FUEL
·
2024
·
IF 6.7
Wang Xiangyu,Liu Chenwei,Nie Jiacheng,Zhou Chenru,Huang Chenmei,Liu Long,Li Mingzhong
CO 2 foam (CF) flooding is a widely adopted enhanced oil recovery (EOR) technique for later stage water flooding reservoirs. However, inadequate mixing of CO 2 and foaming agents often results in uneven and unstable foam, limiting its efficiency. To address this limitation, a novel CO 2 aerosol foam system (CAFS) generated with a custom-designed aerosol foam generator was developed for systematically evaluating CAFS performance following water flooding, with a focus on gas–liquid ratio, pre-injection volume, and solution concentration through core flooding experiments and visualized microscopic flooding experiments. Core flooding experiments show that CAFS achieved an ultimate recovery factor of 62.43 % and reduced water cut by up to 32.51 %, representing improvements over conventional CF by 10.45 % and 20.57 %, respectively. This improvement is attributed to changing rock wettability of nanofluid addition and the high resistance coefficient of aerosol foam. The visualized microscopic flooding experiments further reveal that CAFS produces more uniform and stable foam, enhancing sweep efficiency through mechanisms such as trapping effects, Jamin effects, and pore-throat occupation. Moreover, the emulsification of SDS solution and dissolution viscosity-reducing of CO 2 further improve oil displacement efficiency. Collectively, these findings demonstrate that CAFS outperforms conventional CF flooding and has broad application potential in oilfield development.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Haitao Shi,Rong Cao,Haijun Zhang,Jiajia Yang,Yanlin Fu,Jiping Chen
Solid amine adsorbents represent a promising class of CO 2 sorbents, but their amine efficiency is limited by the inaccessibility of peripheral amines. The surface of mesocellular silica foam (MCF) is functionalized with the mixture of short-chain 3-Glycidyloxypropyl) triethoxysilane (GPTES) and long-chain Octadecyltrimethoxysilane (OTMS), forming pocket structures on the support surface, thereby exposing more amine sites and enhancing the amine efficiency of polyethylenimine (PEI). The resulting adsorbent demonstrates a high CO 2 adsorption capacity (5.02 mmol g −1 at 50 °C, 10 vol.% CO 2 , and 50%RH), high amine efficiency (0.43 at the dry condition), outstanding cyclic stability (0.5% performance decline per cycle under the conditions of dry CO 2 regeneration), and fast adsorption kinetics (15 min for adsorption saturation at 50 °C). First-principles calculations and CO 2 temperature-programmed desorption (TPD) experiments demonstrate that the introduction of GPTES and OTMS is beneficial to decreasing adsorption energy and forming paired carbamic acid states and ammonium carbamate states.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Junwei Zhang,Kang Wang,Xitao Wang,Xingang Li
N-doped carbon materials have garnered extensive development in electrochemical CO2 reduction due to their abundant sources, high structural plasticity, and excellent catalytic performance. However, the use of powder carbon materials for electrocatalytic reactions limits their current density and mechanical strength, which pose challenges for industrial applications. In this study, we synthesized a monolithic N-doped carbon electrode with high mechanical strength for efficient electrochemical reduction of CO2 to CO through a simple pyrolysis method, using phenolic resin as the precursor and ZIF-8 as the sacrificial template. At 900 °C, the decomposition of ZIF-8 and the volatilization of Zn atoms promote the formation of a hierarchical porous structure in the carbon matrix, characterized by macropores with extended mesoporous channels. Simultaneously, N active species derived from ZIF-8 are effectively generated around the pores and fully exposed. The efficient mass transfer facilitated by the hierarchical porous structure and high activity of exposed nitrogen species enables efficient conversion of CO2 to CO. When the ZIF-8 content is 30%, the catalyst achieves a Faradaic efficiency of 88.9% for CO at a low potential of −0.7 V (vs RHE), with a CO production rate of 244.05 μmol h–1 cm–2. After 50 h of potentiostatic electrolysis, the current density and FECO remain stable. This work not only provides a strategy for the synergistic effects of hierarchical porous structures and nitrogen doping but also offers an effective method to avoid using powder binders and prepare integrated, stable monolithic electrodes.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yingyang Song,Junyu Lang,Qingrui Zeng,Jinping Cheng,Mingce Long
