Article
Chemistry, Physical
Sudip Dandapat, Joshi Laxmikanth Rao, Pravin R. Likhar, Soumitra Payra, Sounak Roy, Tinku Baidya
Summary: This study presents a one-step oxidation method for converting cyclohexane into adipic acid using stable oxides in an acid medium. The effect of reaction conditions on the oxidation activity has been investigated.
CATALYSIS COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Marimuthu Prabu, Marimuthu Manikandan, Pragnya Paramita Samal, Lakshmi Prasad Gurrala, Siva Prasad Mekala, Ramakrishnan Archana, Chandrani Nayak, D. Bhattacharyya, S. N. Jha, Sailaja Krishnamurty, Thirumalaiswamy Raja
Summary: The activation of C-H bonds in cyclohexane and methane is crucial for obtaining oxygenated products using nanostructured catalysts. The study identified the active sites and demonstrated the role of MnOx species and redox centers in the conversion of cyclohexane to adipic acid. The catalyst showed high recyclability and maintained its catalytic activity even after consecutive reactions. In addition, the oxidation of methane to methanol was successfully achieved without over-oxidation products.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Hao Tian, Yujun Zhang, Ziyang Zhang, Tingting Lv, Lei Bian, Hong Wang, Jianxin Li, Yusuke Yamauchi, Zhong-Li Wang
Summary: This study demonstrates a new technology to directly convert cyclohexane to adipic acid by electrocatalytic water oxidation, which generates hydroxyl radicals and achieves optimized conversion and selectivity. This provides opportunities for oxidatively converting inexpensive hydrocarbons to value-added chemicals.
Article
Electrochemistry
Hao Tian, Yujun Zhang, Di Yu, Xue Yang, Hong Wang, Christine Matindi, Zhen Yin, Hongseng Hui, Bhekie B. Mamba, Jianxin Li
Summary: In this study, a flow-through electrocatalytic membrane reactor was developed for the one-step production of adipic acid from cyclohexane. The addition of a co-oxidant significantly increased the conversion of cyclohexane and achieved the desired product.
ELECTROCHIMICA ACTA
(2022)
Editorial Material
Chemistry, Physical
Xiao Wang, Wenyi Bian, Yurong Ma, Yan Liu, Zhenzhen Wang, Chunfeng Shi, Haiping Lin, Yang Liu, Hui Huang, Zhenhui Kang
Summary: By designing carbon dots with different functional groups as catalysts, the efficient one-step oxidation of cyclohexane to adipic acid was achieved, effectively avoiding the production of nitrous oxide in traditional industrial methods. Density functional theory calculations demonstrated that a higher quantity of hydroxyl groups on the carbon dots and higher oxygen pressure can enhance the catalytic activity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Kamil Peckh, Dawid Lisicki, Ewelina Pabich, Beata Orlinska
Summary: Adipic acid is an important commercially available aliphatic dicarboxylic acid, but its production process generates nitrous oxide which is difficult to utilize. This paper proposes an alternative method using a two-stage reaction to reduce N2O production and achieve adipic acid synthesis. The method involves oxidizing cyclohexene to epoxide using hydrogen peroxide in the first stage, followed by oxidation of 1,2-cyclohexanediol with oxygen in the second stage. The use of this method can significantly reduce N2O production compared to industrial methods.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Dawid Lisicki, Beata Orlinska, Adam A. Marek, Jakub Binczak, Krzysztof Dziuba, Tomasz Martyniuk
Summary: An alternative method for synthesizing adipic acid (AA) of industrial importance has been presented. The method involves the solvent-free oxidation of a mixture of cyclohexane and cyclohexanone (CH/CH=O) with a cheap oxidizing agent like O-2 or air, under mild conditions using N-hydroxyphtalimide (NHPI) and transition metals as catalysts. The study showed that the CH/CH=O mixture oxidized faster than CH and CH=O separately due to the higher oxidizability of CH=O compared to CH. The presence of CH=O also increased the polarity of the reaction mixture, enhancing the solubility of NHPI. The study further investigated the influence of catalyst type and amount, CH/CH=O ratio, temperature, time, and oxidizing agent type on the composition of the oxidation products.
