Research on Chemical Intermediates最新文献

Enhanced efficiency of manganese molecular sieves through K2FeO4 and KMnO4 modification: optimization and mechanistic insights 通过 K2FeO4 和 KMnO4 改性提高锰分子筛的效率：优化和机理认识

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-18 DOI: 10.1007/s11164-024-05402-6

Kai Li, Yingming Guo, Yuanyuan Cao, Manman Cao

{"title":"Enhanced efficiency of manganese molecular sieves through K2FeO4 and KMnO4 modification: optimization and mechanistic insights","authors":"Kai Li, Yingming Guo, Yuanyuan Cao, Manman Cao","doi":"10.1007/s11164-024-05402-6","DOIUrl":"https://doi.org/10.1007/s11164-024-05402-6","url":null,"abstract":"Potassium permanganate (KMnO4) and potassium ferrate (K2FeO4) were used as modifiers to modify molecular sieves, and the modification periods were 35 days (KMnO4) and 27 days (K2FeO4), respectively. About 1 mol/L NaOH was used to pretreat the molecular sieves during the modification process of K2FeO4, and the modification period was further shortened to 22 days. After modification, modified molecular sieve (MMS) could effectively and continuously remove ammonium (NH4+) and manganese ions (Mn2+) from water. The adsorption kinetics showed that the adsorption of NH4+ and Mn2+ by MMS conformed to the quasi-secondary kinetic model adsorption kinetic model, and the adsorption process was mainly chemisorption. During the modification process, SEM, EDS, BET and XPS were used to investigate the structural characteristics of MMS. In the modification mechanism of molecular sieve, lattice oxygen (referred to as Oα), Mn (II), and Mn (III) accelerated the oxidation of Mn2+ to Mn4+ and promoted the rapid formation of active manganese oxide, which played a key role in shortening the modification period of MMS. This study contributes to a better understanding of the preparation and performance of MMS through a comprehensive analysis of the optimized molecular sieve modification process and the exploration of the accelerated formation mechanism of active manganese oxide.","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142254367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

BPBSBDM as an influential Brønsted acidic ionic liquid catalyst in preparing bis(pyrazolyl)methanes under mild conditions BPBSBDM 作为一种有影响力的布氏酸性离子液体催化剂，在温和条件下制备双（吡唑）甲烷

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-17 DOI: 10.1007/s11164-024-05395-2

Abdelgadir Alamin Altoum, Farag M. A. Altalbawy, Hamad AlMohamadi, Normurot Fayzullaev, Malathi Hanumanthayya, Suhaib Iqbal, Atreyi Pramanik, Abhinav Kumar, Beneen Husseen, Yasser Fakri Mustafa

{"title":"BPBSBDM as an influential Brønsted acidic ionic liquid catalyst in preparing bis(pyrazolyl)methanes under mild conditions","authors":"Abdelgadir Alamin Altoum, Farag M. A. Altalbawy, Hamad AlMohamadi, Normurot Fayzullaev, Malathi Hanumanthayya, Suhaib Iqbal, Atreyi Pramanik, Abhinav Kumar, Beneen Husseen, Yasser Fakri Mustafa","doi":"10.1007/s11164-024-05395-2","DOIUrl":"https://doi.org/10.1007/s11164-024-05395-2","url":null,"abstract":"At first, 1,4-Bis(pyridinium bi-sulfonic acid)benzene dimethylsulfonate (BPBSBDM), as a new Brønsted acidic ionic liquid (BAIL), is efficiently synthesized and revealed utilizing FT-IR (Fourier-transform infrared spectroscopy), TGA (thermogravimetric analysis), 13C NMR, 1H NMR and Mass data. Subsequently, its catalytic activity was studied in preparing bis(pyrazolyl)methane derivatives through the one-pot multicomponent coupled domino reactions (MCDRs) among 1 mmol aldehydes (aryl, heteroaryl, or alkyl aldehydes), 2 mmol ethyl acetoacetate, and 2 mmol phenylhydrazine/hydrazine hydrate under optimal conditions (50 °C, solvent-free, and 4 mol% of BPBSBDM) in high yields (89–98%), and in short times (2–7 min). Our protocol has the advantages of reasonable turnover number (TON: 22.25 to 24.50) and turnover frequency (TOF: 3.17 to 12.25 min−1) values, high yields of products, non-metallic nature of the catalyst, short reaction times, eco-friendly and economy, easy recyclability and good reproducibility. In addition, three derivatives 8a, 9a and 10a were synthesized and fully identified for the first time.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142254365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Process optimization of 1-cyanocyclohexaneacetic acid hydrogenation using response surface methodology 利用响应面方法优化 1-氰基环己烷乙酸氢化工艺

