CO₂ Capture and Use in a Novel Coal-Based Polygeneration System

A novel coal-based polygeneration system with CO₂ recycling for CO₂ capture is proposed. Two CO₂ recycling schemes exist in this system. In the first, CO₂ is recycled into the gasifier as the gasifying agent. In the second, CO₂ is recycled into the gas turbine as a diluent. Compared with conventional CCS systems, this new system avoids the use of water gas shift and CO₂ separation processes to capture CO₂, and, more importantly, a part of CO₂ can be converted into CO in coal gasification and be used to synthesize chemicals, improving carbon element utilization and chemical output. By means of exergy analysis, comparison with four conventional single production systems shows that the proposed system provides more than 11% in energy savings and more than 25% in capital investment saving. The exergy efficiency, CO₂ emission, and internal rate of return may be expected to reach 46.3%, 0.47 <i>t</i>·(<i>t</i>-coal)⁻¹ and 14.76%, respectively

Flow chart of selection process for eligible articles.

<p>Flow chart of selection process for eligible articles.</p

Forest plots of the sensitivity and speci­ficity for Ber-EP4 in the diagnosis of metastatic adenocarcinoma for all studies.

<p>The point estimates of sensitivity and specificity for each study are shown as solid circles and the size of each solid circle indicates the sample size of each study. Error bars are 95% confidence intervals.</p

Summary of the methodological quality assessment of the included studies according to QUADAS-2 criteria.

<p>LR: low risk; HR: high risk; UR: unclear risk; LC: low concern; HC: high concern; UC: unclear concern.</p><p>Summary of the methodological quality assessment of the included studies according to QUADAS-2 criteria.</p

Summary of the studies included in the meta-analysis.

<p>TP, true positive; FP, false positive; FN, false negative; TN, true negative.</p><p>Summary of the studies included in the meta-analysis.</p

Summary receiver operating characteristic curve for Ber-EP4 in the diagnosis of metastatic adenocarcinoma for all studies.

<p>Solid circles represent each study included in the meta-analysis. The size of each solid circle indicates the size of each study. The regression SROC curve summarizes the overall diagnostic accuracy.</p

Funnel graph for the assessment of potential publication bias of the 29 included studies.

<p>The funnel graph plots the log of the diagnostic odds ratio (DOR) against the standard error of the log of the DOR (an indicator of sample size). Solid circles represent each study in the meta-analysis. The line indicates the regression line.</p

DataSheet1_Ti/Ni co-doped perovskite cathode with excellent catalytic activity and CO2 chemisorption ability via nanocatalysts exsolution for solid oxide electrolysis cell.docx

Carbon dioxide (CO2) gas is the main cause of global warming and has a significant effect on both climate change and human health. In this study, Ni/Ti co-doped Sr1.95Fe1.2Ni0.1Ti0.2Mo0.5O6-δ (SFNTM) double perovskite oxides were prepared and used as solid oxide electrolysis cell (SOEC) cathode materials for effective CO2 reduction. Ti-doping enhances the structural stability of the cathode material and increases the oxygen vacancy concentration. After treatment in 10% H2/Ar at 800°C, Ni nanoparticles were exsolved in situ on the SFNTM surface (Ni@SFNTM), thereby improving its chemisorption and activation capacity for CO2. Modified by the Ti-doping and the in situ exsolved Ni nanoparticles, the single cell with Ni@SFNMT cathode exhibits improved catalytic activity for CO2 reduction, exhibiting a current density of 2.54 A cm−2 at 1.8 V and 800°C. Furthermore, the single cell shows excellent stability after 100 h at 1.4 V, indicating that Ni/Ti co-doping is an effective strategy for designing novel cathode material with high electrochemical performance for SOEC.</p

Ionic-Liquid-Assisted One-Step Construction of Mesoporous Metal–Organic Frameworks

The synthesis of ionic-mesoporous-metal–organic frameworks (ionic-meso-MOFs) has received considerable interest in the fields of macromolecular adsorption, acid–base catalysis, ionic conductivity, etc.; yet, their synthesis still presents significant difficulties. In this study, functionalized mesoporous MIL-101-ILs (Cr) was facilely constructed via an in situ self-assembly method by using aromatic-anion-functionalized ionic liquids (ILs) as competitive ligands. It has been demonstrated that the inclusion of an aromatic moiety into an IL improves the coordination ability and is advantageous for the anchoring of ILs on Cr3+ via amino-metal coordination. Thus, ionic-meso-MOFs with a specific surface area of 441.9–624.9 cm2/g and an average pore diameter of 5.5 to 8.4 nm were successfully synthesized. Because of the presence of open Lewis acidic metal sites on the MOFs and basic active sites on the ILs, the resulting ionic-meso-MOFs demonstrated both an acid–base cooperative effect and a mesoporous structure, indicating a high potential for acid–base catalysis. This in situ synthesis procedure for ionic mesoporous MOFs offers a simple method for developing and fabricating multifunctional mesoporous materials

Ionic Liquid-Functionalized Metal–Organic Frameworks/Covalent–Organic Frameworks for CO₂ Capture and Conversion

CO2 capture and conversion have garnered worldwide attention in view of the objective of sustainable development and carbon neutrality. Recently, ionic liquid-functionalized metal–organic frameworks (MOFs) or covalent–organic frameworks (COFs) (MOFs/COFs) offer a rising platform for the effective CO2 separation from specific gas mixture and CO2 conversion into value-added chemicals. Benefiting from the synergistic effect offered by ILs and MOFs/COFs, IL-MOFs/COFs exhibit better exceptional adsorption/catalytic performance than pristine MOFs/COFs or ILs. Herein, the review intends to establish a primary database for the recently emerging IL-MOFs/COFs in CO2 capture and conversion, covering the functionalization strategies, interaction between ILs and MOFs/COFs, and the representative applications, aiding in the rational design and optimization of novel IL-MOFs/COFs with exceptional properties for real-world application. Along this line, CO2 capture from different systems (CO2/N2, CO2/CH4, and CO2/C2H2) and further conversion into multiproducts (cyclic carbonate, hydrocarbon, alcohol, and others), along with the mechanism insight into ILs and MOFs/COFs in such adsorption/catalytic processes are summarized and discussed. Furthermore, the challenges and prospects of IL-MOFs/COFs in such emerging and topical fields have been elaborated