APPLIED ENERGY
·
2017
·
IF 7.182
Xiaowen Zhang,Xin Zhang,Helei Liu,Wensheng Li,Min Xiao,Hongxia Gao,Zhiwu Liang
In this work, the regeneration of rich CO 2 -loaded monoethanolamine (MEA) solvent with two catalysts (e.g. SAPO-34 and SO 4 2− /TiO 2 ) was investigated in order to reduce the energy requirement for solvent regeneration. The regeneration behavior with and without catalyst of a 5M MEA solution with an initial CO 2 loading of 0.5 mol CO 2 /mol amine at 96 °C was studied to compare their CO 2 desorption rate and heat duties. The results show that the two solid acid catalysts can reduce the heat duty for solvent regeneration and increase the CO 2 desorption rate in comparison with blank test. The mechanism of CO 2 desorption with catalyst in 5M MEA was proposed based on the result of catalyst characterization (e.g. N 2 absorption/desorption experiment, Py-IR, NH 3 -TPD, FT-IR and XRD) to better understand the desorption process. The results indicate that SAPO-34 with the higher joint value of Brϕnsted/Lewis acid sites ratio (B/L) and mesopore surface area (MSA) shows the faster CO 2 desorption rate and lower heat duty than SO 4 2− /TiO 2 . Based on the experimental results, the addition of solid acid catalysts into amine solution could be considered as one of choices to reduce the heat duty for CO 2 desorption from CO 2 -loaded amine solvent.
研究领域:
化学工程
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环境科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jia Li,Wentao Liu,Yang Li,Zhi Liu,Yang Liu
A series of hierarchical flower-like CdS/carbon quantum dots/NiAl-LDH (CCL) photocatalyst have been successfully prepared to achieve efficient conversion of CO 2 -to-CO via a simple yet effective hydrothermal method. In the CCL, interspersed-CQDs not only increase the number of reactive sites but also reduce inner electronic impedance with the assistance of light reflecting-scattering effect. This significantly improves electron migration efficiency and inhibits the recombination of photoinduced electron-holes pairs. Without any sacrificial agent or photosensitizer, the sample of CCL-1 exhibits the highest CO evolution rate of 7.04 μmol·g −1 ·h −1 in water under simulated sunlight illumination with a large specific surface area (129.15 m 2 g −1 ) and an appropriate CQDs content of 15.2 wt%, which is 12.8- and 11.2-fold higher than those of pristine LDH, pure CdS, and many previously reported LDH-based counterparts. A type-Ⅱ interfacial charge transfer mechanism is proposed, where electrons migrate rapidly from CdS to LDH with highly-interspersed CQDs as unhindered electron conduction bridges. The present work outlines a simple and controllable LDH-based heterojunction, which give rise to superior photocatalytic activity for CO 2 photoreduction.
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
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Houde She,Ziwei Zhao,Wencai Bai,Jingwei Huang,Lei Wang,Qizhao Wang
Photocatalytic CO 2 reduction is considered as a feasible approach for solving greenhouse effect and energy shortage. Promoting electron migration and inhibiting electron-hole recombination are key challenges for efficient photocatalytic CO 2 reduction. Here, we successfully synthesized Cu:TiO 2 -CS composite as photocatalyst by a facile solvothermal method to improve the high-catalytic effect on CO 2 reduction. The as-prepared composite exhibits excellent photocatalytic CO 2 reduction performance under 300 W xenon lamp irradiation, with the yields of CO and CH 4 up to 4.48 μmol/g and 5.34 μmol/g, which is 10 times higher than that of TiO 2 . This impressive amelioration can be attributed to the synergy of organic polymer (chitosan) and inorganic material (Cu:TiO 2 ). This work may provide a constructing guidance in designing the composite photocatalyst concerning CO 2 photocatalytic reduction.
