Article
Chemistry, Physical
Matthias Felischak, Tanya Wolff, Leo Alvarado Perea, Andreas Seidel-Morgenstern, Christof Hamel
Summary: Different metathesis catalysts were evaluated for propene production. The Re and NiRe based catalysts showed good activity and high propene selectivity at moderate temperatures, while the tungsten-based catalysts required higher temperatures for activity. Among them, Re/AlMCM-41(60), NiRe/mix (1:1) and W/SiO2 catalysts exhibited propene selectivity exceeding 40% and high potential for propene synthesis.
Article
Chemistry, Multidisciplinary
Heng Dai, Choongsze Lee, Wen Liu, Taimin Yang, Jakob Claret, Xiaodong Zou, Paul J. Dauenhauer, Xiujie Li, Jeffrey D. Rimer
Summary: Designing zeolite catalysts with improved mass transport properties is essential for networks with one- or two-dimensional pore topologies. Introducing fins can significantly enhance catalyst lifetime and selectivity, with confirmation of identical crystallographic registry between fins and seeds. Time-resolved titration of acid sites verifies the improved mass transport properties of ferrierite with fins compared to conventional analogues.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Yaewon Kim, Hamidreza Samouei, Christian Hilty
Summary: In this study, polymerization reactions of propene, 1-butene, and isobutene catalyzed by a specific catalyst were characterized using in situ NMR. The dissolved gases were hyperpolarized using the DNP technique, allowing for the observation of reaction kinetics and product formation. The study also revealed the impact of catalyst concentration and reaction time on the monomer signals, indicating a rapid binding and unbinding process during the reactions.
Article
Chemistry, Physical
Luis H. Molina-Conde, Alejandro Suarez-Mendez, Daniel E. Perez-Estrada, Tatiana E. Klimova
Summary: Ni/Al-MCM-41(x) catalysts with varying Si/Al ratios were synthesized and tested in the hydrodeoxygenation of anisole. The catalysts exhibited higher activities and selectivities compared to reference catalysts without Al. The optimal performance was achieved with the Ni/Al-MCM-41(90) catalyst, attributed to a synergistic effect between metal and acid sites.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Engineering, Chemical
Qihuan Yu, Duo Zhao, Yuhao Lv, Wendi Ma, Chuhao Chen, Guanghua Ye, Xinggui Zhou
Summary: Kinetics experiments were conducted to investigate the liquid-phase 1-butene hydroisomerization over a commercial Pd/Al2O3 catalyst. Three intrinsic kinetics models were proposed to describe the reaction rates. The results showed that the selectivity towards 2-butene increased with temperature, and the fraction of hydrogen in reactants significantly affected the conversion rate and selectivity. The single-site Langmuir-Hinshelwood model was found to be the most accurate in predicting the experiments.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Laura Loebbert, Saumil Chheda, Jian Zheng, Navneet Khetrapal, Julian Schmid, Ruixue Zhao, Carlo A. Gaggioli, Donald M. Camaioni, Ricardo Bermejo-Deval, Oliver Y. Gutierrez, Yue Liu, J. Ilja Siepmann, Matthew Neurock, Laura Gagliardi, Johannes A. Lercher
Summary: Grafting metal cations to missing linker defect sites in zirconium-based metal-organic frameworks can produce well-defined and homotopic catalytically active sites. This study focuses on the synthesis and characterization of a group of metal catalysts supported by UiO-66, which showed varying catalytic activities for alkene dimerization. The removal of molecular water from the active site significantly increased the catalytic activity for 1-butene dimerization, and density functional theory calculations provided a molecular level understanding of the differences in activity among different metal catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Jason P. Robbins, Lotanna Ezeonu, Ziyu Tang, Xiaofang Yang, Bruce E. Koel, Simon G. Podkolzin
Summary: This study reveals the higher activity and selectivity of the Ni Sn catalyst in propane dehydrogenation to propylene, with a lower temperature of propylene formation compared to the Ni catalyst. The differences in adsorption and desorption characteristics of propylene on Ni Sn and Ni catalysts may contribute to the change in reaction products.
