Article
Energy & Fuels
Masoumeh Khanchi, Seyed Mohammad Ali Mousavian, Saeed Soltanali
Summary: The experimental results show that SiO2-Al2O3-based catalysts perform better than SiO2 and Al2O3-based catalysts, with the best performance observed at lower Si/Al ratios.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Viktor Ulrich, Boris Moroz, Pavel Pyrjaev, Ilya Sinev, Andrey Bukhtiyarov, Evgeny Gerasimov, Valerii Bukhtiyarov, Beatriz Roldan Cuenya, Wolfgang Gruenert
Summary: Three-way catalysts containing Au and/or Pd supported on CeZrOx (CZ) or La2O3/Al2O3 (LA) were studied for their performance in a model feed. The support material significantly influenced the catalytic behavior and Pd-Au relation. Pd-rich bimetallic combinations supported on CZ showed superior activity compared to other catalysts, while poisoning by Au was aggravated on LA after aging.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Silvia Mauri, Gianluca D'Olimpio, Corneliu Ghica, Luca Braglia, Chia-Nung Kuo, Marian Cosmin Istrate, Chin Shan Lue, Luca Ottaviano, Tomasz Klimczuk, Danil W. Boukhvalov, Antonio Politano, Piero Torelli
Summary: This study investigates the surface reactivity of a Ni3Sn4 catalyst operating at 250 degrees C for hydrogen production from methanol decomposition. It is found that the catalytic reaction is driven by surface tin-oxide phases, which enhance catalyst durability and H2 selectivity. These findings provide new perspectives for the development of scalable and low-cost catalysts.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Parasmani Rajput, Mangla Nand, Mukul Gupta, P. R. Sagdeo, A. Sagdeo, S. K. Sharma, A. A. Coelha, S. N. Jha, D. Bhattacharyya, Manvendra Kumar
Summary: In this study, ZnO, Zn0.94Co0.06O, and Zn0.94Co0.06O/ZnO heterostructure thin films were prepared using RF ion beam sputtering, with analyses conducted on their structural, optical, and magnetic properties. The results indicated a type-II band alignment in the studied system.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Mariia Merko, Sara Delsing, G. Wilma Busser, Martin Muhler
Summary: The non-oxidative dehydrogenation of methanol to formaldehyde offers potential advantages including the production of anhydrous formaldehyde and valuable hydrogen by-products. Supported GaOx catalysts showed promising catalytic performance, with fumed SiO2 identified as the more suitable support. The loading of Ga and coke deposition affected the formaldehyde production rate and the generation of by-products.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Fan Zhang, Xiaoying Xu, Zhengpu Qiu, Bo Feng, Yuan Liu, Aihua Xing, Maohong Fan
Summary: This study focused on the design and performance of Cu/ZnO/Al2O3 catalysts, finding that the catalyst derived from highly zinc-substituted malachite exhibited the best catalytic performance. The research also revealed the copper specific surface area and exposed copper concentration of the catalyst, as well as the Cu/ZnO synergy.
GREEN ENERGY & ENVIRONMENT
(2022)
Article
Chemistry, Physical
Uta Hejral, Janis Timoshenko, David Kordus, Mauricio Lopez Luna, Nuria J. Divins, Simon Widrinna, Ioannis Zegkinoglou, Lukas Pielsticker, Hemma Mistry, Jorge Anibal Boscoboinik, Stefanie Kuehl, Beatriz Roldan Cuenya
Summary: This study investigated the catalytic mechanism of NiGa alloys in CO2 hydrogenation. It was found that Ni3Ga1 and Ni5Ga3 nanoparticles formed different phases at different temperatures under H-2 activation. Under CO2 hydrogenation conditions, Ga partially oxidized to form Ga2O3. The Ni3Ga1 NPs showed high selectivity towards methane production, while the Ni5Ga3 NPs exhibited high selectivity towards methanol production, which was attributed to the presence of the S-Ni5Ga3 phase.
