Article
Engineering, Chemical
Fei Wang, Yefeng Liu, Ying Lv, Jun Ren, Ruixin Wang, Weizhou Jiao
Summary: In this study, tungsten carbide coated with an ultrathin carbon layer was utilized as an efficient and stable oxidative desulfurization catalyst. The catalyst showed remarkable performance in desulfurization under mild conditions and could be easily regenerated and recycled without loss of performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Rui Song, Xueqin Zhang, Huihui Wang, Chuanfu Liu
Summary: Polyoxometalate (POM) has great potential in oxidative desulfurization (ODS) reaction. However, its high solubility in common solvents hinders recycling, and its small specific surface area limits interaction with the substrate. In this study, cellulose nanofibrils (CNFs) were modified with APTs to provide positive charges on their surfaces, and PTA was loaded to obtain A-CNF/PTA aerogel as the ODS catalyst. The aerogel showed increased specific surface area, uniform 3D network structure, and excellent catalytic performance in ODS.
Article
Energy & Fuels
Fu-Min Li, Ming-Qing Hua, Yan-Chen Wei, Ji-Xing Liu, Jia-Hong Gong, Chao Wang, Pei-Wen Wu, Yan Huang, Hua-Ming Li, Wen-Shuai Zhu
Summary: The study successfully reduced the sulfur content of high-sulfur petroleum coke (HSPC) using a CTAB@HPA composite, oxidant hydrogen peroxide, and extractant ionic liquid, exploring the oxidative desulfurization mechanism.
Article
Energy & Fuels
Yang Lina, Zhang Xi, Cui Licheng, Xu Meizhen, Li Jian
Summary: TiO2-PTA/BMMS catalyst was synthesized for photocatalytic oxidative desulfurization, achieving a desulfurization rate of 99.6% under UV irradiation. The catalyst maintained stable catalytic activity after eight cycles of reuse, indicating good reusability. The synergistic effects of photocatalytic oxidation and methanol extraction played a crucial role in the catalytic system.
CHINA PETROLEUM PROCESSING & PETROCHEMICAL TECHNOLOGY
(2021)
Article
Engineering, Chemical
Chongfu Wu, Changsheng Chen, Zhaoyang Qi, Jie Chen, Qinglian Wang, Changshen Ye, Ting Qiu
Summary: The ultra-deep desulfurization of oil is an urgent task due to various problems such as environmental pollution and environmental protection requirements. Oxidative desulfurization (ODS) is considered the most promising technology, but the synthesis of highly efficient and stable HPW-based heterogeneous catalysts remains challenging. In this paper, a simple one-step method was used to prepare a PEHA-HPW heterogeneous catalyst for ultra-deep desulfurization of fuel oil. The composite material showed excellent catalytic activity and high recyclability.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Mohammad Ali Rezvani, Nahid Jafari
Summary: A new FeW/MgO/CS hybrid nanocomposite was synthesized and utilized as a heterogeneous catalyst in catalytic oxidative desulfurization reactions, achieving up to 95% oxidation efficiency for both model liquid fuels and gasoline under mild conditions. The nanocomposite demonstrated excellent sulfur removal properties and reusability, showing potential for the production of clean transportation fuels.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Applied
Yue Du, Lina Zhou, Zhenhui Liu, Lun Yang
Summary: Highly ordered three-dimensional macroporous polyoxometalate-based zirconia hybrids with relatively high surface area and interconnected pore structure were fabricated using colloidal crystal template method. This composite exhibited excellent extractive-oxidative desulfurization activity and recyclability, with the ability to remove 500 ppm of dibenzothiophene in model fuel within 2 hours under mild conditions and maintaining catalytic activity even after 20 cycles. The oxidative reaction of dibenzothiophene followed pseudo-first-order kinetics with an Arrhenius activation energy of 61.1 kJ/mol.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Asmaa A. Abdelrahman, Ahmed M. A. El Naggar, Asmaa I. Zahran
Summary: The combination of phosphotungstic acid and calcined ZnAl layered double hydroxides forms a composite material with high catalytic activity and stability in ultrasound-oxidative desulfurization. This composite material achieved efficient desulfurization in an environmentally friendly manner.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Zun Man, Yang Meng, Xiaochang Lin, Xiaorong Dai, Leiping Wang, Dezhao Liu
