JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2018
·
IF 3.609
Jun Xiao,Weiyi Yang,Shuang Gao,Caixia Sun,Qi Li
A one-pot, solvent-thermal process was used to create the ultrafine ZnFe 2 O 4 nanoparticles photocatalyst . During the solvent-thermal process, the in situ self-forming NaCl not only served as a “cage” to confine the ion diffusion, but also acted as a microreactor for nanocrystallite growth. An average particle size of ∼10 nm and a high-specific surface area of ∼112.9 m 2 /g were observed for the ultrafine ZnFe 2 O 4 nanoparticles Owing to the synergistic effect of ultrafine particle size, the full utilization of the visible light region and high conduction band (CB) position, ultrafine ZnFe 2 O 4 photocatalyst displayed an efficient photocatalytic CO 2 reduction under visible light illumination. Besides, the ultrafine ZnFe 2 O 4 photocatalyst showed high production selectivity for CH 3 CHO and C 2 H 5 OH generation in aqueous CO 2 /NaHCO 3 solution. This work may provide a new idea for the synthesis of new high-efficiency photocatalysts.
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高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Miaomiao Song,Zhongliang Huang,Bin Chen,Sihan Liu,Shafqat Ullah,Dongren Cai,Guowu Zhan
Catalyst design is one of the most critical factors in selectively converting CO 2 and renewable H 2 to value-added chemicals. In this work, Pt nanoparticles with an average size of 2.9 nm were uniformly loaded on hollow mesoporous nickel phyllosilicate which then underwent various reduction treatments to partial extraction of Ni atoms and formation of Ni-Pt bimetallic catalysts for the selective CO 2 hydrogenation in a fixed bed reactor. Experimental results reveal that Pt nanoparticles supported on SiO 2 are highly selective to CO via reversed water gas shift (RWGS) reaction with 100% CO selectivity, while Pt nanoparticles supported on nickel phyllosilicate show high selectivity for CH 4 , particularly, under high reduction temperature. By simply changing the reduction temperature or reaction pressure, the production selectivity can be facilely tuned, and the maximum CH 4 selectivity achieved in the bimetallic Pt/Ni@phyllosilicate catalyst is 100%. The metallic Ni 0 reduced from nickel phyllosilicate owns a high concentration of Lewis basic sites, which could enhance the adsorption strength of CO 2 but prevent the dissociated adsorption. The diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) in different transient states were applied to study the mechanistic insights into how Ni-Pt dual sites tune the product selectivity. The results suggest that CO* over Pt site is the key species for CO 2 conversion to CO, whereas the produced CO* could be further hydrogenated to CH x O* intermediate over Ni site, leading to the formation of CH 4 . The present work offers a new method to prepare Ni-Pt bimetallic catalysts with excellent CO 2 hydrogenation performance towards CH 4 .
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Processes
·
2025
·Vol. 13
·期 11
·3570
·
IF 2.8
Yu Zhang,Ziyang Zuo,Mingyuan Wang,Weifeng Lyu,Ke Zhang,Jiahao Gao
As a process fluid in oil reservoirs, carbon dioxide plays a dominant role in enhanced oil recovery by increasing volume and decreasing interfacial tension. To study the volume expansion behavior of a CO2–oil system under reservoir conditions, ten hydrocarbon components with carbon numbers ranging from 8 to 26 were selected to represent crude oil. Systems of CO2with normal alkanes, cycloalkanes, and aromatic hydrocarbons were measured using a self-assembled high-pressure visible cell, with a temperature range of 313.15 K to 353.15 K and a pressure up to 25 MPa. Experimental results demonstrate that pressure and temperature significantly influence the relative volumetric expansion behavior. The expansion rate exhibits a positive correlation with pressure, whereas it shows a negative correlation with temperature. Among different molecular configurations, normal alkanes exhibit the most pronounced swelling effect. This study establishes that the volumetric expansion behavior of crude oil under CO2exposure is predominantly governed by n-alkane components with carbon numbers less than 16. In the heavy hydrocarbon (carbon number > 16) and CO2system, the influence of hydrocarbon structure and carbon number on the expansion extent is considerably reduced. This paper delivers critical theoretical foundations for elucidating the microscopic interaction mechanisms in CO2enhanced oil recovery and optimizing injection parameter strategies.
