CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yeshuang Wang,Zhelin Su,Mingxian Duan,Huiling Fan,Ju Shangguan,Chao Yang
Metal oxides-based adsorbents used for desulfurization encounter significant challenges during practical application owing to their inferior reusability and the nature of solid waste of their desulfurization products. This situation might be alleviated to some extent through a rational design of Ni–Mo composite, enabling them firstly to be used as adsorbents for H 2 S removal, and then being utilized as catalysts after desulfurization for C 4 H 4 S hydrogenation. The Ni–Mo composites before and after desulfurization were characterized using XRD, FT-IR, SEM, N 2 adsorption–desorption, XPS, CO 2 -TPD and H 2 -TPR techniques. The experimental findings suggested that Ni and Mo species function as primary active sites for H 2 S adsorption and C 4 H 4 S hydrogenation reactions, respectively. The Ni and Mo composite greatly facilitated the coupling of these two reactions due to the formation of NiMoO 4 phase. This novel active phase not only boosted the interaction between metal and H 2 S but also promoted the formation of weak and moderate alkaline sites, thereby significantly enhancing desulfurization performance. Importantly, this active phase fostered the sulfurization of Mo species and transforming into a Ni–Mo–S component, further favoring the subsequent catalytic reaction in C 4 H 4 S hydrogenation. Consequently, the prepared Ni–Mo composite oxides exhibited excellent properties in H 2 S adsorption and C 4 H 4 S hydrogenation activity, surpassing the capabilities of single metal adsorbents and commercial hydrogenation catalysts.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Lihua Liu,Zhengchi Yang,Lu Zhao,Gang Su,Zuoxiao Wei,Anping Tang,Jianrong Xue
A novel poly(N 1 ,N 1 ,N 6 ,N 6 -tetraallylhexane-1,6-diammonium dichloride) (PTAHDADC) microparticle was prepared via inverse emulsion polymerization . The adsorption characteristics and mechanism for Mo(VI) in an aqueous solution were investigated systemically. Results showed that PTAHDADC had a high positively charge density with a positive charge at every six CH 2 (or CH ) units and presented a coral-like morphology, with macropores distributed in 30–130 μm, and a porosity of up to 46.52%. The Mo(VI) removal efficiency was >99% at pH = 3.0–4.0. The adsorption data could be effectively described using the Langmuir and pseudo-second-order kinetic models . The maximum adsorption capacity was up to 394.11 mg·g −1 at 293 K. The adsorption process was rapid, and reached equilibrium within 120 min with an adsorption activation energy E a of 41.15 kJ·mol −1 . The adsorption process of Mo(VI) by PTAHDADC was accompanied by the partial ion exchange of counterion Cl − , the partial deprotonation of functional groups ( CH 2 ) 3 N + H on PTAHDADC, and the new interaction and bond formation between Mo(VI) and PTAHDADC. Mo(VI) removal by PTAHDADC was a process of spontaneously endothermic entropy increment, which involves physisorption , electrostatic attraction, ion exchange, and chemisorption . PTAHDADC offers a simple synthesis and excellent adsorption performance and recyclability. Therefore, PTAHDADC is a highly potential adsorbent for removing Mo(VI) ions from wastewater and has a broad application prospect.
