Article
Chemistry, Physical
Chuwei Zhu, Xiang-Kui Gu, Wei-Xue Li
Summary: The bimetallic Cu/Rh catalyst is designed to significantly weaken the CO poisoning effect, improve activity, and favor CO oxidation via the OCOO-mediated associative mechanism with modest barriers, showing high low-temperature CO oxidation activity. The catalyst exhibits good structural stability and lower selectivity for H-2 oxidation, making it promising for the PROX reaction at low temperatures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Energy & Fuels
Fatemeh Zarei-Jelyani, Fatemeh Salahi, Mohammad Farsi, Mohammad Reza Rahimpour
Summary: Steam methane reforming is an important reaction for producing environmentally-friendly hydrogen from methane. In this study, Ni-Co co-impregnated catalysts were synthesized using a hollow sphere alumina support, leading to improved stability and performance. Among the catalysts tested, Ni-2-Co-1/H-Al2O3 showed the highest methane conversion and hydrogen yield at 700 ℃.
Article
Nanoscience & Nanotechnology
Abdelrahman S. Khder, Hatem M. Altass, Rabab S. Jassas, Munirah M. Al-Rooqi, Menna A. Khder, Moataz Morad, Ahmed Gebreil, Ziad Moussa, Saleh A. Ahmed
Summary: In this study, five catalysts containing 1 wt % monometallic gold (Au), palladium (Pd), and bimetallic gold-palladium (Au-Pd) with different ratios supported by MgO were prepared using a modified impregnation approach. The structure of each catalyst was thoroughly examined, and their catalytic activity was evaluated using carbon monoxide oxidation. The results showed that loading Au and/or Pd nanoparticles (NPs) had no significant effects on the crystal size, surface area, or pore radius of MgO. The formation of Au/Pd alloy was observed at a Au/Pd ratio of 1:1, and Au-rich catalysts demonstrated superior catalytic performance toward CO oxidation compared to Pd-rich catalysts. The higher activity was attributed to the small particles of Au0 and the oxidized/partially oxidized species (Au+, Pd2+, and Pd delta+), which provided active sites and active oxygen necessary for CO2 formation.
ACS APPLIED NANO MATERIALS
(2023)
Article
Energy & Fuels
Fatima Jalid, Tuhin Suvra Khan, M. Ali Haider
Summary: By employing first principles theoretical analysis and microkinetic modelling, bimetallic alloy catalysts of cobalt, palladium, and copper have been designed for CO2 assisted ethane dehydrogenation reaction. Through in silico simulations, certain alloy catalysts have been identified that can maintain high ethane and CO2 conversion rates, increase ethylene yield, and reduce coke formation, making them potential candidates for experimental testing and scale-up studies.
Article
Chemistry, Physical
Jochen Schuetz, Heike Stoermer, Patrick Lott, Olaf Deutschmann
Summary: The study reveals that aging catalysts leads to a decline in catalytic activity due to particle sintering, and bimetallic catalysts undergo morphological changes during hydrothermal treatment, transforming from core-shell structures to heterogeneous agglomerates.
Article
Chemistry, Physical
Yu -Ching Weng, Chieh-Lin Chiang
Summary: This study utilizes SECM to screen ternary metal catalyst arrays for formic acid oxidation. Pd-Co-Au and Pd-Co-Cu ternary metal catalyst arrays are prepared and reduced on a glassy carbon substrate. The optimal ratio of Pd2Co6Au2 and Pd2Co6Cu2 catalysts in the respective arrays is determined for efficient formic acid oxidation. The surface morphology of these catalysts is complex and diverse, mainly consisting of heterostructures of different metal oxides. These catalysts exhibit higher oxidation current and lower onset potential compared to a pure Pd catalyst. Electrochemical impedance spectroscopy analysis reveals their pseudo inductive behavior and the Pd2Co6Cu2 catalyst shows the lowest charge transfer resistance and removes adsorbates at the lowest overpotential.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Xiang Gong, Shuyi Guo, Zhao Jiang, Bolun Yang, Tao Fang
Summary: A series of Pd-M/Al2O3 bimetallic catalysts were successfully synthesized in this study, showing higher hydrogen release amount and NECZ selectivity by fine-tuning the alloy degree and nanoparticle size. The increase in NECZ selectivity mainly comes from the enhancement of the kinetic constant of the rate-limiting step.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Feng Shi, Jingdong Li, Jianxing Liang, Chenyu Bao, Jia-nan Gu, Kan Li, Jinping Jia
Summary: Pd-Cu bimetallic catalysts with good dispersion were synthesized by changing the loading sequence and annealing temperature. The catalyst showed high efficiency and potential for nitrate reduction towards N-2 generation. Combining with electrocatalytic hydrogen production, it achieved high efficiency of H-2 utilization and N-2 selectivity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Hee Jung Yoon, Ju Hyun Yang, So Jeong Park, Youngku Sohn
Summary: In this study, gamma-Al2O3 nanosheets were prepared and loaded with various transition metals, and their catalytic activities in thermal CO oxidation and photocatalytic CO2 reduction were fully examined. It was found that Rh, Pd, Ir, and Pt-loading led to significant enhancement in CO oxidation activity. Ag-Al2O3 nanosheets showed the highest performance in CO2 reduction experiments.
