FUEL
·
2020
·
IF 5.578
Wei Liu,Tenghui Li,Guojia Yu,Jiangang Wang,Zhiyong Zhou,Zhongqi Ren
Four dual-acidic deep eutectic solvents (DESs) were synthesized and investigated in an oxidative desulfurization (ODS) system using hydrogen peroxide as oxidant. l -Pyroglutamic acid/trifluoracetic acid ( l -Pyro/TFA) was further investigated as the extractant and catalyst owing to its excellent properties for removing aromatic sulfur compounds. Hydrogen bond formation by l -Pyro/TFA was confirmed using 1 H NMR and infrared spectra. The factors affecting the desulfurization efficiency, such as the DES/model oil volume ratio (V DES /V Oil ), reaction temperature, and H 2 O 2 /dibenzothiophene (DBT) molar ratio (n(H 2 O 2 )/n(DBT)), were explored. The sulfur removal rates of DBT, 4,6-dimethyldibenzothiophene, and benzothiophene were up to 99.7%, 99.6%, and 99.2%, respectively, under the optimum conditions, which were V DES /V oil = 1:20, n(H 2 O 2 )/n(DBT) = 3, and T = 60 °C. The ODS reaction followed first order kinetics through dynamic analysis. Furthermore, the desulfurization efficiency reached 98% after DES regeneration, achieved by simply washing with ultrapure water.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Jian He,Zhaozhuo Yu,Hongguo Wu,Hu Li,Song Yang
Effective synthesis of aromatic compounds from renewable biomass is highly important yet challenging. p -Cymene is an attractive aromatic compound with various promising applications in the manufacture of fine chemicals. In this study, a novel and effective catalytic system based on mesoporous tin phosphate (M-SnPO) with Lewis-Brønsted dual acidity was developed for the fast synthesis of p -cymene from the cyclodehydration of bio-based citral. Up to 78.5% yield of p -cymene was achieved from the cyclodehydration of citral at 180 °C within only 0.5 h, superior to the results reported for benchmark homogeneous acid catalysts. Characterization of as-prepared M-SnPO catalyst via various techniques indicates that the synergic effect of Lewis and Brønsted acidic sites, large pore-sized structure, and high surface area are responsible for its remarkable catalytic performance. In addition, the effectiveness of the M-SnPO catalyst could be almost sustained over multiple cycles without significant loss. The work herein is the first example of developing a Lewis-Brønsted dual acidic heterogeneous catalyst for the fast synthesis of p -cymene from the cyclodehydration of citral.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2024
·
IF 6
Ran Liu,Chang Wang,Qiang Yang,Jing-Ran Yang,Chen Liu,Liberty Mguni,Xin-Ying Liu,Ya-Li Yao,Fa-Tang Li
The development of highly active functionalized ionic liquids (ILs) as both extractants and catalysts for use in achieving deep desulfurization continues to pose challenges. In this study, a highly efficient oxidative desulfurization system was constructed, composed of dual-acidic ionic liquids (DILs) and H 2 O 2 -AcOH. The investigation results of four DILs prepared from different metal chlorides ([HSO 3 C 3 NEt 3 ]Cl-MnCl n , MnCl n = AlCl 3 , ZnCl 2 , CuCl 2 , FeCl 3 ) in oxidative desulfurization showed that [HSO 3 C 3 NEt 3 ]Cl-AlCl 3 had an outstanding catalytic effect and significantly promoted the oxidation of sulfides. With a 0.2 g [HSO 3 C 3 NEt 3 ]Cl-AlCl 3 , the removal rate of dibenzothiophene (DBT) reached 100% in 10 mL model oil under mild conditions at 55 °C for 20 min. The key is its ability to induce the dismutation of superoxide anions (•O 2 − ), which facilitates the generation of singlet oxygen ( 1 O 2 ). The efficient oxidation of DBT is accomplished through a predominantly 1 O 2 -mediated non-radical mechanism. [HSO 3 C 3 NEt 3 ]Cl-AlCl 3 serves as a favorable medium for contact to be made between 1 O 2 and sulfides, which indicates an efficient catalytic-adsorption synergy.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 16
·期 1
·103
·
IF 5
Qiao Zhou,Yuanyuan Zhao,Yafei Shi,Rongrong Zheng,Liying Guo
Utilizing triethylenediamine (DA), 1,3-propanesultone (PS), whose ring opens during the formation of the dizwiterion-intermediate DA-2PS, and the metal chlorides XCly, where X = Sn(IV), Zn(II),Al(III), Fe(III) and Mn(II), are used for the synthesis of five kinds of acidic metal-based functionalized ionic liquid catalysts ([DA-2PS][XCly]2). Their chemical structures, thermal stability and dual acidic active site were analyzed. We investigated the performance of [DA-2PS][XCly]2in catalyzing the esterification reaction between 2,5-furandicarboxylic acid (FDCA) and ethylene glycol (EG) to synthesize poly (ethylene 2,5-furandicarboxylate)(PEF). Among the catalysts tested, [DA-2PS][SnCl5]2exhibited the best catalytic performance under identical process parameters, and the optimal catalyst dosage was determined to be 0.05 mol% based on FDCA. The optimal conditions for the reaction were predicted using response surface methodology: a feed ratio of EG:FDCA = 1.96:1, an esterification temperature of 219.86 °C, a polycondensation temperature of 240.04 °C and a polycondensation time of 6.3 h, with a intrinsic viscosity of 0.67 dL·g−1. The resulting PEF was experimentally verified to exhibit an intrinsic viscosity of 0.68 dL·g−1and a number average molecular weight of 28,820 g·mol−1. Finally, the structure and thermal properties of PEF were characterized. The results confirmed that PEF possessed the correct structure, exhibited high thermal stability and demonstrated excellent thermal properties.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
