Article
Chemistry, Applied
N. Catherin, E. Blanco, D. Laurenti, L. Piccolo, F. Simonet, C. Lorentz, E. Leclerc, V Calemma, C. Geantet
Summary: The research explored the performance of various transition metal sulfides supported on Y zeolites in gas-phase decalin hydroconversion under high hydrogen pressure (5 MPa) and in the presence of 0.8% H2S concentration. The study revealed that catalytic activity was enhanced by using ternary sulfides, such as noble metal-based sulfides, leading to high decalin conversion levels and ring opening products.
Article
Chemistry, Physical
Wenli Zhao, Xiaopo Niu, Guangni Liu, Xiurong Zhang, Qingfa Wang
Summary: Three kinds of Pt nanocrystals with different morphologies were synthesized to prepare catalysts for the ring-opening reaction of decalin. The 5 nm truncated octahedral Pt/CNT-USY with exposed (100) and (111) facets showed higher yield of ring-opening products. Additionally, the 5 nm cubic Pt catalyst exhibited better catalytic activities compared to the 10 nm cubic Pt catalyst, attributed to the smaller size and more revealable metal active sites of Pt nanocrystals.
Article
Engineering, Environmental
Soheil Valizadeh, Sumin Pyo, Young-Min Kim, Hanie Hakimian, Young -Kwon Park
Summary: Catalytic pyrolysis of cow manure using HZSM-5, HBeta, and HY zeolites was conducted, and HZSM-5 showed the highest production efficiency of benzene, toluene, ethylbenzene, xylene, and naphthalene. The acidity and pore structure of the catalysts played a crucial role in the efficiency. Increasing the acidity, reaction temperature, and catalyst-to-feedstock ratio further increased the production of BTEXN and decreased oxygen-containing compounds.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Peng Shan, Panpan Niu, Huifang Zhang, Chuanhao Zhang, Ningyue Lu, Yan Wang, Binbin Fan, Ruifeng Li
Summary: The Ir/H-SSZ-13 catalysts showed higher activity and yields in methylcyclopentane ring-opening reaction compared to other catalysts. Ir species supported on H-SSZ-13-A exhibited higher activity than those on H-SSZ-13-B, especially at low Ir loading. The presence of strong acid sites on the external surface of H-SSZ-13-A promoted the reactivity of Ir/H-SSZ-13-A, making it a potential catalyst for ring-opening reactions.
CATALYSIS COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Silvana A. D'Ippolito, Adriana D. Ballarini, Santiago M. Rosas, Laurence Pirault-Roy, Catherine Especel, Florence Epron, Carlos L. Pieck
Summary: The study investigated the influence of Ir content on sulphur tolerance for the selective ring opening of decalin. Results show that metallic and acid functions limit the reaction rate, sulphur significantly modifies product distribution, and the support has minimal impact on sulphur tolerance. Additionally, the amount of S per Ir surface atom plays a role in the poisoning of the catalyst.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Ewa Chukwu, Lindsay Molina, Conner Rapp, Luis Morales, Zehua Jin, Stavros Karakalos, Hui Wang, Sungsik Lee, Michael J. Zachman, Ming Yang
Summary: Increasing the surface population of supported catalytic sites is generally a beneficial approach to improving performance; however, we found that in the case of Pt/a-MoC catalysts with atomically dispersed Pt, the intrinsic activity declines as Pt loading increases. The shrinking inter-Pt-atom space hinders CO2 activation at Pt-Mo interfaces, and even when Pt is atomically dispersed, it is underutilized in crowded conditions. This cautionary observation is applicable to other systems where the support plays a crucial catalytic role.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Leticia F. Sosa, Priscilla M. de Souza, Raphaela A. Rafael, Robert Wojcieszak, Valerie Briois, Lucas R. Francisco, Raimundo C. Rabelo-Neto, Eric Marceau, Sebastien Paul, Fabio S. Toniolo, Fabio B. Noronha
Summary: This study investigated the performance of Mo2C, Mo2C/SiO2, Ni-MoxCy/SiO2, and Cu-MoxCy/SiO(2 )catalysts for the hydrodeoxygenation of m-cresol at 300℃ and atmospheric pressure. The presence of a second metal promoted the first step of reduction but did not assist the carburizing step. All carbides were highly selective to toluene, indicating that Mo2C species is the active site responsible for the deoxygenation of m-cresol. The Mo2C/SiO2 catalyst carburized at 400℃ was inactive due to the lower oxophilicity of the oxycarbide species.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Materials Science, Multidisciplinary
Ning-Ning Zhao, Zhen-Feng Ouyang, Pei-Han Sun, Jian-Feng Zhang, Kai Liu, Zhong-Yi Lu
Summary: Based on first-principles calculations and theoretical analysis, we demonstrate that large Berry curvature dipoles and Ising superconductivity can coexist in monolayer MXene heterostructures of T-Mo2C/H-Mo2C. The large Berry curvature dipoles result from multiple band anticrossings and band inversions near the Fermi level. The breaking of in-plane space-inversion symmetry in these 2D superconductors induces Ising-type spin-orbit coupling, and one of the heterostructures is identified as a Z2 topological metal.
