ACS Catalysis
·
2025
·
IF 13.1
Chuang Gao,Didi Li,Huihua Pan,Hansheng Wang,Yifeng Zhu,Yiying Tang,Minghui Zhu,Zixu Yang,Jing Xu
Controlling product selectivity in platinum-based catalysts during hydrocarbon reforming is a critical challenge, with the main difficulty being the suppression of side reactions like hydrogenolysis. In this work, we report a facile and scalable in situ strategy that significantly enhances the yield of aromatics by activating Pt/Al2O3 catalyst in a propane atmosphere. We demonstrate that this method results in selective deposition of a functional carbon overlayer onto excessively active metal–support interface sites, thereby suppressing the hydrogenolysis pathway, the primary source of low-carbon byproducts. As a result, the selectivity for aromatics nearly doubled, increasing from 17% for the conventionally hydrogen-reduced catalyst to 32%. This work not only transforms carbon deposition from a deactivation factor into a tool for precisely tuning active sites but also provides a powerful strategy for developing highly efficient reforming catalysts.
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 71
·57482-57489
·
IF 3.84
Qianchun Zhang,Feifei Meng,Lin Zha,Xingyi Wang,Guoyi Zhang
In this paper, we developed a cataluminescence-based sensor using SrCO3/graphene for sensitive and selective detection of n-propanol. The composite was characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and gas adsorption. The sensor was coupled with a miniature vaporizing device to detect n-propanol in liquid samples. The experimental results revealed that the SrCO3/graphene sensor exhibited a sensitivity for n-propanol 5.8 times higher than that of pure SrCO3, indicating that the sensitivity of the SrCO3/graphene sensor was increased by adding graphene to SrCO3. The linear range of the sensor was 0.2 to 32 mg L−1 (r = 0.9987) with a limit of detection of 0.08 mg L−1. The sensor showed a rapid response of 2 s and a recovery time of 20 s, respectively. The sensor was used to analyze samples spiked with known concentrations of n-propanol. The concentrations of n-propanol in all samples were well quantified with satisfactory recoveries, indicating that the SrCO3/graphene sensor is a promising candidate for fast, sensitive, selective detection of n-propanol. We also discuss the possible mechanism based on the reaction products.
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DOI
高影响因子
STAR Protocols
·
2022
·
IF 0
Cong Niu,Jianjing Yang,Kelu Yan,Jiafang Xie,Wei Jiang,Bingwen Li,Jiangwei Wen
Here, we present a protocol to decyanopyridate inert N-heterocycles access to N-fused heterocycles via the mechanism of dual proton-coupled electron transfer (PCET). We describe a detailed guide to performing an electrochemical gram-scale protocol for decyanopyridation of inert N-heterocycles. The desired pyridylated quinolone is synthesized in a 5.0 mmol scale with a yield of 76%. The protocol is limited to cyanopyridines. For complete details on the use and execution of this protocol, please refer to Niu et al. (2022) .
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DOI
PubMed
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Yan Yang Yang,Hao Wang,Guo Lin Song,Guo Yi Tang
Phase change method is one of the efficient approach in resolving energy problem for solar energy storage. However, phase change materials seriously affect the heat storage system with low heat releasing and absorbing rate for poor thermal conductivity performance, which result in an inefficient thermal energy storage technology and uncertain economic perspective. In this paper, we prepared dual-functional phase change nanocapsules based on n-octadecane core and polypyrrole shell. Polypyrrole was employed to enhance the electric conductivity and thermal conductivity. The nanocapsules was characterized using Fourier transformed infrared spectrophotometer (FTIR), field emission scanning electron microscope (FESEM), differential scanning calorimeter (DSC), thermal gravimetric analyzer (TGA) and infrared thermal imaging. The results shows a good thermal behavior and high latent heat of 81.99J/g. The dual-fuctional phase change nanocapsules can be expected with a prospect of future profits in energy storage technology.