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
Sustainable Materials and Technologies
·
2022
·
IF 10.681
Boshu Jiang,Qiming Sun,Bachirou Guene Lougou,Hao Zhang,Xian Li,Zhibin Qu,Yong Shuai,Chi-Hwa Wang
The solar-driven thermochemical CO 2 conversion is an effective way to achieve the mission of carbon peaking and carbon neutrality . However, finding a material with excellent thermal stability, oxygen exchange capacity, and CO selectivity is one of the most important challenges in the thermochemical CO 2 conversion approach. This study investigated the solar thermochemical CO 2 -splitting characteristics through the synergistic thermal catalytic activity of CuO and NiFe 2 O 4 and the effect of SiC photothermal properties. The thermochemical redox cycling performance of CO 2 conversion through thermally activated catalysts was experimentally investigated via thermogravimetric combined quantum chemical calculations to provide comprehensive insights into the physicochemical principles underlying the thermochemical catalytic CO 2 -splitting. The X-ray diffraction, scanning electron microscopy, and energy spectrum detector technics were developed to gain detail on the crystal structure, surface morphology , and chemical composition changes in the reacting media. The newly synthesized composite material consisting of 25%CuO and 75%NiFe 2 O 4 (CNF-13) coated SiC porous skeleton resulted in higher CO 2 -splitting catalytic activity with an instantaneous CO production of 10.98mL ⋅ min ‐1 g CNF‐13 −1 and direct CO 2 -to-CO conversion rate of 33.9% at 1000–1200 K reaction temperature. The thermochemical CO 2 -splitting activity and redox stability of CNF-13@SiC was promoted by the photothermal properties of SiC support and the formation of Cu 2 O and Fe 3 O 4 new active material phases easing CO 2 reduction at low energy. This study provided experimental and theoretical findings that can be used as guidance for the fundamental research and application of CO 2 catalytic conversion into fuels through a solar thermochemical driven strategy.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Shunyang Yao,Zhi Li,Zhen Liu,Xiaodong Geng,Li Dai,Yanmei Wang
Porosity is the key factor in determining the CO2 capture capacity for porous carbon-based adsorbents, especially narrow micropores of less than 1.0 nm. Unfortunately, this desired feature is still a great challenge to tailor micropores by an effective, low-corrosion, and environmentally friendly activating agent. Herein, we reported a suitable dynamic porogen of CuCl2 to engineer microporous carbons rich in narrow micropores of <1.0 nm for solving the above problem. The porosity can be easily tuned by varying the concentration of the CuCl2 porogen. The resultant porous carbons exhibited a multiscale micropore size, high micropore volume, and suitable surface nitrogen doping content, especially high-proportioned ultromicropores of <0.7 nm. As adsorbents for capturing CO2, the obtained microporous carbons possess satisfactory CO2 uptake, moderate heat of CO2 adsorption, reasonable CO2/N2 selectivity, and easy regeneration. Our work proposes an alternative way to design porous carbon-based adsorbents for efficiently capturing CO2 from the postcombustion flue gases. More importantly, this work opens up an almost-zero cost and industrially friendly route to convert biowaste into high-added-value adsorbents for CO2 capture in an industrial practical application.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2023
·
IF 7.1
Peng Chen,Yun Wang,Jiazhen Liao,Yi Liang,Qingqing Ye,Yi Wang,Zhongwei Jiang,Chunhui Shan,Wendong Zhang,Fan Dong
The dissociation of H2O molecules plays an important role in producing protons for promoting hydrogenation reduction of CO2. Therefore, developing excellent photocatalysts to promote the dissociation of H2O molecules and reveal the effect mechanism is the key research direction to enhance CO2 reduction efficiency. In this work, we synthesized BiSbO4 with oxygen vacancies (OVs) to investigate the photocatalytic mechanism of CO2 conversion and H2O dissociation. Experimental results indicate that the introduction of OVs into BiSbO4 can enhance the absorption capacity of light, narrowing band gaps and impeding the recombination of photogenerated carriers. Importantly, the existence of OVs in BiSbO4 can promote the adsorption and activation of H2O molecules via the stronger covalent interaction, which facilitates the dissociation of H2O molecules to generate more protons and lowers the energy barriers of •COOH to improve the efficiency of CO2 reduction. This study reinforces our understanding of the principle of photocatalytic CO2 reduction and the important role of H2O dissociation in photocatalytic CO2 conversion.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