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
JOURNAL OF MATERIALS SCIENCE
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2025
·Vol. 60
·期 6
·3014-3025
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IF 3.9
Cheng Li-Qian,Pan Jingye,Chen Kai,Hao Xuxia,Xie Xinyuan,Dong Xinrui,Wang Zixuan,Liu Ruiping,Feng Ming
TiNb 2 O 7 (TNO) is a promising anode for lithium-ion batteries owing to its high theoretical capacity, minimal volume expansion, and effective suppression of lithium dendrite formation. Nonetheless, the low electrical conductivity of TNO presents a barrier to practical application. Thus, a Mo 6+ doping strategy was utilized to address the conductivity issue, and TNO- x Mo ( x = 0, 0.05, 0.10, 0.15, 0.20) anodes were prepared by a solid-state method. The incorporation of Mo 6+ ions result in a charge redistribution, which can elevate electronic conductivity and accelerate ion diffusion. What’s more, by precisely controlling the Mo 6+ ion concentration can regulate the morphologies of the TNO, enabling it to expose more fast-ion conducting (020) facets. The synergistic effect of the above two factors significantly enhances the conductivity and electrochemical properties of the TNO anode. As a result, the optimal TNO-0.05Mo with 2D lamellar structure exhibits a high discharge capacity of 347.6 mAh g −1 at 0.1C, superior rate performance, and an excellent cycle lifespan, with retention of 78% after 1500 cycles at 1.5C/1.5C. Meanwhile, the solid-state battery with TNO-0.05Mo as anode also displays improved rate and cycle performance than the liquid-state battery, indicating the great application potential for the next-generation energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2020
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IF 14.588
Feng Ma,Yangyang Wan,Xiaoming Wang,Xinchao Wang,Jiashun Liang,Zhengpei Miao,Tanyuan Wang,Cheng Ma,Gang Lu,Jiantao Han,Yunhui Huang,Qing Li
The sluggish kinetics of lithium polysulfides (LiPS) transformation is recognized as the main obstacle against the practical applications of the lithium–sulfur (Li–S) battery. Inspired by molybdoenzymes in biological catalysis with stable Mo–S bonds, porous Mo–N–C nanosheets with atomically dispersed Mo–N2/C sites are developed as a S cathode to boost the LiPS adsorption and conversion for Li–S batteries. Thanks to its high intrinsic activity and the Mo–N2/C coordination structure, the rate capability and cycling stability of S/Mo–N–C are greatly improved compared with S/N–C due to the accelerated kinetics and suppressed shuttle effect. The S/Mo–N–C delivers a high reversible capacity of 743.9 mAh g–1 at 5 C rate and an extremely low capacity decay rate of 0.018% per cycle after 550 cycles at 2 C rate, outperforming most of the reported cathode materials. Density functional theory calculations suggest that the Mo–N2/C sites can bifunctionally lower the activation energy for Li2S4 to Li2S conversion and the decomposition barrier of Li2S, accounting for its inherently high activity toward LiPS transformation.
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
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Dan Wang,Hanlin Wang,Juanjuan Fan,Hancheng Zhu,Akira Fujishima,Xintong Zhang
Photoelectrochemical (PEC) performance of photoanode is limited by the cascade-dynamic processes, mainly including light absorption , charge separation, and surface reaction. This work adopted a strategy of nanocones modification on FTO substrate (FTO-NC) to enhance light utilization and photoelectrons collection for improved PEC water splitting . Comparative studies showed that FTO-NC enhanced the light scattering, promoting the conversion process of photon to electron/hole and enlarging the effective surface area of BiVO 4 for surface reaction. Meanwhile, cooperative Mo-doping and Co-MOF decoration improved the bulk electron transportation in BiVO 4 , hole migration towards the electrode surface , and accelerated the water oxidation reaction of photogenerated holes. The photocurrent density of FTO-NC/BiVO 4 -Mo/MOFs reached 3.56 mA cm −2 , 6.14 times that of pristine BiVO 4 . The IPCE of FTO-NC/BiVO 4 -Mo/MOFs photoanode achieve 60% at 1.23 V vs. RHE, demonstrating a significantly enhanced light utilization performance. This work presents new insight into boosting cascade-dynamic processes through collaborative strategies for highly efficient PEC water-splitting.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 18
·4642-4650
·
IF 7.779
Pingping Chen,Xiaohui Wang,Rui Yu,Yu Gu,Yuchao Lyu,Yupeng Tian,Jianye Fu,Xinmei Liu
