Article
Chemistry, Multidisciplinary
Fabio G. Delolo, Johannes Fessler, Helfried Neumann, Kathrin Junge, Eduardo N. Dos Santos, Elena Gusevskaya, Matthias Beller
Summary: A phosphine-oxide-promoted, cobalt-catalysed reductive etherification using syngas as a reductant has been reported in this study. This novel methodology has been successfully applied to prepare unsymmetrical ethers from a wide range of aldehydes and alcohols containing diverse functional groups, and the reaction has been scaled-up to multigram scale under relatively mild conditions. Mechanistic experiments suggest an acetalization-hydrogenation sequence.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Felipe Polo-Garzon, Thomas F. Blum, Zhenghong Bao, Kristen Wang, Victor Fung, Zhennan Huang, Elizabeth E. Bickel, De-en Jiang, Miaofang Chi, Zili Wu
Summary: The study reveals that during the catalytic conversion of 2-propanol on Pd/TiO2 at low temperatures, coverage of Pd sites occurs due to the generation of SMSIs. The SMSIs that appear during the reaction fully reverse upon exposure to O-2 at room temperature, which may have contributed to the challenge of identifying them in the past.
Article
Chemistry, Physical
Seung Yo Choi, Sun Hee Yoon, Unseock Kang, Dong Suk Han, Hyunwoong Park
Summary: The study successfully synthesized Ti/CFO/TiOx samples that can convert CO2 into formate under simulated sunlight, drive O2 evolution in the absence of electrical and chemical biases, achieving a solar-to-chemical energy conversion efficiency of 5%. The Ti underlayer plays a crucial role in creating a robust contact between CFO and substrates, while TiOx enhances electron transfer to CO2 adsorption sites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Yu Gao, Yuzhi Liu, Haiyang Yu, Donglei Zou
Summary: Entropy stabilized catalytic systems, specifically high entropy oxides (HEOs), have gained significant attention due to the demand for functional materials in chemical catalysis. This review provides an overview of the structural characteristics and recent applications of HEOs in thermal/electro/photo-catalysis and supports. Additionally, future prospects in environmental catalysis, such as visible light catalysis and catalytic wet air oxidation (CWAO), are proposed.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Yali Lv, Qing Yu, Xiaoling Mou, Ronghe Lin, Yunjie Ding
Summary: The structural evolution of classic coprecipitation-derived Mg-Al mixed oxide (MMO) upon doping of different alkali metals in a wide level (1-20 wt.%) was revisited in this study. The study found that alkali metal doping affects the surface characteristics and structure of MMO to a certain extent, with the dopant content and temperature having a significant impact on the evolution of MMO.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Tae Yong Yun, Bert D. Chandler
Summary: Surface hydroxyl groups on metal oxides have significant effects in catalyst synthesis and catalytic reactions, yet their broader material properties are not regularly reported. This study provides direct methods to quantify fundamental properties of surface hydroxyls on different titania- and alumina-based supports. The results show variations in surface hydroxyl density and intrinsic acidity/basicity among different titania sources, as well as the temperature effects on surface acid-base properties and isoelectric point changes.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Han-Ying Wu, Ye-Yan Qin, Yi-Hong Xiao, Jian-Shan Chen, Runping Ye, Rong Guo, Yuan-Gen Yao
Summary: The acid-base properties of supports have a significant impact on the selectivity and activity of supported catalysts. In this study, a series of Pd-X-UiO-66 (X = -NO2, -NH2, and -CH3) catalysts with different acidity/alkalinity functional groups and encapsulated Pd(II) species were developed and their activities in dimethyl carbonate (DMC) catalysis were investigated. The Pd-NO2-UiO-66 catalyst with acidity functionalization exhibited the best catalytic behavior, with a DMC selectivity of 68% and a CO conversion of 73.4%. The results showed that the -NO2 group not only affected the interaction between X-UiO-66 and Pd(II) active sites, but also played a crucial role in the adsorption and activation of MN and CO, promoting the formation of the COOCH3* intermediate and DMC product.
Review
Chemistry, Multidisciplinary
Xiang Sun, Huijun Chen, Yimei Yin, Matthew T. Curnan, Jeong Woo Han, Yan Chen, Zifeng Ma
Summary: This review focuses on utilizing renewable energy to convert small molecules into value-added chemicals through electro/thermal catalytic processes. Recently, oxides with exsolved metal nanoparticles have emerged as promising catalysts, providing new possibilities for the application of these processes. The performances of exsolution materials in various reactions are summarized, along with discussions on the challenges and future perspectives for their development as high-performance catalysts.
