SYNTHETIC METALS
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2013
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IF 2.109
Wei Li,Hongwei Wu,Jianmei Chen,Huaiguo Xue,Yong Kong
A novel double-potential technique is applied for the electrodeposition of Pt nanoparticles (PtNPs) with controllable size on poly( m -phenylenediamine) (P m PD). The double-potential technique is comprised of the control of the electrodeposition time of PtNPs, followed by the electromodulation of PtNPs size. Oxidation of methanol on the resulting PtNPs/P m PD was investigated, indicating that PtNPs/P m PD exhibits excellent catalytic activity and satisfactory poisoning-tolerance toward methanol oxidation, which is due to the synergistic effect of PtNPs and P m PD. The results demonstrate that PtNPs/P m PD can be a promising electrode material used in the direct methanol fuel cell (DMFC).
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2012
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IF 4.054
Hongwei Zhang,Haiping Huang,Pei Kang Shen
In this paper, a series of Nafion composite membranes with improved methanol barrier properties were fabricated from chitosan (CS) and silicotungstic acid (SiWA) by Layer-by-layer (LbL) self-assembly technique. The Fourier transform infrared attenuated total reflection (FTIR-ATR) spectra and scanning electron microscope (SEM) were employed to prove the successful deposition of CS/SiWA layers. The effect of the methanol-blocking layer on proton conductivity , methanol permeability and direct methanol fuel cell (DMFC) performance was studied. Both proton conductivity and methanol permeability of Nafion composite membranes decreased with the increase of CS/SiWA bi-layer number. The Nafion composite membrane with a reduced proton conductivity of 22% showed a reduced methanol permeability of 47%. Approximate 18% improvement of the selectivity was achieved as compared with plain Nafion membrane . But it did not result in better DMFC performance than that of plain Nafion membrane.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 77
·63044-63049
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IF 3.84
Hualei Hu,Jinghui Lyu,Jie Cen,Qunfeng Zhang,Qingtao Wang,Wenwen Han,Jiayao Rui,Xiaonian Li
The effect of MgO and Pd modification on the catalytic performance of hierarchical porous ZSM-5 for benzene alkylation with methanol was investigated. The results indicated that the introduction of MgO could reduce the Brönsted acid sites which suppressed the side reaction of methanol to olefins and in turn effectively promoted the alkylation of benzene. However, the single modification of MgO could not completely suppress the formation of ethylbenzene and coke. Doping a small amount of Pd had a positive effect on inhibiting the generation of ethylbenzene and coke, which could be attributed to the hydrogenation of ethylene into ethane on Pd. The dual modified catalyst (MgO and Pd) exhibited high benzene conversion (56%) and xylene selectivity (39.1%), and the lowest ethylbenzene selectivity (0.13%) and coke content (0.4 wt%).
研究领域:
催化化学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Shaoda Huang,Jinyan Wang,Hongyin Hu,Yang Li,Fangping Xu,Fang Duan,Han Zhu,Shuanglong Lu,Mingliang Du
The methanol-poisoning of electrocatalysts at the cathodic part of direct methanol fuel cells (DMFCs) can severely degrade the overall efficiency. Therefore, engineering cathodic catalysts with outstanding oxygen reduction activity, and simultaneously, superior methanol tolerance is greatly desired. Herein, bimetallic palladium-copper (PdCu) nanoplates with the optimized d-band center are designed as promising cathodic catalysts for DMFCs. It shows outstanding oxygen reduction activity with a mass activity (MA) of 0.522 A mg Pd −1 in alkaline electrolyte, overwhelming the benchmarked commercial Pt/C and Pd/C. Meanwhile, it has prominent stability with only 4.0 % loss in MA after continuous 20 K cycles. More importantly, the PdCu nanoplates are almost inert toward methanol oxidation and show excellent anti-methanol capability. The theoretical calculations reveal that the downshift of d-band center in PdCu nanoplates and the electronic interaction between Pd and Cu atoms could effectively lower the methanol adsorption energy, thus leading to enhanced methanol tolerance. This work highlights the important role of tuning the electronic structure and optimized geometry of electrocatalysts to simultaneously boost their oxygen reduction activity, stability, and methanol tolerance for their future application in DMFCs.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2016
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IF 2.74
Dongren Cai,Jinbei Yang,Hairong Da,Ling Li,Hongxing Wang,Ting Qiu
Densities, ρ and viscosities, η of N , N -dimethyl-N-(3-sulfopropyl)cyclohexylammo-nium tosylate ([CyN 1,1 PrSO 3 H][Tos]) with water and methanol were measured, at temperatures from 303.15 K to 328.15 K with 5 K interval and 0.1013 MPa, as a function of [CyN 1,1 PrSO 3 H][Tos] molality (or mass fraction). The isobaric thermal expansion coefficient , molecular volume, standard molar entropy, and lattice energy of the pure IL were obtained based on the density data of pure IL . The apparent molar volume , V φ , infinite dilution apparent molar expansibility, E φ ∞ and energy barrier, E were calculated from the experimental data. The Redlich-Mayer equation was used to evaluate infinite dilution apparent molar volume , V φ ∞ . In addition, viscosities can be described satisfactorily by Vogel-Fulcher-Tammann (VFT) equation. The V φ ∞ values of the IL in water are higher than those in methanol, which suggests that the ion-solvent interactions for [CyN 1,1 PrSO 3 H][Tos] + water binary system are stronger than those for [CyN 1,1 PrSO 3 H][Tos] + methanol. And the energy barrier values decrease with the drop of IL mass fraction in both systems, indicating that the viscosity changes of binary mixtures are more sensitive to the temperature at high composition of the IL.
