CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Jun Mou,Xingqi Fan,Fei Liu,Xiaodan Wang,Tianxiang Zhao,Peng Chen,Ziwei Li,Chunliang Yang,Jianxin Cao
The direct conversion of CO 2 hydrogenation to lower olefins via methanol as an intermediate is of great significance, but challenges still remain. Herein, we present a binary Mn 2 O 3 -ZnO oxide, which is responsible for catalytic hydrogenation of CO 2 to methanol. After combination of Mn 2 O 3 -ZnO and SAPO-34 molecular sieve, the catalytic reaction displays a markable increase. CO 2 adsorption by alkaline nature, followed by oxygen vacancy activation and synergistic hydrogenation over the binary Mn 2 O 3 -ZnO oxide are the prerequisites for the tandem reaction. However, the tandem spacing between oxide and molecular sieve plays a crucial role, because the suitable intimacy can induce enhanced methanol formation as intermediate via tandem dynamics effect, causing an apparent limitation for reverse water gas shift reaction at high temperature. The optimum mass ratio of 3:1 for two phases demonstrates that more components of binary oxide are needed to improve the rate of CO 2 hydrogenation to methanol, aiming to balance the two-step tandem reaction. Finally, under conditions of 380 ℃, 3 MPa and 3600 mL/g cat /h, 20%Mn 2 O 3 -ZnO/SAPO-34 tandem catalyst is obtained by physical ball milling after 15 min, with excellent stability, sulfur tolerance and catalytic performance with CO 2 conversion at almost 30%, lower olefins selectivity of 80.2% (propylene/ethylene = 5.6:1), and single-pass yield of 10.7%.
研究领域:
催化化学
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能源化学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yaru Shen,Jiasheng Cai,Xin Huang,Yi Zheng,Yu Shao
Photocatalysis is a green technology which could sustainably convert CO 2 into value-added chemicals by using solar energy. Under xenon light irradiation, Mn 2 O 3 /MgTi 2 O 5 nanocomposites synthesized by two-step hydrothermal method greatly increase photocatalytic activity of CO 2 reduction. The optimal yield 420.53 μmol g −1 h −1 for CH 4 is achieved at a ratio 1:10 (W/W) of Mn 2 O 3 to MgTi 2 O 5 , with selectivity of 98.1 %, i.e., 4 and 33 times larger than those of individual MgTi 2 O 5 and Mn 2 O 3 , respectively. The superior photocatalytic performance is attributed to the formation of S-type heterojunction, valence change of Mn 3+ /Mn 4+ , and the bridging effect of Mg migration, which facilitates the separation and transfer of photogenerated electrons and holes. Mn 2 O 3 /MgTi 2 O 5 constructs an efficient redox photocatalytic system composed of a light trapping component (Mn 2 O 3 ), electron transport channel (Mg penetrating Mn 2 O 3 ), mutually separated reduction center (MgTi 2 O 5 ) and oxidation center (Mn 2 O 3 ). The potential Mn 2 O 3 /MgTi 2 O 5 photocatalyst for CO 2 reduction provides new insights to design novel efficient photocatalyst composites akin to biological photosynthesis.
