Polymers
·
2024
·Vol. 16
·期 8
·1115
·
IF 4.7
Zhigong Zheng,Ronghui Shi,Xiaoping Zhang,Yonghao Ni,Hui Zhang
Tetracycline (TC) is a common antibiotic; when untreated TC enters the environment, it will cause a negative impact on the human body through the food chain. In the present study, MnO2/MCM-41@Fe3O4(FeMnMCM) prepared using a hydrothermal and redox method andCamellia oleiferashell-activated carbon (COFAC) prepared through alkali activation were encapsulated using alginate (ALG) and calcium chloride as a cross-linking matrix to give the composite beads COFAC–FeMnMCM–ALG. The resultant COFAC–FeMnMCM–ALG composite beads were then carefully characterized, showing a high immobilization of MnO2/MCM-41@Fe3O4, with porous COFAC as an effective bioadsorbent for enriching the pollutants in the treated samples. These bead catalysts were subsequently applied to the oxidative degradation of TC in a Fenton oxidation system. Several parameters affecting the degradation were investigated, including the H2O2concentration, catalyst dosage, initial TC concentration, and temperature. A very high catalytic activity towards the degradation of TC was demonstrated. The electron paramagnetic resonance (EPR) and quenching results showed that ·OH and ·O2−were generated in the system, with ·OH as the main radical species. In addition, the COFAC–FeMnMCM–ALG catalyst exhibited excellent recyclability/reusability. We conclude that the as-prepared COFAC–FeMnMCM–ALG composite beads, which integrate MnO2and Fe3O4with bioadsorbents, provide a new idea for the design of catalysts for advanced oxidation processes (AOPs) and have great potential in the Fenton oxidation system to degrade toxic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Hongxia Zhang,Qiaoting Niu,Yahang Mou,Zhihao Bian,Tianle Zhang,Changqing Chu,Dezhi Han,Fang Wang,Guangjian Wang,Liancheng Bing
Catalytic hydrolysis of ammonia borane (NH 3 BH 3 , AB) is considered to be a promising, secure and effective route for hydrogen generation on-demand. Developing highly efficient catalysts for hydrogen production from AB hydrolysis is of considerable important but remains a huge challenge. Herein, a series of bimetal PtNi nanoparticles (NPs) were immobilized on mesoporous MCM-41 via a facile impregnation-reduction method. Attributing to the regular pore channel and high surface area of the mesoporous zeolite support as well as the structural property of PtNi alloys and the synergistic effect between Pt and Ni atoms, the Pt 0.4 Ni 0.6 /MCM-41 catalyst exhibits superb catalytic activity towards hydrogen generation from AB hydrolysis. The turnover frequency (TOF) value reaches 939 mol H2 (mol Pt ∙min) −1 at 298 K, which is more than 3 times higher than that of monometallic Pt/MCM-41. In addition, the Pt 0.4 Ni 0.6 /MCM-41 catalyst exhibits superior catalytic performance in tandem hydrogenation of 4-nitrophenol by coupling with hydrolytic dehydrogenation of AB.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Kaixuan Yan,Xin Song,Chunliang Zhou,Junnan Liu,Rongji Cui,Panting Gao,Zhicheng Tang
The presence of sulfur-containing impurities in natural gas not only diminishes its utilization value, but also results in the emission of sulfur-containing pollutants. In this study, a Cu-Ce bimetallic-loaded MCM-41 catalyst was prepared by ammonia evaporation method for the catalytic hydrolysis of carbonyl sulfide (COS). The desulfurization efficiency of Cu 25 Ce 5 /MCM-41 can reach a 100 % COS removal rate and maintain for 3.5 h. CuO furnishes the predominant weakly acidic and weakly basic sites for the desulfurization process, which are conducive to the adsorption of COS. Meanwhile, CeOx provides a greater abundance of moderately basic sites for the desulfurization process, which help to improve the removal efficiency of COS. The incorporation of Ce into the catalyst enhances the resistance to sulfur poisoning of Cu and prolongs the lifespan of the catalyst. The incorporation of Ce is capable of transforming the strongly basic sites on the surface of Cu 25 /MCM-41 into moderately basic sites, avoiding excessive oxidation of H 2 S. Additionally, the introduction of Ce offers a degree of protection for CuO, which improves the ability of the catalyst to resist sulfur poisoning. The combined effect of Cu and Ce was found to be instrumental in enhancing the adsorption of COS and in slowing down the oxidation of H 2 S. The reduction of Cu 2+ and Ce 3+ indicated their direct participation in the oxidation of H 2 S. Firstly, COS adsorbed on the catalyst surface is converted into H 2 S and CO 2 through a catalytic hydrolysis reaction. Subsequently, H 2 S adsorbed on the catalyst surface undergoes partial oxidation to sulfide, and partial further oxidation by oxygen-containing functional groups on the surface to S, SO 3 2- , and SO 4 2- , which results in the toxic deactivation of the catalyst.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 19
