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| 1 | Efficient MgO-doped CaO sorbent pellets for high temperature CO_(2) capture显示文摘Novel MgO-doped CaO sorbent pellets were prepared by gel-casting and wet impregnation.The effect of Na^(+) and MgO on the structure and CO_(2) adsorption performance of CaO sorbent pellets was elucidated.MgOdoped CaO sorbent pellets with the diameter range of 0.5-1.5 mm exhibited an excellent capacity for CO_(2) adsorption and adsorption rate due to the homogeneous dispersion of MgO in the sorbent pellets and its effects on the physical structure of sorbents.The results show that MgO can effectively inhibit the sintering of CaO and retain the adsorption capacity of sorbents during multiple adsorption-desorption cycles.The presence of mesopores and macropores resulted in appreciable change of volume from CaO(16.7 cm^(3)·mol^(-1))to CaCO3(36.9 cm^(3)·mol^(-1))over repeated operation cycles.Ca2Mg1 sorbent pellets exhibited favorable CO_(2) capture capacity(9.49 mmol·g^(-1)),average adsorption rate(0.32 mmol·g^(-1)·min^(-1)) and conversion rate of CaO(74.83%) after 30 cycles. | Zhihong Xu Tao Jiang Hao Zhang Yujun Zhao Xinbin Ma Shengping Wang | 2021 | Frontiers of Chemical Science and Engineering2021，15，3： | 2 |
| 2 | Efficient CO_(2) adsorption and mechanism on nitrogen-doped porous carbons显示文摘In this work,nitrogen-doped porous carbons(NACs)were fabricated as an adsorbent by urea modification and KOH activation.The CO_(2) adsorption mechanism for the NACs was then explored.The NACs are found to present a large specific surface area(1920.72-3078.99 m2·g^(-1))and high micropore percentage(61.60%-76.23%).Under a pressure of 1 bar,sample NAC-650-650 shows the highest CO_(2) adsorption capacity up to 5.96 and 3.92 mmol·g^(-1) at 0 and 25℃,respectively.In addition,the CO_(2)/N_(2) selectivity of NAC-650-650 is 79.93,much higher than the value of 49.77 obtained for the nonnitrogen-doped carbon AC-650-650.The CO_(2) adsorption capacity of the NAC-650-650 sample maintains over 97% after ten cycles.Analysis of the results show that the CO_(2) capacity of the NACs has a linear correlation(R^(2)=0.9633)with the cumulative pore volume for a pore size less than 1.02 nm.The presence of nitrogen and oxygen enhances the CO_(2)/N_(2) selectivity,and pyrrole-N and hydroxy groups contribute more to the CO_(2) adsorption.In situ Fourier transform infrared spectra analysis indicates that CO_(2) is adsorbed onto the NACs as a gas.Furthermore,the physical adsorption mechanism is confirmed by adsorption kinetic models and the isosteric heat,and it is found to be controlled by CO_(2) diffusion.The CO_(2) adsorption kinetics for NACs at room temperature and in pure CO_(2) is in accordance with the pseudo-first-order model and Avramís fractional-order kinetic model. | Yanxia Wang Xiude Hu Tuo Guo Jian Hao Chongdian Si Qingjie Guo | 2021 | Frontiers of Chemical Science and Engineering2021，15，3： | 1 |
| 3 | Optimization of electrochemically synthesized Cu3(BTC)2 by Taguchi method for CO2/N2 separation and data validation through artificial neural network modeling显示文摘Cu(BTC),a common type of metal organic framework(MOF),was synthesized through electrochemical route for CO capture and its separation from N.Taguchi method was employed for optimization of key parameters affecting the synthesis of Cu(BTC).The results indicated that the optimum synthesis conditions with the highest CO selectivity can be obtained using 1 g of ligand,applied voltage of 25 V,synthesis time of 2 h,and electrode length of 3 cm.The single gas sorption capacity of the synthetized microstructure Cu(BTC)for CO(at 298 K and 1 bar)was a considerable value of 4.40 mmol·g.The isosteric heat of adsorption of both gases was calculated by inserting temperature-dependent form of Langmuir isotherm model in the Clausius-Clapeyron equation.The adsorption of CO/N binary mixture with a concentration ratio of 15/85 vol-%was also studied experimentally and the result was in a good agreement with the predicted value of IAST method.Moreover,Cu(BTC)showed no considerable loss in CO adsorption after six sequential cycles.In addition,artificial neural networks(ANNs)were also applied to predict the separation behavior of CO/N mixture by MOFs and the results revealed that ANNs could serve as an appropriate tool to predict the adsorptive selectivity of the binary gas mixture in the absence of experimental data. | Kasra Pirzadeh Ali Asghar Ghoreyshi Mostafa Rahimnejad Maedeh Mohammadi | 2020 | Frontiers of Chemical Science and Engineering2020，14，2： | 1 |
| 4 | 碳基二氧化碳吸附材料研究进展显示文摘近年来,以CO_(2)为主的温室气体在大气中的浓度持续增加,温室效应日益加剧。二氧化碳捕集、利用与封存(CCUS)是实现碳中和的托底技术,二氧化碳捕集成本占整个CCUS全链条的70%左右,开发低成本二氧化碳捕集技术是推动CCUS技术应用推广的重中之重。虽已开发多种先进材料(如沸石、金属有机骨架、介孔二氧化硅和聚合物)以应对二氧化碳捕集,但对活性炭(ACs)的研究仍是主流。碳材料具有来源广泛、价格低廉、孔隙结构丰富、物理化学性质稳定等优点,是一种极具应用潜力的二氧化碳吸附材料。现有碳基吸附材料仍存在二氧化碳吸附容量低、吸附选择性差等缺点,制约了其在二氧化碳捕集领域的应用,国内外研究人员开展了大量的碳基吸附材料改性工作,以满足工业应用需求。通过梳理碳基吸附材料造孔和表面改性两方面介绍了近几年国内外研究进展,总结了现有的物理活化法、化学活化法、模板法等造孔方法以及表面氧化、氮杂化、硫杂化、金属杂化等改性方法,并全面分析了不同方法的优缺点。针对目前的造孔技术,综合考虑选用更低成本的软模板剂和更易处理的硬模板剂;而在众多改性方法中,氮杂化改性和金属杂化改性目前研究较多,也是最有可能实现碳基吸附材料大规模放大生产的途径之一。 | 于航 孟洪 杨祥富 金君素 | 2023 | 洁净煤技术2023，29，11： | 1 |
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