CHINESE JOURNAL OF CATALYSIS
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2012
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IF 1.171
Xiantai ZHOU,Hongbing JI
The highly efficient aerobic oxidation of alcohols to carbonyl compounds was achieved catalyzed by cationic meso -tetrakis (1-methyl-4-pyridyl, TM4PyP) metalloporphyrins immobilized in montmorillonite interlayers. Cobalt porphyrin (CoTM4PyP-MT) showed excellent activity and selectivity in the aerobic oxidation of benzyl alcohol, where 90% yield of benzaldehyde was obtained. CoTM4PyP-MT can be five times reused without significant loss of activity. 摘要 制备了蒙脱土负载的离子型四 (1-甲基-4-吡啶基) 金属卟啉, 并用于催化醇类氧化制备羰基化合物的反应中. 结果表明, 该催化剂表现出优异的活性和产物选择性, 其中在苯甲醇氧化反应中, 苯甲醛收率可达 90%, 且连续重复使用 5 次后, 其活性未见明显下降.
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
Sustainability
·
2023
·Vol. 15
·期 17
·13034
·
IF 3.9
Tiantian Ye,Lihong Liu,Yilin Wang,Jianqiang Zhang,Zhenxing Wang,Cong Li,Haoyu Luo
In this study, an innovative method for RhB (Rhodamine B) degradation in a persulfate (PS) and hand warmer heterogeneous activation system was investigated. The hand warmer showed better catalytic performance and excellent reusability in terms of PS activation. The reaction rate constants of RhB removal in the hand warmer/PS process (0.354 min−1) were much faster than those in other PS- and Fe-related processes (0.010–0.233 min−1) at pH 7. The iron in the hand warmer is the main active ingredient to catalyze PS, and activated carbon, salt, and H+/OH−accelerate the activated reaction due to the formation of micro-batteries in the solution. Moreover, the catalyst of the hand warmer showed excellent stability and reusability with a low level of iron leaching. This new, effective, inexpensive, repeatable, and environmentally friendly catalyst combined with PS has promising prospects for the removal of dyes from industrial wastewater.Keywords:heterogeneous activation;persulfate;hand warmer
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Yunfei Liu,Hewei Yu,Xiuxiu Chen,Zekai Sun,Lizeng Peng,Hongyu Si
This study focused on the optimized preparation of biodiesel over a ZrO 2 -modified CaO catalyst. CaO/ZrO 2 catalysts were synthesized by impregnation, co-precipitation, and sol-gel methods, and analyzed by various characterization methods, including N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermally programmed desorption of CO 2 (CO 2 -TPD), and scanning electron microscopy (SEM). The CaO/ZrO 2 catalyst synthesized by the impregnation method had a uniform microstructure, good crystallinity, a uniform spherical particle structure with large pores and slits, and a density of surface alkali sites of 1.898 mmol g - 1 . Using the impregnation method, the best synthesis conditions were determined as a calcination temperature of 700 °C and a Ca/Zr molar ratio of 3:2. Furthermore, the optimal reaction conditions were determined by single-factor experiments as a catalyst dosage of 8 wt%, a molar ratio of methanol to oil of 12, a reaction temperature of 64 °C, and a reaction time of 2 h. Under these reaction conditions, the yield of fatty acid methyl esters (FAME) reached 95.9 %, decreasing only marginally to 77.6 % after four reuses of the catalyst. It is hoped that this study may provide important research guidance for developing solid basic catalysts for preparing FAME by transesterification under mild conditions.