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JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Peng Zhang,Linglong Wang,Jiansong Miao,Tao Gan,Bangyan Zhang,Guanna Li,Chunming Xu,Xiaohui Sun
Dual-atom catalysts (DACs) with unique interactions between neighboring sites are promising candidates in the electrocatalytic CO 2 reduction reaction (CO 2 RR). Yet, the controlled synthesis of pure DACs remains a challenge to date. Herein, we propose a facile cation–anion pair adsorption-pyrolysis approach to fabricate a nitrogen-doped carbon supported Fe DAC. Based on this strategy, Fe 2 pairs can be homogeneously incorporated into the carbon substrate. When this candidate was evaluated in the electrocatalytic CO 2 RR, it exhibited a CO faradaic efficiency ( FE CO ) of ∼97 % at an industrial current density of 200 mA cm −2 in a gas diffusion electrode (GDE)-based flow cell filled with 0.5 M KHCO 3 electrolyte, surpassing most of the reported Fe based SACs. Experiments combined with theory revealed that the Fe 2 pair with enhanced electronic localization lowered the reaction free energy for COOH* formation on Fe, thereby boosting the catalytic performance in CO 2 RR. The structure–property relationship built in this study offers atomic-level insights into the rational design of electrocatalysts for efficient CO 2 RR, and extends the application of DACs for heterogeneous electrocatalysis and beyond.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuqing Wang,Shaojun Jia,Wu Chen,Yi Li,Yao Jiang,Peng Cui
CO 2 phase change absorbents (CPCA) have attracted significant interest as potential candidates for the high-efficiency capture of CO 2 . However, the high viscosity of the rich phase in CPCAs hinders their broader application. Given the exceptional CO 2 capture performance and cyclic stability of piperazine (PZ), this study focuses on developing a PZ-based CPCA system of PZ/ n -BuOH/H 2 O to reduce solution viscosity and regeneration energy consumption. Experimental results reveal that the viscosity of the rich phase in PZ/ n -BuOH/H 2 O is as low as 7.06 mPa·s, while the regeneration energy consumption is 2.64 GJ·t −1 CO 2 , which is 19.8 % lower than in the conventional PZ/H 2 O system. Furthermore, 13 C NMR analysis and density functional theory (DFT) calculations provide insight into the CO 2 capture process and mechanism of PZ/ n -BuOH/H 2 O, indicating that polarity differences are primarily responsible for phase separation. Overall, the CPCA of PZ/ n -BuOH/H 2 O developed in this study evinces considerable potential for industrial CO 2 capture applications.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·39664
·
IF 3.9
Zhu Yaqi,Yang Jian,Zhu Hancheng,Alifu Nuernisha,Duan Yingni,Tuxun Hairegu,Zhang Wenyao,Bai Zechen,Lei Zhen
In this work, near-infrared (NIR) persistent luminescence nanoparticles Co 2+ ions doped Zn 2(1− x ) Co 2 x Ga 3 Ge 0.75 O 8 (ZGGO: x Co 2+ ) were successfully synthesized via hydrothermal synthesis. The average particle size decreased from 65.9 to 52.3 nm with increasing Co 2+ concentration ( x = 0.001–0.05). Co 2+ ions can substitute for Zn 2+ at tetrahedral and antisite octahedral sites in the ZGGO host lattice, with corresponding formation energies (ΔE) values are − 4.60 and − 3.03 eV, respectively. The crystal field intensities for Co 2+ in the tetrahedral and octahedral sites were relatively weak, with values of 0.45 and 1.08, respectively. All samples exhibit strong emission peaked at 685 nm and weak emission peaked at 825 nm. The strong peak was deconvoluted into two distinct peaks at 672 nm and 697 nm, which were attributed to the 4 A 2 ( 4 F) → 4 T 1 ( 4 F) transition of Co 2+ ions occupying octahedral sites, and the 4 T 1 ( 4 P) → 4 A 2 ( 4 F) transition of Co 2+ ions occupying tetrahedral sites, respectively. The NIR persistent luminescence of samples was longer than 2 min and primarily originates from octahedral Co 2+ sites. The relevant defects, specifically Ga o Zn and Zn ’ Ga -Ga o Zn , act as the charge traps. The corresponding ΔE values are − 0.55 eV and 1.84 eV, respectively. These results substantially advance the fundamental understanding of the doping and luminescence mechanisms of Co 2+ in spinel gallate-based persistent luminescence materials.