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
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Linfeng Nie,Shuangde Li,Shaohua Chai,Ning Han,Yunfa Chen
Photothermal catalyst oxidation of VOCs is a hot issue in the air purifier field due to the reducing of secondary energy consumption. Herein, we reported a photothermal catalyst CuMn 2 O 4 /Mn 2 O 3 with heterojunction for catalytic oxidizing toluene with high efficiency through sol–gel method followed different calcination temperature. Under the irradiation of 700 mW/cm 2 Xe lamp simulated sun light, the CuMn 2 O 4 /Mn 2 O 3 catalyst exhibited excellent full spectrum light absorption capacity, photo-thermal conversion ability and toluene conversion performance with a 90% toluene conversion (T = 233 °C, WHSV = 30,000 mL/g·h), together with a good catalytic stability. The excellent performance can be attributed to the synergistic effect of abundant oxygen vacancies, Mn 3+ active sites and heterojunctions between CuMn 2 O 4 and Mn 2 O 3 due to the XPS, H 2 -TPR, UPS characterizations.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
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IF 7.336
Jinlong Wei,Junli Wang,Xuanbing Wang,Wenhao Jiang,Nianxiang Hu,Li Wang,Min Li,Ruidong Xu,Linjing Yang
Designing active and durable cost-effective electrocatalysts for catalyzing the oxygen evolution reaction (OER) under a strongly acidic environment is a highly promising approach for OER-associated sustainable energy supplies. Herein, a Pb-Sn-Ca/α-PbO 2 /β-PbO 2 -Mn 2 O 3 (PSC/PbO 2 -Mn 2 O 3 ) composite electrode is fabricated via a simple two-step process. First, porous Mn 2 O 3 microspheres are synthesized by the solvothermal method . Then, a PSC/PbO 2 -Mn 2 O 3 composite electrode with a special embedded structure is prepared through the introduction of Mn 2 O 3 by composite electrodeposition . The low OER overpotential (621 mV) of the PSC/PbO 2 -Mn 2 O 3 (12 g L −1 ) composite electrode is reduced by 445 mV compared with that of the industrial Pb-(0.76 wt%) Ag electrode at a current density of 50 mA cm −2 . In addition, it shows a service life of up to 91 h at a high operation current density of 1.5 A cm −2 in acidic media (3.06 g L −1 H + ), which indicates its excellent stability. Therefore, this work not only demonstrates a design for a durable and high-efficiency electrocatalyst for acidic water oxidation but also provides strategies for the synthesis of advanced electrocatalytic electrodes.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
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2024
·Vol. 29
·期 16
·3892
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IF 4.2
Bin Yang,Xinyao Ding,Lifeng Feng,Mingyi Zhang
The development of efficient and cost-effective electrocatalysts is crucial for achieving a green hydrogen economy through electrocatalytic water splitting. Herein, we report an excellent catalyst, one-dimensional NiS2/NiS/Mn2O3nanofibers prepared by electrospinning, which exhibits outstanding electrochemical performance in an alkaline solution. We explored effective strategies to construct one-dimensional nanostructures and composite oxides to promote the electrocatalytic performance of transition metal dichalcogenides. At a current density of 20 mA cm−2, it requires an overpotential of 333 mV for OER. Furthermore, NiS2/NiS/Mn2O3nanofibers maintain good durability even after 1000 cycles. The long-term electrochemical stability test of the catalyst NiS2/NiS/Mn2O3was implemented at 20 mA cm−2for 12 h. The potential remained at 99.52%. Therefore, this study demonstrates that NiS2/NiS/Mn2O3can serve as a viable green hydrogen production electrocatalyst.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yi Yu,Fanfan Li,Shengbo Ge,Xingchuan Yang,Mashallah Rezakazemi,Shuangquan Zang,Tejraj M. Aminabhavi,Li Xu
Homogeneous mixed iron-manganese oxide nanoparticles prepared from bimetallic MOFs were examined for their catalytic performance to examine toluene degradation. Introducing Fe into Mn 2 O 3 to obtain Mn 2-x Fe x O showed significantly improved catalytic combustion of toluene compared to single manganese or iron oxide. Among these catalysts, Mn 1.82 Fe 0.18 O 3 exhibited optimal catalytic performance showing the lowest T 10 , T 50 and T 90 in weight hourly space velocity (WHSV) of 60000 mL·(g·h) -1 . In high-water content atmosphere, catalytic activity was excellent even after four cycles and such a good catalytic performance of Mn 1.82 Fe 0.18 O 3 might be due to the high surface area (103 m 2 ·g −1 ) and uniform doping of Fe caused by MOFs roasting. Fe doping enhanced the weak acid sites onto Mn 2 O 3 surface, thus promoting the activation of toluene. The doped Fe elongated M = O bond to enhance the nucleophilicity of the active sites, which increased the intrinsic activity of Mn 2 O 3 catalyst. This study could serve as a reference for active sites modification of metal oxide catalysts.
