ACS Applied Energy Materials
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2026
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IF 5.5
Jie Li,Yongxiang Wang,Jingting Sun,Yong Dai,XiaoHua Cao,YongMing Luo,Xiaoping Xing,Kaige Chen
Photothermal CO2 hydrogenation harnesses light and heat synergistically to convert CO2 into value-added chemicals, representing an emerging pathway toward carbon-neutral energy systems. Layered MXene, with its large specific surface area and moderate conductivity, is ideal for enhancing photothermal performance. In this work, Ni nanoparticles (NPs) were loaded onto the MXene-derived TiO2 (MTiO2) surface via a hydrothermal method to synthesize Ni@MTiO2 composites with high photothermal CO2 methanation performance. The solar-light-driven methane (CH4) production of the 30Ni@MTiO2 catalyst was 66.03 mmol gcat–1 h–1, with a selectivity approaching 100%. The superior catalytic performance can be primarily attributed to the high dispersion of Ni NPs, the substantial concentration of oxygen vacancies, enhanced charge-carrier separation efficiency, and the robust adsorption capacity. This study provides a feasible strategy for synthesizing efficient photothermal CO2 methanation catalysts derived from MXene.
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FUEL
·
2024
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IF 6.7
Nanxin Zheng,Jingyi Zhu,Zhaozhong Yang,Yufeng Long,Liehui Zhang,Xiaogang Li,Jin Zhang,Huohai Yang
Hydraulic fracturing is an essential technique for extracting unconventional oils and gases. However, as unconventional oil and gas resources are extensively exploited, the high costs of traditional fracturing fluids have become increasingly apparent. In this study, a high-performance CO 2 -responsive VES-CO 2 foam fracturing fluid was developed by combining CO 2 foam fracturing fluid with viscoelastic surfactant (VES) fracturing fluid, based on responsive surfactants, to establish a recyclable fracturing fluid system stimulated and reduce operational costs. Firstly, a CO 2 -responsive VES-CO 2 foam fracturing fluid was constructed in a scCO 2 environment. Secondly, the stability mechanism of the CO 2 -responsive VES-CO 2 foam system was revealed through analysis of bulk rheological properties and interfacial characteristics. Finally, the performance of the fracturing fluid under high pressures was tested. The study found that under CO 2 stimulation, oleamidopropyl dimethylamine (DOAPA) forms a cationic surfactant, DOAPA-CO 2 , which, with the assistance of sodium benzenesulfonate (NaSbs), generates worm-like micelles . This transformation increases the zero-shear viscosity of the foaming solution from 12 mPa·s to 2869.69 mPa·s. The elastic modulus rises by two orders of magnitude, while the foam drainage half-life extends from 610 s to 3720 s. Encapsulation parameter P (P = 0.38) and TME tests confirmed the formation of worm-like micelles in the DOAPA@NaSbs-CO 2 system. Moreover, interfacial dilational rheology experiments indicated that the presence of worm-like micelles altered the relaxation mode of DOAPA-CO 2 molecules, enhancing the interfacial dilational viscoelasticity of the liquid film, thereby improving foam stability and the sand suspension capability of the liquid film. Performance evaluations showed that as the pressure increased, the proppant settling rate first decreased slowly and then rapidly, mainly because of the phase transition of CO 2 . Within the test range, the proppant settling rate stabilized below 2.4 cm/min, meeting the engineering requirements. By controlling the presence of CO 2 , the fracturing fluid can break its gel, and the foam viscosity can switch between low and high, providing conditions for recycling the fracturing fluid. Additionally, the damage rate of this CO 2 -responsive VES-CO 2 foam fracturing fluid was only 8.08 %, indicating its compatibility with formations and fractures.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 19.7