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-17 DOI: 10.1007/s11164-024-05400-8

Neng Xiong, Lin-Li Jiang, Jia-Yu Chen, Lei Lin, Jin-Rong Huang, Qi Shen, Ya-Ping Xue, Yu-Guo Zheng

{"title":"Process optimization of 1-cyanocyclohexaneacetic acid hydrogenation using response surface methodology","authors":"Neng Xiong, Lin-Li Jiang, Jia-Yu Chen, Lei Lin, Jin-Rong Huang, Qi Shen, Ya-Ping Xue, Yu-Guo Zheng","doi":"10.1007/s11164-024-05400-8","DOIUrl":"https://doi.org/10.1007/s11164-024-05400-8","url":null,"abstract":"Hydrogenation plays an important role in the production of bulk and fine chemicals. In the present work, the hydrogenation process of 1-cyanocyclohexaneacetic acid (1-CA), a key intermediate in the chemo-enzymatic synthesis of the antiepileptic drug gabapentin, was investigated. The catalysts were screened, the operating parameters for the 1-CA hydrogenation were determined by response surface methodology, and the effects of biological impurities on the reaction and catalysts were investigated. The reaction temperature, reaction solution pH and reaction time were identified as the main factors for hydrogenation by single-factor experiments. Under the optimal reaction conditions: reaction temperature 110 °C, solution pH 12.33, reaction time 3.74 h, hydrogen pressure 2 MPa and stirring speed 500 rpm, the substrate conversion reached 100%, and the total product yield reached 96.40%, which was very close to the prediction (96.88%). It was demonstrated that biological impurities greatly affect the reaction rate of hydrogenation, as well as the activity and reusability of the catalyst, in which protein impurities lead to catalyst deactivation through cumulative deposition on the catalyst surface and within the pores.","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142254364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of Co3O4-modified sulfur-doped polyimide for photocatalytic reduction of 4-nitrophenol via ion-exchange technique 通过离子交换技术合成用于光催化还原 4-硝基苯酚的 Co3O4 改性掺硫聚酰亚胺

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-16 DOI: 10.1007/s11164-024-05397-0

YunXia Xue, Hao Chen, GuoSheng Wang

{"title":"Synthesis of Co3O4-modified sulfur-doped polyimide for photocatalytic reduction of 4-nitrophenol via ion-exchange technique","authors":"YunXia Xue, Hao Chen, GuoSheng Wang","doi":"10.1007/s11164-024-05397-0","DOIUrl":"https://doi.org/10.1007/s11164-024-05397-0","url":null,"abstract":"Photocatalytic reduction of 4-nitrophenol to 4-aminophenol has a broad development prospect and potential economic value. In this study, we prepared for the first time Co3O4-modified sulfur-doped polyimide (Co3O4/SPI) catalyst using a facile ion-exchange technique. The chemical structure, morphology and photoelectronic performance of the catalysts were analyzed by different characteristics. The results showed that Co3O4 displayed high dispersibility; increasing the specific surface area of SPI provided more reactive sites. Meanwhile, the Co3O4 modification successfully constructed a Co3O4/SPI type-II heterostructure with a suitable band gap, which significantly improved the absorption of visible light and the photogenerated electron–hole pair separation efficiency of SPI. These factors caused Co3O4/SPI to exhibit higher photocatalytic activity than pure SPI, which facilitated the photocatalytic reduction of 4-nitrophenol to 4-aminophenol by Co3O4/SPI. At 5 min of visible light irradiation, the conversion of 4-nitrophenol was 100%, while that of SPI was 23%. Moreover, the photocatalyst showed good stability after five cycles. Finally, the mechanism of photocatalytic reduction of 4-nitrophenol by Co3O4/SPI was also discussed. The Co3O4/SPI provides a new approach for the cost-effective reduction of 4-nitrophenol and obtains high-value-added 4-aminophenol.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142254368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-probe sonication assisted greener approach in aqueous hydrotropic media for the synthesis of pyranopyrazole derivatives 在水性水托介质中采用超探针超声辅助绿色方法合成吡喃吡唑衍生物

