Chemical Engineering and Processing-Process Intensification
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2023
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IF 4.3
Xi-shuo Wang,Ying-jiao Li,Ting-ting Qi,Ji-wen Fu,Guang-Wen Chu,Bao-chang Sun
In industry, H-type zeolites are usually synthesized under hydrothermal conditions in the sodium-containing system, in which great deal of ammonia nitrogen wastewater will be produced during the transformation of zeolites from Na-type to H-type. In this work, we prepared ZSM-5 zeolites in the sodium-free system using organic amines in a rotating packed bed (RPB), which can greatly reduce the amount of wastewater. It was found that the ZSM-5 zeolites synthesized by isopropanolamine (MIPA) had the highest acid amount with a value of 2.331 mmol/g compared to that by other three amines, and exhibits the highest conversion of benzaldehyde with a value of 77.63% in the acetal reaction of benzaldehyde and ethylene glycol . More importantly, RPB premixing can improve the transfer of Al into the framework of ZSM-5 zeolites relative to conventional stirring technique. This work provided a new route to prepare ZSM-5 zeolites with high acid amount in sodium-free system.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Molecular Catalysis
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2025
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IF 4.9
Weitao Wang,Kang Wang,Huan Wang,Jiaqi Zhu,Zhen-Hong He,Zhao-Tie Liu
Selective oxidation of benzyl alcohol to benzaldehyde with molecular oxygen is a typical oxidation in synthetic chemistry. In present, Mn-Cu bimetal oxide spinel catalyst was prepared and characterized. The content of surface oxygen vacancies can be adjusted by the molar ratio of Cu to Mn during the preparation process and oxygen vacancies were found positively related to the activity of entitled reaction. The solvent effect on the reaction is investigated. The reaction conditions of the entitled reaction were optimized and the conversion of benzyl alcohol can reach 98.5 % with 100 % selectivity to benzaldehyde at 70°C for 8 h. The catalyst is stable and can be reused for 5 times without any significant decrease in its catalytic performance. In addition, the reaction was studied from the aspect of kinetic to reveal the reason of high selectivity.
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 Physical Chemistry C
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2025
·
IF 3.2
Xiang Chen,Shaohua Chen,Pengxin Liu,Chaodan Pu
We report the efficient C–C coupling between benzyl alcohol and benzaldehyde to hydrobenzoin using CdSe/CdS quantum dots as visible-light photocatalysts and sodium oxide as a cocatalyst. The optimized conditions resulted in a reaction with a selectivity of hydrobenzoin >95%, an apparent quantum yield of 23.6% under the excitation by 520 nm LED, and a turnover frequency of 56.8 mmol g–1 h–1. Reactant concentration-dependent experiments demonstrated that benzaldehyde can process fast proton-coupled electron transfer, improving the utilization of photogenerated electrons. Photoluminescence quenching experiments and reactions with deuterated benzaldehyde confirmed that due to the in situ produced hydrogen ions, the hydroxymethyl radicals would process efficient reverse conversion from hydroxymethyl radicals to benzyl alcohol, resulting in noneffective charge transfer. Formation of sodium benzyloxide can eliminate the in situ produced hydrogen ions around the hydroxymethyl radical, suppressing this reverse conversion and improving the utilization efficiency of transferred holes and electrons.
研究领域:
化学
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材料科学
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DOI
高影响因子
Molecular Catalysis
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2024
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IF 3.9
Jiaqi Zhou,Qingrong Wang,Hong Liu,Ming Bao,Jiasheng Wang
Gas-phase selective oxidation of toluene with air is a promising method for producing high-purity benzaldehyde, but the yields of existing catalysts are limited, so the development of more efficient catalysts is of great importance to the chemical industry. Herein VMoNb/CeO 2 was prepared and characterized by SEM, XRD, Raman, XPS, H 2 -TPR, and NH 3 -TPD. The introduction of Mo generated V–O–Mo “asymmetric lattice oxygen” and thus brought high activity. Nb moderated the acidity and oxygen vacancy so as to improve the selectivity. The VMoNb/CeO 2 catalyst showed very high catalytic activity at 500 °C, with 35% toluene conversion and 82% benzaldehyde selectivity at an air flow rate of 30 mL/min for V:Mo:Nb =2:5:0.8. This work could serve as a reference for designing mixed metal oxide catalysts for selective oxidation of aromatic hydrocarbons.