·11448-11462
·
IF 10.7
Jean Damascene Ndayambaje,Irfan Shabbir,Li Dong,Qian Su,Weiguo Cheng
The conversion of carbon dioxide (CO2) into valuable industrial materials effectively combats rising emissions and facilitates carbon recycling, which requires a top-tier catalyst. In this study, a series of dicationic pyrazolium ionic liquids were grafted onto pre-functionalized MCM-41, and the resulting CnPz–APTES/MCM-41 (n = 3–6), which integrate hydrogen bond donors, Lewis basic tertiary amines (dual N+ sites), nucleophilic ionic sites, high surface areas, and mesoporous structures, were employed as catalysts in the cycloaddition of CO2 and epoxides to yield cyclic carbonates. Among them, C6Pz–APTES/MCM-41 exhibited excellent catalytic performance achieving 98.2% PC yield and 100% selectivity under mild reaction conditions (70 °C and 0.5 MPa CO2 pressure) without a metal, co-catalyst, or solvent. The effect of reaction parameters on the production of cyclic carbonates was thoroughly investigated. Furthermore, C6Pz–APTES/MCM-41 could be efficiently recovered and reused six times without loss of its catalytic activity. It also showed significant adaptability to different epoxides. Structure–activity studies indicated that PO activation was synergistically promoted by the presence of C3/C5 hydrogens from dicationic pyrazolium rings bound by alkyl linkers and dibromide ions in CnPz–APTES/MCM-41. Finally, the reaction mechanism was further investigated using X-ray photoelectron spectroscopy (XPS), proton nuclear magnetic resonance (1H NMR), and density functional theory (DFT) computations.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Zhan-Jun Zhu,Zhen-Hong He,Sen-Wang Wang,Bao-Ting Wu,Yue Tian,Yong-Chang Sun,Kuan Wang,Weitao Wang,Huan Wang,Zhao-Tie Liu
Compared with conventional thermal catalysis reaction, the photothermal CO 2 -assisted oxidative dehydrogenation of propane (CO 2 -ODHP) to produce propylene and CO is an environmentally friendly and sustainable method that operates at lower temperatures. In the present work, we have developed a series of Co-Mn/MCM-41 catalysts and utilized them in the photothermal CO 2 -ODHP reaction. Among these catalysts, the sample with Co and Mn loadings of 3 % resulted in activities of 225.7 μmol g cat −1 h −1 of propylene and 272.0 μmol g cat −1 h −1 of CO at 250 °C. Characterization results revealed that the electron transfer and interplay between Co and Mn oxides enhance the photoelectronic response and reduce impedance, facilitating the electron transfer process. Besides, the Co and Mn bimetallic species could enhance photothermal conversion efficiency and further enhance the local temperature during the reaction. The present work introduces a novel strategy for building supported bimetallic oxides in achieving CO 2 -ODHP via the photothermal route and is also expected to provide an optional catalyst required satisfactions including efficient electron transfer and photothermal conversion for other photothermal reactions.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 11
·1739-1748
·
IF 1.852
Wenwen Yuan,Yi Huang,Chunyan Wu,Xiang Liu,Yongmei Xia,Haijun Wang
The development of novel methods to obtain biofuels and chemicals from biomass has been an immediate issue in both academic and industrial communities. In this work, a series of novel catalysts were prepared and characterized by FT-IR, TGA, XRD, SEM, TEM, ICP-AES, NH 3 -TPD and BET, which were applied for the conversion of hexose to 5-hydroxymethylfurfural (HMF). The Cr(Salten)-MCM-41-[(CH 2 ) 3 SO 3 HVIm]HSO 4 catalyst was the most active catalyst, and a glucose conversion of 99.8% with 50.2% HMF yield was obtained at 140 °C for 4 h in dimethyl sulfoxide (DMSO). The effects of reaction temperature, reaction time, solvents and catalyst dosages were investigated in detail. MCM-41 immobilized acidic functional ionic liquid and chromium(III) Schiff base complexes as heterogeneous catalysts can be easily recovered by simple filter treatment, exhibiting excellent stability and activity towards hexose conversion. Thus the heterogeneous catalysts were environment-friendly for transforming biomass carbohydrates into fine chemicals.