Monoethanolamine (MEA)-based carbon dioxide absorption is one of the effective carbon capture, utilization, and storage (CCUS) technologies but is significantly restricted by the high energy consumption in the regeneration of rich amine solution. Solid acid catalysts have the potential to reduce energy consumption, while the exploration of highly active catalysts with abundant Bro̷nsted and Lewis acid sites remains needing. We developed an efficient solid acid catalyst, niobium-modified HZSM-5 (Nb/HZ), to facilitate CO2 desorption from the CO2-captured MEA solutions. The Nb/HZ catalysts with various niobium loadings were synthesized by using an impregnation method. HZSM-5 retained its pore structure and large surface area after niobium incorporation. The catalyst with 4% Nb (4.0-Nb/HZ) has the highest activity and stability, with 61% increase in the desorption rate, 50% increase in the desorbed CO2 amount, and 37% reduction of relative heat duty. According to theoretic calculations and experimental analyses, the Nb/HZ catalyst provides abundant Bro̷nsted and Lewis acid sites to facilitate carbamate adsorption, proton transfer, and carbamate breakdown, thus reducing the activation energy for CO2 desorption. This work provides a valuable solid acid catalyst for amine-based CO2 capture and also brings insights for the development of a novel solid acid for diverse catalysis.
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Ruohua Qu,Na Liu,Qiong Wen,Jingyi Guo,Fei Ge
Algae-driven photosynthetic CO 2 fixation is a promising strategy to mitigate global climate changes and energy crises. Yet, the presence of metal nanoparticles (NPs), particularly dissolvable NPs, in aquatic ecosystems introduces new complexities due to their tendency to release metal ions that may perturb metabolic processes related to algal CO 2 fixation. This study selected six representative metal NPs (Fe 3 O 4 , ZnO, CuO, NiO, MgO, and Ag) to investigate their impacts on CO 2 fixation by algae ( Chlorella vulgaris ). We discovered an intriguing phenomenon that bivalent metal ions released from the metal NPs, especially from ZnO NPs, substituted Mg 2+ within the porphyrin ring. This interaction led to 81.8% and 76.1% increases in Zinc-chlorophyll and Magnesium-chlorophyll contents within algal cells at 0.01 mM ZnO NPs, respectively. Integrating metabolomics and transcriptomics analyses revealed that ZnO NPs mainly promoted the photosynthesis-antenna protein pathway, porphyrin and chlorophyll metabolism, and carbon fixation pathway, thereby mitigating the adverse effects of Zn 2+ substitution in light harvesting and energy transfer for CO 2 fixation. Ultimately, the genes encoding Rubisco large subunit ( rbcL ) responsible for CO 2 fixation were upregulated to 2.60-fold, resulting in a 76.3% increase in carbon fixation capacity. Similar upregulations of rbcL expression (1.13-fold) and carbon fixation capacity (76.1%) were observed in algal cells even at 0.001 mM ZnO NPs, accompanied by valuable lipid accumulation. This study offers novel insights into the molecular mechanism underlying NPs on CO 2 fixation by algae and potentially introduces strategies for global carbon sequestration.
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高影响因子
FUEL
·
2024
·
IF 6.7
Shaoliang Zhu,Bingtao Zhao,Yaxin Su
High-efficiency and cost-effective adsorbents are crucial to dry capture of carbon dioxide (CO 2 ). The polyethyleneimine (PEI) was co-impregnated with tetraethylenepentamine (TEPA) on γ-alumina (Al 2 O 3 ) to synthesize the adsorbent and enhance the capture process. The influence of amine loading and operating parameters on CO 2 adsorption was investigated, and the process parameters were modeled. The results depict that the optimal loading is 50 % when functionalized either PEI or TEPA individually, which is 3.7 and 4.6 times higher than γ–Al 2 O 3 . The CO 2 capacity of γ–Al 2 O 3 functionalized with multiple amines (30 %PEI+20 %TEPA) is 2.65 mmol/g, due to the synergies of the two amines to increase the chance of CO 2 binding to the sites. Regeneration performance illustrates that the adsorbent remains at 90.2 % of the initial capacity after seven tests. The maximal capacity of 2.70 mmol/g occurs at 70 °C. Modeling results indicate the kinetics can be evaluated by the Avrami model (R 2 > 0.990) with the activation energy of 5.65 kJ/mol. The process is controlled by physical–chemical adsorption, influenced by intraparticle diffusion, as described by the deactivation model. Finally, a comparison and assessment were conducted for their techno-economic performances, and the pathway to applications was also proposed in engineering practice.