研究领域:
物理化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF BIOTECHNOLOGY
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2021
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IF 3.307
Bo Gao,Ning Zhao,Jieying Deng,Yang Gu,Shiru Jia,Ying Hou,Xueqin Lv,Long Liu
Methanol is a promising green feedstock for producing fuels and chemicals because it is inexpensive, clean, environmentally friendly, and easily prepared. Thus, many studies have been devoted to engineering non-native methylotrophic platform microorganisms to utilize methanol. This study adopted a series of strategies to develop a synthetic methylotrophic Bacillus subtilis that can use methanol as the carbon source, including the heterologous expression of methanol dehydrogenase (Mdh), enhancement of the expressions of 3-hexulose-6-phosphate synthase (Hps) and 6-phospho-3-hexuloisomerase (Phi), regulation of the expressions of key enzymes at both the translational and transcriptional levels, stabilization of the key enzyme expression through a dual-system for expressing the target genes on both the plasmid and genome, and improvement of the catalytic activity of Mdh with a recycling strategy for NAD + . As a result, the methanol consumption of the synthetic methylotrophic B. subtilis reached 4.09 g/L, with the maximum OD 600 showing a 2.21-fold increase compared with the wild-type B. subtilis , which cannot use methanol. We further deleted the phosphoglucose isomerase (Pgi) and added co-substrates to increase the supply of ribulose-5-phosphate (Ru-5-P), and the specific methanol consumption rate increased by an additional 27.54%. Finally, we successfully constructed two strains that cannot grow in M9 medium with xylose or ribose unless methanol is utilized. The strategies used in this study are generally applicable to other studies on synthetic methylotrophy .
研究领域:
微生物学
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代谢工程
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合成生物学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Wenlu Song,Meng Guo,Junzhu Chen,Ting Qi,Xiuxiu Ren,Dongliang Jin,Jing Zhong
Dimethyl carbonate (DMC), as an environmentally friendly green chemical, has been widely used in industrial, pharmaceutical, and food applications. However, the utilization of methanol (MeOH) in its production process leads to the formation of azeotropic mixtures that are difficult to be separated. Similarly, this problem also presents a critical challenge in toluene (TOL) production process. Pervaporation technology has emerged as an effective solution to this challenge, due to its characteristics of energy-efficient and high-performance. Nevertheless, the development of membrane materials that simultaneously exhibit high flux and excellent selectivity remains a significant challenge. In this study, bis(triethoxysilyl)ethane (BTESE) was employed as a precursor to fabricate organosilica membranes by adjusting the H 2 O/BTESE molar ratio, and their separation performance for MeOH/DMC and MeOH/TOL systems was systematically investigated. The results illustrated that the optimized BTESE membrane exhibits outstanding pervaporation performance, achieving separation factor of 1868/113 and high fluxes of 2.12/1.55 kg m −2 h −1 for MeOH/TOL and MeOH/DMC mixtures, respectively. Further studies reveal that membrane performance is closely correlated with the H 2 O/BTESE ratios, and tuning the molecular sieving properties effectively balances flux and separation factor. Additionally, gas permeation experiments elucidate the mass transfer mechanisms of organic solvent molecules in the membranes, providing theoretical guidance for the design of high-performance organosilica membranes. This study offers an energy-efficient membrane-based solution for methanol separation in MeOH/DMC and MeOH/TOL mixtures.