Article
Chemistry, Physical
Karolina Jaroszewska, Marek Lewandowski, Kinga Gora-Marek, Jolanta Grzechowiak, Gerald Djega-Mariadassou
Summary: This study investigated the hydrodesulfurization activity of NiMo catalysts supported on mesoporous MCM-41 type materials shaped with binder. Ion exchange with protons of Al- or Ti-substituted MCM-41 mesoporous supports was found to increase the efficiency of direct desulfurization. The NiMo/HTiMCM-41 catalyst exhibited the highest catalytic efficiency in the HDS of 4,6-DMDBT and the diesel oil fraction, attributed to its appropriate acidity and desirable metal-support interaction.
Article
Chemistry, Applied
J. M. Fernandez-Morales, L. Martinez-Quintana, A. B. Dongil, E. Asedegbega, E. Castillejos, I. Rodriguez-Ramos, A. Guerrero-Ruiz
Summary: In this study, the conversion of 1-butene was investigated over Mo carbides and Ni, Co and Mo phosphides as catalysts, using a 1-butene/helium mixture in a molar ratio of 4:1. The conversion rate ranged from 30-44% and was relatively stable, except for certain catalysts. The main reaction observed was isomerization of 1-butene, with higher selectivity towards dimerization on certain catalysts.
Article
Chemistry, Physical
Chanon Auepattana-aumrung, Suttipong Wannapaiboon, Sippakorn Wannakao, Supareak Praserthdam, Bunjerd Jongsomjit, Joongjai Panpranot, Piyasan Praserthdam
Summary: In this study, metallosilicate catalysts were synthesized and characterized. The substitution of transition metals in zeolite structure was found to affect the 1-butene reaction, and the reduction reaction of the catalyst occurred on the metals. NH3-IR tests revealed the presence of two different Bronsted acid sites on the catalyst surface, which had different effects on the pathway of the 1-butene reaction.
MOLECULAR CATALYSIS
(2022)
Article
Energy & Fuels
Xiaoqiang Zhang, Hao Li, Yupeng Du, Xiaoping Chen, Pengzhao Wang, Lei Wang, Xiang Feng, Chaohe Yang, Shuo Li
Summary: This study investigates the isomerization mechanisms of butene under different acid strengths through density functional theory (DFT) calculations. The results show that acid strength significantly affects the isomerization mechanisms of butene. The stability of carbonium ions as reaction intermediates follows a specific order, and the reaction pathways of double bond and trans-cis isomerizations change with varying acid strength. This work provides mechanistic insights into the relationship among acid strength, type of butene, and quality of alkylate in the C4 alkylation process.
Article
Biotechnology & Applied Microbiology
Jeyashelly Andas, Siti Hajar Ekhbal, Tammar Hussein Ali
Summary: This study successfully prepared MCM-41 and modified MCM-41 from silica extracted from rice husk ash, and characterized the materials through various analytical techniques. Ni-MCM-41 showed higher catalytic activity with benzaldehyde as the sole product, while MCM-41 produced benzaldehyde and styrene oxide.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Multidisciplinary
Franklin J. Mendez, Roylena Vargas, Joel Blanco, Yahse Rojas-Challa, Ernesto Bastardo-Gonzalez, Jorge A. Garcia-Macedo, Esneyder Puello-Polo, Joaquin L. Brito
Summary: The study investigated the reactivity of Ti-modified MCM-41-supported NiMo and CoMo catalysts, showing that the incorporation of Ti can enhance the activity and selectivity of the catalysts, potentially beneficial for destabilizing sulfur-containing molecules.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Environmental Sciences
Ramya Ganesan, Shanthi Subramaniam, Ravichandran Paramasivam, Jamal S. M. Sabir, J. S. Femilda Josephin, Kathirvel Brindhadevi, Arivalagan Pugazhendhi
Summary: Biofuel is a novel solution to address the increase in greenhouse effect and energy demand. Catalytic cracking of non-edible vegetable oils was studied to produce gasoline range hydrocarbons, providing a new pathway for biofuel production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Applied
J. C. Bedoya, R. Valdez, L. Cota, M. A. Alvarez-Amparan, A. Olivas
Summary: In this study, mesoporous Al-MCM-41 nanospheres with variable sizes were successfully synthesized and characterized, showing hexagonal and mesoporous structure with the successful incorporation of Al ions. The smaller nanospheres exhibited more medium acidic sites on the surface. All samples displayed good selectivity towards DME, with the smallest nanospheres achieving 78% DME yield at 300 degrees C. The stability test revealed high DME yield (>60%) maintained during a 48-hour time-on-stream, indicating the potential for material recycling.