研究领域:
催化化学
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可再生能源
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2011
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IF 3.384
Lincai Peng,Lu Lin,Junhua Zhang,Jianbin Shi,Shijie Liu
A series of solid acid catalysts including SO 4 2− /ZrO 2 , SO 4 2− /TiO 2 , SO 4 2− /ZrO 2 –TiO 2 and SO 4 2− /ZrO 2 –Al 2 O 3 were prepared by precipitation and impregnation method for ethyl levulinate production from glucose in ethanol. Effects of various reaction parameters and catalyst reuse cycle towards the reaction performance were studied. Experimental results showed that different components of the sulfated metal oxides had markedly different catalytic effects on the ethanolysis of glucose. SO 4 2− /ZrO 2 –Al 2 O 3 could significantly suppress the formation of ethyl levulinate due to the incorporation of Al 2 O 3 . With SO 4 2− /ZrO 2 as the catalyst, an optimized ethyl levulinate yield of above 30 mol% was obtained at 200 °C for 3 h with catalyst dosage of 2.5 wt%, and the recovered catalyst after calcination was found to remain active with an almost unchanged product yield after being reused five times. The main liquid substances including ethyl levulinate, diethyl ether and ethanol can be easily separated from the resulting product mixture by fractionation and the excess ethanol was recycled. The physicochemical properties of the prepared and thermally regenerated catalysts were characterized using BET surface area, XRD, NH 3 -TPD and XPS techniques.
研究领域:
化学工程
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可再生资源转化
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 6
·6181-6190
·
IF 1.833
Wang Meng-Meng,Liu Shi-Wei,Li Lu,Yu Shi-Tao,Xie Cong-Xia,Song Zhan-Qian
Rosin hydrogenation using polyvinylpyrrolidone (PVP)-stabilized Pd colloidal nanoparticles as catalyst in an aqueous/organic biphasic system was investigated. The influence of preparation methods on the size of Pd nanoparticles for hydrogenation of rosin was marked. Compared with traditional catalysts Pd/C and Raney-Ni, PVP-stabilized Pd colloidal nanoparticles showed excellent catalytic activity and promoted formation of the product tetrahydroabietic acid (THAA). More than 93 % rosin was hydrogenated, and the mass fraction of THAA was 54.2 % when the reaction was carried out at 160 °C for 4 h. It was also found that PVP-stabilized Pd colloidal nanoparticles exhibited good reusability for hydrogenation, with no obvious decrease in catalytic performance when reused six times.
研究领域:
催化化学
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纳米材料
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有机合成
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绿色化学
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胶体化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
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IF 3.9
Min Xu,Zhayun Gong,Yangyang Wu,Zhiyong Zhu,Kun Wang,Hefeng Xu,Cong Yu,Xiaodong Chu
4-Nitrophenol (4-NP) pollution in the chemical, dye, and other industries poses significant risks to humans and aquatic organisms. In this study, we prepared metal oxide-supported gold nanoparticles (AuNPs/Al2O3, AuNPs/TiO2, and AuNPs/ZnO) and applied them to the catalytic reduction of 4-NP. The Bader charge and differential charge, dos and d band centers, work function, and reaction free energy of AuNP composites were analyzed through DFT calculations. The influence of metal oxide carriers on the catalytic activity of AuNPs was explored, which decreased in the following order: AuNPs/Al2O3 > AuNPs/TiO2 > AuNPs/ZnO. In addition, the catalytic reduction performance of these AuNP composites for 4-NP in the presence of NaBH4 was investigated. The results showed that the AuNPs/Al2O3 catalyst exhibited the best performance (3.62 ± 0.17 min–1), consistent with the theoretical calculations. Meanwhile, the AuNPs/Al2O3 catalyst exhibited good reusability. More relevantly, the catalytic reduction mechanism of metal oxide-supported AuNPs for 4-NP was proposed from both experimental and theoretical calculations.
研究领域:
催化化学
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环境科学
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纳米技术
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材料科学
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理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
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2024
·Vol. 14
·期 49
·36622-36632
·
IF 3.9
Lijun Xu,Qian Tong,Bing Hu
Through a simple room-temperature process, different amounts of Keggin-type quaternary ammonium silicotungstate were successfully encapsulated into the metal–organic framework (MOF) material ZIF-67. The catalysts were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and BET analysis. An extraction and catalytic oxidation desulfurization system was studied using H2O2 as an oxidant and a deep eutectic solvent (DES) as an extractant. Using the 43.06%-SiW12@ZIF-67 composite under optimal reaction conditions, DBT present in a model oil could be deeply and effectively removed. The catalyst was reused 6 times, and the desulfurization rate still exceeded 90%. Finally, a possible desulfurization mechanism is proposed.
研究领域:
催化
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环境化学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）