CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Hao Wang,Libin Ji,Liang Li,Xiaorong Guo,Haitao Li,Yin Zhang,Jun Ren,Chenghua Zhang,Yongxiang Zhao
The hydrogenation of maleic anhydride (MA) to succinic anhydride (SA) is a highly selectivity-sensitive reaction, significantly influenced by catalyst activity and temperature. Excessive hydrogenation often leads to the formation of other byproducts and the decreasing of SA selectivity. A key industrial challenge lies in achieving both high MA conversion and SA selectivity under industrial operating conditions. In this paper, a confined metal Ni catalyst anchored on mordenite (MOR) zeolite was prepared by a simple and low-cost method, and its acidity was regulated by alkali metal ion. The results show that compared with SiO 2 and Al 2 O 3 as supports, the Ni/MOR catalyst achieves an excellent MA conversion of about 100 %, and a remarkable SA selectivity up to 99 %. Meanwhile, the stability of the Ni/MOR catalyst has been significantly improved. With the similar conversion rate of MA, the reaction cycle numbers of Ni/MOR are twice that of the traditional Ni/SiO 2 catalyst. This is attributed to the confinement effect of the MOR channels, which slightly reduces the activity of the metal and then effectively inhibits the over‑hydrogenation process of SA. In addition, a combination of theoretical calculation and experimental characterization was used to deeply study the reaction mechanism of high-selective hydrogenation of MA to SA.
研究领域:
催化化学
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化学反应工程
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工业化学
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材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Cheng Zhang,Hongyi Qi,Tianxiao Chang,Yahe Wu,Jiacheng Cao,Mingsen Chen,Yanbin Huang,Wantai Yang
Maleic anhydride (MAH) copolymers have a wide range of applications in various fields. However, the difficulty in obtaining high-molecular-weight (Mw) copolymers through polymerization often limits their potential for application expansion. In this paper, diols were chosen as chain extenders to increase the Mw of MAH copolymers through esterification reactions between anhydride and alcohol, achieving the goal of “chain extension”. As the reaction progressed, the double-end esterification content (DEC) increased and the Mw showed exponential growth accompanied by an increase in gel content. The effects of various reaction parameters, including the temperature, reaction time, types and amounts of diols, polymer concentration, and Mw of raw polymer, on the Mw and gel content of the product were investigated systematically. Furthermore, this method can effectively increase the Mw of various mixed olefin–MAH copolymers. The experimental results demonstrated that the Mw of raw polymers could be increased by up to 70 times (from 18.0 to 1270.8 kg/mol), thereby broadening the polymers’ potential applications.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiao Chen,Nannan Zhang,Huaming Wang,Ying Zhong,Tianming Lv,Changhai Liang
The continuous flow selective hydrogenation of maleic anhydride (MA) to γ-butyrolactone (GBL) over highly efficient and long-term stable catalysts is a considerable promising strategy for both lab-scale as well as industrial application. In this work, a PtPdCoNiCu/TiO 2 high-entropy alloy (HEA) catalyst is developed by the colloidal impregnation method, in which the HEA colloids are synthesized by lithium naphthalenide-driven reduction at mild conditions according to the redox potential of the various metals. The PtPdCoNiCu/TiO 2 catalyst exhibits highly efficient in the hydrogenation of MA with 91 % selectivity to GBL at full conversion of MA under the weighted hourly space velocity of 1.14 h −1 , 3 MPa H 2 , and 260 °C. Due to the present of oxygen vacancy in the TiO 2 support and the hydrogen spillover, the PtPdCoNiCu/TiO 2 HEA catalyst presents a low apparent activation energy (75 kJ mol −1 ), boosting the hydrogenolysis of C=O bonds for generating of GBL. The cocktail effect is presented in the PtPdCoNiCu/TiO 2 catalyst, and its catalytic activity is much better than that of corresponding monometallic and bimetallic catalysts. It realizes the reduction and substitution of precious metal catalysts. In addition, the PtPdCoNiCu/TiO 2 catalyst with sintering resistance and acid resistance shows excellent long-term stability within 132 h. This work is of great significance for understanding HEA catalysis at the atomic level and provides the possibility for developing low-cost and efficient precious metal industrial catalysts.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Dongdong Kang,Huiju Shao,Guijing Chen,Xiaoliang Dong,Shuhao Qin