Article
Optics
Volker Lorenz, Phil Liebing, Markus Suta, Felix Engelhardt, Liane Hilfert, Sabine Busse, Sida Wang, Claudia Wickleder, Frank T. Edelmann
JOURNAL OF LUMINESCENCE
(2019)
Article
Chemistry, Inorganic & Nuclear
Nicole Harmgarth, Phil Liebing, Liane Hilfert, Volker Lorenz, Felix Engelhardt, Sabine Busse, Frank T. Edelmann
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2019)
Article
Chemistry, Multidisciplinary
Ramesh Duraisamy, Phil Liebing, Nicole Harmgarth, Volker Lorenz, Liane Hilfert, Martin Feneberg, Ruediger Goldhahn, Felix Engelhardt, Frank T. Edelmann
Article
Chemistry, Multidisciplinary
Phil Liebing, Frank T. Edelmann
HELVETICA CHIMICA ACTA
(2020)
Article
Chemistry, Inorganic & Nuclear
Phil Liebing, Nicole Harmgarth, Yi Yang, Robert McDonald, Felix Engelhardt, Marcel Kuhling, Frank T. Edelmann, Josef Takats
Summary: The synthesis and structural characterization of Ae(Tp(iPr2))(2) compounds (Ae = Mg, Ca, Sr, Ba) are reported, revealing significant structural variations compared to analogous Ln(Tp(iPr2))(2) compounds. Despite the structural differences, a linear size-dependence is observed for the bending angle between the B and metal ion for divalent metal ions from Mg2+ to Sm2+. The coordination geometry of the largest metal ion, Ba2+, differs from a linear metallocene-like structure due to significant tipping of the pyrazolyl groups towards the metal center.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Volker Lorenz, Phil Liebing, Liane Hilfert, Lea Schroeder, Frank T. Edelmann
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2020)
Article
Chemistry, Inorganic & Nuclear
Sida Wang, Phil Liebing, Felix Engelhardt, Liane Hilfert, Sabine Busse, Ruediger Goldhahn, Frank T. Edelmann
Summary: A series of new homoleptic first-row transition metal and yttrium tris(alkynylamidinate) complexes have been synthesized and characterized. A novel unsolvated lithium amidinate compound was isolated and structurally characterized. Two new potassium cyclopropylethinylamidinates were prepared by nucleophilic addition reactions. The metal complexes were readily obtained by reactions of metal precursors with the alkali metal cyclopropylethinylamidinates. An alternative synthetic route to a titanium(III) complex was discovered. The compounds were fully characterized using analytical and spectroscopic methods.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2022)
Article
Chemistry, Inorganic & Nuclear
Sida Wang, Phil Liebing, Felix Engelhardt, Liane Hilfert, Sabine Busse, Ruediger Goldhahn, Frank T. Edelmann
Summary: The current library of amidinate ligands has been expanded by synthesizing two novel dimethylamino-substituted alkynylamidinate anions. These compounds were used to study initial complexation reactions with selected transition metals.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Chemistry, Inorganic & Nuclear
Sida Wang, Phil Liebing, Martin Feneberg, Farid M. Sroor, Felix Engelhardt, Liane Hilfert, Sabine Busse, Elias Kluth, Rudiger Goldhahn, Frank T. Edelmann
Summary: A series of new alkynylamidinate complexes of selected first and second row transition metals has been synthesized and fully characterized. Different reactions were employed to obtain various binuclear complexes with different metal-metal bonding. The structures of all the compounds were determined using single-crystal X-ray diffraction and spectroscopic techniques.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Nicole Harmgarth, Phil Liebing, Volker Lorenz, Felix Engelhardt, Liane Hilfert, Sabine Busse, Ruediger Goldhahn, Frank T. Edelmann
Summary: This paper describes the synthesis of the first amidinate and amidine derivatives of p-carborane. The compounds were obtained through double lithiation of p-carborane followed by treatment with diorganocarbodiimides and chlorotrimethylsilane. The new compounds were characterized by X-ray diffraction.