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IF 4.551
Tianjiao Wang,Hongyan Yao,Ningning Song,Yanchao Yang,Kaixiang Shi,Shaowei Guan
In recent years, linear polyimides of intrinsic microporosity have been widely used in the field of gas adsorption and separation because of their high BET surface area and microporous structures. Most of the microporous structures come from the twisted main-chain structures in the linear polyimides of intrinsic microporosity. Therefore, most linear polyimides (PI) without twisted structure have no porosity. Herein, to construct the linear polyimide with microporous structure, a sequence of microporous polyimides (PIs-CL) were constructed from the flexible linear polyimide precursors through the thermal crosslinking reaction. The polyimide precursors without twisted structure were synthesized from a well-designed diamine TFVBPA with cross-linkable ethynyl groups and several commercial dianhydrides (ODPA, BPDA, PMDA and 6FDA) by polycondensation to research the influence of the main-chain structure on the porous characters. The introduction of crosslinked structures gives the linear crosslinked polyimides (PIs-CL) with porous structures. The PIs-CL show obviously improved porosity (0.52–1.71 nm) and higher BET surface area (337–618 m 2 g −1 ) than those of the uncrosslinked polyimides (PIs). Moreover, PIs-CL have favorable CO 2 adsorption (5.7–9.3 wt%) as well as good CO 2 /N 2 selectivity (34.4–58.5) at 273 K, which are better than other polyimides materials. The introduction of crosslinked structures is an effective way to improve microporous porosity and gas sorption performance.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Bingquan Jia,Du Sun,Chengjin Li,Wei Zhao,Heliang Yao,Fangfang Xu,Fuqiang Huang
Metal cyanamides have an organic–inorganic hybrid structure similar to MOFs, which are expected to possess interesting catalytic properties. However, the structural complexity of these compounds sets up a big barrier to realize shape manipulation and further understanding on the structure–activity relationship. Here, we describe seed-mediated colloidal synthesis as a facile approach to obtain Ag2NCN near-monodisperse nanocrystals (NCs: nanorods, nanowires, and nanosheets) and their related CO2 catalytic activity. The control experiment unveiled the prominent role of the anisotropy for quasi-linear [NCN]2– anions in obtaining the desired growth order of different crystal planes. The formic acid production of nearly 20% Faradaic efficiency is observed when the as-prepared Ag2NCN NCs were tested for electrocatalytic CO2 reduction reactions. The exposed (200) planes exhibit evident higher catalytic activity compared to other planes, showing morphology-dependent activity. Our result reveals that the anisotropic structure of ions leads to their preferential growth of the NCs and thus may have greater implications for the shape-controlled synthesis of complex ions containing compounds and their related catalytic activity.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 14
·6720-6728
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IF 3.925
Jie Shen,Qi Sun,Jun Cao,Peng Wang,Weilin Jia,Suyang Wang,Ping Zhao,Zepeng Wang
Zeolite LTA, with high porosity and uniform pore distribution, has been widely used in the gas adsorption field. In this paper, a 1.38 nm thick two-dimensional zeolite LTA was synthesized from kaolin, changing the cubic morphology of the traditional zeolite LTA. SEM and TEM images showed that the zeolite LTA exhibited a lamellar structure. In a comparative experiment with CO2 adsorption at different temperatures, the 2D zeolite LTA with a large specific surface area could capture more CO2 than the conventional 3D zeolite LTA. In addition, the CO2/CH4 selectivity of the 2D Zeolite LTA was 76.78 at 298 K.
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
Nature Catalysis
·
2022
·Vol. 5
·期 6
·564-570
·
IF 40.706
Xie Yi,Ou Pengfei,Wang Xue,Xu Zhanyou,Li Yuguang C.,Wang Ziyun,Huang Jianan Erick,Wicks Joshua,McCallum Christopher,Wang Ning,Wang Yuhang,Chen Tianxiang,Lo Benedict T. W.,Sinton David,Yu Jimmy C.,Wang Ying,Sargent Edward H.
