Materials Today Communications
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2022
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IF 3.662
Yanfei Jia,Jianwen Wei,Yuan Yuan,Xiaobin zhou,Linlin Geng,Lei Liao
Using KIT-6 as the silica source, a series of Li 4 SiO 4 adsorbents (KIT-6-Li 4 SiO 4 ) were synthesized by impregnation precipitation method for high temperature CO 2 capture. Then, the KIT-6-Li 4 SiO 4 -800–4 (KL-800–4) material, was selected to analyze the improvement of the adsorption performance by Ca 2+ /Na + eutectic doping modification. These adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and low temperature N 2 adsorption/desorption, and the CO 2 adsorption capacity of them was explored. At 600 °C and under 15 vol% CO 2 , KL-Ca0.03 and KL-Na0.06 sorbents resulted in a CO 2 uptake of 29.17 wt% and 35.35 wt% (close to the theoretical maximum), respectively，which are much higher than that of KL-800–4 (14.73 wt%). After 10 adsorption/desorption cycles, the adsorption capacity of KL-Na0.06 increased by 1.35 wt%. We found that KL-Na0.06 has more advantages compared with traditional lithium orthosilicate and undoped adsorbents, including lower energy consumption, higher CO 2 adsorption capacity and better cycling ability. Finally, the double exponential model had a high degree of fit for the adsorption of CO 2 by Li 4 SiO 4 .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Wentao Zheng,Jialing Chen,Yujiao Jia,Nengqi Sun,Shiping Wang,Xianku Wu,Xuehua Zhang
A series of 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU)/N-heterocyclic DESs aqueous solutions were designed and synthesized as CO 2 capture agents. They showed excellent performance in absorption capacity, especially for the low-pressure CO 2 . The CO 2 loads in the absorbents were higher than 1.0 mol/mol when the pressure was just 0.1 bar. Through a combination of 13 C NMR spectra, FT-IR spectra and absorption experiments, a novel absorption mechanism was proposed. It was the shuttling role of the carbamate generated from CO 2 and nitrogen heterocycles, along with the synergistic roles of the DBU and water, that caused the high absorption capacity of the DBU/N-heterocyclic DESs for CO 2 . Meanwhile, the thermodynamic parameters, the activation energy and the regeneration efficiency were all measured to estimate the absorption performance of the DBU/N-heterocyclic DESs aqueous solutions for low-concentration CO 2 .
研究领域:
化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Qiaoqi Guo,Ying Luo,Jun Xu,Lidan Deng,Zheng Wang,Hong He
Photocatalytic conversion of low-concentration CO 2 with H 2 O oxidation indicates an applicable way to achieve sustainable carbon cycling and solve the global warming problem. Enhancing photogenerated charge separation and surface adsorption and catalytic process of photocatalysts is the crucial point to compensate for the mass transfer limitation during low-concentration CO 2 conversion. Herein, a highly-crystalline Ag x Na 1−x TaO 3 -AgCl heterostructure composite was successfully fabricated via a one-step flux method. The in-situ formation of intimate heterojunction between Ag x Na 1−x TaO 3 and AgCl facilitated the separation and transfer of photogenerated charges. Moreover, the simultaneous introduction of Ag cations and AgCl components promoted the adsorption and activation of CO 2 on the photocatalyst surface. When combined with metallic Ag cocatalysts, the Ag x Na 1−x TaO 3 -AgCl heterostructure photocatalyst exhibited an improved activity for the overall reaction of CO 2 reduction and H 2 O oxidation at low CO 2 concentration condition. The design of photocatalysts active at low CO 2 concentration accounts for an alternative way to construct the practical CO 2 conversion system in the future.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Can Fang,Zhouxian Wang,Jingxu Han,Ning Zhou,Tonghao Dai,Zhifeng Dai,Yubing Xiong
Mounting concerns over climate change driven by anthropogenic greenhouse gas emissions have intensified demands for technologies that enable efficient conversion of CO2 into value-added chemicals. We report a bifunctional heterogeneous catalyst ZnBr2@PIL-VIm-Bpy, engineered through in situ metal coordination and radical polymerization, to co-anchor Lewis acidic ZnBr2-bipyridine complexes and nucleophilic imidazolium species within a porous ionic polymer matrix. Multimodal characterization (including solid-state NMR, XPS, FT-IR, etc.) verified the successful heterogenization of dual active sites in ZnBr2@PIL-VIm-Bpy. The obtained material exhibits excellent catalytic activity in CO2 cycloaddition reactions, and the conversion can reach 98.0% with a selectivity of 99.0% within 48 h at relatively mild conditions, comparable with those of homogeneous ionic liquids of VIm-Bpy and a binary catalytic system of ZnBr2+VIm-Bpy. The catalyst ZnBr2@PIL-VIm-Bpy can be easily separated from the product and can be reused at least 5 times without significant loss of catalytic activity, demonstrating excellent reusability and robustness. Especially, when the catalyst is applied to industrial flue gas conditions with low concentrations of CO2, a conversion of 85.5% can still be achieved in 96 h, which even surpasses the homogeneous catalysts of VIm-Bpy and ZnBr2+VIm-Bpy, confirming its outstanding catalytic performance in the elimination of low concentrations of CO2. This work establishes a heterogenization strategy combining enzymatic-like cooperativity with heterogeneous catalysts’ practicality, demonstrating particular promise for point-source carbon capture–utilization integration.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Yafei Guo,Changhai Li,Shouxiang Lu,Chuanwen Zhao
K 2 CO 3 supported on activated carbon (K 2 CO 3 /AC) shows promise as a potential candidate for removing low-concentration CO 2 from environmental control and life support systems (ECLSS). However, K 2 CO 3 /AC would suffer a decreased CO 2 sorption capacity due to sorbent deactivation in acid impurities such as SO 2 and NO 2 . To solve this problem, water vapor pretreatment, KOH addition and polyethyleneimine (PEI) modification were proposed as efficacious means for improving its CO 2 sorption capacity and mitigating the sorbent deactivation in these acid impurities. CO 2 sorption performances of the pretreated and modified sorbents were evaluated in a fixed-bed reactor under simulated ECLSS conditions of 20 °C, 1.0% CO 2 , 2.0% H 2 O, 30 ppm SO 2 , 20 ppm NO 2 and balanced N 2 . The mechanisms for sorbent deactivation inhibition by water vapor pretreatment, KOH addition and PEI modification were revealed by N 2 adsorption-desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FT-IR). Effects of water vapor pretreatment duration, KOH addition and PEI loading on sorbent deactivation inhibition performances were demonstrated. Furthermore, the long-term working stabilities of the pretreated and modified sorbents in impurities were evaluated. The results will provide fundamental support on practical application of K 2 CO 3 /AC for low-concentration CO 2 removal in ECLSS.
研究领域:
环境控制与生命支持系统
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气体吸附
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材料化学
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空气净化技术
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二氧化碳捕集
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）