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1. Adsorption of Carbon Dioxide, Methane, and Nitrogen Gases onto ZIF Compounds with Zinc, Cobalt, and Zinc/Cobalt Metal Centers

   https://doi.org/10.1155/2019/6130152  

   Awadallah-F, Ahmed; Hillman, Febrian; Al-Muhtaseb, Shaheen A.; Jeong, Hae-Kwon (December 2019, Journal of Nanomaterials)

   null (Ed.)

   ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 are utilized in adsorbing nitrogen (N 2 ), methane (CH 4 ), and carbon dioxide (CO 2 ) gases at temperatures between 25 and 55°C and pressures up to ~1 MPa. Equilibrium adsorption isotherms and adsorption kinetics are studied. The dual-site Langmuir equation is employed to correlate the nonisothermal adsorption equilibrium behavior. Generally, N 2 showed the lowest equilibrium adsorption quantity on the three samples, whereas CO 2 showed the highest equilibrium adsorption capacity. Amid the ZIF samples, the biggest adsorption quantities of N 2 and CH 4 were onto Zn/Co-ZIF-8, whereas the highest adsorption quantity of CO 2 was on ZIF-8. The isosteric heats of adsorbing these gases on ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 were examined. Moreover, the overall mass transfer coefficients of adsorption at different temperatures were investigated. 

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2. Plasma-Induced Catalytic Conversion of Nitrogen and Hydrogen to Ammonia over Zeolitic Imidazolate Frameworks ZIF-8 and ZIF-67

   https://doi.org/doi.org/10.1021/acsami.1c03115.s001  

   Fnu Gorky, Jolie M. (April 2021, ACS applied materials interfaces)

   null (Ed.)

   Microporous crystals have emerged as highly appealing catalytic materials for the plasma catalytic synthesis of ammonia. Herein, we demonstrate that zeolitic imidazolate frameworks (ZIFs) can be employed as efficient catalysts for the cold plasma ammonia synthesis using an atmospheric dielectric barrier discharge reactor. We studied two prototypical ZIFs denoted as ZIF-8 and ZIF-67, with a uniform window pore aperture of 3.4 Å. The resultant ZIFs displayed ammonia synthesis rates as high as 42.16 μmol NH3/min gcat. ZIF-8 displayed remarkable stability upon recycling. The dipole–dipole interactions between the polar ammonia molecules and the polar walls of the studied ZIFs led to relatively low ammonia uptakes, low storage capacity, and high observed ammonia synthesis rates. Both ZIFs outperform other microporous crystals including zeolites and conventional oxides in terms of ammonia production. Furthermore, we demonstrate that the addition of argon to the reactor chamber can be an effective strategy to improve the plasma environment. Specifically, the presence of argon helped to improve the plasma uniformity, making the reaction system more energy efficient by operating at a low specific energy input range allowing abundant formation of nitrogen vibrational species. 

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3. Plasma-Induced Catalytic Conversion of Nitrogen and Hydrogen to Ammonia over Zeolitic Imidazolate Frameworks ZIF‐8 and ZIF-67

   https://doi.org/https://doi.org/10.1021/acsami.1c03115  

   Fnu Gorky; Jolie M. Lucero; James M. Crawford; Beth Blake; Moises A. Carreon; and Maria L. Carreon (July 2021, ACS applied materials interfaces)

   Microporous crystals have emerged as highly appealing catalytic materials for the plasma catalytic synthesis of ammonia. Herein, we demonstrate that zeolitic imidazolate frameworks (ZIFs) can be employed as efficient catalysts for the cold plasma ammonia synthesis using an atmospheric dielectric barrier discharge reactor. We studied two prototypical ZIFs denoted as ZIF-8 and ZIF-67, with a uniform window pore aperture of 3.4 Å. The resultant ZIFs displayed ammonia synthesis rates as high as 42.16 μmol NH3/min gcat. ZIF-8 displayed remarkable stability upon recycling. The dipole−dipole inter- actions between the polar ammonia molecules and the polar walls of the studied ZIFs led to relatively low ammonia uptakes, low storage capacity, and high observed ammonia synthesis rates. Both ZIFs outperform other microporous crystals including zeolites and conventional oxides in terms of ammonia production. Furthermore, we demonstrate that the addition of argon to the reactor chamber can be an effective strategy to improve the plasma environment. Specifically, the presence of argon helped to improve the plasma uniformity, making the reaction system more energy efficient by operating at a low specific energy input range allowing abundant formation of nitrogen vibrational species. KEYWORDS: nonthermal plasma, plasma catalysis, ammonia synthesis, zeolitic imidazolate frameworks, ammonia adsorption effect 

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4. Synthesis of ZIF-11 Crystals by Microwave Heating

   https://doi.org/10.1039/C9NJ04589A  

   J. Lucero, T. Self (January 2020, New journal of chemistry)
5. Understanding the Nucleation and Growth of ZIF-8 Polymorphs

   https://doi.org/10.1021/acs.cgd.4c00194  

   Talosig, A Rain; Wang, Fangni; Mulvey, Justin T; Carpenter, Brooke P; Olivas, Elisa M; Katz, Benjamin B; Zhu, Chenhui; Patterson, Joseph P (May 2024, Crystal Growth & Design)