Xingyang Wu,Yucui Xiang,Miao Tian,Jing Lyu,Kexin Wang,Xiang Li,Haotian Song,Tao Zhang,Jiahao Qiu,Liyong Gan,Zhongkai Hao,Guo Qin Xu,John Hon Kay Yip
Photocatalytic CO 2 reduction in aqueous media represents a crucial route for solar-to-fuel conversion using water as the proton source. However, selectively driving multi-electron CO 2 reduction over the competing hydrogen evolution reaction (HER) remains challenging due to the complex proton-coupled electron transfer (PCET) reactions. Here, a hydrothermal approach is designed with in situ alkalization to anchor robust CuNi dual-atom sites on antioxidative hydroxyl-rich Ti 3 C 2 (OH) x MXene. The resulting Cu 1 Ni 1 /Ti 3 C 2 (OH) x catalyst achieves a high CO yield of 635.8 μmol·g −1 ·h −1 with 99.7 % selectivity and superior cycling stability, outperforming most reported MXene-based and diatomic-site catalysts. In situ spectroscopy and theoretical calculations reveal that Cu sites promote *COOH/*H formation and CO desorption, while Ni sites favor *COOH-to-*CO conversion and enhance water adsorption. This dual-atom synergy precisely regulates PCET at adjacent Cu and Ni sites, enabling HER suppression and enhanced CO generation. This work establishes a new paradigm for engineering stable MXene anchored dual-atom catalysts with site-specific functionalities for highly selective CO 2 photoreduction.
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CHEMICAL ENGINEERING SCIENCE
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2026
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IF 5.1
Qingping Xin,Nana Ren,Shangde Su,Dengdi Wu,Mengke Wang,Xingwei Wang,Jiaxin Wu,Wei Huang,Lantian Dong,Xiaoli Ding,Yuzhong Zhang
An ultrathin mixed-matrix composite membrane (MMCM) for efficient CO 2 separation is developed. A green bottom-up synthesis is employed to fabricate F-Ce two-dimensional nanosheets with a mesoporous structure and well-defined interlayer spacing. These nanosheets are incorporated into a Pebax 1657 polymer matrix to prepare a mixed-matrix coating solution. PDMS/PEI support membranes are fabricated by casting and subsequently modified by UVO 3 treatment to obtain hydrophilic PDMS(UVO 3 )/PEI supports. The Pebax-F-Ce coating solution is uniformly deposited onto the modified support surface to produce Pebax-F-Ce/PDMS(UVO 3 )/PEI composite membranes. The resulting membrane possesses an ultrathin separation layer (∼500 nm) and an intermediate layer (∼150 nm), enhancing gas transport while maintaining structural stability. Uniformly dispersed F-Ce nanosheets form mesoporous architectures that provide rapid CO 2 transport channels, while their −F functional groups enhance CO 2 solubility, further improving gas permeance. The 0.344 nm interlayer spacing provides a moderate size-exclusion effect on larger gas molecules, thereby contributing to improved CO 2 /N 2 selectivity. The high aspect ratio and rigidity of F-Ce nanosheets induce more tortuous diffusion pathways for bulky molecules, further enhancing separation efficiency. Comprehensive characterization (SEM, TEM, FT-IR, XRD, XPS, BET, and gas permeation) confirms excellent performance, showing a CO 2 permeance of 662 GPU and a CO 2 /N 2 selectivity of 59—representing 12% and 44% improvements over conventional Pebax/PDMS/PEI membranes, respectively. This study demonstrates that constructing an ultrathin separation layer and optimizing the composite structure significantly enhances the gas separation performance of MMCMs, providing an effective strategy for efficient CO 2 capture.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2026
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IF 3.9
Haoyi Guo,Pan Cao,Muxian Liu,Guohui Dai,Bei Liu,Changyu Sun,Chun Deng,Guangjin Chen
