26099-09-2Relevant articles and documents
Liquid hydrogenation of maleic anhydride with Pd/C catalyst at low pressure and temperature in batch reactor
Kim, Ji Sun,Baek, Jae Ho,Ryu, Young Bok,Hong, Seong-Soo,Lee, Man Sig
, p. 290 - 294 (2015)
Succinic acid (SA) produced from hydrogenation of maleic anhydride (MAN) is used widely in manufacturing of pharmaceuticals, agrochemicals, surfactants and detergent, green solvent and biodegradable plastic. In this study, we performed that liquid hydrogenation of MAN to SA with 5 wt% Pd supported on activated carbon (Pd/C) at low pressure and temperature. The synthesis of SA was performed in aqueous solution while varying temperature, pressure, catalytic amount and agitation speed. We confirmed that the composition of the products consisting of SA, maleic acid (MA), fumaric acid (FA) and malic acid (MLA) depends on the process. The catalytic characteristics were analyzed by TGA, TEM.
Catalyst for catalytic oxidation of furfural to prepare maleic acid and application thereof
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Page/Page column 10-12, (2022/02/10)
A catalyst for catalytic oxidation of furfural to prepare maleic acid, relating to the technical field of renewable energy. The catalyst is a mixture of a bromide and a base. A method for preparing the catalyst in catalytic oxidation of furfural to prepare maleic acid. The method includes: mixing the furfural, the bromide-base, an oxidant and a solvent to carry out a reaction to obtain the maleic acid. The present invention has the advantages that the method has a relatively high conversion rate of furfural and a relatively high yield of maleic acid, the conversion rate of furfural is up to 99%, the yield of maleic acid is up to 68.04%; and the catalyst has a high catalytic selectivity and reusability.
Ordered mesoporous carbon as an efficient heterogeneous catalyst to activate peroxydisulfate for degradation of sulfadiazine
Cao, Di,Chen, Fan,Cheng, Hao,Huang, Cong,Li, Zhi-Ling,Liang, Bin,Nan, Jun,Sun, Kai,Wang, Ai-Jie
supporting information, (2022/01/26)
Catalytic potential of carbon nanomaterials in peroxydisulfate (PDS) advanced oxidation systems for degradation of antibiotics remains poorly understood. This study revealed ordered mesoporous carbon (type CMK) acted as a superior catalyst for heterogeneous degradation of sulfadiazine (SDZ) in PDS system, with a first-order reaction kinetic constant (k) and total organic carbon (TOC) mineralization efficiency of 0.06 min?1 and 59.67% ± 3.4% within 60 min, respectively. CMK catalyzed PDS system exhibited high degradation efficiencies of five other sulfonamides and three other types of antibiotics, verifying the broad-degradation capacity of antibiotics. Under neutral pH conditions, the optimal catalytic parameters were an initial SDZ concentration of 44.0 mg/L, CMK dosage of 0.07 g/L, and PDS dosage of 5.44 mmol/L, respectively. X-ray photoelectron spectroscopy and Raman spectrum analysis confirmed that the defect structure at edge of CMK and oxygen-containing functional groups on surface of CMK were major active sites, contributing to the high catalytic activity. Free radical quenching analysis revealed that both SO4?? and ?OH were generated and participated in catalytic reaction. In addition, direct electron transfer by CMK to activate PDS also occurred, further promoting catalytic performance. Configuration of SDZ molecule was optimized using density functional theory, and the possible reaction sites in SDZ molecule were calculated using Fukui function. Combining ultra-high-performance liquid chromatography (UPLC)–mass spectrometry (MS)/MS analysis, three potential degradation pathways were proposed, including the direct removal of SO2 molecules, the 14S-17 N fracture, and the 19C-20 N and 19C-27 N cleavage of the SDZ molecule. The study demonstrated that ordered mesoporous carbon could work as a feasible catalytic material for PDS advanced oxidation during removal of antibiotics from wastewater.