Amphiphilic copolymers have increasingly attracted researchers’ attention to produce the hydrophilic and antifouling polymeric membranes. However, few studies has been reported on systematic manipulation of matrix miscibility to control the membrane microstructure during the nonsolvent induced phase separation (NIPS). Herein, a facile method is brought forward to investigate the effects of miscibility on the structure and performance of the membranes. Through the transformation of styrene-maleic anhydride copolymer (SMA) into sodium styrene-maleic anhydride copolymer (SMANa), a homogeneous and transparent dope solution was successfully prepared. Next, the crescent pores and spherical particles in the PVDF/SMA membrane were eliminated to achieve the uniformly porous PVDF/SMANa membranes by the exchange of nonsolvent and solvent components. Importantly, SMANa could segregate at the external surface and internal pore walls as SMA to enhance the hydrophilicity and antifouling properties of the membranes. Subsequently, by optimizing the dope solution composition and coagulation bath temperature, PVDF/SMANa ultrafiltration membranes exhibited the pure water flux of 1014 L/m 2 h and the rejection to BSA of 98.9%. These results outperformed previously reported ones for similar PVDF composite membranes. Significantly, this strategy can be applied to the large-scale manufacture of membranes.
研究领域:
材料科学
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膜技术
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高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF DAIRY SCIENCE
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2021
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IF 4.034
Yi Pan,Xiao-Min Li,Ran Meng,Bao Zhang
ABSTRACT The effects of maleic anhydride (MA) acylation and pullulan glycation on casein hydrolysates (CH) and the physicochemical stability of modified or unmodified CH-stabilized emulsions were explored. Compared with casein, the solubility of CH was improved, and CH 1 (hydrolysis degree 4%) exhibited the optimal emulsifying properties. After the acylation of MA, degrees of acylation (DA) increased with increasing addition of MA. Fourier-transform infrared spectroscopy revealed that a covalent bond was formed between MA and CH 1 . The results of pullulan glycation indicated that the degree of glycation decreased with increasing DA. Acylation combined with glycation effectively reduced the surface hydrophobicity of CH. Results of analysis of physicochemical stability and gastrointestinal fate of curcumin in emulsions revealed that CH modified by MA acylation and pullulan glycation played a positive role in enhancing the stability and bioaccessibility of curcumin loaded in emulsions.
研究领域:
食品科学
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化学
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营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
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2012
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IF 2.721
Yumin Wu,Guangdi Ni,Fei Yang,Chuanxian Li,Guoliang Dong
To investigate the influence of structure variables of polymeric additives on the pour-point depression and rheological behavior of waxy crude oil, maleic anhydride co-polymer and its derivatives with different polar and/or aromatic pendant chains were designed and synthesized. All prepared additives were characterized by Fourier transform infrared (FTIR) spectroscopy and gel permeation chromatography (GPC). The pour-point and rheological properties of Changqing (CQ) crude oil with a low asphaltene content before and after additive beneficiation were studied in detail. Differential scanning calorimetry (DSC) and polarizing light microscopy were employed to gain insight on the interactions between such additives and wax crystals. The results are encouraging and showed that all four polymeric additives exhibited good efficiency as flow improvers in CQ crude oil. The reduction of pour-point and rheological parameters after additive addition largely related to the polymer structure. The polymer containing aromatic units showed the best performance, which could depress the pour point by 19 °C and decrease the yield stress as well as viscosity to a large extent.