Renewable electricity-powered CO 2 reduction to multi-carbon (C 2+ ) products offers a promising route to realization of low-carbon-footprint fuels and chemicals. However, a major fraction of input CO 2 (>85%) is consumed by the electrolyte through reactions with hydroxide to form carbonate/bicarbonate in both alkaline and neutral reactors. Acidic conditions offer a solution to overcoming this limitation, but also promote the hydrogen evolution reaction. Here we report a design strategy that suppresses hydrogen evolution reaction activity by maximizing the co-adsorption of CO and CO 2 on Cu-based catalysts to weaken H* binding. Using density functional theory studies, we found Pd–Cu promising for selective C 2+ production over C 1 , with the lowest ∆ G OCCOH* and ∆ G OCCOH* - ∆ G CHO* . We synthesized Pd–Cu catalysts and report a crossover-free system (liquid product crossover <0.05%) with a Faradaic efficiency of 89 ± 4% for CO 2 to C 2+ at 500 mA cm −2 , simultaneous with single-pass CO 2 utilization of 60 ± 2% to C 2+ .
研究领域:
化学工程
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电化学
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可再生能源
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
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IF 5.31
Lidong Wang,Shanlong An,Qiangwei Li,Songhua Yu,Siyu Wu
Coal-fired flue gas is a major source of greenhouse gas CO 2 . Phase-change absorbents can be used to reduce energy consumption associated with regeneration during CO 2 capture. In this study, N,N-dimethylbutylamine (DMBA) and N,N-dimethylbutylamine (DEEA) were mixed to develop phase-change absorbents, and the reaction kinetics of CO 2 absorption in the absorbents were examined. A bubbling device was used to prepare phase-change absorbents with different CO 2 loading levels. The physico-chemical parameters of the absorbents under different conditions were specified, and the changes in the CO 2 loading of the upper and lower layers of the absorption solutions after a liquid–liquid separation were analyzed. A wetted-wall column was subsequently used to investigate the effects of temperature, CO 2 loading, gas flow rate, and DMBA/DEEA composition ratio on CO 2 absorption rate. This study determined that the flow velocity, reaction temperature, and CO 2 loading affected the CO 2 absorption rates to a certain extent. In addition, comparing the reactive properties of the 4M DMBA + 2M DEEA and 2M DMBA + 4M DEEA absorbents under the same experimental conditions revealed that the 4M DMBA + 2M DEEA absorbent exhibited higher absorption rate and reaction stability. A kinetics model also indicated that the CO 2 absorption of the phase-change absorbents used in this study was mainly affected by the liquid film diffusion process. This study contributes theoretically to the development of CO 2 absorption technologies.
研究领域:
化学工程
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环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2023
·
IF 9
Hongming Fu,Yubin Shen,Zhaohao Li,Heng Zhang,Haiping Chen,Dan Gao
The application of membrane absorption for CO 2 capture has been limited by membrane wetting. In this paper, tubular Al 2 O 3 ceramic membranes (marked as M1 and M2) are hydrophobically modified by sol-gel and dip-coating method and then used for CO 2 capture. The surface morphology , surface composition, wettability and flux are characterized in detail. The mass transfer performance of M1 and M2 is studied at different gas and liquid Reynolds numbers . After modification, the surface contact angle can reach as high as 170.7°. The carbon capture performance of the modified M1 and M2 is significantly improved. Under laminar flow condition , CO 2 mass transfer coefficient increased from the initial 1.03 × 10 −4 m/s to 14.59 × 10 −4 m/s, and the CO 2 capture efficiency increased from the initial 28.55%–98.55%. The mass transfer resistance of ceramic membrane contactor is also analyzed. The resistance of liquid phase plays a leading role in the mass transfer performance in laminar flow state . For non-wetting membrane, membrane thickness has little effect on the mass transfer performance. In addition, it is shown that the superhydrophobic M1 and M2 exhibit excellent corrosion resistance . The research in this paper shows that superhydrophobic ceramic membrane is more suitable for CO 2 capture in industrial production.
研究领域:
化学工程
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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
危险品化学品经营许可证（带存储）