Silica grafted ammonium salts based on DABCO as heterogeneous catalysts for cyclic carbonate synthesis from carbon dioxide and epoxides

RSC Advances ◽  
2015 ◽  
Vol 5 (29) ◽  
pp. 22373-22379 ◽  
Author(s):  
Abdol R. Hajipour ◽  
Yasaman Heidari ◽  
Gholamreza Kozehgary
Keyword(s):  
Carbon Dioxide ◽  
Organic Solvent ◽  
Heterogeneous Catalyst ◽  
Heterogeneous Catalysts ◽  
Cyclic Carbonate ◽  
Ammonium Salts ◽  
Functionalized Silica

DABCO based ammonium salts immobilized on functionalized silica proved to be an effective heterogeneous catalyst for the synthesis of cyclic carbonate from epoxide and CO2 without the utilization of any organic solvent and any additives.

Nicotine-derived ammonium salts as highly efficient catalysts for chemical fixation of carbon dioxide into cyclic carbonates under solvent-free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 61179-61183 ◽  
Author(s):  
Abdol R. Hajipour ◽  
Yasaman Heidari ◽  
Gholamreza Kozehgary
Keyword(s):  
Carbon Dioxide ◽  
Organic Solvent ◽  
Solvent Free ◽  
Ammonium Salts ◽  
Chemical Fixation ◽  
Cyclic Carbonates ◽  
Highly Efficient ◽  
Solvent Free Conditions ◽  
Recyclable Catalysts ◽  
Fixation Of Carbon Dioxide

Ammonium salts based on nicotine proved to be highly efficient and recyclable catalysts for the synthesis of cyclic carbonates from epoxides and CO2 without the utilization of any organic solvent and any additives.

scholarly journals Heterogeneous catalysts for cyclic carbonate synthesis from carbon dioxide and epoxides

2020 ◽  
Vol 26 ◽  
pp. 100365 ◽  
Author(s):  
Aryane A. Marciniak ◽  
Katie J. Lamb ◽  
Leonardo P. Ozorio ◽  
Claudio J.A. Mota ◽  
Michael North
Keyword(s):  
Carbon Dioxide ◽  
Heterogeneous Catalysts ◽  
Cyclic Carbonate

Catalysts for hydrogenation of CO2 into components of motor fuels

2020 ◽  
pp. 1-18
Author(s):  
Yu.V. Bilokopytov ◽  
◽  
S.L. Melnykova ◽  
N.Yu. Khimach ◽  
◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Heterogeneous Catalysts ◽  
Fossil Fuels ◽  
Catalyst Stability ◽  
Co2 Conversion ◽  
Active Components ◽  
Synthesis Conditions ◽  
Hydrogenation Of Co2 ◽  
Mesoporous Zeolites ◽  
Motor Fuels

CO2 is a harmful greenhouse gas, a product of chemical emissions, the combustion of fossil fuels and car exhausts, and it is a widely available source of carbon. The review considers various ways of hydrogenation of carbon dioxide into components of motor fuels - methanol, dimethyl ether, ethanol, hydrocarbons - in the presence of heterogeneous catalysts. At each route of conversion of CO2 (into oxygenates or hydrocarbons) the first stage is the formation of CO by the reverse water gas shift (rWGS) reaction, which must be taken into account when catalysts of process are choosing. The influence of chemical nature, specific surface area, particle size and interaction between catalyst components, as well as the method of its production on the CO2 conversion processes is analyzed. It is noted that the main active components of CO2 conversion into methanol are copper atoms and ions which interact with the oxide components of the catalyst. There is a positive effect of other metals oxides additives with strong basic centers on the surface on the activity of the traditional copper-zinc-aluminum oxide catalyst for the synthesis of methanol from the synthesis gas. The most active catalysts for the synthesis of DME from CO2 and H2 are bifunctional. These catalysts contain both a methanol synthesis catalyst and a dehydrating component, such as mesoporous zeolites with acid centers of weak and medium strength, evenly distributed on the surface. The synthesis of gasoline hydrocarbons (≥ C5) is carried out through the formation of CO or CH3OH and DME as intermediates on multifunctional catalysts, which also contain zeolites. Hydrogenation of CO2 into ethanol can be considered as an alternative to the synthesis of ethanol through the hydration of ethylene. High activation energy of carbon dioxide, harsh synthesis conditions as well as high selectivity for hydrocarbons, in particular methane remains the main problems. Further increase of selectivity and efficiency of carbon dioxide hydrogenation processes involves the use of nanocatalysts taking into account the mechanism of CO2 conversion reactions, development of methods for removing excess water as a by-product from the reaction zone and increasing catalyst stability over time.

The Synthesis and Application of Functionalized Mesoporous Silica SBA-15 as Heterogeneous Catalyst in Organic Synthesis

2020 ◽  
Vol 24 ◽  
Author(s):  
Ghodsi Mohammadi Ziarani ◽  
Shima Roshankar ◽  
Fatemeh Mohajer ◽  
Alireza Badiei
Keyword(s):  
Mesoporous Silica ◽  
Heterogeneous Catalyst ◽  
Organic Synthesis ◽  
Lewis Acid ◽  
Heterogeneous Catalysts ◽  
Organic Transformations ◽  
Functionalized Mesoporous Silica ◽  
Silica Nanomaterials ◽  
Wide Range ◽  
Target Molecules

Abstract:: Mesoporous silica nanomaterials provide an extraordinary advantage for making new and superior heterogeneous catalysts because of their surface silanol groups. The functionalized mesoporous SBA-15, such as acidic, basic, BrÖnsted, lewis acid, and chiral catalysts, are used for a wide range of organic synthesis. The importance of the chiral ligands, which were immobilized on the SBA-15, was mentioned in this review to achieve chiral products as valuable target molecules. Herein, their synthesis and application in different organic transformations are reviewed from 2016 till date 2020.

Characteristics of carbon dioxide desorption from MEA-based organic solvent absorbents

2021 ◽  
Vol 104 ◽  
pp. 103224
Author(s):  
Longtian Yin ◽  
Xiujin Li ◽  
Liang Zhang ◽  
Jianwei Li
Keyword(s):  
Carbon Dioxide ◽  
Organic Solvent

scholarly journals Bi-functional heterogeneous catalysts for carbon dioxide conversion: enhanced performances at low temperature

RSC Advances ◽  
2018 ◽  
Vol 8 (45) ◽  
pp. 25342-25350 ◽  
Author(s):  
Adrien Comès ◽  
Xavier Collard ◽  
Luca Fusaro ◽  
Luciano Atzori ◽  
M. Giorgia Cutrufello ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Reaction Temperature ◽  
Heterogeneous Catalysts ◽  
Cyclic Carbonates ◽  
Carbon Dioxide Conversion

Novel bi-functional catalysts allowing to decrease the reaction temperature for the synthesis of cyclic carbonates below 150 °C were successfully synthesized.

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