Article
Chemistry, Multidisciplinary
Hongchen Liu, Fan Yang, Fengjiang Chen, Sai Che, Neng Chen, Chong Xu, Ni Wu, Wenkai Wei, Yongfeng Li
Summary: Exploring transition metal-based electrocatalysts with excellent performance in alkaline overall water splitting is important but challenging. In this study, a bimetallic Ni-Co selenide heterostructure aerogel (NiSe2-CoSe2) was designed and prepared for efficient overall water splitting. The optimized sample showed extremely low overpotentials for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1 M KOH electrolyte. Assembled as an electrolyzer, NiSe2-CoSe2 achieved high current density at low cell voltage, comparable to commercial noble-metal catalysts. The exceptional performance was attributed to the unique porous morphology and bimetallic selenide heterostructure. This work provides an anticipated perspective for transition metal selenide bifunctional electrocatalysts.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Biochemistry & Molecular Biology
Henrik E. Hansen, Daniel O. Fakhri, Frode Seland, Svein Sunde, Odne S. Burheim, Bruno G. Pollet
Summary: In this study, Cu@Pt bimetallic nanocatalysts were successfully synthesized using the sonochemical method, exhibiting significantly higher mass activity in the hydrogen evolution reaction compared to traditional Pt catalysts.
Article
Chemistry, Physical
Xiao Li, Lisha Xing, Wanjun Zhao, Yongzhao Wang, Yongxiang Zhao
Summary: The addition of FeCl3 can enhance the catalytic performance of Pd-Cu/HAP in low-temperature CO selective oxidation reactions, resulting in higher CO conversion rate and CO2 selectivity. This is attributed to the strong interaction between Fe2O3 species and Pd-Cu/HAP, promoting the oxidation of Pd0 species and enhancing CO activation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Feng Hong, Guanjian Cheng, Weihao Hu, Shengyang Wang, Qike Jiang, Junhong Fu, Botao Qiao, Jiahui Huang
Summary: Gold-based catalysts have shown promise for CO preferential oxidation (CO-PROX) reaction in H-2-rich streams due to their high intrinsic activity for CO elimination even at room temperature. However, the competition of H-2 oxidation and the low stability of gold nanoparticles have limited the CO conversion at elevated temperatures. In this study, a Au-Cu bimetallic catalyst prepared by galvanic replacement method was found to exhibit a wide temperature window for CO total conversion (30-100 degrees C) and excellent catalyst stability without deactivation during a 200-hour test. Detailed characterizations and density functional theory (DFT) calculations revealed that the synergistic effect of Au-Cu and the electron transfer from Au to Cu enhanced the chemisorption of CO and weakened the dissociation of H-2, inhibiting the competition of H-2 oxidation and widening the temperature window for CO total conversion.
Article
Chemistry, Physical
Hao Shen, Yunzhe Wang, Tanmoy Chakraborty, Guangye Zhou, Canhui Wang, Xianbiao Fu, Yuxuan Wang, Jinyi Zhang, Chenyang Li, Fei Xu, Liang Cao, Tim Mueller, Chao Wang
Summary: This study reports the selective reduction of CO to acetate using Cu-Pd bimetallic electrocatalysts and explores the underlying mechanism. The results demonstrate that the bimetallic catalyst exhibits high activity and selectivity for the conversion of CO to acetate.
