Efficient cycloaddition of epoxides and carbon dioxide over novel organic–inorganic hybrid zeolite catalysts

2014 ◽  
Vol 50 (99) ◽  
pp. 15764-15767 ◽  
Author(s):  
Chen-Geng Li ◽  
Le Xu ◽  
Peng Wu ◽  
Haihong Wu ◽  
Mingyuan He
Keyword(s):  
Carbon Dioxide ◽  
Quaternary Ammonium ◽  
Zeolite Catalysts ◽  
Inorganic Hybrid ◽  
Mfi Zeolites

The organic–inorganic lamellar MFI zeolites, containing embedded Gemini-type quaternary ammonium groups and changeable halogen anions, serve as active and reusable catalysts for the cycloaddition of epoxides and carbon dioxide.

scholarly journals Reforming of Methane with Carbon Dioxide over Nickel-loaded Zeolite Catalysts.

2002 ◽  
Vol 45 (5) ◽  
pp. 314-320 ◽  
Author(s):  
Hiroharu INOUE ◽  
Nobuyuki HATANAKA ◽  
Koh KIDENA ◽  
Satoru MURATA ◽  
Masakatsu NOMURA
Keyword(s):  
Carbon Dioxide ◽  
Zeolite Catalysts

scholarly journals Synthesis and Comprehensive Study of Quaternary-Ammonium-Based Sorbents for Natural Gas Sweetening

Environments ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 134
Author(s):  
Maria E. Atlaskina ◽  
Artem A. Atlaskin ◽  
Olga V. Kazarina ◽  
Anton N. Petukhov ◽  
Dmitriy M. Zarubin ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquids ◽  
Quaternary Ammonium ◽  
Physical Nature ◽  
Chemical Absorption ◽  
Solid Sorbents ◽  
Environmental Care ◽  
Carbon Dioxide Sorption ◽  
Ionic Compounds ◽  
Ft Ir

The present study provides a solvent-free organic synthesis of quaternary ammonium salts: bis(2-hydroxyethyl)dimethylammonium taurate ([BHEDMA][Tau]) and bis(2-hydroxyethyl)dimethylammonium acetate ([BHEDMA][OAc]). These ionic compounds are promising materials for carbon dioxide capture processes, as mono sorbents, supplemental components in the conventional process of chemical absorption, and in the combined membrane approach for improving sorption efficiency. The synthesized compounds were characterized by 1H NMR and FT-IR spectroscopies and elemental analysis. Afterward, the sorption properties of the compounds were evaluated using the inverse gas chromatography (IGC) method, and their thermodynamic parameters were calculated in the temperature range of 303.15–333.15 K. The enthalpy change (∆sH) was less than 80 kJ·mol−1, indicated by the physical nature of sorption and also proved by FT-IR. Henry’s law constant in regard to carbon dioxide at 303.15 K was equal to 4.76 MPa for [BHEDMA][Tau], being almost 2.5 lower than for [BHEDMA][OAc] (11.55 MPa). The calculated carbon dioxide sorption capacity for [BHEDMA][Tau] and [BHEDMA][OAc] amounted to 0.58 and 0.30 mmol·g−1, respectively. The obtained parameters are comparable with the known solid sorbents and ionic liquids used for CO2 capture. However, the synthesized compounds, combining the advantages of both alkanolamines and ionic liquids, contain no fluorine in their structure and thus match the principles of environmental care.

Carbon Encapsulation of Organic–Inorganic Hybrid Perovskite toward Efficient and Stable Photo‐Electrochemical Carbon Dioxide Reduction

2020 ◽  
Vol 10 (44) ◽  
pp. 2002105
Author(s):  
Hefeng Zhang ◽  
Yu Chen ◽  
Hong Wang ◽  
Hui Wang ◽  
Weiguang Ma ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Reduction ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite

Quaternary ammonium hydroxide as a metal-free and halogen-free catalyst for the synthesis of cyclic carbonates from epoxides and carbon dioxide

2015 ◽  
Vol 5 (4) ◽  
pp. 2314-2321 ◽  
Author(s):  
Tadashi Ema ◽  
Kazuki Fukuhara ◽  
Takashi Sakai ◽  
Masaki Ohbo ◽  
Fu-Quan Bai ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Quaternary Ammonium ◽  
Ammonium Hydroxide ◽  
Solvent Free ◽  
Cyclic Carbonates ◽  
Tetrabutylammonium Hydroxide ◽  
Metal Free ◽  
Good Catalyst ◽  
Solvent Free Conditions ◽  
Halogen Free

Tetrabutylammonium hydroxide (TBAH) acted as a good catalyst for the formation of cyclic carbonates from epoxides and CO2 under solvent-free conditions.

scholarly journals Theoretical Studies on the Mechanism of deNOx Process in Cu–Zn Bimetallic System—Comparison of FAU and MFI Zeolites

Molecules ◽  
2022 ◽  
Vol 27 (1) ◽  
pp. 300
Author(s):  
Izabela Kurzydym ◽  
Izabela Czekaj
Keyword(s):  
Density Functional ◽  
Co Adsorption ◽  
Computer Calculation ◽  
Zeolite Catalysts ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Hydrothermal Conditions ◽  
Fau Zeolite ◽  
Cu Catalyst ◽  
Mfi Zeolites

In the present study we propose a more promising catalyst for the deNOx process to eliminate harmful nitrogen oxides from the environment. The study was performed with a computer calculation using density functional theory (DFT) based on an ab initio method. Two zeolite catalysts, FAU and MFI, were selected with additional Cu–O–Zn bimetallic dimer adsorbed inside the pores of both zeolites. Based on the analysis of preliminary studies, the most probable way of co-adsorption of nitric oxide and ammonia was selected, which became the initial configuration for the reaction mechanism. Two types of mechanisms were proposed: with hydroxyl groups on a bridged position of the dimer or a hydroxyl group on one of the metal atoms of the dimer. Based on the results, it was determined that the FAU zeolite with a bimetallic dimer and an OH group on the zinc atom was the most efficient configuration with a relatively low energy barrier. The real advantage of the Cu–Zn system over FAU and MFI in hydrothermal conditions has been demonstrated in comparison to a conventional Cu–Cu catalyst.

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