研究领域:
化学工程
·
生物质能
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Baogang Su,Hui Pan,Linbo Li,Linjun Shao,Chenze Qi,Shujing Zhou,Jinjing Li
Design and preparation of highly active and stable supported palladium catalysts have garnered increased attention for their easy separation and reusability. Herein, MCM-41 mesoporous materials functionalized by four different amino functional groups were synthesized by using four commercially available siloxanes and then used to support palladium catalysts. The Fourier transform infrared spectroscopy (FT-IR) was used to analyze the chemical structures of functionalized MCM-41 supports. The thermogravimetric analysis (TGA) and element analysis (EA) were employed to determine the grafting densities of functional groups on MCM-41 supports. The mesoporous structures of functionalized MCM-41 supports and dispersion of palladium species were characterized by high resolution transmission electron microscopy (TEM) and X-ray diffraction patterns (XRD). A study of the materials using positron annihilation lifetime spectroscopy (PALS) reveals the different ortho-positronium ( o -Ps) annihilation properties of the supported palladium species on the four supports. Meanwhile, the catalytic activities of supported palladium species on the four supports were evaluated by the Heck reactions of iodobenzene with n-butyl acrylate. At last, the annihilation properties of the supported palladium species on the four supports were successfully correlated with their catalytic activities. The result suggests a facile method to determine and predict the catalytic activities of supported palladium species by using PALS, which may hold great potential in the preparation of rationally designed and highly active supported palladium catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Guojun Lv,Xuyang Zou,Yan Chen,Qing Zhang,Xubin Zhang,Fumin Wang
The successful one-pot synthesis of MCM-41/MFI composite is mainly concentrated on the trivalent heteroatom of Al 3+ and Fe 3+ , however there are almost no reports about the one-pot synthesis of Ti-MCM-41/MFI composite. In this work, we reported the one-pot synthesis of Ti-MCM-41/MFI composite with a temperature-gradient hydrothermal strategy using hexadecyl trimethylammonium bromide CTAB and silicalite-1 seed as structure directing agents as well as ammonia solution as alkali source, and its application as heterogeneous catalyst in the cyclohexene epoxidation reactions. The impact of Si/Ti molar ratio and ammonia dosage as well as CTAB amount on the formation and property of Ti-MCM-41/MFI composite were systematically investigated. In addition, a possible partial transformation mechanism of Ti-MCM-41/MFI composite sample was proposed. The synthesized Ti-HMZ-50-N3.77-Se0.05 sample with ordered mesoporous structure and high content of framework titanium active centers revealed the eminent cyclohexene epoxidation performance, achieving a 32.51 % of cyclohexene conversion and a 61.27 % selectivity of cyclohexene oxide within 5 h of reaction.
研究领域:
催化化学
·
材料化学
·
纳米材料
·
多相催化
·
绿色化学
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Xueying Gao,Xin Yu,Lincai Peng,Liang He,Junhua Zhang
A magnetically-recoverable multifunctional catalyst (Fe 3 O 4 /ZrO 2 @MCM-41) was tailored by the impregnation of ZrO 2 supported on mesoporous MCM-41 coated Fe 3 O 4 nanoparticles, which successfully served as a monolithic catalyst for the cascade conversion of furfural (FAL) giving high yield to γ-valerolactone (GVL), a versatile platform molecule. The ordered hexagonal framework of the parent MCM-41 well reserved after the embedding of Fe 3 O 4 and ZrO 2 . The incorporation of Fe 3 O 4 could not only impart the catalyst with a strong magnetism, but also tune its acidity to promote GVL production. An impressive yield of 85% was accomplished straight from FAL processing with iso -propanol as a hydrogen donor and solvent. The kinetic study demonstrated higher activation energy for levulinate-to-GVL step (86.9 kJ/mol) than FAL transfer hydrogenation (35.0 kJ/mol) and subsequent alcoholysis process (51.0 kJ/mol). The catalyst could be fully recovered by an external magnetic field and showed good reusability. The sustainability of this conversion represents greatly improved by the process intensification based on one-pot reaction, magnetically-recoverable multifunctional catalyst, and mild operating conditions without using gaseous hydrogen.