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
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Yajie Feng,Chi Lin,Yifei Huang,Bing Li,Yingxin He,Jiangping Ma,Chaogang Ban,Lujie Ruan,Hongxing Jia,Xiaoping Tao,Liyong Gan,Xiaoyuan Zhou
The metal–metal interactions between different metal atoms within dual-metal-supported catalyst have garnered significant attention in effectively regulating the chemical and electronic structure of active sites, thus providing enormous opportunities to optimize the catalytic performance. Herein, by loading Cu clusters and Pd nanoparticles on TiO 2 (CuPd/TiO 2 ), it is found that Cu clusters enable the metalize transformation of Pd as a result of the metal–metal interactions between Cu and Pd, which remarkably improves the surface catalytic reaction as well as the separation and transfer of photogenerated carriers. The resultant photocatalyst exhibits an excellent activity for H 2 evolution coupled with benzyl alcohol oxidation, achieving yield rates of 43.7 μmol h −1 for H 2 and 22.0 μmol h −1 for benzaldehyde, and an apparent quantum efficiency (AQE) of 20.4 % at 313 nm for hydrogen evolution. This integration of metal–metal interactions within the dual-metal-supported catalyst open a new avenue for the design of advanced photocatalysts.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Ning Wu,Hao Guo,Xiaoqiong Wang,Lei Sun,Tingting Zhang,Liping Peng,Wu Yang
This paper studies the application of lanthanide metal-organic frameworks (Ln-MOFs) in fluorescence detection . The europium-based metal-organic frameworks (Eu-MOFs) are synthesized by a facile solvothermal method , and then the as-prepared MOF were further characterized by PXRD , FT-IR, TG, EDS, SEM, UV–vis spectra and fluorescence spectroscopy. The results demonstrate that Eu-MOF exhibits an intense red fluorescence, which can be readily observed by naked eye in solid state, good structural stability and fluorescence stability in aqueous solution or other organic solvents , especially high selectivity and sensitivity to Fe 3+ and benzaldehyde and the visible color change by the naked eye under UV-light. This luminescent MOF can be used to detect Fe 3+ and benzaldehyde in an aqueous environment with low detection limits of 0.027 μM for Fe 3+ and 0.011 μM for benzaldehyde.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2015
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IF 3.615
Huiyan Pan,Xiaohong Li,Yin Yu,Junrui Li,Jun Hu,Yejun Guan,Peng Wu
Metal organic-framework MIL-101 and inorganic mesoporous composites Al 2 O 3 @SBA-15 supported Pt catalysts, Pt/MIL-101 and Pt/Al 2 O 3 @SBA-15 catalysts, were prepared and characterized by means of X-ray diffraction (XRD), N 2 adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), CO chemisorption and thermo-gravimetric (TG) analysis. Pt nanoparticles were highly dispersed on both supports. In liquid-phase hydrogenation of nitrobenzene, benzaldehyde and their derivatives, the Pt/MIL-101 catalyst was superior to the Pt/Al 2 O 3 @SBA-15 catalyst in water. For liquid-phase hydrogenation of nitrobenzene with the Pt/MIL-101 catalyst, owing to high solubility of nitrobenzene in ethanol, the reaction in ethanol went much faster than that in water, furnishing a turnover frequency (TOF) in ethanol up to 18,053 h −1 , almost triple of that obtained in water under similar conditions. The highest TOF of 25,438 h −1 was obtained in ethanol for hydrogenation of 3-chloro-nitrobenzene with the Pt/MIL-101 catalyst. As for hydrogenation of benzaldehyde series, 2-fluoro-benzaldehyde and 3-fluoro-benzaldehyde gave the highest TOFs of 5146 h −1 and 3165 h −1 in water with the Pt/MIL-101 and Pt/Al 2 O 3 @SBA-15 catalysts, respectively. We deduce that surface property of MIL-101 with high hydrophobicity is helpful to enrich reactants around the Pt/MIL-101 catalyst in water, where nitrobenzene or benzaldehyde and its derivatives have a limited solubility, so that high catalytic performance was achieved with the Pt/MIL-101 catalyst in water. Of particular note is that the Pt/MIL-101 catalyst can be reused at least four times without loss in activity or selectivity.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 8
·2341-2347
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IF 4.853
Bai-Chuan Zhou,Qing-Nan Wang,Xue-Fei Weng,Lei He,Wen-Cui Li,An-Hui Lu
Graphical Direct production of benzyl alcohol : The distribution of aromatic alcohols on cobalt-hydroxyapatite is greatly switched from methylbenzyl alcohol (feeding ethanol) to benzaldehyde (C 7 , BA=O) and benzyl alcohol (C 7 , BA−OH) by cofeeding of methanol and ethanol. Aromatic alcohols, often used for the synthesis of plasticizers, coatings and pharmaceuticals, are currently produced from the oxidation of petroleum-derived aromatic hydrocarbons. Herein, we report a non-petroleum and environmentally friendly route for the production of aromatic alcohols: cofeeding methanol with ethanol over cobalt-hydroxyapatite catalyst, in which the distribution of aromatic alcohols products can be regulated by varying methanol pressure. Co species on hydroxyapatite can activate both methanol and ethanol to yield their corresponding aldehydes (formaldehyde and acetaldehyde). The followed cross- and self-condensations of aldehydes are catalyzed by hydroxyapatite to produce acrolein and 2-butenal, which are the key intermediates for the formation of aromatic oxygenates. The sequential cross-condensation and dehydrocyclization of acrolein and 2-butenal yield benzaldehyde, which is then hydrogenated to benzyl alcohol. The direct production of benzyl alcohol from methanol and ethanol could be regarded as a cutting-edge example, which ensures a promising route for sustainable aromatic alcohols production.
