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Clostridium butyricum DL07's proposal for co-production of 1,3-propanediol, biohydrogen, and micro-nano CaCO 3 was based on Ca 2 as a CO2 capture agent and pH regulator. In addition, the ratio of H 2 to CO 2 in exhaust gas increased by 152-fold in the 5 M Ca 2 group compared to 5 M NaOH as the CO2 capture agent. Green hydrogen in exhaust gas ranged from 17. 2% to 20. 2%, with the remainder being N2 with negligible CO 2 emissions. Micro-nano calcite particles of CaCO 3 in the range of 300 nm to 20 u00b5 million were created simultaneously during CO 2 capture in situ. Moreover, the percentages of soluble salts and proteins in the fermentation broth of 5 M Ca 2 groups were significantly reduced by 53. 6% and 44. 1%, respectively, when compared to 5M NaOH group.
Source link: https://europepmc.org/article/MED/36057610
Wasted coal liquefaction residual was used to synthesize activated carbon fibers for CO 2 capture, and the functionality of the newly developed ACFs were optimized by changing the activation conditions, including the reaction temperature and soaking time. In addition, static and dynamic adsorption experiments were carried out to determine CO 2's adsorption capacity in flue gas. ACFs' adsorption isotherm of CO 2 according to the Langmuir model, indicating that the adsorption process of CO 2 by ACFs can be traced to monolayer adsorption. ACFs-920-3 had the highest adsorption capacity for CO 2 in flue gas, according to the dynamic adsorption experiment, and adsorption equilibrium was achieved after 7 minutes of adsorption. The as-synthesized ACFs' adsorption process of CO 2 in flue gas conforms well to the pseudosecond kinetic model.
Source link: https://europepmc.org/article/MED/36058269
It's a difficult problem to reduce CO 2 emissions. The removal of CO 2 from combustion processes is associated with high energy demand and decreases the effectiveness of power-production plants. A numerical model of the separation process that is based on a network flow problem is used to illustrate the core of the scheme. On a case study, the model's ability to optimize the process was demonstrated, and the results show that tuning can dramatically reduce the process's energy consumption. With state-of-the-art membranes based on the Robeson upper bound and three-stage process, separation of 90% of CO 2 at the purity of 95% with initial flue gas with 13% CO 2 was achieved. With final CO 2 reduction, the minimum power consumption was 1. 74 GJ/t CO2 was 1. 74 GJ/t CO2.
Source link: https://europepmc.org/article/MED/36056498
Carbon capture was sparked enormous interest as a ubiquitous family of enzymes with high success in turning carbon dioxide into bicarbonate. Nevertheless, the high cost and operational incompatibility of CAs undermines their practical use, and the use of CAs is mainly restricted to aqueous situations where CO2 -to-bicarbonate conversion is possible. Here we introduce a new series of high-performance gas separation membranes with CO 2 philic behavior, capitalizing on the chemical motif that endows CA-like active sites. His-NPs' imidazole and amine functionalities increased the solubility of CO 2 molecules in the polymer matrix's solubility. We produced a CO 2 permeability of > 145 Barrer and a CO 2 /N 2 selectivity of > 95 with retained performance under humid continuous gas feeds, with retained results under humid continuous gas feeds at a filling ratio as low as 3 wt %.
Source link: https://europepmc.org/article/MED/35969637
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