JOURNAL OF CATALYSIS
(2022)
Article
Materials Science, Ceramics
Zhanjun Wang, Bei Shen, Ming Zhong, Zushu Li, Cong Wang
Summary: The viscous behavior and structure of ternary SiO2-MnO-Al2O3 submerged arc welding fluxes were investigated in this study. The results showed that the viscosity increased with the substitution of MnO with Al2O3, indicating enhanced polymerization of the flux. The (Q(2)+Q(3)+Al-O-0)/(Q(0)+Q(1)+Al-O+AlO6) ratio confirmed the continuous polymerization of the flux structure.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Gi Hyun Kim, Il Sohn
Summary: The effects of alkali metal cations and fluoride anions on the viscosities and structures of high-temperature melts were investigated in this study. Substituting larger alkali metal cations increased viscosity and enhanced the degree of polymerization of the structural units. Substitution with alkali metal fluorides reduced viscosity but enhanced polymerization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Energy & Fuels
Artita Na Rungsi, Apanee Luengnaruemitchai, Nuwong Chollacoop, Shih-Yuan Chen, Takehisa Mochizuki, Hideyuki Takagi, Yuji Yoshimura
Summary: This study investigated the performance and sulfur poisoning of different Pd-Pt catalysts in the selective hydrogenation of soybean oil-derived fatty acid methyl esters (FAMEs). The results showed that catalysts with larger Pd-Pt alloy particles and weaker acidity favored the selective hydrogenation to produce monounsaturated esters, while catalysts with smaller Pd-Pt alloy particles and stronger acidity favored the formation of saturated esters. The performance of the catalyst physically mixed with acidic support γ-Al2O3 did not deteriorate when using a feedstock containing sulfur.
Article
Chemistry, Physical
Jun Zhang, Mei Cheng, Yi Jiao, Linlin Wang, Jianli Wang, Yaoqiang Chen, Xiangyuan Li
Summary: The synthesis of Pt nanoparticles loaded SiO2-Al2O3 catalyst (PSA-re) through modified colloid deposition method (CDM) resulted in improved stability and dispersion of Pt in the reaction. PSA-re exhibited high cracking activity and outstanding stability, attributed to abundant accessible Pt metal sites and appropriate acid sites distribution on the surface. Comparatively, the traditional catalyst (PSA-im) prepared by incipient wetness impregnation method (IWIM) showed lower performance.
APPLIED SURFACE SCIENCE
(2021)
Article
Energy & Fuels
M. A. Armenta, Luis H. Alvarez, V. M. Maytorena, D. A. Buentello-Montoya, R. Silva-Rodrigo, A. Olivas, L. A. Flores-Sanchez
Summary: The wet impregnation method was used to support Ag2O, CuO, and Ag2O-CuO nanoparticles on gamma-chi-Al2O3 to evaluate their catalytic capabilities in the methanol dehydration (MD) reaction for dimethyl ether (DME) production. The Ag2O-CuO/gamma-chi-Al2O3 catalyst showed high catalytic activity and stability.
Article
Spectroscopy
M. M. Gafurov, K. Sh Rabadanov, M. B. Ataev, A. M. Amirov, M. A. Akhmedov, N. S. Shabanov, Z. Yu Kubataev, D. Rabadanova
Summary: The paper presents a comprehensive study of Li0.42K0.58NO3-R and (LiNO3 - LiClO4) -γ-Al2O3 composite salt systems using various experimental techniques. It was found that solid fillers have different effects on orientational and vibrational relaxation processes in molten phases.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Physical
Joachim Thrane, Christopher Falholt Elvebakken, Mikkel Juelsholt, Troels Lindahl Christiansen, Kirsten M. O. Jensen, Lars Pilsgaard Hansen, Lars Fahl Lundegaard, Uffe Vie Mentzel, Max Thorhauge, Anker Degn Jensen, Martin Hoj
Summary: Molybdenum oxide supported on calcium or strontium hydroxyapatite was investigated as catalysts for selective oxidation of methanol to formaldehyde, showing high activity and selectivity, making it interesting for industrial production.
Article
Materials Science, Ceramics
Xiangtao Lin, Zhikai Wang, Xingxing Jiang, Tianxiang Ning, Yong Jiang, Anxian Lu
Summary: A new medical neutral boroaluminosilicate glass with thermal and chemical stabilities conforming to international standards has been successfully prepared. The study investigates the relationship between structure and physical and chemical properties, and finds that the increase of Al2O3 introduction leads to the continuous increase of octahedral proportion of [AlO6] and weakens the degree of glass network connection, resulting in higher thermal expansion coefficient and decreased chemical stability of the glass.
CERAMICS INTERNATIONAL
(2023)
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)