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DOI
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 33
·期 4
·477-484
·
IF 1.067
Qi Ling-li,Zhong Chun-yan,Deng Zan-hong,Dai Tian-tian,Chang Jun-qing,Wang Shi-mao,Fang Xiao-dong,Meng Gang
In this work, p-type Co 3 O 4 decorated n-type ZnO (Co 3 O 4 /ZnO) nanocomposite was designed with the assistance of bacterial cellulose template. Phase composition, morphology and element distribution were investigated by XRD, SEM, HRTEM, EDS mapping and XPS. Volatile organic compounds (VOCs) sensing measurements indicated a noticeable improvement of response and decrease of working temperature for Co 3 O 4 /ZnO sensor, in comparison with pure ZnO, i.e ., the response towards 100 ppm acetone was 63.7 (at a low working temperature of 180 °C), which was 26 times higher than pure ZnO (response of 2.3 at 240 °C). Excellent VOCs response characteristics could be ascribed to increased surface oxygen vacancy concentration (revealed by defect characterizations), catalytic activity of Co 3 O 4 and the special p-n heterojunction structure, and bacterial cellulose provides a facile template for designing diverse functional heterojunctions for VOCs detection and other applications.
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2018
·Vol. 31
·期 6
·789-798
·
IF 0.586
Wang Xiao-yan,Fan Hai-yan,Ye Xiao-dong,Liu Shi-lin,Zhang Guang-zhao
Two narrowly-distributed poly( N - isopropylacrylamide) (PNIPAM) samples were prepared via atom transfer radical polymerization (ATRP) with a novel dansyl functionalized initiator. The other end of the PNIPAM was functionalized by dabcyl group via click reaction. From the static fluorescence measurements, the fluorescence intensity of dansyl group and energy transfer efficiency between dansyl and dabcyl groups increased when the temperature increased from 36 °C to 45 °C, indicating that the microenvironment surrounding dansyl became hydrophobic and the distance between dansyl and dabcyl decreased. The kinetics of the conformational change of the dye-labeled PNIPAM was studied by a home-made laser-induced temperature jump device with fluorescent measurement. Our results revealed that the characteristic transition time was 3.8 and 5.8 ms for PNIPAM with degrees of polymerization of 85 and 142, respectively, indicating that the characteristic transition time was related to the chain length. Besides, characteristic transition time for the change of the energy transfer efficiency was 2.9 ms for PNIPAM with the degree of polymerization of 85, suggesting that the energy transfer efficiency change was faster than the fluorescence intensity change of dansyl group.
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DOI
高影响因子
PHYSICS OF FLUIDS
·
2021
·Vol. 33
·期 2
·
IF 3.521
Zhao Wenjing,Ma Hongzhi,Ji Wenjie,Li Weibin,Wang Jin,Yuan Quanzi,Wang Yuren,Lan Ding
Flows of thin fluid layers spreading, which have a distinguished history, have been studied since the days of Reynolds, who was among the early researchers to examine flows. Different from surfactant-driven spreading, which is currently the most common subject of study, we observe the spreading process of n -hexadecane driven by volatile silicone oil at the surface of the aqueous substrates and explore the influence of Marangoni flow caused by surface tension gradient on liquid-driven spreading. We find that on different substrates, the initial state of n -hexadecane is different, and there are two instability patterns during the spreading, subsequently, which are analyzed theoretically. While the n -hexadecane drop stationed on the liquid surface is small, it is driven to form a rim and then breaks up into beads, which shows the Rayleigh–Plateau instability patterns. When we put the n -hexadecane drop on the surface of the saturated sodium chloride solution, which spreads out more, it is driven to form a circular belt first and fingering instability subsequently occurs at the inner edge of the circular belt.
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DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 7
·2147-2154
·
IF 8.02
Alei Zhang,Cong Gao,Jing Wang,Kequan Chen,Pingkai Ouyang
In this study, we present an efficient affinity adsorption–enzymatic reaction integrated approach to produce N-acetyl-D-glucosamine (GlcNAc) from crude chitin powders (CP). Chitinase was first purified from the crude enzyme mixture by affinity adsorption on the CP substrate, with ∼92.7% recovery of the enzyme achieved within 10 minutes in the presence of 20 g L−1 of CP under optimized conditions. The chitinase then efficiently converted 40 g L−1 of CP to 39.3 g L−1 of GlcNAc in a batch enzymatic reaction for 4 days, achieving nearly 100% conversion of the substrate CP. The product GlcNAc was easily separated from hydrolysates after destaining, concentrating, crystallizing and drying processes with a high purity of 98%. In addition, the chitinase can be conveniently reused for several batches by the affinity adsorption–enzymatic reaction approach, giving an average yield of 29.6 g L−1 of GlcNAc based on 30 g L−1 of CP as the substrate.