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
EES Catalysis
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2024
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IF 0
Xiao Yu,Chuang Zhao,Lixia Yang,Jian Zhang,Chunlin Chen
The Pt-Mn2O3/CN catalyst formed through the synthesis via the solvent-thermal method involves a synergistic combination of polymer CN and Pt nanoparticles loaded on Mn2O3 to catalyze the degradation of toluene. The composition incorporates Mn2O3 as the central element for photothermal conversion, CN as a uniformly dispersed matrix for Pt nanoparticles, and Pt as the catalytically active center, demonstrating significant efficacy. Particularly noteworthy is the discernible enhancement in the photothermal catalytic degradation capability of the Pt-Mn2O3/CN composite catalyst, specifically in the context of toluene. When subjected to light intensity of 300 mW cm-2 and a toluene concentration of 400 ppm, Pt-Mn2O3/CN achieves toluene conversion and CO2 mineralization rates of 99% and 80.9%, respectively. This improvement primarily stems from the Pt nanoparticles inducing a substantial presence of oxygen vacancies within the catalyst structure, thereby increasing oxygen adsorption capacity and surface mobility. This, in turn, activates adsorbed oxygen species at the catalyst’s interface. The adept utilization and conversion of solar irradiance for volatile organic compound (VOC) abatement underscore its potential as an environmentally friendly and renewable energy source.
研究领域:
环境科学
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材料化学
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催化化学
✓ 已验证
DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Bin Yang,Xin Chang,Xinyao Ding,Xinzhi Ma,Mingyi Zhang
Nickel-based transition metal phosphides have been widely flourishing as oxygen evolution reaction (OER) electrocatalysts . In this study, a new catalyst Ni 2 P/Mn 2 O 3 nanofibers with the advantages of ultra-high electrochemical active area were successfully synthesized. We explored effective strategies that are constructing one-dimensional nanostructures and composite oxides to promote the electrocatalytic performance of transition metal phosphides. The Ni 2 P/Mn 2 O 3 nanofibers only require a low overpotential of 280 mV to deliver a current density of 10 mA cm −2 in 1 M KOH for oxygen production. As a result, it is worthily mentioned that the activity of Ni 2 P/Mn 2 O 3 nanofibers is virtually unchanged after 2000 cycles of voltammetry measurements with a stable nanostructure. This research provides a feasible solution for the design and realization of nanostructured electrocatalysts for the enhancing performance of the OER process.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Yulong Yang,Wanyi Fu,Xixi Chen,Li Chen,Congyu Hou,Tianhao Tang,Xihui Zhang
Catalytic ceramic nanofiber membranes (Mn@CNMs) were prepared by anchoring Mn 2 O 3 nanoparticles on the pits of attapulgite (APT) nanofibers via an impregnation and in-situ precipitation method. An integrated catalytic ozonation/membrane filtration process applying Mn@CNM was employed to degrade sulfamethoxazole (SMX) and the removal achieved up to 81.3% during a 7-h continuous filtration. The reactive oxygen species (ROS) quenching and radical detection experiments were conducted to determine the contribution of 1 O 2 , ·OH and O 2 ·- towards the catalytic degradation of SMX. Moreover, Mn@CNM exhibited wide applicability for real water matrix and the total removal of various kinds of emerging contaminants in real hospital wastewater reached up to 98.5%. The excellent performances of Mn@CNM were attributed to the nano-confinement effect in the membrane layer. First, anchoring Mn 2 O 3 nanoparticles on the pits of the APT surface suppressed the growth and aggregation of nanosized Mn 2 O 3 , providing abundant reactive sites for catalytic ozonation . Second, the interlaced APT nanofibers formed nano-sized network structures, where ROS and SMX were confined in close vicinity and ROS have more chances to attack SMX. This work provides a promising strategy for the preparation of catalytic ceramic membrane with high catalytic efficiency for degradation of emerging contaminants in water.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Tiandong Chen,Luxiang Ma,Chunxi Hai,Yan Zhao,Hongli Su,Junyi Zhang,Shengde Dong,Yanxia Sun,Qi Xu,Xin He,Jitao Chen,Yuan Zhou
