APPLIED CATALYSIS A-GENERAL
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2018
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IF 4.521
Junbo Feng,Wei Jiang,Caicai Yuan,Xiancai Shi,Kai Zang,Yadong Zhang
A novel core/shell nano-bimetallic catalyst SiO 2 @Ni-Rh was successfully prepared by deposition–precipitation method, using liquid ammonia as a precipitating agent. SEM, TEM, XRD, XPS, H 2 -TPR, H 2 -TPD and adsorption/desorption of nitrogen were employed to systematically investigate the surface morphology, size, chemical composition, reducibility, Ni dispersion and structure of the as-synthesized nanoparticles. It is found that the nickel and rhodium are uniformly dispersed on the silica surface to form core/shell SiO 2 @Ni-Rh nanoparticles with Ni atoms and Rh atoms as the outer shell and SiO 2 as the core, which possess high dispersion of Ni on the surface and high specific surface area (234.063 m 2 /g) of the catalyst with the mean particle size of ca. 130 nm. The dehydrogenation of 2-methoxycyclohexanol to guaiacol was used as the model reaction for evaluating the catalytic activity of the as-synthesized core/shell various Ni and Rh-containing bimetallic nanoparticles in a tubular stainless steel reactor. SiO 2 @15Ni-0.4Rh nanoparticles have exhibited remarkable catalytic performance, with 98.3% conversion and 93.6% selectivity of guaiacol, due to high dispersion of metal nanoparticles and synergistic effect of bimetallic Ni-Rh over the special core/shell SiO 2 @Ni-Rh by the addition of rhodium. Furthermore, turn over frequency value of SiO 2 @15Ni-0.4Rh nanoparticles achieves 0.47 s −1 , showing high catalytic efficiency. In general, the dehydrogenation of 2-methoxycyclohexanol over the core-shell-like SiO 2 @Ni-Rh nanoparticles in a continuous fixed-bed reactor is a more promising, high atom economy, high efficient, easy separation, environmental friendliness, green synthetic pathway of guaiacol.
研究领域:
催化化学
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材料科学
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENTIA HORTICULTURAE
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2023
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IF 4.3
Cuiping Hua,Zhanjun Zhang,Zhihong Guo,Hailian Wei,Yajun Wang,Ruoyu Wang,Yubao Zhang,Yang Qiu,Zhongkui Xie
Phenolics from the rhizosphere soil are a key factor that leads to obstacles in the continuous cropping system. While we tested the phenolics in the rhizosphere soil of Lanzhou lily ( Lilium davidii var . unicolor ), a high relative content 4-Vinyl Guaiacol (4-VG) was firstly detected. Therefore, we attempted to explore the role of 4-VG stress in Lanzhou lily physiology and disease, and the potential enhanced effects of pathogenicity in Fusarium oxysporum B4 ( F. oxysporum B4). The effects of different concentrations of 4-VG (0, 0.01, 0.05, 0.1, 0.2, 0.5, 1 mM) on the growth of F. oxysporum B4 and the production of fusaric acid were examined. The result indicated that 4-VG inhibited the growth of F. oxysporum B4 hypha, promoted spore germination, and increased fusaric acid content. Furthermore, transcriptome sequencing of F. oxysporum B4 hypha after stress mediated by 0.5 mM 4-VG was performed to help characterize the response mechanism to 4-VG. Compared with the control group, differentially expressed genes (DEGs) were mainly related to the growth and fusaric acid synthesis of F. oxysporum B4. Except that, the increase of infection area formed after F. oxysporum B4 infected the squama of Lanzhou lily under the high concentration of 4-VG was measured and indicated that 4-VG played a role in the F. oxysporum B4 infection. The exogenous addition of 4-VG significantly inhibited the growth and health of Lanzhou lily. Under the dual stress of F. oxysporum B4 and different concentrations of 4-VG, it significantly enhanced the incidence and disease index of Lanzhou lily. These results suggest the key role of 4-VG from rhizosphere soil in the occurrence of Lanzhou lily Fusarium wilt.
研究领域:
植物病理学
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分子生物学
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农业科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
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IF 2.679
Hao Li,Shuqian Xia,Meng Wu,Peisheng Ma
Developing value-added chemicals from pyrolysis oil has been gaining increasing attention. Thus effective separation and purification of the pyrolysis oil are important and the phase equilibrium data are essential for the design and simulation of the processes. In this study, isobaric vapour–liquid equilibrium (VLE) for the two binary mixtures (butyl acetate + anisole) and (butyl acetate + guaiacol) have been determined at 101.33 kPa, a knowledge of which is essential for the separation of methoxy aromatic compounds (anisole and guaiacol) from biomass fast pyrolysis oil using butyl acetate as a solvent. All the experimental values were confirmed to be thermodynamically consistent using the van Ness method. The NRTL, UNIQUAC, and Wilson activity coefficient models were applied to regress the experimental values. The calculated results agreed well with the measured values. Furthermore, the results were calculated by the UNIFAC (Do) method (modified UNIFAC model) in which aromatic methoxyl is treated as a group (ACOCH 3 ). The new interaction parameter (ACOCH 3 –CH 3 COO) was obtained and proved to be reliable. Based on the preceding results, a feasible separation process for the ternary mixture (butyl acetate + anisole + guaiacol) has been designed to obtain the required products.