Article
Chemistry, Multidisciplinary
XinBao Li, Han Fu, Qi Zhou
Summary: By preparing nano-porous Ni-Co alloys and forming bimetallic sulfides and Ru modification on their surfaces, the electrocatalytic hydrogen evolution performance of electrocatalyst materials can be improved. When the Ru content is 60%, a three-dimensional network flake structure with excellent catalytic activity is formed, resulting in superior electrocatalytic properties and stability of the NiCo2S4/Ru (60%) composite electrode.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Alinda Samsuri, Mohd Nor Latif, Mohd Razali Shamsuddin, Fairous Salleh, Maratun Najiha Abu Tahari, Tengku Shafazila Tengku Saharuddin, Norliza Dzakaria, Mohd Ambar Yarmo
Summary: Temperature programmed reduction (TPR) analysis was conducted to investigate the chemical reduction progression behavior of molybdenum oxide (MoO3) catalyst. Characterization of the reduced phases was performed using XRD, XPS, and FE-SEM. The study revealed that hydrogen showed better reducibility compared to carbon monoxide, achieving deeper penetration into the MoO3 catalyst.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Li Gong, Xiao Mu, Qiang Li, Lei Ma, Yucong Xiong, Rong Li
Summary: An efficient electrocatalyst NC@Mo2C@MoS2-(Ni) was designed for the Hydrogen Evolution Reaction in water electrolysis, showing good catalytic performance in both acidic and basic media. This work not only fabricates a catalyst for hydrogen evolution, but also provides a method to design more efficient functional electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Qingyun Chen, Xuhai Li, Yong Cheng, Wenqian Zhou
Summary: This study demonstrated a simple and cost-effective method for synthesizing molybdenum nitride and molybdenum carbide in a normal air atmosphere. By using sodium molybdate and dicyandiamide as reagent precursors and conducting reactions at specific temperatures, pure and highly crystalline products were obtained. This method offers a better cost-effective alternative compared to conventional approaches.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Elizabeth L. Goldstein, Felix Ziegler, Ann-Katrin Beurer, Yvonne Traa, Johanna R. Bruckner, Michael R. Buchmeiser
Summary: This article reports a method for selective macro(mono)cyclization of dienes using catalysts confined inside mesoporous silica and finds that the proximity of the catalyst to the surface of silica material affects the selectivity. The catalyst displays a higher Z-selectivity when confined inside a pore or bound to non-porous silica.
Article
Engineering, Multidisciplinary
Trino Romero, Luis Melo, Maria Esparragoza, Rosarmy Avila, Alexander Moronta, Gabriela Carruyo, Luis Garcia, Caterine Donoso, Laura Saenz, Carlos Yugcha-Pilamunga
Summary: Bimetallic Pd-Pt/HY catalysts with an atomic variation of Pd/Pd+Pt were prepared and used for the conversion of toluene and methylcyclohexane. The catalysts were characterized by various methods, including BET, CO chemisorption, H2-TPR, and NH3TPD. Results showed a strong interaction between Pd and Pt in Pd-Pt/HY catalysts. The introduction of metals influenced the distribution of acid sites, with Pd0Pt100/HY > Pd100Pt0/HY > Pd33Pt67/HY in terms of acidity. The Pd/Pd+Pt atomic composition of 0.33 and the relative distribution of weak/strong acid sites of 2 favored the desired reaction pathways.