Summary: The photocatalytic activity of titanium dioxide (TiO2) can be greatly improved by coupling with UiO-66 to purify odor pollutants containing reduced sulfur compounds (RSCs). UiO-66@TiO2 nanocomposites with different blending ratios were synthesized, and the U1T3 composites showed the highest photocatalytic activity compared to pristine UiO-66 and TiO2. The photocatalytic activity was found to be enhanced with increased relative humidity up to 60%, but excessive water at 90% relative humidity weakened the photocatalytic effects. UiO-66@TiO2 nanocomposites with enhanced photocatalytic performance could promote the practical applications of MOF-based photocatalysts for the degradation of odor pollutants.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Biswa Nath Bhadra, Sung Hwa Jhung
Summary: A novel tricomponent composite material has been developed, which can be used as a precursor to prepare stable micro/nano tungsten nitride@porous carbon nanocomposites with excellent catalytic performance by controlling the loading amount of melamine. The obtained materials show remarkable potential for oxidative desulfurization of liquid fuel.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Vojtech Kundrat, Vit Vykoukal, Zdenek Moravec, Zdenek Kral, Petr Machac, Lucie Simonikova, Jiri Pinkas
Summary: Metallic tungsten microfibers were prepared via electrospinning in three steps using a solution of phosphotungstic acid and polyvinyl alcohol. Green composite microfibers of H3PW12O40/PVA were easily electrospun from precursor solutions using a Nanospider instrument. Subsequent oxidation and decomposition provided ceramic WO3/P2O5 fibers, which were then reduced to produce pure metallic tungsten microfibers.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Tanatchporn Sirimekanont, Pitt Supaphol, Korakot Sombatmankhong
Summary: A two-dimensional nanostructure composed of Ag2O nanobranches attached to TiO2 hollow nanofibres was prepared through sol-gel and coaxial electrospinning techniques. The Ag/TiO2 hollow nanofibres were calcined to achieve the formation of anatase TiO2 with a well-retained hollow structure. The hydrothermal treatment resulted in the growth of Ag2O nanobranches on the TiO2 surface, leading to changes in physical appearance, surface area, and electrical conductivity of 2D Ag2O/TiO2.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Electrochemistry
Manman Xia, Jun Li, Ruyan Lei, Baige Yuan, Ying Zhang, Peng Zhao, Xiao Li
Summary: Porous anatase TiO2 nanofibres synthesized with camphene as a pore-creating agent demonstrated excellent electrochemical performance in lithium-ion batteries, showing higher specific surface area, initial discharge specific capacity, cycle performance, and rate performance compared to those without camphene. The improvement in electrochemical performance was attributed to low charge transfer resistance and a larger transportation rate of Li+ due to the higher specific surface area obtained.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2021)
Article
Energy & Fuels
Fatemeh Jangi, Nader Rahemi, Somaiyeh Allahyari
Summary: In this research, phosphotungstic acid (PTA) was impregnated on natural zeolites for oxidative desulfurization of dibenzothiophene (DBT). PTA-Ferr showed the highest DBT removal efficiency among the samples, with more than twice the removal rate compared to other samples.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Josefa Ortiz-Bustos, Isabel del Hierro, Yolanda Perez
Summary: The incorporation of iron and sulphate ions on TiO2 nanoparticles improved the catalytic performance, and a multifunctional and visible-light active photocatalyst was designed to remove pollutants from transportation fuels and water. Doping with a low amount of iron enhanced the photocatalytic performance, with the 1.2%S-0.5%Fe-TiO2 photocatalyst showing the highest activity under visible light irradiation. The improved electron charge transfer behavior of this photocatalyst was confirmed by electrochemistry measurements, and the stability and recyclability of the best photocatalyst were evaluated.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Haojie Li, Bingke Yang, Zhen Yao, Xuetao Wang, Kaiming Shen, Mengjie Liu