研究领域:
材料科学
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化学工程
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膜分离技术
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绿色化工
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能源与环境工程
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2020
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IF 4.473
Huijuan Han,Yang Yang,Jiafang Liu,Xiuzhen Zheng,Xulin Wang,Sugang Meng,Sujuan Zhang,Xianliang Fu,Shifu Chen
Photocatalytic nitrogen fixation is considered as a very promising technology to solve the high-energy consumption problem in industrial ammonia synthesis. Because of the mildness of reaction conditions, its development is still limited by the low reaction efficiency and unknown reaction mechanism. Inspired by the mechanism of biological nitrogen fixation in nature, Zn3In2S6 with different sulfur sources is prepared to study the effects of cation defects on the adsorption, activation, and reaction in photocatalytic nitrogen fixation. Because of the electron-rich property of zinc vacancies in Zn3In2S6 nanosheets, it can effectively activate the N≡N triple bond, thereby increasing the rate of kinetic reduction. With the activation of N2 molecules on zinc vacancies, the existing protons obtained from methanol (solvent) will greatly accelerate the electron transfer between interfaces during the nitrogen reduction reaction. Notably, Zn3In2S6 with rich Zn vacancies exhibits higher activity (355.2 mg L–1 gcat–1, 15 times) than Zn3In2S6 with poor vacancies in nitrogen fixation. This work describes the contribution of zinc vacancies to the fixation and activation of nitrogen molecules, which is very important to establish a highly effective system of photocatalytic nitrogen fixation.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
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2022
·Vol. 54
·期 2
·191-200
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IF 2.727
Yuhao Xie,Siwei Yang,Shenghua Zhou,Jiazhen Liu,Shuai Zhao,Shangzhong Jin,Qiang Chen,Pei Liang
Raman spectroscopy is widely used in the identification of substances. Raman spectra contain molecular information from various components and interference from noise and instruments. Therefore, using Raman spectroscopy to identify components is still challenging, especially for substances with high similarity. In this study, a class of highly similar products (methanol and ethanol) and a multicomponent mixture of propanol and water were tested using a portable Raman spectrometer. They are divided into 11 categories according to the volume fraction ratio. A total of 5,060 groups of Raman spectrum data were obtained, constituting the data set of this study. The deep neural network structure adopted in this study is based on ResNet architecture, on which the SE module in the attention mechanism is added, which increases the weight of some spectral features and achieves significant performance improvement. Finally, SE-ResNet achieves a recall of 0.95, a precision rate of 0.95, a Micro-F1 of 0.95, and an accuracy rate of 99.20%.
研究领域:
分析化学
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人工智能
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光谱学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yuying Jiang,Xibin Zhou,Yifeng E,Pengyan Wei,Peng Chen,Li Li,Zhuozhe Li,Thomas F. Krenzel,Kun Qian
The design and synthesis of novel electrode catalysts is an applicable strategy to improve the performance of direct methanol fuel cells (DMFCs). The catalyst is composed of molybdenum disulfide as the shell and nickel silicide-doped sodalite (MoS 2 /NiSi@SOD) as the core. A series of characterization results indicate that NiSi is highly dispersed in the nanosized SOD cage on the surface of the SOD zeolite at the crystal faces of (011), (102), and (201). A thin conductive protective cover is formed by MoS 2 on the surface of the zeolite . By the cyclic voltammetry (CV), the catalyst performs a maximum current density of 46.9 mA cm −2 (1250.1 A g Ni −1 ) with 10 M methanol while no remarkable catalyst poisoning and catalyst deactivation are observed. It is revealed that MoS 2 /NiSi@SOD under high catalysis activity protects the Ni from the drain in the alkaline electrolyte , leading to a broad application prospect as a noble-metals-free DMFC catalyst.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
高影响因子
ACS Synthetic Biology
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2025
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IF 3.9
Di Liu,Long Wang,Linbo Gou,Yao Lu,Yongai Ma,Songsong Yao,Tai-Ping Fan,Huaxiang Deng,Yujie Cai
Terpenoids are valuable chemicals used across industries. Methanol, a nonsugar-based feedstock, offers an eco-friendly approach to terpenoid production. In this study, a hybrid methylotrophic pathway was engineered in Serratia marcescens (S. marcescens) HBQA7, which is tolerant to both methanol and terpenoid compounds. The pathway utilizes bacterial methanol dehydrogenase (Mdh) and yeast dihydroxyacetone synthase (Das) to produce monoterpenes and sesquiterpenes from methanol and xylose. 13C labeling experiments identified the optimal enzyme pair: Mdh from Acinetobacter gerneri and Das from Pichia angusta, achieving 7.63% 13C enrichment of the central metabolic intermediate pyruvate. Deletion of pentose phosphate pathway genes (rpiAB) enhanced methanol utilization, achieving 22.99% 13C enrichment. Optimization of the mevalonate (MVA) biosynthetic pathway enabled the production of 5.12 g/L mevalonate in shake flask culture from methanol and xylose. Further construction of a haloarchaea-type MVA pathway enabled the production of geraniol (574.12 mg/L) and (−)-α-bisabolol (1256.41 mg/L) in shake flask cultures. This study demonstrates the first methanol conversion into valuable terpenoids in S. marcescens.
研究领域:
合成生物学
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代谢工程
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微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
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2020
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IF 7.888
Zhe Han,Chizhou Tang,Jijie Wang,Landong Li,Can Li
Hydrogenation of CO 2 into methanol using the H 2 produced from renewable energy is a promising way for carbon capture and utilization. Therefore, the methanol synthesis catalysts with high methanol selectivity are highly desired. In this work, we found that the methanol selectivity of In 2 O 3 catalyst can be significantly enhanced by introducing a small amount of Pt. Methanol selectivity can be increased from 72.2% (In 2 O 3 ) to 91.1% (0.58 wt.% Pt/In 2 O 3 ) at 220 °C. The introduced Pt atoms are doped into the In 2 O 3 , forming atomically dispersed Pt n+ species, most of which are stable under working conditions. It is proposed that the atomically dispersed Pt n+ species are responsible for the enhanced methanol selectivity, while Pt nanoparticles on In 2 O 3 mainly boost the reverse water-gas shift reaction (CO 2 + H 2 → CO + H 2 O).
研究领域:
催化
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化学工程
·
可再生能源
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）