研究领域:
石油工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2018
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IF 1.333
Qiao Zhang,Jianjun Fang,Wenjuan Liu,Yunhui Zhao,Tianlong Huang,Jiale Cui,Yun Yang,Zhihua Zhou
Bone tissue engineering is sought to apply strategies for bone defects healing biodegradable porous scaffolds without limitations and shortcomings. In this work, we have developed a novel maleic anhydride (MAH) and 1,4-butanediamine modified poly(lactide-co-glycolide) polymer (BMPLGA). The synthesized polymer was characterized by Fourier transform infrared spectrometry (FTIR), Nuclear magnetic resonance spectra (1H NMR), gel permeation chromatography (GPC) and contact angle measurements. In addition, cell morphologies in the extracts and cell cytotoxity were also studied. The results showed that the BMPLGA was successfully obtained by introducing MAH and 1,4-butanediamine into PLGA in bulk. The introduction of anhydride and amino groups improved the hydrophilicity of PLGA. Fibroblastic cells showed normal morphologies in BMPLGA extracts, and the BMPLGA materials showed no cell cytotoxicity. The synthetic BMPLGA material may have potentials for biomedical applications due to improving hydrophilicity.
研究领域:
生物材料学
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医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2022
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IF 8.047
Haoyu Li,Pengfei Wu,Xianquan Li,Jifeng Pang,Shangru Zhai,Tao Zhang,Mingyuan Zheng
High-performance MFI zeolite supported nickel catalysts were prepared by the ammonia evaporation method for maleic anhydride (MA) conversion to γ-butyrolactone (GBL). According to comprehensive characterizations, the Ni catalysts possessed petal-like morphology and hierarchical structures with meso and micro pores. Nickel species were highly dispersed on the silica support and generated abundant Lewis acid sites (LAS), which effectively activated carbonyl groups in the reactant and accounted for the high activity in MA hydrogenation. Zr species hydrothermally introduced into the catalyst increased the number of LAS and decreased the apparent activation energy for the reaction. The highest GBL yield reached 95.6% over 40Ni-2Zr-MFI with the assistance of 3A zeolite to in-situ remove water byproduct. The catalyst showed reasonably good stability in five-cycle operation thanks to the strong interaction between Ni and support. The reaction route for MA hydrogenation was investigated, in which succinic anhydride (SA-A) served as the major reaction intermediate for GBL formation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2022
·
IF 12.781
Muhammad Faizan,Yingwei Li,Xingsheng Wang,Piao Song,Ruirui Zhang,Ruixia Liu
Deep eutectic solvents (DESs) are now considered a new class of ionic liquid analogs that have been generously used in various fields. Herein, vanadium phosphorus oxide (VPO) catalysts are synthesized in combination with a deep eutectic solvent containing rare earth metal (rE-DES), and their catalytic performance in n-butane selective oxidation to produce maleic anhydride (MA) is evaluated. The rE-DES is produced from the interaction of choline chloride (ChCl) and rare earth metal salts (Cerium, Europium, Lanthanum, and Samarium metal salt) (ChCl:rE = 1:0.5–1:3) under mild conditions. It was found that DESs served as structural modifiers and electronic promoters during VPO synthesis. It regulated the chemical state of the catalyst surface, such as the vanadium valence state, acid-base properties, and ratios of V 4+ /V 5+ , Lat–O/Sur–O and P/V. Various characterization techniques, such as FT-IR, DSC, XRD, SEM, EDS, TEM, Raman, TGA, NH 3 -TPD, and XPS, were used to examine its physical and chemical characteristics. These characteristics were correlated with the catalytic performance. The VPO catalyst modified by rE-DES showed a significant enhancement of n-butane conversion and MA selectivity while suppressing the selectivity of CO and CO 2 as well as the CO/CO 2 ratio compared to the unpromoted VPO catalyst. Especially for Ce-DES-VPO, it increased the n-butane conversion and MA mass yield up to approximately 11% and 10%, respectively. In addition, we evaluated the catalytic performance under different activation atmospheres.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Haoran Tian,Zhifei Zhu,Feng Ma,Junying Li,Jian Li,Yingzhou Li,Pengfei Yang
The treatment of dye pollutants in wastewater was a serious environmental issue. In this paper, freezing radical polymerization was used to prepare poly (polyethylene gly co l diacrylate - co - maleic anhydride) (p(PEGDA- co -MA)) cryogels with redox initiators of ammonium persulfate / tetramethylethylene diamine in aqueous solution. The mechanical property and chemical structure of cryogels were characterized compression tests, IR, and XPS. After that, adsorption performance of p(PEGDA- co -MA) cryogels for cationic dyes was measured and the maximum adsorption capacity for methylene blue and crystal violet was 447.7 mg·g −1 and 329.5 mg·g −1 (pH = 7.0), respectively. Adsorption isotherm , adsorption kinetics and adsorption thermodynamics were investigated to reveal adsorption mechanism of cryogel materials, which showed that monolayer chemical adsorption was dominant and the adsorption capacity decreased with the increase of temperature. This p(PEGDA- co -MA) cryogels would not only partly developed the polymerization method of vinyl monomers but also strongly expanded the field of dye adsorption materials.
