The development of porous materials as highly efficient CO2 adsorbents is a promising and continuously expanding research area, aiming to provide more efficient energy alternatives and help maintain a clean environment. Currently, fossil fuel combustion is the primary cause of the increase in atmospheric CO2 content and a significant contributor to global warming, because CO2 is a major greenhouse gas considered to pose a large environmental threat. The current level of atmospheric CO2 exceeds 415 ppm, which highlights the need to reduce the further release of this gas and prevent it from entering the carbon cycle. Many porous adsorbents have been developed as CO2 capture agents; however, they are only partially effective and need to be replaced with more effective porous materials to tackle the global climate concerns due to the presence of CO2 in the atmosphere. Herein, we review the existing CO2 capture techniques as well as related tools and materials, highlighting the recent progress in the use of zeolites for this purpose and indicating their significant potential for CO2 capture owing to their high porosity, ultra-small pores, structural diversity, high stability, and excellent recyclability and chemical reactivity.

Utilization of zeolites as CO2 capturing agents: Advances and future perspectives

Bio-based (chitosan/PVA/ZnO) nanocomposites film: Thermally stable and photoluminescence material for removal of organic dye

Advancement in porous adsorbents for post-combustion CO2 capture

For many years, capturing, storing or sequestering CO2 from concentrated emission sources or from air has been a powerful technique for reducing atmospheric CO2. Moreover, the use of CO2 as a C1 building block to mitigate CO2 emissions and, at the same time, produce sustainable chemicals or fuels is a challenging and promising alternative to meet global demand for chemicals and energy. Hence, the chemical incorporation and conversion of CO2 into valuable chemicals has received much attention in the last decade, since CO2 is an abundant, inexpensive, nontoxic, nonflammable, and renewable one-carbon building block. Nevertheless, CO2 is the most oxidized form of carbon, thermodynamically the most stable form and kinetically inert. Consequently, the chemical conversion of CO2 requires highly reactive, rich-energy substrates, highly stable products to be formed or harder reaction conditions. The use of catalysts constitutes an important tool in the development of sustainable chemistry, since catalysts increase the rate of the reaction without modifying the overall standard Gibbs energy in the reaction. Therefore, special attention has been paid to catalysis, and in particular to heterogeneous catalysis because of its environmentally friendly and recyclable nature attributed to simple separation and recovery, as well as its applicability to continuous reactor operations. Focusing on heterogeneous catalysts, we decided to center on zeolite and ordered mesoporous materials due to their high thermal and chemical stability and versatility, which make them good candidates for the design and development of catalysts for CO2 conversion. In the present review, we analyze the state of the art in the last 25 years and the potential opportunities for using zeolite and OMS (ordered mesoporous silica) based materials to convert CO2 into valuable chemicals essential for our daily lives and fuels, and to pave the way towards reducing carbon footprint. In this review, we have compiled, to the best of our knowledge, the different reactions involving catalysts based on zeolites and OMS to convert CO2 into cyclic and dialkyl carbonates, acyclic carbamates, 2-oxazolidones, carboxylic acids, methanol, dimethylether, methane, higher alcohols (C2+OH), C2+ (gasoline, olefins and aromatics), syngas (RWGS, dry reforming of methane and alcohols), olefins (oxidative dehydrogenation of alkanes) and simple fuels by photoreduction. The use of advanced zeolite and OMS-based materials, and the development of new processes and technologies should provide a new impulse to boost the conversion of CO2 into chemicals and fuels.

Advanced zeolite and ordered mesoporous silica-based catalysts for the conversion of CO2 to chemicals and fuels.

Recent advances in the use of catalysts based on natural products for the conversion of CO2 into cyclic carbonates

Mesoporous zeolite-chitosan composite for enhanced capture and catalytic activity in chemical fixation of CO2

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Mesoporous zeolite-chitosan composite for enhanced capture and catalytic activity in chemical fixation of CO2