Article
Materials Science, Multidisciplinary
Yang Wang, Sai Chen, Jiachen Sun, Yufei Xie, Zhi-Jian Zhao, Chunlei Pei, Jinlong Gong
Summary: This paper investigates the roles of V-O sites on propane dehydrogenation (PDH) over supported monomeric VOx species. Results show that the V-O-S site plays a decisive role in PDH, while V-OH and V=O sites have minimal influence. Additionally, ZrO2 exhibits higher specific activity due to the discrepant Lewis acidity of different V-O-S sites.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Melissa C. Cendejas, Rick W. Dorn, William P. McDermott, Edgard A. Lebron-Rodriguez, Lesli O. Mark, Aaron J. Rossini, Ive Hermans
Summary: The study focused on the controlled grafting synthesis of pinacolborane on amorphous silica, revealing that the silica pretreatment dehydration temperature can control the formation of hydrogen bonds. Thermal treatment under vacuum showed that boron on the silica surface is highly mobile at elevated temperatures, and the catalysts exhibited expected activity. However, the kinetic behavior of these supported catalysts deviates from that of bulk boron materials, prompting further research into reaction kinetics.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Review
Chemistry, Multidisciplinary
Daniyal Kiani, Sagar Sourav, Yadan Tang, Jonas Baltrusaitis, Israel E. Wachs
Summary: This review focuses on recent fundamental insights into methane dehydroaromatization (MDA) to benzene over ZSM-5-supported transition metal oxide-based catalysts. It critically analyzes the findings from MDA catalysis literature, emphasizing in situ and operando spectroscopic characterization to understand molecular level details regarding catalytic sites before and during the MDA reaction. Specific aspects discussed include anchoring sites of supported MOx species on ZSM-5 support, nature of active sites during MDA, reaction mechanisms, rate-determining step, kinetics and catalyst activity. Future experimental investigations to address gaps in the literature are also suggested.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Spectroscopy
Elliot J. Tay, Jonathan E. Barnsley, Daniel B. Thomas, Keith C. Gordon
Summary: Resonance Raman spectroscopy was used to identify and characterize psittacofulvins, showing different behaviors in red and yellow regions with Raman band wavenumber shifts. One yellow region exhibited similar characteristics to the red regions, suggesting the presence of psittacofulvins with greater conjugation.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Optics
Masashi Ono, Masahiro Takata, Masashi Shirata, Tatsuya Yoshihiro, Takeharu Tani, Masayuki Naya, Toshiharu Saiki
Summary: The study demonstrates self-adaptive control of IR absorptivity/emissivity in a simple stacked structure, showing potential applications for thermal emission structures.
Review
Chemistry, Multidisciplinary
Christian Hess
Summary: Raman spectroscopy is a powerful vibrational spectroscopic technique that has been widely used for the characterization of catalysts and catalytic reactions. It provides important information on catalyst structures, adsorbates, and reaction intermediates, offering key insights into studying working catalysts.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Physical
Thu D. Nguyen, Weiqing Zheng, Fuat E. Celik, George Tsilomelekis
Summary: The study found that incorporating CeO2 into the support changed the interaction patterns between MoOx catalysts and the support, enhanced the reoxidation effect of the oxidant CO2, and promoted the oxidative dehydrogenation pathway of ethane.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Anna Zabilska, Adam H. Clark, Davide Ferri, Maarten Nachtegaal, Oliver Kroecher, Olga Safonova
Summary: In situ X-ray absorption spectroscopy is a powerful technique for investigating catalysts, but intense X-ray irradiation can induce changes in metal species and corresponding XAS spectra. This study found X-ray induced photochemical reduction in catalysts and suggests approaches to mitigate this effect.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ashutosh K. Singh, Maedeh Pahlevaninezhad, Nael Yasri, Edward P. L. Roberts
Summary: The charge-discharge operation of vanadium redox flow batteries leads to electrode degradation, affecting performance and efficiency. The study shows that electrode degradation is more pronounced in the negative electrode, with differences in mechanism between positive and negative electrodes. Analysis of Raman mapping and X-ray photoelectron spectroscopy reveals changes in surface oxygen functional groups after degradation, indicating differences in degradation mechanism between the two electrodes.
Review
Instruments & Instrumentation
Juan Francisco Flores-Aguilar, Israel Samuel Ibarra, Alfredo Guevara-Lara, Isai Vazquez-Garrido
Summary: This review investigates the effect of catalysts on the infrared band shift and molybdenum polymerization degree in NiMoS active phases, focusing on the impact of different oxides replacing alumina as the support.
APPLIED SPECTROSCOPY REVIEWS
(2023)
Article
Materials Science, Ceramics
Shannon E. Murray, Guangxin Lv, Soumitra S. Sulekar, David G. Cahill, Daniel P. Shoemaker
Summary: Flash sintering is established as a method to rapidly densify or induce phase transformation in materials through applying an electric field. In this study, in situ Raman spectroscopy was used to investigate defect complexes and phase transformations during flash sintering. The fast characterization demonstrated in this work can be combined with well-developed models to elucidate the densification mechanism during flash sintering.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Eleni Tella, Antonios Trimpalis, Athanasios Tsevis, Christos Kordulis, Alexis Lycourghiotis, Soghomon Boghosian, Kyriakos Bourikas
Summary: Vanadia/titania catalysts were synthesized using the equilibrium deposition filtration method, allowing for controlled formation of specific vanadia species on the titania surface. This may result in different catalytic behaviors for specific reactions, depending on synthesis conditions. Raman spectroscopy was used to verify solution speciation and monitor temperature-dependent evolution of the deposited oxo-V(V) species.
Article
Chemistry, Physical
Namgi Jeon, Okkyun Seo, Jungmok Oh, Jisu Park, Iljun Chung, Jaemyung Kim, Osami Sakata, Akhil Tayal, Yongju Yun
Summary: The presence of V component enhances the catalytic performance of alumina-supported Co-V oxide catalysts for propane dehydrogenation by improving the reducibility of Co nanoparticles and increasing the surface concentration of metallic Co species. The results suggest that V component plays a significant role in modifying the properties of Co oxides and improving their catalytic performance.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Physical
Abdalla Hroub, Mohamad Hasan Aleinawi, Maria Stefan, Maria Mihet, Alexandra Ciorita, Feray Bakan-Misirlioglu, Emre Erdem, Arpad Mihai Rostas
Summary: In this study, vanadium (V)-doped MgO nanoparticles were used as electrode materials in all-in-one solid-state supercapacitors. The structural and morphological properties of the prepared samples were thoroughly analyzed using various techniques. The results showed that the V-doped MgO material displayed excellent capacitance performance and a maximum energy density of 4.17 Wh/kg. The addition of booster material like carbon black further enhanced the specific capacitance value to 1200 F/g, a value never reported before for MgO-based materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Sergio L. L. M. Ramos, Marcos A. Pimenta, Ana Champi
Summary: The study investigates the double-resonance Raman process in rhombohedral graphite and compares it with Bernal graphite, revealing that rhombohedral graphite exhibits a richer DR Raman spectrum due to its larger Brillouin zone volume. The 2D band of rhombohedral graphite is broader and shows different dispersive behavior compared to Bernal graphite. Additionally, the intervalley TO-LA band of rhombohedral graphite is broader and richer in features.