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Journal of CO2 Utilization
·
2024
·
IF 7.2
Luqman Abdullahi Sani,Haolong Bai,Zifu Xu,Liangliang Fu,Yining Sun,Xiaorui Huang,He Gao,Xuejing Liu,Dingrong Bai,Zhanguo Zhang,Fabing Su,Jiao Liu,Guangwen Xu
Ni/Al 2 O 3 catalysts (noted as Ni/Al-350, Ni/Al-500, and Ni/Al-700, respectively) were synthesized by a facile solution combustion method but at different combustion temperatures (350 °C, 500 °C, and 700 °C, respectively). For comparison, Ni/Al 2 O 3 (noted as Ni/Al-100) was also prepared by the impregnation method and applied in the methanation reaction. The Ni/Al 2 O 3 synthesized at the combustion temperature of 350 °C showed better performance than the others at higher combustion temperatures, and the activity for CO 2 methanation followed an order of Ni/Al-350 > Ni/Al-500 > Ni/Al-700 > Ni/Al-100. The increase in the combustion temperature decreased active sites for the H 2 and CO 2 adsorption, which could be associated with the reduced Ni dispersion and basic sites, thus lowering its activity and increasing its carbon deposition rate.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Qiong Liu,Chengbo Bai,Die He,Xueting Wu,Yiping Wu,Rong Chen
Surface defects in semiconductors play a significant role in modulating the performance of photocatalytic reactions. However, there is still insufficient exploration regarding the influence of defects on the photocatalytic CO 2 reduction performance. In this study, we achieved controllable construction of oxygen vacancies (OVs) in BiOX (X=Cl, Br) samples through one-step solvothermal treatment in polyols by adjusting the reaction time. The introduction of OVs significantly enhanced the photocatalytic activity of BiOX (X=Cl, Br) for converting CO 2 to CO. Among all the tested BiOX (X=Cl, Br) samples with OVs, BiOCl-OV-2 and BiOBr-OV-2 samples with a moderate amount of OVs exhibited the highest CO yield of 28.51 and 15.22 μmol g cat −1 after 4 hours of irradiation, respectively. Photo-/electrochemical measurements results revealed that engineering OVs into BiOX (X=Cl, Br) effectively adjusted their electronic structure, charge density and separation; however, excessive OVs may slightly degrade their photoelectrochemical properties and thus lead to reduced photocatalytic activity. Furthermore, an appropriate amount of OV was found to enhance both CO 2 adsorption capacity and photo-generated electron reduction ability, thereby further promoting the overall efficiency of photocatalytic CO 2 conversion. Through in situ FTIR spectra analysis, we uncovered the process of photocatalytic conversion from CO 2 to CO.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yihui Li,Ziang Zhao,Min Zhao,Hejun Zhu,Xinzheng Ma,Zheng Li,Wei Lu,Xingkun Chen,Linbin Ying,Ronghe Lin,Yu Meng,Yuan Lyu,Li Yan,Yunjie Ding
Promotional effects of oxygen vacancies of spinel catalysts in CO 2 hydrogenation are reported in early works, but the mechanistic origins remain elusive. Here, CoAl 2 O 4 spinels with varying numbers of oxygen vacancies are deliberately designed by a sol-gel method and different post-treatments. By combining catalytic testing, advanced electron microscopic and spectroscopic characterizations, and computational studies, the unusual oxygen vacancy-dependent catalytic behaviors are rationalized. Our work reveals that i) perfect spinel crystals possessing least oxygen vacancies can effectively constrain the Co 2+ species at working conditions that are less active but selective to CO; and ii) vacancy-rich spinels promote both H 2 and CO 2 activations and COOH* formation, explaining the higher hydrogenation activity, but overwhelming vacancies cause Co 2+ reduction and promote direct CO 2 * dissociation to CO* and deep hydrogenation to CH 4 . These molecular-level understandings reinforce the idea of proper design of oxygen vacancies to achieve activity-selectivity balance.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 4
