Advanced zeolite and ordered mesoporous silica-based catalysts for the conversion of CO₂to chemicals and fuels

Abstract

This review summarizes the use of zeolites and ordered mesoporous silica-based catalysts, and the development of new processes and technologies to boost the conversion of CO2 into chemicals and fuels.

Highly efficient fixation of carbon dioxide into 2-oxazolidinones under mild conditions by using a reusable ionic liquid/CuI catalyst system

“…S63 and S64 (see the ESI † for details). In 19 F NMR, we observed a shift in the signal before and after the introduction of CO 2 , indicating the formation of a complex between PF 6 − and CO 2 . Therefore, [PF 6 ] − was proposed to interact with CO 2 .…”

“…[BMMIM][PF 6 ] was prepared under optimal conditions without components 1-3, and two temperatures were tested. In addition, we have performed additional experiments where [BMMIM][PF 6 ] was dissolved in DMSO-d 6 and subjected to CO 2 , followed by 19 F and 31 P NMR analysis as shown in Fig. S63 and S64 (see the ESI † for details).…”

“…CO 2 is abundant, nontoxic, and nonflammable, albeit thermodynamically stable and kinetically inert, so harsh conditions are usually needed. 19 2-Oxazolidinones are important heterocyclic compounds, used as chiral auxiliaries in organic synthesis 20 and as antibacterial drugs in pharmaceutical chemistry. 21 They are also the key intermediates in many CO 2 conversions in the presence of catalysts.…”

Covalent organic frameworks embedding single cadmium sites for efficient carboxylative cyclization of CO2with propargylic amines

“…The chemical conversion of carbon dioxide (CO 2 ) into valueadded products has been spurred by increasing atmospheric CO 2 concentration, emerging environmental problems, and growing energy demands. [1][2][3] Thus, much attention has been paid to the chemical fixation of CO 2 over the past decades. Although it is challenging to activate and utilize CO 2 owing to the difficulties associated with the chemical inertness of CO 2 and high kinetic barriers, 4 several innovative methods using CO 2 as a feedstock have also emerged for commodity synthesis such as urea, carboxylic acid, carbonate, formamide, aldehyde, etc.…”

Adsorption of Carbon Dioxide in Non-Löwenstein Zeolites

“…To this end, we used Monte Carlo simulation, which has been proven a powerful tool to study adsorption phenomena in nanoporous materials. − As novelty, we also considered the non-Löwenstein case, which to the best of our knowledge has never been addressed. Although current synthesis techniques do not allow for a tailored placement of the aluminum atoms in zeolites, experimental methods are rapidly improving, which may enable us to achieve significant control over the aluminum distribution in the near future. This way, we aim to exploit further the adsorption properties of zeolites, emphasizing the influence of non-Löwenstein bonds on the adsorption performance of the framework.…”