Article
Chemistry, Physical
Josef Blazek, Daria Toullis, Petr Straka, Martin Stas, Pavel Simacek
Summary: This study demonstrates the co-hydrotreating of rapeseed oil and a petroleum feedstock, showing that the catalyst had high hydrogenation activity and the hydrogen consumption increased with pressure. The conversion of rapeseed oil required higher hydrogen consumption compared to the hydrotreating of the petroleum feedstock.
Article
Chemistry, Multidisciplinary
Yanzeng Dong, Xiaohang Yu, Zhiheng Wang, Xin Li, Yanyan Liu, Ruiyao Gao, Songdong Yao
Summary: The effects of HY addition on the NiMoS active phase in NiMo(NH3) impregnated NiMo/Al2O3-HY catalyst and its role in 4,6-dimethyl-dibenzothiophene hydrodesulfurization were investigated. The results demonstrate that HY can enhance the HDS reaction by altering the morphology of NiMoS nanoclusters, even without involving the isomerization of 4,6-DMDBT. In the absence of strong acid sites, the turnover frequency (TOF) of the NiMo/Al2O3 catalyst was still improved by 90%.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Jihyun Kim, Yong-Kul Lee
Summary: NiMoS and CoMoS catalysts were synthesized and applied to the hydrotreating (HDT) of FCC light cycle oils (FCC-LCO) at 613 K and 8.6 MPa H-2. The individual and competitive reactivities of sulfur (S) and nitrogen (N) compounds in the HDS and HDN reactions were investigated using S and N model compounds. The NiMoS catalyst showed better activity in the HDN of LCO and HDS of LCO compared to the CoMoS catalyst.
Article
Environmental Sciences
Wonjun Choi, Hyeonmin Jo, Jae-Wook Choi, Dong Jin Suh, Hyunjoo Lee, Changsoo Kim, Kwang Ho Kim, Kwan-Young Lee, Jeong-Myeong Ha
Summary: In this study, Ru-added transition metal catalysts were used for the mild hydrotreating of acid-rich biomass pyrolysis oil, leading to stabilization of the oil, reduction in acidity, and higher organic compound yields. Bimetallic catalysts showed good decarboxylation activity for the removal of carboxylic acids and were deemed suitable for feedstocks requiring suppression of organic reactant loss. The improved catalytic activity of Ru-added transition metals can be attributed to their high acid site densities and enhanced hydrogenation activities.
ENVIRONMENTAL POLLUTION
(2021)
Article
Energy & Fuels
Fabian S. Mederos-Nieto, Adid O. Santoyo-Lopez, Raul Hernandez-Altamirano, Violeta Y. Mena-Cervantes, Fernando Trejo-Zarraga, Guillermo Centeno-Nolasco, Edgar Ramirez-Jimenez
Summary: This study outlines the production of renewable fuels from castor bean seeds in two stages, first obtaining castor oil methyl esters through reactive extraction and then applying hydrotreating process. Experiments showed that under moderate operating conditions, a higher yield and product selectivity of the kerosene fraction can be achieved.
Article
Engineering, Environmental
Ilya V. Novikov, Dmitry V. Krasnikov, Vlada S. Shestakova, Iurii P. Rogov, Veronika A. Dmitrieva, Anastasia E. Goldt, Tanja Kallio, Albert G. Nasibulin
Summary: In this study, the effect of hydrogen on the synthesis and properties of single-walled carbon nanotubes (SWCNTs) was investigated. The results showed that hydrogen had a significant impact on the yield and conductivity of SWCNTs at different temperatures.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Dmitry A. Sukhorukov, Roman G. Kukushkin, Maria V. Alekseeva (Bykova), Olga A. Bulavchenko, Olesya O. Zaikina, Mikhail E. Revyakin, Maxim O. Kazakov, Vadim A. Yakovlev
Summary: This paper focuses on upgrading sewage sludge-derived pyrolysis oil through hydrotreatment using catalysts. The results show that effective heteroatom removal can be achieved, especially with the NiMoPS/Al2O3 catalyst at 400 degrees C. Additionally, the catalysts used in the process accumulate certain impurities, indicating the importance of selecting appropriate catalysts and construction materials for further study.