Lithium-rich manganese-based cathodes (LR) hold promise for high-performance energy storage systems due to their high specific capacity and energy density. However, challenges such as particle fragmentation and structural degradation during cycling have limited their practical application. In this study, we present a novel gradient modification approach employing Mn 2 O 3 on LR materials to mitigate these challenges. Through advanced characterization techniques including Focused Ion Beam Transmission Electron Microscopy (FIB-TEM), and X-ray Photoelectron Spectroscopy (XPS), we confirm the successful implementation of the gradient coating, with modification depths ranging from 1 to 1.5 μm. Our results demonstrate that this gradient modification effectively alleviates stress between particles, enhances Li + conductivity, and improves cycling stability. The coated LR materials exhibit enhanced electrochemical performance and prolonged cycle life, making them promising candidates for advanced energy storage applications. This work underscores the significance of surface modification strategies in enhancing the performance and stability of lithium-rich manganese-based cathodes for next-generation energy storage systems.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
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IF 4.9
Xinping Wu,Mengting Liu,Hongyao Zhao,Danhong Shang,Yanyun Wang,Feng Zeng,Jialing Shen,Jianming Pan,Xiang Liu,Yiyan Song,Fu Yang
Widespread industrial application of bisphenol A (BPA) has produced large amounts of contaminated wastewater, and its accumulation in the environment has threatened human health. In this study, MnOOH nanorods were deposited with the polydopamine layer containing incorporated Co precursor, which was derived to obtain carbon shell confined Co 3 O 4 onto Mn 2 O 3 nanorods. The controlled calcination temperature was optimized to improve the active state of metal species. Carbon shells mediate the electronic interactions between Co 3 O 4 and Mn 2 O 3 , triggering more Co(II/III) redox cycles and an enhanced fraction of Mn(III) along with more oxygen vacancies in Mn 2 O 3 . In addition, more pyridinic N species were generated in the carbon shell of Mn@C/Co-600, affording better affinity to the polar contaminants and peroxymonosulfate (PMS). Therefore, these characters in Mn@C/Co-600 caused the accelerated reaction cycles in the PMS activation and BPA degradation. Compared with other catalysts, Mn@C/Co-600 showed the highest degradation efficiency of bisphenol A (BPA) with the rate constant of 0.827 min −1 , which was up to 30 times higher than that of Mn@C/Co-Cl-600 (0.027 min −1 ). The anions interference effect on BPA degradation follows the order of Cl − (0.925 min −1 )
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Juan Wang,Aoxiong He,Hao Li,Yi Yang,Zhengguang Wen,Yutong Wang,Zixue Shao,Yuan Chen,Jan-Michael Albina
The development of high-performance lithium-ion battery (LIB) anode materials is essential for addressing growing energy demands. Traditional graphite anodes, limited by a theoretical capacity of 372 mAh/g. In this study, we synthesized core-shell TiO 2 @Mn 2 O 3 microspheres by coating Mn 2 O 3 onto anatase TiO 2 microspheres. The TiO 2 @Mn 2 O 3 anode exhibited an increased specific capacity of 486 mAh/g after 100 cycles and retained 204.8 mAh/g even after 500 cycles at a current density of 2 C. Furthermore, first-principles calculations revealed that the TiO 2 @Mn 2 O 3 heterostructure narrowed the band gap, improved electronic conductivity, and enhanced lithium-ion storage and transport properties. The synergistic effects between TiO 2 and Mn 2 O 3 contributed to superior cycling stability, higher capacity retention, and enhanced rate capabilities. Our work establishes a promising strategy for developing high-capacity, durable anode materials to advance the performance of next-generation LIBs, catering to the ever-growing demand for efficient energy storage solutions.
研究领域:
材料科学
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能源技术
✓ 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）