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-16 DOI: 10.1007/s11164-024-05390-7

Nilam S. Dhane, Suraj R. Attar, Aboli C. Sapkal, Santosh B. Kamble, Kishor V. Gaikwad

{"title":"Ultra-probe sonication assisted greener approach in aqueous hydrotropic media for the synthesis of pyranopyrazole derivatives","authors":"Nilam S. Dhane, Suraj R. Attar, Aboli C. Sapkal, Santosh B. Kamble, Kishor V. Gaikwad","doi":"10.1007/s11164-024-05390-7","DOIUrl":"https://doi.org/10.1007/s11164-024-05390-7","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>In this study, we report a simple, green, effective, and enhanced method for synthesizing pyranopyrazole from four-component condensation of aldehyde, malononitrile, ethyl aceto-acetate, and hydrazine hydrate employing four components in one pot that is multicomponent reactions (MCRs). Multicomponent reactions carried out by using a universal solvent; water has a quality position in organic and green synthesis. By using an aqueous hydrotropic solution and ultra-probe sonication, raising the rate of reaction and getting an excellent yield are the main features of this article. Key features of the current practice include the use of non-hazardous reaction conditions, operational simplicity, and the use of cost-effective initiating substances. The pure product can be isolated easily through simple filtration, eliminating the need for column chromatography. The process yields excellent results and is time-efficient. Additionally, the hydrotrope can be recycled up to five times without significant loss of activity, making it highly beneficial for meeting industrial needs and addressing environmental concerns.<h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142254370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the selective catalytic reduction of NO by Mo/Ce combined-modified NH3 catalyst for magnetic separation of rare earth tailings 用于稀土尾矿磁分离的 Mo/Ce 组合改性 NH3 催化剂选择性催化还原 NO 的研究

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-16 DOI: 10.1007/s11164-024-05398-z

Linbo Lu, Jie Xu, Wenfei Wu, Limin Hou

{"title":"Study on the selective catalytic reduction of NO by Mo/Ce combined-modified NH3 catalyst for magnetic separation of rare earth tailings","authors":"Linbo Lu, Jie Xu, Wenfei Wu, Limin Hou","doi":"10.1007/s11164-024-05398-z","DOIUrl":"https://doi.org/10.1007/s11164-024-05398-z","url":null,"abstract":"Natural minerals as catalysts have the advantages of wide source and environmental friendliness. However, it is still challenging to develop mineral-based NH3-SCR catalysts with high NO conversion and N2 selectivity at low temperatures. Therefore, we use magnetic separation rare earth tailings with certain catalytic activity and acidic sites as the carrier, and introduce metal elements Mo and Ce with different valence states as active components to stimulate the catalytic activity of magnetic separation rare earth tailings by multi-element co-doping. The catalysts were tested and analyzed by XRD, XPS, BET, NH3-TPD and other characterization methods. The results show that there is an electronic interaction between Fe, Mo and Ce on the surface of Mo-Ce/magnetic rare earth tailings catalyst. The increase of Fe3+, Mo5+ and Ce3+ promotes the adsorption of NH3 and NO on the surface of the catalyst. With the introduction of Ce, the redox capacity and Brønsted acid strength of the catalyst at low temperature are significantly enhanced, thus accelerating the SCR reaction. The results of this study not only provide a theoretical basis for the high-value utilization of magnetic separation rare earth tailings, but also expand the raw material range of NH3-SCR denitration catalyst.","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142254369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal–organic framework-covered stainless steel mesh as a novel heterogeneous catalyst in multi-component reaction 金属有机框架包覆不锈钢网作为多组分反应中的新型异相催化剂

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-14 DOI: 10.1007/s11164-024-05384-5

Seyedeh Fatemeh Hojati, Amirhassan Amiri, Maryam Kasraeian

引用次数: 0

Efficient epoxidation of olefins by immobilized (TEMPO)-co-(Chlorophyll b)/Co(III) polymer on magnetic NPs as a bi-functional, self-co-oxidant magnetically recyclable nanocatalyst: smart isolation with poly(benzoic acid) 磁性 NPs 上固定的 (TEMPO)-co-(Chlorophyll b)/Co(III) 聚合物作为一种双功能、自氧化磁性可回收纳米催化剂高效环氧化烯烃：与聚（苯甲酸）的智能分离