Summary: This study systematically investigates the influence of metal and nonmetal element doping on the photochemical properties of g-C3N4 for efficient catalytic AB hydrogen production. It provides a design method for high performance bifunctional catalysts of photocatalysis and metal catalysis. The results show that both non-metals (B, P) and metals (Ru, Ni) have efficient regulatory effects on the band structure of g-C3N4, resulting in a reduced band gap and improved hydrogen production. The study offers a theoretical method for the coupling of metal catalysis/photocatalysis ammonia borane to produce hydrogen.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Shrouq Mujahed, Davide Gandolfo, Luigi Vaccaro, Evgueni Kirillov, Dmitri Gelman
Summary: In this study, a high-valent Ru(IV) bifunctional catalyst was successfully applied for the hydrosilylation of various functional groups. The high-valent hydride complexes showed high chemoselectivity and affinity towards reducing polar bonds. The scope, limitations, and plausible mechanism of the reaction were described.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yongzhen Peng, Kongchen Xia, Qi Wu
Summary: In this study, we report an engineered cyclohexanone monooxygenase that can be used for the asymmetric synthesis of chiral alpha-deuterated carbonyl compounds via enantioselective reductive dehalogenation. The engineered enzyme exhibits good chemoselectivity, stereoselectivity, and d-incorporation, making it a promising method for the synthesis of deuterated drugs.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qi Yang, Ruixuan Xu, Hongqi Nie, Qilong Yan, Jun Liu, Jiuyu Chen, Yunlan Sun
Summary: The adsorption and decomposition processes of ammonium perchlorate (AP) on pure-Al and Al2O3/Al surfaces were investigated using density functional theory. The results showed that the pure-Al surface is more conducive to the decomposition of AP and the activation of NH3, while the Al2O3/Al surface promotes the disengagement of H and NH3 decomposition.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yudong Hu, Guochao Xu, Ye Ni
Summary: This study identified a novel phenylalanine dehydrogenase (QtPDH) with high catalytic efficiency and thermal stability, making it a promising biocatalyst for industrial production of bulky aromatic primary amines. QtPDH exhibited a broader substrate specificity and significantly longer half-life compared to BbPDH.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Weiling Zhao, Zhiling Huang, Hui Shen, Xianglong Li, Shaofen Zhao, Bo Xie, Shengjie Xia
Summary: This study investigated the effects of metal doping and crystal plane selection on the CO2 adsorption properties of MgO using density functional theory (DFT) methods. The results showed that the appropriate crystal plane and metal doping can improve the adsorption properties of MgO on CO2. The influence of different crystal planes and metal dopants on CO2 adsorption properties varied significantly. The research provides some references for experimental studies on CO2 adsorption by MgO by combining the dual modification of crystal plane and doped metal.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Jie Zhang, Jinwei Chen, Zongbo Shi, Junyu Zhao, Runsheng Zhuo, Ruilin Wang
Summary: In this study, a double-layered silicalite-1 support with high specific surface area was synthesized, and a magnesium modification strategy was adopted to improve the catalytic activity and stability of the zinc-based catalyst. The modified catalyst showed enhanced propylene selectivity and anti-coking property.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Pei-Sen Gao, Chang-Wang Pan, Cheng Liu, Wen -Tong Chen
Summary: Asymmetric electrocatalysis offers a unique approach to obtain enantioenriched molecules that are difficult to obtain through conventional methods. This study developed a novel bifunctional electrocatalyst, enabling the oxidative kinetic resolution of chiral 1,4-diols and gamma-lactones. The work demonstrates the potential of bifunctional electrocatalysis for asymmetric synthetic methods and its importance in the development of novel electrocatalytic methods.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qinzhe Lin, Xuanjin Lv, Xianming Zeng, Mengning Zhong, Qiyun Wu, Huilin Ren, Shenpeng Xu, Wentian Chen, Wenting Du, Jun Li