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120722
·
IF 7.2
Changming Zhang,Wensheng Wu,Lingzhi Huang,Jiangxiu Liang,Xiaochao Zhang,Xiushuai Guan,Jinbo Xue
Photocatalytic reduction of CO 2 to CH 3 OH is a promising strategy for the conversion of high value-added chemicals, and it is particularly important to overcome the serious problem of multiproton electronic coupling process. In this paper, we promoted the adsorption of CO 2 and the selectivity of the reduction products by modulating the presence form and the number of active sites of palladium on hierarchical porous carbon spheres. The Pd x -modified carbon spheres exhibited excellent CO 2 adsorption performance (2.17 mmol g −1 ) and photocatalytic reduction activity (CO yield of 14.35 μmol g −1 , CH 3 OH yield of 0.192 mmol L −1 ) while the loading amount of Pd was 0.05 at%, and the yields of the liquid-phase products can still remain around 97.3 % after ten cycles. The analysis results showed that the introduced Pd mainly consisted of 0-valent and + 2-valent states, and the proportion of + 2-valent Pd had a good correlation with the CH 3 OH yield. It was suggested that the + 2-valent Pd and pyridine nitrogen were the main active species and reaction sites. On one hand, pyridine nitrogen played an important role in improving the adsorption and activation of CO 2 , and promoting the reaction of H + with CO 2 to form COOH*. On the other hand, the introduction of Pd active sites not only significantly enhanced the transfer of electrons and holes, but also improved the generation of key intermediates for the conversion of CH 3 OH. This study will provide a new perspective for the design of highly selective photocatalysts.
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SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Yu Cao,Xueyun Li,Baogou Wu,Zefan Xu,Xiaohu Bing,Qian Ren,Long Wang
Porous polymer foams with engineered surface structures are of great interest for superhydrophobic and self-cleaning applications. However, most existing surface modification techniques rely on complex processing routes and provide limited control over surface porosity and morphology. In this work, we propose a simple and sustainable strategy that integrates interfacial design with supercritical carbon dioxide (scCO 2 ) foaming. Bilayers of poly(lactic acid) (PLA) and PLA/thermoplastic polyurethane (TPU) were constructed, in which dispersed TPU domains acted as heterogeneous nucleation sites, thereby facilitating the formation of porous surfaces. The morphology and wettability of the foams were further tailored through TPU content, hot-pressing temperature, and foaming conditions. Subsequent modification with fluorinated silica nanoparticles imparted robust superhydrophobicity (water contact angle >150°, sliding angle <5°) and durable self-cleaning ability even after repeated contamination. This environmentally friendly method thus provides a scalable route to multifunctional foams and highlights the potential of interfacial design for sustainable polymer materials.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Beibei Zhang,Lihua Zhang,Jin Li,Jiawen Fu,Xiwei Qu
In the present work, a series of PVA and CS blend membranes were studied. These prepared membranes were evaluated by binary mixture gases of CO 2 /N 2 and CO 2 /CH 4 . The optimum ratio of PVA/CS for CO 2 permeance was achieved at 5:5. It recorded a CO 2 permeability of 20.8 GPU (1 GPU = 1 × 10 -6 ·cm 3 (STP)·cm −2 ·s −1 ·cmHg −1 ) with CO 2 /N 2 selectivity of 89.7, as well as CO 2 permeability of 10.2 GPU and CO 2 /CH 4 selectivity of 56.3. Secondly, two kinds of nanoparticle UiO-66 and UiO-66-NH 2 were used to prepare mixed matrix membranes. The effects of nanofiller content and chemical groups on gas permselectivity were investigated. Results show that the addition of nanoparticles can effectively improve the permselectivity of membrane. The mixed matrix membranes addition with UiO-66-NH 2 achieved the optimum CO 2 performance and these were following the order of PVA(5)/CS(5)-UiO-66-NH 2 > PVA(5)/CS(5)-UiO-66 > PVA(5)/CS(5). For all these membranes, the permeance and selectivity present initial increased and then decreased. Mixed matrix membranes addition UiO-66-NH 2 (containing 3.75 wt%) exhibits a CO 2 permeance of 32.77 GPU and CO 2 /N 2 selectivity of 93.47, as well as CO 2 permeance of 25.57 GPU and CO 2 /CH 4 selectivity of 70.1, which was beyond the 2008 Robeson upper bound.