Hydrogen is regarded as a promising alternative to fossil fuels; however, approximately 95% of the global hydrogen supply still comes from “gray hydrogen”, with high carbon emissions. Efficient separation of CO2 and H2 is a key challenge in gray hydrogen production. This study proposes a novel H2 recovery process based on an aqueous solution of 2-methylimidazole (2-MeIm). The 2-MeIm aqueous solution possesses both strong CO2 absorption capacity and easy desorption performance, which can reduce energy consumption. Pure component solubility experiments were carried out at temperatures ranging from 283.15 to 353.15 K and pressures ranging from 0 to 2.0 MPa, yielding 66 sets of pure CO2 solubility data and 15 sets of pure H2 solubility data, which were used to regress the binary interaction parameters of the NRTL model. Comparison between the fitted NRTL model parameters and the experimental data indicates that the mean relative error of CO2 is 5.19%, whereas that of H2 is only 0.18%. Further, single-equilibrium-stage phase equilibrium experiments were conducted using a mixed gas stream with a CO2/H2 molar ratio of 40:60 to further validate the accuracy of the fitted NRTL parameters. The results demonstrate that the solubility-based fitted model achieves a mean absolute error (MAE) of 0.03 for gaseous CO2 and a mean relative error (MRE) of 0.93% for liquid-phase CO2, indicating high predictive accuracy. Based on Aspen Plus, this study has developed a rigorous process simulation model with a processing capacity of 100,000 N m3/h. The operating conditions were defined through sensitivity analysis, resulting in the following optimized parameters: 7 theoretical stages for the absorber, an operating pressure of 3.8 MPa, a volumetric gas-to-liquid ratio of 200, and a desorption temperature of 373.15 K. Under these conditions, H2 purity and recovery reached 99.99% and 99.13%, with specific energy consumption of only 260.27 kgoe/t H2 (10.88GJ/t H2). Compared with the conventional Rectisol process, the 2-MeIm-based process not only achieves higher H2 purity and recovery rate, but also significantly reduces total energy consumption by 32.07%. This marked performance enhancement underscores the outstanding energy-saving potential of the 2-MeIm system in the field of H2/CO2 separation.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2026
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IF 3.5
Jiahao Wu,Mengxuan Wei,Yikun Zhou,Jiawei Lin,Jing Zhang,Shiyue Kang,Zining Zhou,Jian Tian,Guowu Zhan
This study presents a systematic approach for synthesizing hierarchical bio-NaY zeolite using rice husk-derived silica (bio-SiO 2 ) as structural and compositional templates. The incorporation of bio-SiO 2 significantly increases mesoporous volume and optimizes the distribution of Lewis acid-base pairs within the zeolite framework. Comparative analysis demonstrates a marked improvement in CO 2 adsorption capacity for the bio-NaY zeolite (147.3 mg·g –1 ) over conventional NaY (138.3 mg·g –1 ). ZLC experimental results reveal that this enhancement is attributed to a dual mechanism: (i) the bio-SiO 2 template promotes the formation of a hierarchical pore system, improving mass transport; and (ii) it enhances the accessibility and exposure of active sites, facilitating CO 2 capture and intraparticle diffusion. Molecular dynamics simulations further reveal that the (100) crystallographic plane exhibits superior CO 2 adsorption affinity, kinetics, and selectivity compared to the (001) plane. Additionally, the integration of 3D printing technology enables the fabrication of mechanically robust monoliths (3D-bio-NaY), simplifying adsorbent handling and regeneration. These 3D-printed structures exhibit exceptional cyclic stability, retaining nearly 100% of their initial CO 2 capture capacity over eight consecutive cycles. The findings provide deep insights into the structure-property relationships of hierarchical zeolite and advance the design of efficient adsorbents for industrial CO 2 capture applications.