Summary: The catalytic efficiency of engineered IRED M5 was found to be relatively low when tasked with a bulky amine substrate. Rational design led to the mutants M203V and F260A, with F260A exhibiting a substantial improvement in conversion and stereoselectivity. The study revealed the potential molecular mechanisms underlying the effect of F260A and M203V on catalytic performance.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhishuai Wang, Fengyun Su, Hailong Cao, Mengzhen Tian, Xiang Li, Haiquan Xie, Xiaoli Jin, Zhengdao Li, Xin Ying Kong
Summary: In this study, the efficiency of photocatalytic CO2 reduction was significantly enhanced by incorporating nickel oxide onto niobium pentoxide. The resulting catalyst showed remarkable methane and carbon monoxide production improvements.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
A. Yu. Sidorenko, Yu. M. Kurban, T. V. Khalimonyuk, I. V. Il'ina, N. S. Li-Zhulanov, O. S. Patrusheva, V. V. Goltsova, M. P. Bei, Zh. V. Ihnatovich, J. Warna, K. P. Volcho, N. F. Salakhutdinov, D. Yu. Murzin, V. E. Agabekov
Summary: This study provides a comprehensive investigation into the catalytic condensation of renewable 3-carene with formaldehyde for the one-step preparation of terpenoid trans-4-hydroxymethyl-2-carene. Various acids and alumino-silicates were found to catalyze the reaction, but the selectivity to the desired product was limited. Phosphoric acid showed the highest selectivity, and an excess of formaldehyde or catalyst loading significantly increased the yield of the target product. Water presence also led to increased selectivity. Additionally, a detailed mechanism for the 3-carene condensation with formaldehyde was proposed and confirmed through kinetic modeling.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Meng-Yu Rong, Jing Nie, Shen Li, Jun-An Ma
Summary: We synthesized a new class of chiral quaternary ammonium salts and used them as catalysts in phase-transfer catalytic asymmetric alkylation. By employing these catalysts, we obtained a series of chiral fluorinated aromatic alpha-amino acid derivatives with high yields and enantioselectivities.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhaozhou Wei, Guangtao Wei, Huixian Che, Deyuan Xiong, Linye Zhang, Ruihua Xue, Yalin Tang, Xuanli Lu
Summary: This study demonstrates that small-sized graphite crystallite and highly defective carbon-based catalysts can increase the -SO3H density of the catalysts and modulate their surface electronic properties, leading to improved efficiency in the alpha-pinene hydration reaction. The reduction of graphite crystallite size is considered a critical step in enhancing the selectivity of alpha-terpineol.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Kempanna S. Kanakikodi, Nagendra Kulal, K. S. Subramanya, M. S. Puneethkumar, Bhavana B. Kulkarni, Ganapati Shanbhag, Sanjeev P. Maradur
Summary: An effective and highly selective protocol for synthesizing asymmetric organic carbonates using dimethyl carbonate (DMC) as a reactant and solvent has been developed. The performance of CeO2 nanostructures with different morphologies in the carbonate interchange reaction (CIR) of alcohols was investigated, and the CeO2 nano-catalyst with rod morphology exhibited the highest oxygen vacancy and remarkable enhancement in conversion. The CeO2 characterization data revealed that the exposed active sites, defect density, coordination state of surface atoms, and reducibility of the catalytic materials are the contributing factors to its high catalytic activity. CeO2 can be easily recovered and reused for multiple cycles.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yanzhao Gao, Xianglei Meng, Shiqi Huang, Hui Wu, Liantao Jiang, Yu Zhou, Yuting Song, Yanyan Diao
Summary: Gamma alumina modified with alkaline earth metal shows improved catalytic performance for hydrogenation reactions. Pd catalysts supported by Al2O3 and Mg-modified Al2O3 were synthesized and their structure, composition, and surface acidity were investigated. The results showed that Pd/MgO-Al2O3-2 catalyst exhibited the best catalytic performance due to its metallic state palladium and weak acid sites.
MOLECULAR CATALYSIS
(2024)