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DOI
高影响因子
AICHE JOURNAL
·
2020
·Vol. 66
·期 11
·e17023
·
IF 3.519
Yaoming Wang,Xiaoli Wang,Haiyang Yan,Chenxiao Jiang,Liang Ge,Tongwen Xu
In this study, cleaner production of N -methylglycine (NMG), N , N -dimethylglycine (DMG), and N , N , N -trimethylglycine (TMG) with similar structures but different methylate groups was performed using bipolar membrane electrodialysis (BMED). The effects of the feed mass concentration and current density on the separation performance were intensively analysed in terms of the molecular size, molecular structure, ion concentration, and interaction between amino acids and membranes. The results indicated that the optimal recovery performance was achieved at a current density of 200 A/m 2 and feed mass concentration of 6%. Under the optimal conditions, the energy consumption and current efficiencies were 2.3 kWh/kg and 78% for NMG, 2.49 kWh/kg and 69.5% for DMG, and 3.52 kWh/kg and 39.6% for TMG, respectively. It was speculated a competition for water splitting occurs between the bipolar membranes and anion exchange membranes when BMED is used for the separation and purification of large-sized bioproducts.
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2014
·
IF 1.332
Yun Zhang,Guangqing Zhuang,Yanrong Jia,Qinguo Fan,Jianzhong Shao
(SiO2/PEI)n films with structural colors on polyester fabrics were fabricated using negatively charged SiO2 nanoparticles and positively charged polyethyleneimine (PEI) using the electrostatic self-assembly approach. The bright and variable structural colors of polyester fabrics coated with a (SiO2/PEI)n film were investigated through the color photos captured by a digital camera, and also through the reflectance spectra and the images measured by a DigiEye system and a multi-angle spectrophotometer. The morphological structure of (SiO2/PEI)n films was characterized by scanning electron microscopy (SEM), and the electrostatic self-assembly process and the driving forces of fabricating the (SiO2/PEI)n films were investigated and schematically illustrated. The results showed that the structural colors varied with the various assembly cycles and viewing angles; both the optical properties indicated by the structural colors and the morphological structures illustrated by the SEM images confirmed that the (SiO2/PEI)n film on a polyester fabric was a homogeneous porous composite monolayer, with structural colors originated from single thin film interference; the self-assembly process of (SiO2/PEI)n film on a polyester fabric was driven by multi-forces, with dominant forces equilibrium of electrostatic attraction and repulsion.
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Chi Chen,Zhuye Li,Baoming Xu
The C&N coated Li 2 ZnTi 3 O 8 is synthesized by heat-treating pristine Li 2 ZnTi 3 O 8 and urea (CO(NH 2 ) 2 ) at 400 °C for a short time. The content of the C&N layer of the C&N coated Li 2 ZnTi 3 O 8 is ~3.5 wt% and the N content of 2.06 wt% is achieved. After coupling with a C&N layer, the C&N coated Li 2 ZnTi 3 O 8 delivers a discharge specific capacity of 230.1, 211.9, 197.4, 190.6 and 180.4 mAh g −1 after 10 cycles at the current density of 0.1, 0.5, 1.5, 2.5 and 4.0 A g −1 , respectively, and exhibits a remarkable stability over 400 cycles at 1.5 A g −1 . The effect of the formed C&N layer on the structure and electrochemical properties of the C&N coated Li 2 ZnTi 3 O 8 has been characterized by a series of means.
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Ping Qiu,Yongyong Lai,Xulu Sun,Changfeng Chen,Lei Ge
Various approaches have been developed to enhance n-type Cu 2 O photoelectrochemical activity. This study introduced a simple method of tuning electronic structure through adjusting solution pH when electrodeposition of Cu 2 O films on FTO substrate. Combined surface analysis showed that the Cu 2 O films presented gradual change cruciate flower-like nanostructure and hybrided with metallic copper. The Cu/Cu 2 O films presented a visible light response and the band gap could be effectively decreased by increasing the deposition solution pH. The photoelectrochemical cathodic protection performance of the films was studied. The electrode potential of 304 stainless steel by coupling with the Cu/Cu 2 O films (deposited at pH 5) reached the most negative photopotential shift of 179 mV under illumination. The related photocurrent density was 0.12 mA/cm 2 . This enhanced photoelectrochemical performance was evidenced by both direct excitation of Cu 2 O and the surface plasmon resonance effects of Cu upon illumination.
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DOI
高影响因子
危险品化学品经营许可证（带存储）