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APPLIED SURFACE SCIENCE
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2026
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IF 6.6
Shuangqian Liu,Liangshi Wang,Long Wang,Kun Zhang,Liang Xie,Yuxiang Li,Haiyang Zhang,Zongyuan Wang,Guixian Ge
The electrochemical CO 2 reduction reaction (CO 2 RR) to CO faces challenges from slow kinetics and complex pathways, necessitating active, selective, and stable catalysts. This study presents a direct coordination strategy that enables the in situ growth of cobalt tetranitrophthalocyanine (CoTNPc) on Co-embedded N-rich carbon matrix (Co/NC), forming a CoTNPc/NC composite. The directly axial coordination regulates the electronic configuration of Co-N sites, accelerating the *CO formation and desorption. The CoTNPc/NC electrocatalyst achieves a peak CO Faradaic efficiency for (FE CO ) of 96.7% at −0.9 V vs. RHE in H-cell. Furthermore, in the Flow-cell, it maintains FE CO > 90% over a wide potential range (−0.4 V to −0.9 V vs. RHE) and demonstrates durability exceeding 15 h in stability testing. In situ attenuated total reflection infrared (ATR-IR) spectroscopy and Density functional theory (DFT) calculations elucidate that the remarkable performance is driven by the improved electrical conductivity and weakened interaction between the *COOH intermediate and Co sites. This work offers a novel approach to optimizing catalyst-support interactions for electrocatalyst design.
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JOURNAL OF SUPERCRITICAL FLUIDS
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2026
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IF 4
Haixin Sun,Jianlei Qi,Jianzhong Yin
Currently reported Fe-NC catalysts for peroxymonosulfate (PMS) activation are mostly pyrolytically derived nanoparticle systems, which often suffer from low atomic utilization efficiency of the metal species. In this study, a single-atom Fe-NC catalyst was fabricated using a supercritical CO₂ deposition method, with iron(III) acetylacetonate as the metal precursor and a nitrogen-doped carbon material as the support. The as-prepared catalyst was employed to activate PMS for the degradation of Rhodamine B (RhB). Characterization by STEM, XRD, and BET analyses confirmed that the nitrogen-doped carbon support exhibits a high specific surface area and substantial nitrogen content. Aberration-corrected electron microscopy directly evidenced the uniform dispersion of isolated Fe atoms on the support surface. After 5 min of reaction, an RhB removal efficiency of 82.3% was achieved, corresponding to a turnover frequency of 2.73 min⁻¹. These results highlight the effectiveness of atomically dispersed Fe sites in activating PMS to generate reactive oxygen species.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
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IF 9.2
Jianfei Ji,Zili Ma,Shaocheng Zhang,Chao Huang,Kegong Fang
The highly selective conversion of CO 2 -containing syngas to higher oxygenates (C 2+ OH), while achieving CO/CO 2 co-conversion, remains a fundamental challenge. In this work, we developed a series of multifunctional catalysts based on CoMn and ZnFe 2 O 4 with various coupling configurations. By precisely regulating the synergistic coupling of elementary reaction steps, we have successfully achieved the conversion of CO 2 -containing syngas while avoiding the removal of CO 2 . Specifically, the CoMn(up)|ZnFe 2 O 4 (down) catalyst achieved 32.2% and 14.8% of CO and CO 2 conversion, yielding 41.5% oxygenate selectivity with a C 2+ OH/ROH fraction of 91.2%. Furthermore, the catalyst exhibited exceptional stability over a 240 h continuous run. The study reveals that the suitable CO 2 concentration (<12%) promotes the formation of C 2+ oxygenates, whereas high CO 2 concentrations negatively affect the C–C coupling. Catalyst characterization and mechanistic studies demonstrate that a small amount of CO 2 enhances the formation of formate and carbonate intermediates on the catalyst surface. In CO/CO 2 hydrogenation, the multifunctional catalyst provides an additional pathway, in which the C–C coupling proceeds via the reaction between CH x ∗ alkyl species generated on the CoMn component and CH 3 O∗ methoxy intermediates formed on the ZnFe 2 O 4 catalyst surface.