研究领域:
化学工程
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2022
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IF 3.428
Hengyu Xu,Chen Qian,Xiaojie Tan,Wei Xia,Yulong Wu
This paper investigates the fabrication of Co-doped carbon nitride (C 3 N 4 -Co) and its application in degrade 4-chloro-guaiacol. Co-doped carbon nitride significantly enhanced the photocatalytic activity for 4-chloro-guaiacol degradation compared to unmodified carbon nitride. Under the same conditions, the degradation rate of 4-chloro-guaiacol by unmodified C 3 N 4 was only 30.7 %, however it increased to 73.7 % by Co-doped carbon nitride (0.25 wt%). Co-doping can extend the wavelength range, improve oxygen adsorption, and reduce electron-hole recombination. However, the greater the amount of Co-doping. But, when the doping level is too high, excessive oxygen adsorption may occur on the surface of the active site, obstructing 4-chloro-guaiacol adsorption and reducing the catalytic efficiency. This work could provide useful information regarding AOX degradation for future research.
研究领域:
环境化学
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材料科学
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光催化
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水处理
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2021
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IF 5.03
Rui Zhang,Feng Bao,Zhi-Huan Weng,Li-Shuai Zong,Jin-Yan Wang,Xi-Gao Jian
To reduce the dependence on non-renewable resources and to address environmental issues, bio-based high-performance poly(aryl ether ketone), PGFEKK, is prepared using two bio-based monomers derived from guaiacol and 2,5-furandicarboxylic acid. With a biomass content of 64.9%, it is the highest biomass content for poly(aryl ether ketone)s reported to date. In this report, the reaction of the bio-based monomers 6-(4-hydroxy-3-methoxyphenyl) pyridazin-3(2H)-one (GSPZ) and furan-2,5-diylbis((4-fluorophenyl)methanone) (BFBF) is carried out via base-catalyzed nucleophilic substitution. The optimum conditions for the reaction are studied using orthogonal experiments and PGFEKK is obtained with a molecular weight up to 21.5 kg/mol, a glass transition temperature of 212 °C, a 10% weight loss temperature of 452 °C, and a tensile strength of 84 MPa. In addition, PGFEKK has a melt viscosity of only 207 MPa at 329 °C and dissolves in most solvents at room temperature. Such a high-performance bio-based poly(aryl ether ketone) has never been reported before. Furthermore, to study the mechanism of how two bio-based monomers affected the polymerization process and material properties, three other polymers are prepared using two petroleum-based monomers, DHPZ and BFBB, instead of GSPZ and BFBF, by analyzing the molecular simulations and the properties of the materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
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2024
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IF 6.7
Junqian Wang,Yi Wang,Yuqi Wang,Xinyi Li,Caichao Wu,Tianyu Zhang,Bin Tian,Lili Qian,Yang Guo,Le Wu,Lan Zheng,Yanan Li,Xin Ding
Currently, traditional hydrodeoxygenation (HDO) catalysts have various shortcomings such as low activity levels and vulnerability to deactivation. Therefore, a series of MXene-supported Ni-M (M = Pd, Pt, Ru) bimetallic catalysts were designed and prepared. The above catalysts were also comprehensively characterized using XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, SEM and TEM methods. Moreover, due to the largest particular specific surface area, moderate amount of acid sites and the strongest three-electron transfer channels between support and active metals of Ni-Pd/MXene catalyst, it exhibited the superior catalytic performance to achieve 100 % guaiacol conversion and 35.15 % highest overall yields of HDO products (Y HDO ) under the optimal reaction conditions (at 340 °C for 8 h, utilizing in-situ hydrogen source: formic acid). Furthermore, a detailed discussion on the main reaction pathways and mechanism of guaiacol HDO catalyzed by Ni-Pd/MXene was provided, an unique bimetallic synergistic “relay catalytic” theory has been proposed. Kinetic studies revealed that phenol, one of the main HDO products, is primarily generated via guaiacol demethoxylation, while catechol dehydroxylation to phenol acts as the rate-determining step. This work introduces a new strategy for the development of HDO catalysts.
研究领域:
化学工程
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催化科学
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能源材料
✓ 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）