研究领域:
环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Kaihui Pan,Zexin Zhang,Yang Liu,Yihao Wang,Li Wang,Wantai Yang
In this study, poly(ethylene-alt-maleic anhydride) (PEMA) was selected as the backbone, and PEMA-g-DA/DMAPA was synthesized through an amidation reaction with dopamine (DA) and N,N-dimethylaminopropylamine (DMAPA). The antifogging performance, stability, universality, and antibacterial property after quaternization of the PEMA-DA-DMAPA coating were tested and analyzed. Experimental results showed that the PEMA-DA-DMAPA coating exhibited great antifogging performance, with the water contact angle (WCA) as low as 10.7°. The coefficient of friction of the PEMA-DA-DMAPA coating decreased significantly compared with that of the substrate. Even after 5 days of immersion or 60 cycling tests, the coating still maintained excellent antifogging properties. This coating can be widely applied to the surfaces of transparent substrates, such as poly(methyl methacrylate)(PMMA), polyethylene terephthalate (PET), and polycarbonate (PC). Specifically, the WCA on the PC surface dropped significantly from 89.5° to 11.9°. After quaternization, the coating exhibited notable antibacterial activity against Staphylococcus aureus (S. aureus), with a maximum antibacterial rate of 97.23%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Shuai Luo,Xiao-Xi Peng,Yun-Fei Zhang,Ping Fu,Fei-Peng Du
In order to improve the oil-repellent and antifouling ability of the antifog coatings, a poly(vinyl alcohol)/hydrolyzed poly (styrene-co-maleic anhydride)/fluorocarbon surfactant (PVA/H-PSMA/FC) was prepared by incorporating a fluorocarbon surfactant into PVA/H-PSMA via hydrogen bonds. The microstructure, antifog and oil-repellent properties were investigated in our study, and the results indicate that the strong interaction between the PVA/H-PSMA and the FC provides a good fixation for the FC inside or on the surface of the coatings. The water contact angle (WCA) ranges from 59° to 69° and the oil contact angle (OCA) ranges from 35° to 50°, which means that the PVA/H-PSMA/FC coatings are hydrophilic and oleophilic. The results also demonstrate that the prepared PVA/H-PSMA/FC coating exhibits excellent antifog properties and high transparency. Moreover, the oil droplets may slip off the coating surface without any residue and the glide angle is below 12°. A low content of FC loaded creates a large space between FC molecules, thus providing enough hydrophilicity on the PVA/H-PSMA surface and achieving excellent antifog performance. Meanwhile, the mobile fluorinated alkyl chains on the surface can be reorganized and act as “slides” to easily move oil droplets at low TA, providing oil repellency. The excellent oil-repellency makes the transparent PVA/H-PSMA/FC antifog coatings have potential application prospects in the field of surface protection of optical equipment and solar panel.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）