Mo dispersion is the key factor promoting the performance of an Mo/ZSM-5 catalyst for the methane dehydroaromatization (MDA) reaction. Citric acid (CA) was introduced during the conventional wetness impregnation step to ameliorate the Mo dispersion over the Mo/ZSM-5 catalyst. After introducing CA, all catalysts bear high crystallinity relative to that of ZSM-5 zeolite, which proves that CA treatment does not damage the physical structure of catalysts. CA introduction also enhances the Mo dispersion significantly. The metal particle size of 3Mo/ZSM-5-CA1.5 (sample with an Mo loading of 3 wt% and nCA : nMo ratio of 1.5) is within 5–15 nm and is lower than that of pristine 3Mo/ZSM-5 (within 10–20 nm). The role of CA in improving Mo dispersion can be further certified by the higher band gap energy of molybdenum atoms, the higher proportion of surface oxygen in molybdenum oxide and the fewer Brønsted acid sites for the catalysts prepared with the aid of CA. High Mo dispersion contributes to the high activity and selectivity of the catalysts. The aromatic yield of 3Mo/ZSM-5-CA1.5 is almost twice that of pristine 3Mo/ZSM-5. The improvement of Mo dispersion is attributed to the chelation between CA and Mo species, leading to the subsequent isolation of the active components during calcination. Moreover, this effect is more distinct for the catalysts with higher Mo loading. When Mo loading increases to 9 wt%, the aromatic selectivity of 9Mo/ZSM-5-CA1.5 is more than 93% and the coke resistance is obviously elevated compared to that of a catalyst prepared without CA. Based on the above findings, it is clear that adding CA during the Mo/ZSM-5 preparation is an effective way to improve Mo dispersion.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Y. Qu,L. Sun,F. Xie,J. Hu,H. Tan,J. Qian,X. Shi,Y. Zhang
A major challenge faced by NiS as positive electrode material for supercapacitors is the capacity attenuation caused by structural changes in the charging and discharging process. In this article, based on theoretical calculations and experimental studies, it is demonstrated that Mo doping can significantly improve the stability and specific capacitance of NiS for supercapacitor application. Experiments show that compared with original NiS/C, the cycle stability of the doped Mo-NiS/C increases by about 30% after 5,000 cycles, and the specific capacitance achieves 1,852 F/g at 1 A/g. Besides, Mo doping can bring better ion contact and increased reaction site to the original lamellar structure of NiS. The calculation results also show that the bond energy of the doped Mo-NiS/C is lower than that of the original NiS/C, which hinders the structural transformation or other side reactions and achieves a better cycle life. This article verifies the effect of Mo doping on the properties of NiS/C and provides a feasible scheme for the study of metal-doped sulfide.
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
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 27
·期 3
·679-694
·
IF 2.747
Tai Xiaoming,Liu Cansen,Chen Wanlin,Mai Yongjin,Zhang Liuyan,Wu Xinghua,Jie Xiaohua
Rubber tires, as an important part of automobiles, are produced by molding operation under molten temperature and high pressure. However, mold fouling during the vulcanization process is a rock-ribbed problem that not only leads to the loss in productivity and degradation of product quality but also results in severe accidents and enormous economic losses. In this work, a promising Co-Mo/CeO 2 composite coating was electroplated and investigated to solve the mold fouling problem. The effect of CeO 2 content on the surface morphology, microstructure, hardness, tribological and electrochemical behavior is systematically studied. With an addition of 10 g/L CeO 2 , the Co-Mo/CeO 2 composite coating not only possesses the highest microhardness, the best wear and corrosion resistance but also features hydrophobicity and remarkable mold antifouling performance. This study offers a new strategy for producing composite coatings with excellent performance to reduce mold fouling in practical tire industry applications. Graphical Abstract
Co-Mo/CeO 2 composite coatings with excellent corrosion and wear resistance as well as low surface energy were simply electrodeposited and applicated for antifouling in tire mold for the first time.
研究领域:
材料科学
·
表面工程
·
橡胶工业
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Honghong Liu,Hong Gong,Mingming Zou,Heng Jiang,Rasaki Sefiu Abolaji,Ayesha Khan Tareen,Branislav Viliam Hakala,Minghui Yang
Mo-N-co-doped mesoporous TiO 2 microspheres were synthesized via a solvothermal method, followed by nitriding treatment under ammonia gas flow. The efficiency of the samples was investigated by monitoring the degradation of Rhodamine-B under visible light irradiation. The experimental results revealed that Mo-N-co-doped mesoporous TiO 2 microspheres showed better performances than Mo-TiO 2 microspheres. It was observed that; 0.1% molar quantity of Mo doped on TiO 2 at 500 °C for 2 h under nitriding conditions gave highest photocatalytic activities. The nitridation under ammonia gas of Mo-TiO 2 samples created oxygen vacant sites and led to incorporation of substitutional and interstitial Nitrogen. The enhanced visible light photocatalytic activities of Mo-N-co-doped TiO 2 photocatalyst was attributed to the large surface areas, narrow band gap and intense light absorbance in visible region. This study may create a promising and eco-friendly method towards synthesis of metal and non-metals co-doped on semiconductor materials to improve their photocatalytic activities and applications.