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-06 DOI: 10.1007/s11164-024-05394-3

Milad Kazemnejadi, Mohsen Esmaeilpour

{"title":"Efficient epoxidation of olefins by immobilized (TEMPO)-co-(Chlorophyll b)/Co(III) polymer on magnetic NPs as a bi-functional, self-co-oxidant magnetically recyclable nanocatalyst: smart isolation with poly(benzoic acid)","authors":"Milad Kazemnejadi, Mohsen Esmaeilpour","doi":"10.1007/s11164-024-05394-3","DOIUrl":"https://doi.org/10.1007/s11164-024-05394-3","url":null,"abstract":"A selective and efficient olefin epoxidation has been developed by Fe3O4@SiO2/(TEMPO)-copolymer-(Chlorophyll b)-Co(III) NPs as a heterogeneous magnetically recyclable nanocatalyst. The nanocatalyst was synthesized through several steps including chlorophyll b de-metallation, imine functionalization with ally amine, co-polymerization with acrylated TEMPO, re-metalation with cobalt, and immobilization on magnetite NPs. Selective catalytic epoxidation of olefins was accomplished under mild conditions and in an O2 atmosphere. High selectivity and conversion were achieved for a variety of substrates. The results indicated a synergistic effect between TEMPO moieties and the coordinated Co(III) centers as two active sites. The epoxide products could be separated by the heterogeneous poly(benzoic acid) with the highest possible isolated yields. Also, the heterogeneous nanocatalyst could be recycled for at least 7 consecutive cycles with a negligible reactivity loss.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>A selective and efficient olefin epoxidation with smart isolation has been developed by Fe3O4@SiO2/(TEMPO)-copolymer-(Chlorophyll b)-Co(III) NPs under mild conditions.\u0000","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient synthesis of acetylsalicylic acid over Y-immobilized cation exchange resin conjoined ultrasonic collaborative method under mild conditions 在温和条件下通过 Y-immobilized 阳离子交换树脂结合超声波协同法高效合成乙酰水杨酸

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-03 DOI: 10.1007/s11164-024-05381-8

Jiaqi Yan, Gui Chen, Jixia Li, Sitong Wang, Yang Tan, Ye Yuan

引用次数: 0

Structures, electronic properties and dipole magnitudes of the TMWn–1O3n (TM = Mn, Fe and Co, n = 2 ~ 6) clusters TMWn-1O3n（TM = Mn、Fe 和 Co，n = 2 ~ 6）团簇的结构、电子特性和偶极幅度

IF 3.3 3区化学

Research on Chemical Intermediates Pub Date : 2024-09-02 DOI: 10.1007/s11164-024-05392-5

Zhi Li, Zi–Hao Wu, Zhen Zhao

{"title":"Structures, electronic properties and dipole magnitudes of the TMWn–1O3n (TM = Mn, Fe and Co, n = 2 ~ 6) clusters","authors":"Zhi Li, Zi–Hao Wu, Zhen Zhao","doi":"10.1007/s11164-024-05392-5","DOIUrl":"https://doi.org/10.1007/s11164-024-05392-5","url":null,"abstract":"The configurations, electronic attributes and dipole magnitudes of the TMWn–1O3n (TM = Mn, Fe and Co, n = 2 ~ 6) clusters have been calculated by using first–principles. The TM substitution significantly reduces the thermodynamic stability of tungsten oxide clusters. The position of tungsten atom substituted for the MnW4O15 clusters is different from those for the TMW4O15 (TM = Fe and Co) clusters. The MnW3O12, MnW5O18, FeWO6 and FeW5O18 clusters exhibit more kinetically stable than their neighbors. The charge transfer amounts (1.066 |e|, 1.104 |e|, 1.094 |e|, 1.138 |e| and 1.137 |e|) of the MnWn–1O3n clusters are more than those of the TMWn–1O3n (TM = F e and Co) clusters. Dipole magnitudes (1.6972 Debye, 1.342 Debye and 1.5261 Debye) of the MnW4O15, FeW3O12 and CoW3O12 clusters are larger than neighboring TMWn–1O3n clusters.","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0