Article
Chemistry, Physical
Isaias B. Aragao, Flavia R. Estrada, Dean H. Barrett, Cristiane B. Rodella
Summary: PdCo bimetallic catalysts were effectively dispersed on activated carbon through incipient impregnation with the use of oleyamine and oleaic acid as capping agents. The resulting catalyst showed a marked reduction in CO light-off temperatures compared to monometallic formulations.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Physical
Nazanin Mikaeeli, Mohammad Haghighi, Esmaeil Fatehifar, Maryam Shabani
Summary: A Y AgBr0.75Cl0.25 solid solution was prepared on carbon defects-MWCNTs and modified with DBD-plasma to fabricate an excellent nanophotocatalyst for efficient degradation of dye pollutants. This catalyst exhibited improved band gap, SPR property, reduced recombination rate, enhanced separation and transmission of charge carriers, and increased access to active sites, leading to excellent photocatalytic performance.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Neda Vardast, Mohammad Haghighi, Hossein Zeinalzadeh
Summary: This study successfully produced efficient and stable biodiesel from waste oil containing high free fatty acids using sonoassisted designed CeO2 = 20% nanocatalyst. The activity of the nanocatalysts is influenced by the dispersion of active components, specific surface area, pore volume, and acidity, with CeO2 = 20% showing the best performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Parisa Sadeghpour, Mohammad Haghighi, Amir Haghighi, Maryam Shabani
Summary: This study introduces the ultrasonic-promoted growth of staggered heterostructured nanoparticle-on-nanolayer tin(II) oxide-bulk carbon nanophotocatalysts. The photocatalytic performance of various ratios of SnO2-bulk g-C3N4 nanophotocatalysts was investigated, and the structural properties of the samples were analyzed using multiple characterization techniques. It was found that the tin oxide content in the nanocomposite framework significantly affected the structural properties of the photocatalysts and the separation efficiency of electrons and holes. The suggested reaction mechanism for dye degradation was also discussed in detail.
Article
Chemistry, Multidisciplinary
Seyed Mehdi Sajjadi, Mohammad Haghighi, Farhad Rahmani, Javad Eshghi
Summary: The aim of this study was to design nanocatalysts with enhanced anti-coke ability, high catalytic activity and stable performance for the oxidative conversion of CH4/CO2 mixture to syngas. NiAl2O4, WNiAl2O4, and CoWNiAl2O4 nanocatalysts were fabricated using sol-gel technique, and plasma treatment was utilized to enhance the performance of CoWNiAl2O4. The results showed that the addition of tungsten improved the rate of coke gasification and stability of the NiAl2O4 nanocatalyst, while the catalytic activity of WNiAl2O4 was lower due to active sites coverage. Cobalt addition was made to compensate for the reduction of catalytic activity, resulting in smaller particle size and uniform dispersion. However, the sol-gel prepared CoWNiAl2O4 showed higher coke deposition and deactivation. The plasma-enhanced sol-gel fabricated CoWNiAl2O4 exhibited excellent dispersion, fine particle size, strong metal-support interaction, and high surface area, leading to a X-CH4 of 92% at 850 degrees C. A well-maintained structure and excellent dispersion were observed after 48 h TOS.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Chemistry, Physical
Amin Sokhansanj, Mohammad Haghighi, Maryam Shabani
Summary: In this study, novel CuBi2O4 surface-sensitized bismuth subcarbonate nanoheterojuncted photocatalysts were prepared using hydrothermal technique with ultrasonic waves. The photocatalysts exhibited high degradation efficiency for malachite green under sunlight irradiation due to their heterojunction formation and flowerlike morphology. The structural, morphological, and optical properties of the nanophotocatalysts were investigated, and the stability, reaction mechanism, and kinetic evaluation of the selected photocatalyst were examined.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Marziyeh Shabani, Mohammad Haghighi, Alireza Ebrahimi, Sogand Aghamohammadi
Summary: The simultaneous effect of Si source and CTAB application as a surfactant on SAPO-34 preparation was investigated. TEOS as the Si source resulted in small crystallites of SAPO-34, while fumed silica led to larger crystallites.
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Energy & Fuels
Ensie Bekhradinassab, Akram Tavakoli, Mohammad Haghighi, Maryam Shabani
Summary: The efficient tablet-like manganese and iron incorporated titania catalyst was synthesized via microwave in the presence of 2-hydroxyethylammonium sulfate (ILS) as both fuel and sulfating agent for biodiesel production. The nature of fuels affected the catalyst's physicochemical properties and performance. MnFeTi(ILS) showed a good capability for producing biodiesel from sunflower and waste oil.