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
·
2022
·
IF 7.392
Xiang Li,Huimin Yang,Qirui Wu,Chaoqi Zhu,Jiahong Tang,Chaofan Ma,Lu Tang,Huiyu Su,Xiaoxia Wang,Changsheng Xie,Dawen Zeng
Limited by the dense arrangement of oxygen atoms in the outer layer, the active Mo sites of MoO 3 ultrathin nanoflowers are shielded by oxygen, making it difficult for efficient gas adsorption. Here, oxygen atoms on the surface of MoO 3 nanoflowers (MoO 3 NFs) were knocked out based on a simple hydrogenation strategy to obtain MoO 3 defective nanoflowers (MoO 3 DNFs) with abundant molecular traps and exposed Mo sites. Notably, the response of MoO 3 DNFs-10 to 2 ppm H 2 S is 3 times that of MoO 3 NFs. Oxygen atom knockout was verified based on Laser Raman Spectroscopy, Photoluminescence (PL), UV–Visible Spectroscopy (UV–Vis), and X-ray photoelectron energy Spectroscopy (XPS), while calculations based on density functional theory (DFT) were used to reveal the sensing enhancement of molecular traps and exposed Mo sites. On the one hand, molecular traps can effectively trap H 2 S molecules to facilitate further adsorption. On the other hand, exposed Mo sites have higher charge activity and exhibit higher adsorption capacity for H 2 S gas. This work breaks through the limitations of the traditional oxygen vacancy model and innovatively discusses the synergistic effect of molecular traps and exposed Mo sites on enhanced sensing, which can provide a reference for the gas sensing by metal oxide semiconductors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Qizhou Dai,Jiazhong Zhou,Xiaoyang Meng,Daolun Feng,Chengqiang Wu,Jianmeng Chen
A novel molybdenum modified PbO 2 electrode was successfully prepared with the method of electrodeposition . The SEM and XRD were employed to study the surface morphology of electrodes, which indicated that the modified PbO 2 electrode had a larger effective area and more compact film. Electrochemical degradation of cinnamic acid (CA) in aqueous solution with Mo–PbO 2 electrode and PbO 2 electrode were investigated. The results showed that the Mo–PbO 2 electrode had a better effect of CA removal. The operational parameters influencing the electrochemical degradation of CA with Mo–PbO 2 electrode were optimized and the results revealed that the electrochemical degradation of CA followed the pseudo-first-order kinetics and the optimal removal of CA and COD were 85.51% and 25.79% after 120 min on condition of the electrolyte concentration, initial concentration of CA, current density and initial value of pH were 0.1 mol/L, 300 mg/L, 10 mA/cm 2 and 3.4, respectively. The degradation mechanism of CA in electrochemical oxidation with Mo–PbO 2 electrode was analyzed and the main degradation pathway of CA was proposed based on the intermediates identified by IC and GC–MS.
研究领域:
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Yanlong Jia,Mengyan Wang,Bolun Li,Jiang Liu,Xueping Song,Min Wu,Yongjun Yin
To solve the long-term environmental pollution caused by black liquor and waste plastics, and achieve high-value utilization, the method about co-pyrolysis of black liquid solid and waste plastics (Polypropylene, Polyethylene) catalyzed by Mo-Ni/HZSM-5 to prepare high-quality bio-oil is studied. The results found that hydrocarbons increased from 14.92% to 42.03% as Polyethylene was co-pyrolyzed with BLS, and hydrocarbons increased from 14.92% to 41.75% as Polypropylene was co-pyrolyzed with BLS, adding plastics can significantly improve the hydrocarbons yield of black liquor. Mo-Ni/HZSM-5 acts as a hydro deoxidizer in the pyrolysis of black liquid and waste plastics, the total hydrocarbons of black liquid solid, black liquid solid& Polypropylene, black liquid solid & Polyethylene increased by 6%, 78%, and 45%, respectively. An appropriate increase of pyrolysis temperature can promote the co-pyrolysis of BLS with PP, and BLS with PE, and can increase the yield of hydrocarbons. Compared with black liquor’s pyrolysis, the yield of hydrocarbons can be increased by 59.65% and 24.52% as Polyethylene or Polypropylene is adapted to pyrolysis with black liquid solid, respectively, the high-quality bio-oil is obtained because of a large number of hydrocarbons and high hydrogen content.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）