Electrochemical Strategy for the Simultaneous Production of Cyclohexanone and Benzoquinone by the Reaction of Phenol and Water
Wu, Ruizhi,Meng, Qinglei,Yan, Jiang,Liu, Huizhen,Zhu, Qinggong,Zheng, Lirong,Zhang, Jing,Han, Buxing
, p. 1556 - 1571 (2022/02/01)
Cyclohexanone and benzoquinone are important chemicals in chemical and manufacturing industries. The simultaneous production of cyclohexanone and benzoquinone by the reaction of phenol and water is an ideal route for the economical production of the two c
Direct catalytic benzene hydroxylation under mild reaction conditions by using a monocationic μ-nitrido-bridged iron phthalocyanine dimer with 16 peripheral methyl groups
Tanaka, Kentaro,Teoh, Chee-Ming,Toyoda, Yuka,Yamada, Yasuyuki
supporting information, p. 955 - 958 (2022/02/07)
Direct catalytic hydroxylation of benzene under mild reaction conditions proceeded efficiently in the presence of a monocationic μ-nitrido-bridged iron phthalocyanine dimer with 16 peripheral methyl groups in an acetonitrile solution with excess H2O2. Mechanistic studies suggested that the reaction was catalyzed by a high-valent iron-oxo species generated in situ. Moreover, the peripheral methyl groups of the catalyst were presumed to have enhanced the production rate of the iron-oxo species.
Robust selenium-doped carbon nitride nanotubes for selective electrocatalytic oxidation of furan compounds to maleic acid
Huang, Xin,Song, Jinliang,Hua, Manli,Chen, Bingfeng,Xie, Zhenbing,Liu, Huizhen,Zhang, Zhanrong,Meng, Qinglei,Han, Buxing
, p. 6342 - 6349 (2021/05/19)
Selective oxidation of biomass-derived furan compounds to maleic acid (MA), an important bulk chemical, is a very attractive strategy for biomass transformation. However, achieving a high MA selectivity remains a great challenge. Herein, we for the first time successfully designed and fabricated Se-doped graphitic carbon nitride nanotubes with a chemical formula of C3.0N-Se0.03. The prepared C3.0N-Se0.03 was highly efficient for electrocatalytic oxidation of various biomass-derived furan compounds to generate MA. At ambient conditions, the MA yield could reach 84.2% from the electro-oxidation of furfural. Notably, the substituents on the furan ring significantly affected the selectivity to MA, following the order: carboxyl group > aldehyde group > hydroxyl group. Detailed investigation revealed that Se doping could tune the chemical structure of the materials (e.g., C3.0N-Se0.03 and g-C3N4), thus resulting in the change in catalytic mechanism. The excellent performance of C3.0N-Se0.03 originated from the suitable amount of graphitic N and its better electrochemical properties, which significantly boosted the oxidation pathway to MA. This work provides a robust and selective metal-free electrocatalyst for the sustainable synthesis of MA from oxidation of biomass-derived furan compounds. This journal is
The effect of Br- and alkali in enhancing the oxidation of furfural to maleic acid with hydrogen peroxide
Yang, Tao,Li, Wenzhi,Ogunbiyi, Ajibola T.
, (2021/03/06)
This study was focused on investigating a novel catalytic system for the selective conversion of furfural to maleic acid (MA) in an aqueous system with hydrogen peroxide as an oxidant. A series of experiments that study the impacts of catalyst species, furfural concentration, catalyst dosage, reaction temperature, residue time, hydrogen peroxide concentration, excess water content, and solvent types on the oxidation of furfural to MA was carried out. The results showed that the co-existence of Br- and alkali sites might play a vital role in furfural oxidation, which could improve the MA yield remarkably. Under 90 °C for 3 h, 72.4 % MA yield was obtained with KOH and KBr as co-catalyst in an aqueous phase. Moreover, a possible reaction pathway of furfural oxidation was proposed on the basis of our reaction system.