Article
Surgery
Pirouz Samidoust, Mohammad Taghi Ashoobi, Manouchehr Aghajanzadeh, Mohammad Sadegh Esmaeili Delshad, Mohammad Haghighi
Summary: Boerhaave's syndrome is a rare condition characterized by spontaneous esophageal perforation, which has a high morbidity and mortality rate if not diagnosed and treated promptly. This case report presents a patient with achalasia who was diagnosed with Boerhaave's syndrome and had a good outcome after early diagnosis and treatment.
INTERNATIONAL JOURNAL OF SURGERY CASE REPORTS
(2023)
Article
Environmental Sciences
Fatemeh Yousefi, Mohammad Haghighi, Maryam Shabani
Summary: A novel potato-on-rod-like Z-scheme plasmon Ag2CrO4-Ag2Mo2O7 heterojunction nano-photocatalyst was synthesized to degrade organic dyes under artificial sunlight. Characterization analysis confirmed the suitable structure and surface morphology of the photocatalyst, which exhibited remarkable catalytic activity. The catalyst also showed stability and reusability.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Chemical
Salar Mahboob, Mohammad Haghighi, Maryam Shabani, Amir Haghighi
Summary: This study investigates the sono-photodegradation of methylene blue using plasma-treated Fe2O3-ZnO/rGO as a photocatalyst. The plasma treatment enhances the contact area between nanoparticles and rGO sheets, leading to improved degradation performance. The plasma-treated Fe2O3-ZnO/rGO also exhibits good reusability, making it a promising catalyst for wastewater treatment.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Engineering, Environmental
Ali Mohammadi, Mohammad Haghighi, Maryam Shabani
Summary: A novel mesoporous nanosheet Z-scheme NCQDs-BNiO/Bi7O9I3 heterojunction nanophotocatalyst has been synthesized by the facile sonosolvothermal method and demonstrated its efficient removal of antibiotic/fluoroquinolones and solid/liquid phase photocatalytic reduction of CO2 under simulated solar light. The synthesized photocatalysts exhibit increased structural defects, enhanced optical absorption and excellent pharmaceutical pollutant removal efficiency, attributed to the efficient surface reactions, mass transfer facilitation and surface adsorption, as well as the utilization of ultrasound waves. The quintessential photocatalyst shows significant photoreduction activity in producing methanol.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Chemistry, Physical
Seddigheh Kohansal, Mohammad Haghighi, Maryam Shabani, Niloufar Mohseni
Summary: The study presents the fabrication of Z-scheme heterojunction sheet-like photocatalysts for environmental pollution control. By adjusting the fuel to oxidizer ratio, the physicochemical properties of the photocatalysts were optimized. The heterojunction nanosheets showed superior performance in removing aqueous tetracycline-HCl under solar light irradiation, attributed to the improved light harvesting, charge separation and transfer, as well as the increased pore volume and specific surface area.
SURFACES AND INTERFACES
(2023)
Article
Green & Sustainable Science & Technology
A. Niyati, M. Haghighi, M. Shabani
Summary: Novel plasmonic Ag-Bi4O5I2/carbonaceous nanocomposites were prepared and used for the photo-decomposition of fluoroquinolone antibiotics. The carbonaceous materials significantly increased the specific surface area and pore size of Bi4O5I2, resulting in remarkable activity for degradation. The Ag-Bi4O5I2/rGO nano photocatalyst showed excellent stability and high reusability.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Green & Sustainable Science & Technology
E. Abbasi, M. Haghighi, M. Shabani, A. Niyati, S. Mahboob
Summary: This study investigates the sonophotocatalytic degradation of organic pollutants over double Z-scheme plasmonic ZnO-Cu-CuO hybridized two-dimensional C3N4. It is found that the ZnO-Cu-CuO/C3N4 catalyst synthesized using ultrasound waves exhibits good catalytic properties, and increasing sonication power reduces the intensity of plasmonic Cu particles and increases the mesopore volume, facilitating the penetration of pollutants.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Engineering, Environmental
Leila Yosefi, Mohammad Haghighi, Mahin Maleki
Summary: In this study, p-n type BixOyIz/ZnFe2O4 nanoheterojunction was prepared using a two-step solvothermal-precipitation route in different solvents. The influence of solvent on the physicochemical and optical properties of the samples was investigated. The results showed that samples mediated by ethanol exhibited superior performance compared to those mediated by ethylene glycol, methanol, and water. This can be attributed to the band position of the nanophotocatalysts, with Bi7O9I3/ZnFe2O4 and BiOI/ZnFe2O4 exhibiting type I and type II heterojunction structures, respectively.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)