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高影响因子
CATALYSIS LETTERS
·
2017
·Vol. 148
·期 1
·11-22
·
IF 2.799
Wang Dong,Bi Qingyuan,Yin Guoheng,Wang Peng,Huang Fuqiang,Xie Xiaoming,Jiang Mianheng
Abstract Hydrogenation of the greenhouse gas CO 2 to higher alcohols through catalysis holds great promise for resource transformation in low-carbon energy supply system, but the efficient and selective synthesis of value-added ethanol by a robust heterogeneous catalyst under relatively mild conditions remains a major challenge. Based on our previous work on Au/TiO 2 as an active and selective catalyst for ethanol synthesis, we report here that a facile photochemical route can be used for the preparation of anatase TiO 2 supported gold catalyst (Au/a-TiO 2 ) for efficient hydrogenation of CO 2 . Compared with the conventional deposition-precipitation method requiring strong brønsted base and flammable H 2 gas in the complicated and time-consuming process, the photochemical way for the facile preparation of supported gold catalyst shows the advantages of green and energy-saving. Of significant importance is that an impressive space-time-yield of 869.3 mmol g Au
−1 h −1 , high selectivity, and excellent stability can be readily attained at 200 °C and total pressure of 6 MPa. The effects of irradiation time, solvent, and metal loading or Au particle size on ethanol synthesis are systematically investigated. Graphical Abstract
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高影响因子
OPTICS EXPRESS
·
2019
·Vol. 27
·期 3
·1991-2000
·
IF 3.561
Hanyang Li,Bo Sun,Yonggui Yuan,Jun Yang
A carbon dioxide (CO2) gas sensor based on a polyhexamethylene biguanide (PHMB)-coated whispering gallery mode (WGM) microbubble resonator is proposed and verified experimentally in this work. Microbubbles were fabricated using two reverse arc discharges focused on microcapillaries. The inner wall of the microbubble was coated with a layer of PHMB using a filling and sintering process. A significant WGM resonance was observed by coupling with a tapered fiber. The experimental results show that as the concentration of carbon dioxide increases, a blue shift appears in the spectrum. Addition, a high sensitivity (0.46 pm /ppm) and a good linear relationship were obtained in the measurement range of 200-700 ppm with a detection limit of 50 ppm. The sensor features include high sensitivity, simple structure, easy manufacture, and low cost.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 2
·1218-1232
·
IF 11.9
Zi-Yang Zhang,Hao Tian,Han Jiao,Xin Wang,Lei Bian,Yuan Liu,Nithima Khaorapapong,Yusuke Yamauchi,Zhong-Li Wang
The electrochemical CO2 reduction reaction (CO2RR) for high value-added multi-carbon product (C2+) production over copper oxide-based catalysts is an important way to realize the carbon cycle. However, developing effective reaction interfaces and microenvironments to improve the Faraday efficiency (FE) and current density of C2+ remains a major challenge. Herein, we construct Cu0–Cu+–NH2 composite interfaces with the assistance of SiO2. Using Cu2O nanoparticles as a model catalyst, a layer of porous SiO2 is first coated on the surface of the particles, and then, a silane coupling agent containing –NH2 is bonded on the surface of SiO2. The strong interaction between SiO2 and Cu2O at the interface induces the oxidation effect of low valent Cu, and even under the CO2RR, part of Cu+ is reduced to Cu0 and part of Cu+ still maintains positive valence, forming the interface of Cu0–Cu+. SiO2 also acts as a bridge between copper species and –NH2 to create a Cu catalyst–NH2 group interface. With the help of the synergistic effect of the composite interfaces, the optimized Cu2O@SiO2–NH2 catalyst achieves a FE of 81.2% for C2+ products with a current density of 292 mA cm−2 at −1.7 V versus a reversible hydrogen electrode. In situ Raman and attenuate total reflectance-infrared absorption spectroscopy spectra show that the interaction between surface –NH2 and CO2 molecules enhances the adsorption and activation process of CO2 and promotes the formation of CO intermediates (*CO). On the Cu0–Cu+ interface, the C–C coupling process between *CO is accelerated, and the two interfaces synergistically promote the generation of C2+ products. This work provides a new strategy for constructing composite interfaces to improve the CO2RR to C2+ products.
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