Biosynthesis ofl-alanine fromcis-butenedioic anhydride catalyzed by a triple-enzyme cascadeviaa genetically modified strain
Cui, Ruizhi,Liu, Zhongmei,Yu, Puyi,Zhou, Li,Zhou, Zhemin
, p. 7290 - 7298 (2021/09/28)
In industry,l-alanine is biosynthesized using fermentation methods or catalyzed froml-aspartic acid by aspartate β-decarboxylase (ASD). In this study, a triple-enzyme system was developed to biosynthesizel-alanine fromcis-butenedioic anhydride, which was cost-efficient and could overcome the shortcomings of fermentation. Maleic acid formed bycis-butenedioic anhydride dissolving in water was transformed tol-alanineviafumaric acid andl-asparagic acid catalyzed by maleate isomerase (MaiA), aspartase (AspA) and ASD, respectively. The enzymatic properties of ASD from different origins were investigated and compared, as ASD was the key enzyme of the triple-enzyme cascade. Based on cofactor dependence and cooperation with the other two enzymes, a suitable ASD was chosen. Two of the three enzymes, MaiA and ASD, were recombinant enzymes cloned into a dual-promoter plasmid for overexpression; another enzyme, AspA, was the genomic enzyme of the host cell, in which AspA was enhanced by a T7promoter. Two fumarases in the host cell genome were deleted to improve the utilization of the intermediate fumaric acid. The conversion of whole-cell catalysis achieved 94.9% in 6 h, and the productivity given in our system was 28.2 g (L h)?1, which was higher than the productivity that had been reported. A catalysis-extraction circulation process for the synthesis ofl-alanine was established based on high-density fermentation, and the wastewater generated by this process was less than 34% of that by the fermentation process. Our results not only established a new green manufacturing process forl-alanine production fromcis-butenedioic anhydride but also provided a promising strategy that could consider both catalytic ability and cell growth burden for multi-enzyme cascade catalysis.
Effect of CTAB on the Oxidation of Furfural to Maleic Acid over Hierarchical CoAPO-5 Catalysts
Zheng, Lijie,Sun, Xueni,Wang, Jun,Lu, Yang,Shao, Hui
, p. 237 - 244 (2021/04/09)
A series of hierarchical CoAPO-5 molecular sieves was hydrothermally prepared using cetyltrimethylammonium bromide (CTAB) as the template. The structural properties of CoAPO-5 molecular sieves with different amount of CTAB, including AFI-0.10, AFI-0.25, AFI-0.35, AFI-0.45 and AFI-0.55 were all characterized by XRD, SEM, N2 adsorption-desorption and NH3-TPD. The catalytic performance of as-prepared CoAPO-5 molecular sieves for the oxidation of furfural to maleic acid was evaluated. Research results indicated that the structure characteristics as well as the catalytic performances of CoAPO-5 molecular sieves were strongly influenced by CTAB concentration. Among those hierarchical CoAPO-5 catalysts, AFI-0.45 sample demonstrated highest maleic acid yield of 85.9% at 60℃ after 3 hr reaction. Also, the stability of AFI-0.45 was proved persistent for subsequent cycles.
A biomass-derived metal-free catalyst doped with phosphorus for highly efficient and selective oxidation of furfural into maleic acid
Zhang, Huifa,Wang, Shaolin,Zhang, Huixian,Clark, James H.,Cao, Fahai
, p. 1370 - 1381 (2021/02/26)
The present work introduces an extremely simple and eco-friendly strategy for the highly selective synthesis of maleic acid (MA)viaoxidation of renewable furfural using the abundant biomass-derived P-C-Tcatalyst. The P-C-Tcarbon catalyst was metal-free and prepared by the pyrolyzation of phytic acid, which is a ubiquitous natural molecule containing phosphorus. Extensive characterization was carried out to reveal the morphological and elemental properties of the synthesized P-C-Tseries. The effect of the annealing temperature of pyrolyzing phytic acid on the properties of the yielded P-C-Tand subsequent catalytic performance was also explored. The catalytic oxidation of furfural to MA was carried out in the presence of H2O2within an aqueous system. The reaction conditions including the catalyst loading, H2O2concentration, reaction temperature and duration were further optimized. It was found that P-C-600 exhibited a remarkable catalytic activity for MA synthesis from furfural oxidation with a maximum yield of 76.3% achieved in water. The excellent catalytic performance of P-C-600 was attributed to its unique atomic layered structure and suitable acidity. P-C-600 could also be re-used for at least six runs without any obvious decrease in its catalytic performance. The intrinsic advantages of green synthesis, low cost, and excellent catalytic performance in the catalytic oxidation of furfural to MA suggested that P-C-600 would be a promising catalyst in future industrial applications for MA synthesis in a green manner.