研究领域:
催化化学
·
纳米材料科学
·
可再生化学
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 9
·7169-7183
·
IF 1.833
Liu Xingchen,Hu Yun,Huang Jing,Wei Chaohai
A surfactant structure-directing agent was used to synthesize a hydrophobic mesoporous material (MCM-41-d) at room temperature. As-prepared materials were characterized through X-ray diffraction (XRD) analysis, Fourier-transform infrared (FT-IR) spectroscopy, N 2 adsorption–desorption isotherm analysis, and thermogravimetry (TG). The properties of the samples for adsorption of bisphenol A (BPA) from water were also investigated in detail. The results revealed that pH affected BPA adsorption. Equilibrium and kinetic data were consistent with the Langmuir adsorption and second-order kinetic model, respectively. The adsorption capacity of MCM-41-d was considerably higher than that of MCM-41-c because of its higher hydrophobicity and more abundant adsorption sites. The maximum adsorption capacity of MCM-41-d was as high as 416.7 mg/g, indicating that MCM-41-d can serve as an efficient adsorbent to remove BPA from water.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 8
·4293-4300
·
IF 5.503
Panpan Zhang,Lihua Kang,Mingyuan Zhu,Bin Dai
In this study, the ZrP/MCM-41 catalyst was successfully synthesized by using a facile one-pot method to load zirconium phosphate (ZrP) on MCM-41. The synthesized ZrP/MCM-41 catalyst was characterized by various characterization methods. The catalyst was confirmed to have medium and strong acidic sites by ammonia temperature programmed desorption (NH3-TPD). The Zr in ZrP/MCM-41 was confirmed to be Zr4+ using X-ray photoelectron spectroscopy (XPS). The catalytic activity was evaluated during the oxidative desulfurization (ODS) process, and the optimal reaction conditions were determined, including reaction temperature and time, the catalyst dosage and O/S (H2O2/sulfur) molar ratio. Under optimal reaction conditions, the sulfur removal rate of the ODS process reached 99.9%. After the catalyst was recycled 14 times, the catalytic activity was still 94.68%. The catalyst has good catalytic activity and reusability.
研究领域:
化学工程
·
催化
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Weirui Chen,Zulin Zhang,Xukai Li,Dan Wu,Ying Xue,Laisheng Li
Fe-Cu-MCM-41/O 3 was first used as an alternative to O 3 to control disinfection by-products generation from chlorinated-disinfection of Br-containing Diclofenac. Accompanying with decrease of TOC , THMs and HAAs had an initial increase, reaching the highest at 30 min, then gradually decreased. Coupling Fe-Cu-MCM-41 with O 3 successfully enhanced TOC removal and inhibited bromate, THMs and HAAs formation in post-chlorination when compared with those in ozonation . Four kinds of THMs and six kinds of HAAs were detected. CHCl 3 was main Cl-THMs and CHBrCl 2 was main Br-THMs. CHCl 2 COOH was the dominant Cl-HAAs and CHClBrCOOH was main Br-HAAs. A converse Br-THMs order was observed in O 3 and Fe-Cu-MCM-41/O 3 pre-treatment. Fe-Cu-MCM-41 decreased ozone exposure, reducing the direct reaction of O 3 with Br − to form bromate. More DBPs precursors in Fe-Cu-MCM-41/O 3 were removed by ·OH. H 2 O 2 , which generated during pre-treatment process, reduced HBrO/BrO − to Br − , inhibiting both its reaction with Br-DBPs precursors and bromate formation. The pre-treatment process changed intermediates’ properties and hydrophilic DOM was the dominant component. Hydrophobic acids and transphilic DOM were the main chlorine consuming intermediates and had major contribution to DBPs formation. Fulvic-like intermediates was suggested as precursors of Br-DBPs. Fe-Cu-MCM-41/O 3 were suggested as a good alternative to O 3 pretreatment.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）