·1987-1992
·
IF 2.936
Mei Wang,Mingming Wang,Na Rao,Jiale Li,Jianfen Li
Alcohol amine solutions have a high absorption capacity and rate for CO2 capture, however, there are some shortcomings such as high energy-consumption and low stability. To enhance CO2 capture performance of aqueous MEA, a functional ionic liquid ([NH2e-mim][BF4]) was introduced based on the advantages for CO2 capture. Absorbents were prepared with the molar concentration ratio of [NH2e-mim][BF4] to the 30 vol% aqueous MEA of 0 : 10, 1 : 9, 2 : 8, 3 : 7, 4 : 6 and 6 : 4. The density and the viscosity of the investigated absorbents were measured and the effects of the molar fraction of [NH2e-mim][BF4] (nI) and temperature on CO2 absorption performance were investigated. CO2 desorption performance of the solvent at different temperatures was discussed. The stability performance of the absorbent with nI of 2 : 8 (I/M2:8) was examined by five consecutive cyclic tests. The results showed that for pure CO2, the I/M2:8 displayed the highest absorption performance at 303 K under 1 bar: a comparable CO2 absorption capacity of the 30 vol% aqueous MEA and a higher CO2 absorption rate at the later absorption stage. Moreover, with the increase of temperature, CO2 absorption capacity and rate decreased, while CO2 desorption efficiency and rate increased. 393 K was chosen as the optimum desorption temperature with the desorption efficiency of 99.31%. The introducing of IL contributed to CO2 desorption performance of the absorbents significantly. The properties (CO2 absorption capacity, mass loss, density and viscosity) of the I/M2:8 during the cycles suggested that the IL-MEA mixture had an excellent stability performance.
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高影响因子
International Journal of Greenhouse Gas Control
·
2017
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IF 3.741
Yan Zhou,Yiheng Rao,Tielin Wang,Klaus-J. Jens
Piperazine (PZ) based amine blends are promising solvents for post-combustion CO 2 capture, but PZ can form potential carcinogenic nitrosamines from nitrite. In this work, the kinetics of the reaction between nitrite and PZ to form N-nitrosopiperazine (MNPZ) was determined in 0.1–0.5 mol L −1 PZ in the presence of 17–170 mmol L −1 formaldehyde at 60–135 °C. The nitrosation of PZ can be catalyzed by formaldehyde, a primary degradation product of PZ. And the reaction involving nitrite and PZ is first order in nitrite, formaldehyde, and hydronium ion. A kinetic model was established, and the activation energy is 33.6 ± 1.8 kJ mol −1 with a rate constant of 2.3 × 10 3 ± 0.4 × 10 3 L 2 mol −2 s −1 at 100 °C. The kinetics will be helpful to develop strategies to reduce nitrosamine formation and accumulation in PZ based CO 2 capture systems.
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CHEMICAL ENGINEERING & TECHNOLOGY
·
2018
·Vol. 41
·期 6
·1122-1131
·
IF 1.588
Ziyi Zhao,Guijin Liu,Qing Lin,Yanbin Jiang
Paracetamol (PCA) and trimethylglycine (TMG) were co-crystallized and micronized by means of the supercritical anti-solvent (SAS) process to improve the tabletability of PCA. The effects of operating conditions on particle properties were investigated in detail. Characterizations were performed to confirm the co-crystal state of PCA-TMG. The results indicated that the same crystal form with different crystal habits was prepared. The optimal PCA-TMG co-crystals presented a much larger tensile strength, higher drug content of PCA, and smaller particle size than those obtained using the ball milling (BM) process. The SAS-processed PCA-TMG co-crystals showed an enhanced solubility, dissolution rate, and tableting performance compared to that of BM.
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