研究领域:
化学工程
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催化科学
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Lingzhi Zhou,Xian Xie,Xiong Tong,Jing Qi,Ruiqi Xie,Jichang Tu
This study introduced α-Benzoin oxime (BO) as a novel and efficient collector for the selective flotation of ilmenite from diopside. Micro-flotation experiments demonstrated that BO exhibits superior collection performance compared to benzohydroxamic acid (BHA) under weakly acidic to neutral conditions. At pH 8 and a BO dosage of 5× 10 -4 mol/L, flotation tests on ilmenite-diopside mixed minerals achieved a TiO 2 recovery of 89.90 % with a TiO 2 grade of 47.84 %. Contact angle measurements revealed that BO adsorption notably enhances the hydrophobicity of ilmenite surfaces. Zeta potential and FTIR analyses confirmed the selective adsorption of BO onto ilmenite. Furthermore, XPS and TOF-SIMS results indicated that coordination bonds formed between the C–O and C=N–OH groups in BO and Fe(II) ions on the ilmenite surface may facilitate BO adsorption. These findings provide valuable insights into the interaction mechanism between BO and ilmenite, highlighting its potential as an efficient collector for ilmenite flotation.
研究领域:
矿物加工工程
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材料科学与工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Dequan Wei,Shenghua Lv,Jingjing Zuo,Shan Liang,Jialin Wang,Tingxiang He,Leipeng Liu
Chitosan, as a natural biomass material, is green, recyclable, sustainable and well biocompatible. The molecular chain is rich in active groups such as amino and hydroxyl groups, and its preparation of fluorescent probes has the advantages of biocompatibility and efficient detection performance. In this study, a bis(benzaldehyde) (BHD) fluorescent functional molecule was designed. Then a series of fluorescent chitosan-based hydrogel films (CSBHD) were prepared using chitosan as raw material and BHD as cross-linking agent. As a fluorescent probe for metal ions, CSBHD was able to efficiently detect Fe 2+ with a linear correlation of fluorescence intensity in the range of 0–160 μM, and the limit of detection (LOD) was 0.55 μM. Moreover, it has excellent adsorption performance for Fe 2+ ions, with a maximum adsorption capacity of 223.5 g/mg at 500 mg/L Fe 2+ concentration. Finally, we characterised the structure and microscopic morphology of CSBHD films and found that CSBHD as a hydrogel film has a high cross-linking density, good water resistance, excellent thermal stability, strong resistance to swelling, and excellent stability in cycling tests. Hence, it has great potential for application in adsorption and detection of Fe 2+ ions. It also provides a good strategy for the application of chitosan based fluorescent probe materials in environmental monitoring and heavy metal ion adsorption.
研究领域:
材料科学
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环境科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
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IF 9.5
Jianghua Zhang,Zuzeng Qin,Xuan Luo,Tongming Su,Xinling Xie,Hongbing Ji
The demand for natural benzaldehyde in fragrances and pharmaceuticals exceeds its supply because of consumer habits and stringent regulations. Sustainable development necessitates using eco-friendly methods for synthesizing organic compounds. This study investigates the selective photocatalytic oxidation of cinnamaldehyde to benzaldehyde using oxygen. Dual-functional xBi0/BiVO4 photocatalysts were prepared in situ by tuning the Bi/V molar ratio. xBi0/BiVO4 retained the photosensitizer properties of BiVO4, while Bi deposition on BiVO4 enhanced the generation of photogenerated electrons and the adsorption capacity for oxygen and cinnamaldehyde. The catalysts rapidly converted adsorbed oxygen into singlet oxygen, which contributed to the selective oxidation of cinnamaldehyde, achieving a benzaldehyde selectivity of 47–59%. Photogenerated electrons facilitated the formation of superoxide radicals, improving benzaldehyde selectivity and counteracting deactivation for sustained xBi0/BiVO4 activity. In this study, we synthesized an efficient and durable photocatalyst for oxidizing CC bonds in α,β-unsaturated aldehydes, addressing limitations of existing photocatalytic processes.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Solar RRL
·
2022
·Vol. 6
·期 8
·2200279
·
IF 9.173
Jie Deng,Wanying Lei,Junwei Fu,Huile Jin,Quanlong Xu,Shun Wang
Herein, photocatalytic selective oxidation of hydrocarbons through O 2 represents a promising way for fine chemical industry on account of its mild reaction condition. In this work, Co 3 O 4 -modified BiOBr/AgBr S-scheme heterojunction can effectively oxidize sp 3 C H bonds at benzylic position to its corresponding aldehydes, with a toluene to benzaldehyde selectivity of 94%, which is much higher than that of pure BiOBr (21.7%) and AgBr (58.9%). A unique S-scheme charge-transfer mode is confirmed for the ternary composites by the X-ray photoelectron spectroscopy and reactive species quenching measurement. The remaining photogenerated electrons in AgBr with powerful reduction ability can react with O 2 to generate •O 2 − species, which can further oxidize the benzyl radical formed on the Co 3 O 4 surface to peroxyl radicals and then thermodynamically decompose to benzaldehyde. Herein, this work has important guiding significance for the structure regulation of photocatalysts and application in selective oxidation of sp 3 C H bond of hydrocarbons.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
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