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CHEMICAL ENGINEERING SCIENCE
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2026
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IF 5.1
Zhongshuang Xu,Chiyu Shen,Pengxu Yan,Xiaojing Zhang,Shuai Wang,Zhimao Yang,Chuncai Kong,Qikui Fan
Temperature is a key operating variable that governs both activity and selectivity in the electrochemical CO 2 reduction reaction (CO 2 RR). Here, we systematically elucidate the temperature-dependent behavior of a bismuth-based catalyst supported on carbon nanotubes (Bi-CNT) over a broad window of 303–343 K. The catalyst delivers a maximum Faradaic efficiency of 95% for formate at 318 K, accompanied by a high partial current density for formate of 285.6 mA cm −2 at a total current density of 300 mA cm −2 . By combining in-situ Raman spectroscopy with molecular dynamics simulations, we reveal that the moderate heating enhances formate selectivity through a cooperative increase in local alkalinity and a restructuring of the hydrogen‑bond network of interfacial water, which suppress the hydrogen evolution reaction. At elevated temperatures, the attenuation of local alkalinity and the growth of weakly hydrogen‑bonded water populations promote CO and H 2 formation, leading to diminished formate selectivity. These findings establish temperature‑mediated control of the interfacial microenvironment as an efficient strategy for robust, high‑rate CO 2 ‑to‑formate conversion under industrially relevant, thermally dynamic operating conditions.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2026
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IF 4.5
Si Sun,Yijing Zhang,Ming Wang,Youhua Zhao,Zhehua Jia,Shenzhen Cong
Hydrogen (H 2 ) is a key feedstock for clean energy, and efficient separation of H 2 /CO 2 is an important link. To solve classic ZIF-8 membrane difficulties, such as long preparation times and weak binding force between crystals and supports, this work used an innovative gel-assisted in-situ growing approach. Specifically, a zinc-based gel was placed onto the PSf support and thermally activated, resulting in the creation of an ultra-thin dense membrane with a thickness of about 100 nm. The effects of reaction time and 2-MIM concentration on membrane performance were thoroughly examined. The results showed that the 0.8-ZIF-8-40 membrane had the best separation performance. The resulting 0.8-ZIF-8-40 membrane exhibited an H 2 permeance of 2200 GPU and an H 2 /CO 2 selectivity of 33, surpassing the Robeson upper bound (2008). Furthermore, the membrane maintained good separation performance after 60 h of continuous operation.
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Journal of Materials Chemistry A
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2026
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IF 9.2
Wenlong Yang,Zhenghui Ma,Guoli Fan,Xiaoyan Pu,Feng Li
Photocatalytic CO2 reduction to produce high value-added hydrocarbons has attracted significant attention, yet its overall efficiency remains unsatisfactory. In this work, a micro-liquid film reactor featuring enhanced mixing efficiency was utilized to realize the doping of single Fe atoms into the lattice of TiO2, enabling the generation of abundant atomically dispersed Feδ+ -Ov-Ti structures (Ov: oxygen vacancy). The results showed that compared to pristine TiO2, the optimized Fe-TiO2 photocatalyst bearing a 4 wt.% Fe content exhibited 15.2 times higher activity, with a significant shift in the predominant product from CO to CH4, as well as an impressively high CH4 formation rate of 29.2 μmol•g-1•h-1 , surpassing those over most of the state-of-the-art TiO2-based photocatalysts previously reported. It was revealed that the incorporation of single-atom Fe could reduce the bandgap of TiO2 matrix and surface atomically dispersed Feδ+ -Ov structures could improve the separation efficiency of photogenerated charge carriers and facilitated the adsorption and activation of CO2 and the formation and stabilization of key *CO reaction intermediate, thereby accelerating photocatalytic CO2 reduction to produce CH4. The present work affords a simple and efficient strategy for designing single-atom Fe-regulated TiO2-based photocatalysts for a synergistic enhancement of CO2 photoreduction activity and CH4 selectivity.
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