Article
Energy & Fuels
Liying Wang, Huan Luo, Chunmei Wang, Kai Yu, Lige Gong, Chunxiao Wang, Muhammad Imran, Baibin Zhou
Summary: In this study, CuH{PMo12O40}@Cu(Melamine) ({PMo12O40}@Cu-Melamine) and nitrogen-doped carbon-coated copper and molybdenum carbide (Cu-Mo2C@NC) were synthesized and their supercapacitor performance was compared. It was found that Cu-Mo2C@NC exhibited higher specific capacitance, better cycle stability, and higher energy density compared to {PMo12O40}@Cu-Melamine.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Anakaren Botana de la Cruz, Philip Boahene, Sundaramurthy Vedachalam, Ajay K. Dalai, John Adjaye
Article
Energy & Fuels
Sundaramurthy Vedachalam, Philip Boahene, Ajay K. Dalai
Review
Chemistry, Applied
Biswajit Saha, Sundaramurthy Vedachalam, Ajay K. Dalai
Summary: ADS is gaining attention as a low-cost desulfurization technique for petroleum fuels, utilizing adsorbents to remove sulfur compounds. The latest developments focus on enhancing selectivity, stability, reusability, and performance improvement through the incorporation of metals. Selectivity is a key challenge in ADS, and testing with real feedstocks is crucial for commercial application.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Chemical
Biswajit Saha, Sundaramurthy Vedachalam, Ajay K. Dalai
Summary: Geopolymer, a porous aluminosilicate material similar to zeolites, was studied for its suitability in adsorptive desulphurization (ADS) using a petroleum feedstock. Surface Na and Al elements were found to interact with sulphur compounds, leading to a high sulphur adsorption capacity of 38.4 mg/g. In addition, the adsorption process is spontaneous, exothermic, and follows pseudo-first-order kinetics.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Sundaramurthy Vedachalam, Philip Boahene, Ajay K. Dalai
Summary: This study focused on preparing and characterizing bifunctional platinum catalysts supported on TUD-1, with varying acidity by incorporating Al in the framework. The presence of Bronsted acid sites enhanced hydrocracking and hydroisomerization of Fischer-Tropsch wax, leading to increased production of jet fuel range hydrocarbons. Ultimately, an optimal Pt/Al-TUD-1 catalyst with a Si/Al ratio of 10 was found to be effective in producing jet fuel range hydrocarbons meeting ASTM specifications through hydrorefining at specific pressures and temperatures.
Article
Chemistry, Applied
Sundaramurthy Vedachalam, Ajay K. Dalai
Summary: The recent global sulfur cap on marine fuels has increased the demand for low-sulfur marine fuels. Existing desulfurization processes are not cost-effective for reducing the sulfur level to the mandated level. This study proposes a new combination of desulfurization methods, including hydrotreatment and oxidative desulfurization, to achieve the desired sulfur level.
Article
Energy & Fuels
John Eleeza, Philip Boahene, Sundaramurthy Vedachalam, Ajay K. Dalai, John Adjaye
Summary: The acidity of the catalyst significantly affects fines deposition during the hydrotreating process of heavy gas oil, with higher acidity leading to lower fines deposition. Thicker asphaltene coatings result in higher fines deposition. After hydrotreating, there is a decrease in the weak acidic sites on the spent catalyst.
Review
Energy & Fuels
Sundaramurthy Vedachalam, Nathalie Baquerizo, Ajay K. Dalai
Summary: With the growth of the shipping industry comes an increase in emissions of pollutants, prompting the International Maritime Organization to set regulations aimed at reducing the environmental impact of shipping. The new IMO 2020 regulations restrict the sulfur content in marine bunker fuels to 0.5%, with various compliance options and alternative fuels being discussed as potential solutions to meet these regulations.
