти илмий­техника журнали — barcha maqolalar · 2025-yil arxivi

Ergashev , Oybek — boshqa maqolalari