Article
Chemistry, Physical
Guilherme B. Strapasson, Leonardo S. Sousa, Gabriel B. Bafero, Davi S. Leite, Beatriz D. Moreno, Cristiane B. Rodella, Daniela Zanchet
Summary: Understanding the properties of metal oxides and their interaction with catalyst supports is crucial for developing highly active, selective, and stable catalysts. In this study, Pt-supported Ti-Nb mixed metal oxides were synthesized to modulate the acidity of the catalysts' surface. The catalyst with higher Bronsted acid sites showed enhanced stability and selectivity towards C-O bond cleavage in the acetone hydrodeoxygenation reaction. Important insights into the impact of acidity modulation and metal-support interaction on the catalytic performance were provided, along with the correlation between catalytic sites and reaction mechanism.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Xue-Rui Tian, Xiao-Lei Jiang, Sheng-Li Hou, Zhuo-Hao Jiao, Jie Han, Bin Zhao
Summary: This study investigates the influence of Lewis acid-base sites in catalysts on the chemical fixation of CO2. It demonstrates that with the introduction of Lewis base sites, the catalytic ability of a metal-organic framework (MOF) is improved, leading to enhanced efficiency in the conversion of CO2.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Inorganic & Nuclear
Elmehdi Moumen, Ayalew H. Assen, Karim Adil, Youssef Belmabkhout
Summary: Exploring the deployment of metal-organic frameworks (MOFs) in various applications is a growing research area, mainly driven by their high structural tunability. However, the fine-tuning of MOFs for structural properties-performance is often limited by their chemical and hydrolytic stability. Future directions will focus on how to design frameworks with long-term stability.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Engineering, Environmental
Yeon Jun Choi, Young Hwan Kim, Hyun-Kyung Kim, Kwang-Bum Kim
Summary: This study significantly improved the reversibility of the conversion reaction of Sn and Li2O to SnO2 by designing a SnO2/nanoperforated graphene composite as an anode material. The introduction of nanoperforations at contact points increased the interfacial area, leading to improved reversibility of the conversion reaction. The results provide important insights for the rational design of MOx-based anode materials for Li-ion batteries.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Chemistry, Physical
Rongji Liu, Carsten Streb
Summary: Single atom catalysts (SACs) anchored on molecular metal oxides (POMs) offer unrivalled possibilities for understanding complex systems on the atomic level. Research in this area focuses on energy conversion and storage technologies, but current limitations and potential future developments need to be addressed for further advancement in the field.
ADVANCED ENERGY MATERIALS
(2021)
Article
Energy & Fuels
Marina Ronda-Leal, Sameh M. Osman, Ho Won Jang, Mohammadreza Shokouhimehr, Antonio A. Romero, Rafael Luque
Summary: A TiO2-Fe2O3/C catalyst was successfully synthesized using Metal-Organic-Frameworks (MOFs) as the sacrificial template. It was applied in the hydrogenation of furfural to produce furfuryl alcohol, achieving high conversion and selectivity in a continuous flow reactor under microwave irradiation. This provides promising opportunities for the advancement of green chemistry.
Article
Chemistry, Physical
Walid Hamza Saadaoui, Cecile Machut, Sebastien Rio, Sandra Bigot, Vincent Wiatz, Eric Monflier, Anne Ponchel
Summary: The direct conversion of glucose to 5-hydroxymethylfurfural was investigated using phosphated niobium oxide-carbon catalysts in a biphasic system. A facile approach for generating Nb-based composites with high metal loadings (around 20%) was developed through hydrothermal carbonization, calcination, and H3PO4 adsorption. Catalysts were characterized through various techniques, and NbP@C-RB30 and NbP@C-RB15 prepared using oligosaccharides and low water volumes exhibited higher efficiency for HMF production.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Applied
M. Riad, S. Mikhail
JOURNAL OF ENERGY CHEMISTRY
(2015)
Article
Chemistry, Applied
S. Said, M. Riad, M. Helmy, S. Mikhail, L. Khalil
JOURNAL OF POROUS MATERIALS
(2017)
Article
Chemistry, Physical
R. Mohammed, Heba H. El-Maghrabi, Ahmed A. Younes, A. B. Farag, S. Mikhail, M. Riad
JOURNAL OF MOLECULAR LIQUIDS
(2017)
Article
Energy & Fuels
M. Riad, S. Mikhail
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2013)
Article
Chemistry, Applied
S. Mikhail, M. Riad
FUEL PROCESSING TECHNOLOGY
(2014)
Article
Chemistry, Physical
M. Riad, S. Mikhail
CATALYSIS SCIENCE & TECHNOLOGY
(2012)
Article
Chemistry, Inorganic & Nuclear
S. Said, M. Riad
SOLID STATE SCIENCES
(2019)
Article
Chemistry, Applied
E. H. Shamma, S. Said, M. Riad, S. Mikhail, A. E. H. Ismail
JOURNAL OF POROUS MATERIALS
(2020)
Article
Chemistry, Inorganic & Nuclear
S. Said, D. Aman, M. Riad, S. Mikhail
JOURNAL OF SOLID STATE CHEMISTRY
(2020)
Article
Environmental Sciences
E. Shamma, S. Said, M. Riad, S. Mikhail
Summary: Three-dimensional meso-porous Co3O4 was successfully prepared as a catalyst support using mesoporous silica as a template. The performance of the Co3O4 samples with different mole ratios was evaluated, and the 1 wt.% V2O5/m-Co3O4 catalyst showed promising activity and selectivity for the complete oxidation of aromatic volatile organic compounds.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
S. Said, Heba H. El Maghrabi, M. Riad, S. Mikhail
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2018)
Article
Engineering, Environmental
R. Mohamed, Heba H. El-Maghrabi, M. Riad, S. Mikhail
JOURNAL OF WATER PROCESS ENGINEERING
(2017)
Article
Chemistry, Multidisciplinary
S. Said, M. Riad, M. Helmy, S. Mikhail, L. Khalil
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2016)
Article
Chemistry, Multidisciplinary
Dalia R. Abd El-Hafiz, M. Riad, S. Mikhail
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2015)