Article
Engineering, Environmental
Zhiyang Zhang, Mi Hu, Qingfeng Gui, Jing Gu, Wenlong Xu, Qingbo Xiao, Wei Huang
Summary: In this study, an Au@NaX catalyst was proposed by using an improved in-situ crystallization method, which combines Au with NaX catalyst. This catalyst can effectively and selectively convert cyclohexane to adipic acid in the absence of any other chemicals, using molecular oxygen as the oxidant. It exhibits remarkable performance, with a 29.5% conversion of cyclohexane and an 85.6% selectivity to adipic acid, far exceeding most published results.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Maxim L. Kuznetsov, Armando J. L. Pombeiro
Summary: The study investigates a new mechanism for the ecological oxidation of cyclohexane into adipic acid, using iron(II) complex as a catalyst under room temperature and radiation-free conditions. The catalyst significantly improves the conversion rate and selectivity towards adipic acid, opening up a new synthetic route and reducing the accumulation of intermediates.
JOURNAL OF CATALYSIS
(2021)
Article
Engineering, Chemical
Nazmun Sultana, Chandan Guria, Vinod K. Saxena
Summary: The study investigates the renewable synthesis of AA-type monomers, namely adipic and azelaic acid, from linoleic acid using a bromide-promoted transition metal catalyst. Liquid-phase catalytic oxidation is conducted using a Co(II)-Mn(II) acetate catalyst system and hydrogen bromide in an acetic acid solvent. The influence of process variables on LA conversion and product yields is studied, and the rate-controlling step for LA oxidation is analyzed.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Chemistry, Physical
Enxian Yuan, Meixia Zhou, Panming Jian, Xu Hou
Summary: Atomically-dispersed and high-loading Co on graphitic carbon nitrogen were synthesized and used as catalyst for solvent-free aerobic oxidation of cyclohexane. The catalyst showed high stability and catalytic performance, demonstrating good universality for the oxidation of various cycloalkanes and alkyl aromatics.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Xiao Wang, Wenyi Bian, Tianyang Zhang, Yajie Zhao, Mingwang Shao, Haiping Lin, Yang Liu, Hui Huang, Zhenhui Kang
Summary: Carbon dots with high crystalline core demonstrated excellent performance in catalytic oxidation of cyclohexane to adipic acid, achieving high conversion and selectivity. The study also utilized machine learning to understand the correlation between CD features and catalytic performance.
Article
Chemistry, Physical
Sonu Bhandari, Rubina Khatun, Mukesh Kumar Poddar, Anil Chandra Kothari, Rajaram Bal
Summary: Researchers have synthesized a Co3O4@ZrO2 nanostructured catalyst that can convert cyclohexane to adipic acid directly in air without the need for additional reagents, demonstrating high selectivity and efficient catalytic activity.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Physical
Sheyda Nilforoushan, Mehran Ghiaci, Sayyed Mahdi Hosseini, Sergei A. Kulinich, Wilfried Wunderlich, Hossein Farrokhpour
Summary: In this study, a simple method was reported to create gold nanoparticles coated-double silica shells with narrow size distribution. The nanoparticles showed high catalytic activity and selectivity in the aerobic oxidation of cyclohexane under mild conditions.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Dnyanesh Vernekar, Mohammad Dayyan, Satyajit Ratha, Chandrashekhar Rode, M. Ali Haider, Tuhin Suvra Khan, Dinesh Jagadeesan
Summary: This work investigates the catalytic activity of trimetallic mixed-metal oxyhydroxide WFeCoO(OH) for the direct oxidation of cyclohexane to adipic acid. The presence of acidic, basic, and redox sites on WFeCoO(OH) contributes to its enhanced catalytic performance. Surface lattice oxygen, acidity, and propensity to generate oxygen vacancies all play crucial roles in the catalytic process.
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)