Article
Chemistry, Physical
Petr Straka, Josef Blazek, Daria Toullis, Tomas Ihnat, Pavel Simacek
Summary: This study compares the hydrotreating of petroleum distillates and a mixture containing rapeseed oil. It found that complete conversion of rapeseed oil and minimum aromatic hydrocarbon content in the products can be achieved under different reaction conditions, while sulfur content can be controlled within acceptable levels under appropriate reaction conditions.
Article
Chemistry, Physical
Mariya A. Kazakova, Yulia V. Vatutina, Alexander G. Selyutin, Igor P. Prosvirin, Evgeniy Yu. Gerasimov, Oleg Klimov, Alexander S. Noskov, Maxim O. Kazakov
Summary: An efficient strategy for synthesizing nanostructured composite supports for CoMoS hydrotreating catalysts is proposed. The synthesis involves the growth of multi-walled carbon nanotubes (MWCNTs) on alumina crystallites modified with Fe2Co nanoparticles. By varying the Fe2Co content, the morphology and structural characteristics of the MWCNT@Al2O3 supports can be adjusted. Comprehensive analysis using advanced techniques identifies the optimal content and structural characteristics of MWCNTs that positively impact the morphology of the sulfide component in the composite supports.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Thermodynamics
Shima Masoumi, Ajay K. Dalai
Summary: The study investigated the use of novel algae-derived activated carbon supported NiMo carbide catalysts for upgrading algal biocrude oil by hydrodeoxygenation, achieving a 94% oxygen reduction rate and high value in liquid hydrocarbon fuels.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Physical
Fengyue Sun, Lingyu Yang, Changle Yue, Yang Liu, Wenjing Bao, Yongxiao Tuo, Xiang Feng, Yukun Lu
Summary: This study utilized Strandberg-type polyoxometalate as pre-assembled molecular platforms to construct and regulate NiMoS active sites at the atomic level. O,P doping was performed to boost the number of active sites using a controllable sulfidation method, resulting in O,P-NiMoS nanoparticles with significant catalytic activity. This research provides a feasible strategy for the rational design of efficient electrocatalysts for renewable energy applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Hector de Paz Carmona, Eliska Svobodova, Zdenek Tisler, Uliana Akhmetzyanova, Katerina Strejcova
Summary: The addition of phosphorus enhances the hydrodesulfurization and hydrodenitrogenation efficiencies of sulfur-free molybdenum carbide catalysts, showing promising activity under industrial conditions and commercial feedstocks. This study paves the way for developing a suitable and sulfur-free alternative to conventional hydrotreating catalysts.
Article
Chemistry, Inorganic & Nuclear
Xiaolong Guo, Xinyu Zhang, Yong Wu, Yuci Xin, Dongmei Li, Yuxin Zhang, Peng Yu
Summary: Spinel copper cobaltite (CuCo2O4), as a bifunctional oxygen electrocatalyst, has attracted significant research interest due to its tailored electronic structure and adjustability of active area. However, its poor oxygen evolution reaction (OER) performance hinders its practical use in rechargeable zinc-air batteries. Therefore, researchers have constructed a CuCo2O4/NiFe LDH oxide/hydroxide interface to enhance OER activity and reduce charging overpotential. The achieved electrocatalysts show improved OER performance, resulting in high round-trip efficiency and low voltage gap in zinc-air batteries.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Analytical
Qingquan Hao, Zailing Yang, Bencheng Wu, Jianhua Zhu, Zhi Li, Jinlong Liu, Ling Ma
Summary: The deactivation mechanism of a nickel-based catalyst in the hydrotreating of waste plastic pyrolysis oil (WPPO) was investigated. It was found that the deactivation of the catalyst was related to the presence of chlorides, nitrides, and sulfides in WPPO. Chlorine from chlorides reacted with active sites on the catalyst, causing sintering and loss of active components. Additionally, the formation of NH4Cl crystals reduced the surface area and pore volume of the catalyst, leading to rapid deactivation.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Chemistry, Physical
Gwang-Nam Yun, Ki-Duk Kim, Yong-Kul Lee
Summary: A highly dispersed nickel phosphide catalyst supported on SBA-15 was prepared and tested for the hydrotreating of tire pyrolysis oil. The catalyst showed high HDS and HDN conversion rates, comparable to a commercial NiMoS catalyst under the same conditions, indicating its potential for use in industrial applications.
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)
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)