Article
Energy & Fuels
Jiyuan Fan, Aiping Chen, Saumitra Saxena, Sundaramurthy Vedachalam, Ajay K. Dalai, Wen Zhang, Abdul Hamid Emwas, William L. Roberts
Summary: The study found that Mo/Ti-TUD-1 catalyst showed good oxidative desulfurization (ODS) performance for model oil under both mechanical stirring and ultrasound conditions, with ultrasound assistance significantly shortening the reaction time. The oxidative reactivity of sulfur compounds in the model oil followed the same order under mechanical stirring and ultrasound: 4,6-DMDBT > DBT > BT.
Article
Engineering, Chemical
John Eleeza, Sundaramurthy Vedachalam, Philip Boahene, Ajay K. Dalai, John Adjaye
Summary: The study found that LHSV is the key factor affecting fines deposition, with higher LHSV resulting in decreased deposition. Pressure and temperature show interactive effects, with specific combinations minimizing deposition. The opposite surface charges of fines and the catalyst create an attractive force leading to fines deposition.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Philip E. Boahene, Sundaramurthy Vedachalam, Ajay K. Dalai
Summary: A facile one-pot synthesis was developed to produce a series of metal-substituted TUD-1 mesoporous (MTUD-1) supports, which were used for the catalytic oxidation desulfurization of light gas oil (LGO). The physicochemical properties of the supports and catalysts were characterized, and the cerium substituted TUD-1 supported catalyst showed the highest oxidation activity to sulfur compounds of LGO.
Article
Engineering, Chemical
Carson Polischuk, Sundaramurthy Vedachalam, John Eleeza, Anakaren Botana de la Cruz, Ajay Dalai, John Adjaye
Summary: Experiments showed that fine particles such as minerals, heavy metals, and coke can cause pressure buildup in the hydrotreater, leading to premature shutdown of the reactor system. Iron(III)oxide was found to have a promoting effect on the hydrotreating process, while petroleum coke and other fines had no significant impact on catalyst activity and reactions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Review
Energy & Fuels
Carson Polischuk, John Eleeza, Sundaramurthy Vedachalam, Ajay K. Dalai, John Adjaye
Summary: This review examines the sources, issues, and mitigation methods of oil sand foulants in production and processing. It provides an overview of chemicals and processes used industrially for their treatment and identifies several potential solutions for reducing foulants. The review also discusses the influence of operating conditions on fouling and suggests changes that can improve efficiency and reduce environmental impacts.
Article
Energy & Fuels
Biswajit Saha, Sundaramurthy Vedachalam, Atanu Kumar Paul, Ajay K. Dalai, Saumitra Saxena, William L. Roberts, Frederick L. Dryer
Summary: As petroleum recovery has increased the proportion of heavier crudes and refining process residues, the challenge of processing these crudes has risen. The presence of asphaltenes in heavy crudes leads to reduction in combustion efficiency, clogging of refinery pipes, and emissions of particulate matter. This study investigates the deasphalting of heavy fuel oil using different methods, and finds that microwave-assisted deasphalting is more efficient in removing asphaltenes. The optimization of process parameters further improved the quality of the fuel oil. The outcomes of this study are important for the petrochemical industry as they enable improved crude oil processing in a more effective and economical manner.
Article
Chemistry, Physical
Priyanga Gandhi, Biswajit Saha, Sundaramurthy Vedachalam, Ajay K. K. Dalai
Summary: The conversion of furfural and acetone into 4-(2-furyl)-3-buten-2-one (FAc) was studied using Cu/Al-MCM-41, Cu/Al-TUD-1, and Cu/FDU-12 mesoporous catalysts. The Cu/Al-MCM-41 catalyst showed the highest conversion of furfural and selectivity to FAc. The process parameters were optimized using response surface methodology, and the catalyst could be reused three times with minimal decrease in conversion and selectivity.
SUSTAINABLE ENERGY & FUELS
(2023)