Article
Chemistry, Inorganic & Nuclear
Ryan Johnson, Phil Liebing, Daniel P. Musikanth, Stuart A. Regitz, Donna S. Amenta, Ruediger Goldhahn, Frank T. Edelmann, John W. Gilje
Summary: The syntheses of two new ligands, L1 and L2, and their complexation with palladium(II) were investigated. L1 was best prepared using a Cs2CO3 catalyzed Michael addition, while L2 was synthesized catalyst- and solvent-free. Both ligands reacted with PdCl2(COD) to form the corresponding complexes. Crystal structures of the complexes were determined. An isomerization process was observed in complex 4. The ease of preparation and high yields make L1 and L2 potentially useful for further studies.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Chemistry, Inorganic & Nuclear
Volker Lorenz, Phil Liebing, Matthias Mueller, Liane Hilfert, Martin Feneberg, Elias Kluth, Marcel Kuehling, Magnus R. Buchner, Rudiger Goldhahn, Frank T. Edelmann
Summary: A series of brightly colored alkaline earth metal 1,3-dimethylviolurates have been synthesized and characterized. Different colored salts were obtained by neutralizing 1,3-dimethylvioluric acid monohydrate with corresponding metal dihydroxides. The study also discovered new compound structures and mixed-anion salts, expanding the coordination chemistry of violurates and related ligands.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Phil Liebing, Marcel Kuehling, Claudia Swanson, Martin Feneberg, Liane Hilfert, Ruediger Goldhahn, Tristram Chivers, Frank T. Edelmann
CHEMICAL COMMUNICATIONS
(2019)
Article
Chemistry, Inorganic & Nuclear
Phil Liebing, Nicole Harmgarth, Florian Zoerner, Felix Engelhardt, Liane Hilfert, Sabine Busse, Frank T. Edelmann
Article
Crystallography
Volker Lorenz, Phil Liebing, Liane Hilfert, Sabine Busse, Frank T. Edelmann
ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS
(2019)
Article
Chemistry, Physical
Yifan Sun, Ye Lv, Wei Li, Jinli Zhang, Yan Fu
Summary: In this study, PtRu electrocatalysts were fabricated on carbon paper via cyclic electrodeposition for the electrocatalytic hydrogenation (ECH) of phenol. The Pt3Ru3 catalyst exhibited excellent activity and stability for the conversion of phenol to cyclohexanol at ambient temperature and various current densities. The in situ Raman spectroscopy and kinetic study revealed the hydrogenation mechanism of phenol over Pt3Ru3 in acidic electrolyte, providing an effective electrochemical strategy for the facile construction of durable electrode materials and efficient phenol hydrogenation.
JOURNAL OF CATALYSIS
(2024)
Article
Chemistry, Physical
Amir Shahzad, Khezina Rafiq, Muhammad Zeeshan Abid, Naseem Ahmad Khan, Syed Shoaib Ahmad Shah, Raed H. Althomali, Abdul Rauf, Ejaz Hussain
Summary: Photocatalytic hydrogen production through water splitting is an effective method for meeting future energy demands. In this study, researchers synthesized a 1 % Ag2S/Cu2S co-doped CdZnS catalyst and found that it can produce hydrogen at a higher rate. The co-doping of Ag2S and Cu2S in the CdZnS catalyst showed a synergistic effect, with Ag2S promoting oxidation reactions and Cu2S promoting reduction reactions.
JOURNAL OF CATALYSIS
(2024)