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IF 2.567
Yajuan Wu,Zhen Li,Chungu Xia
The supported ionic liquids were prepared by anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto silica gel of different types. The properties of the catalysts were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectra, scanning electron microscopy (SEM), thermogravimetry/differential scanning calorimetry (TG/DSC), and X-ray photoelectron spectroscopy (XPS). The catalytic activities of both the immobilized ionic liquids and the free one (1-butylsulfonate-3-methylimidazolium bisulfate, [MIM-BS][HSO4–]) were investigated by the synthesis of polyoxymethylene dimethyl ethers (DMMn) from methylal (DMM) and trioxane (TOX), which suggested that all covalently anchored ionic liquids have better catalytic effects than [MIM-BS][HSO4–]. The optimization experiment of catalyst dosage demonstrated that the acid amount of ionic liquid is a major factor for the catalytic activity.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 33
·15901-15910
·
IF 3.925
Xiudan Zhao,Liying Guo,Tiejun Xu,Haiyue Wang,Rongrong Zheng,Zezhong Jiang
Three biacidic tin-based functional ionic liquid catalysts were prepared, including [HO3S-(CH2)3-mim]Cl-SnCl4, [HOOC-(CH2)2-mim]Cl-SnCl4, and [HO-(CH2)2-mim]Cl-SnCl4. A Fourier transform infrared (FT-IR) spectrometer, a nuclear magnetic resonance instrument (1H NMR), an X-ray diffractometer (XRD), and a thermal gravimetric analyzer (TGA) were used to test and analyze the structures, molecular structure, crystal structures, and thermal performance of the three catalysts. And investigate their performance in catalyzing the coupling reaction between ethylene carbonate (EC) and dimethyl succinate (DMSu) to synthesize poly(ethylene succinate) (PES). Orthogonal tests were performed to optimize process parameters, explore the effect of polycondensation temperature on the intrinsic viscosity number ([η]) of PES, and discuss the effect of acidic groups on catalytic performance and the mechanism of the catalytic action. An FT-IR spectrometer and a TGA were used for structural characterization and thermal performance tests on polymer PES, and biodegradability tests (enzymolysis tests) on PES. The results showed that the three biacidic tin-based functional ionic liquid catalysts prepared in this study had a satisfactory catalytic effect. Among them, the sulfonic acid imidazole tin-based ionic liquid catalyst ([HO3S-(CH2)3-mim]Cl-SnCl4) manifested the best catalytic performance. The catalytic mechanism of the biacidic tin-based ionic liquid catalysts was further explained and discussed. Under the optimal process conditions for the transesterification reaction (temperature: 227 °C; material ratio: EC : DMSu = 1; catalyst consumption: 1.0 wt%; time: 5.5 h), PES had a yield of 67.12%, a selectivity of 82.47%, and an intrinsic viscosity number of [η] = 1.052 dL g−1, and had good thermal stability and biodegradability.
研究领域:
材料科学
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催化化学
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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 BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jiashuo Chen,Zi Yu,Yongxin Liang,Guifen Feng,Tao Gan,Zuqiang Huang,Huayu Hu,Yanjuan Zhang
Exploiting cellulose-derived levulinic acid (LA) in biorefinery has potential application prospects, and the development of efficient and stable catalysts is crucial yet challenging. In this study, a bimetallic synergy strategy was proposed to construct an efficient and durable solid acid catalyst with crystalline solid solution by a totally solid-phase method. Mechanical activation (MA)-treated precursor (metal salts, starch, and urea) was calcined to obtain a stable biomass-derived carbon (BC)-supported Al Zr (MA-AZ/BC) composite, which was applied for catalytic conversion of cellulose to LA in aqueous-phase system. The results indicate that the synergistic effect of bimetallic crystalline solid solution and the existence of Brønsted–Lewis dual-acid sites in the MA-AZ/BC catalyst contributed to a cellulose conversion efficiency of 97.5 % and a LA yield of 67.1 %. Benefiting from the strong bimetal–support interaction, the MA-AZ/BC catalyst exhibited favorable stability and recoverability. On the basis of comprehensive analysis, a reaction mechanism of Brønsted–Lewis dual-acid sites for synergistic catalytic conversion of cellulose was proposed. This study provides a new idea for the rational design and environmentally friendly fabrication of functional BC-based catalysts for efficiently producing platform compounds derived from biomass.
研究领域:
催化化学
·
可再生资源利用
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）