Article
Engineering, Chemical
Matias Alvear, Michele Emanuele Fortunato, Vincenzo Russo, Kari Eranen, Martino Di Serio, Juha Lehtonen, Sari Rautiainen, Dmitry Murzin, Tapio Salmi
Summary: The study demonstrated the effective and selective epoxidation of ethylene using TS-1 catalyst with hydrogen peroxide. Different experimental conditions led to the production of varying byproducts, confirming the catalyst's stability and selectivity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Ewoud J. J. de Boed, Bryan J. Folmer, Min Tang, Baira Donoeva, Petra E. de Jongh
Summary: The epoxidation of propene without forming byproducts is a difficult task in catalysis. This study investigates the influence of different metal oxide supports on the reaction and reveals that strongly acidic supports promote the isomerization of the propene oxide, while inert or neutralized surface sites, low specific surface area, and/or low density of surface -OH groups are key factors for achieving high selectivity.
Article
Chemistry, Multidisciplinary
Jingzhao Ren, Liancheng Wang, Penghui Li, Xiangying Xing, Huixiang Wang, Baoliang Lv
Summary: Linear terminal olefin epoxidation is an important oxidation reaction. In this study, bowl-shaped gamma-Al2O3-supported silver catalysts were synthesized and their catalytic performance in the epoxidation of 1-hexene was investigated. The results showed that the initiator promotes selective oxidation, and the variation in catalytic performance is attributed to the oxidized silver content.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Matias Alvear, Marie-Louis Reich, Kari Era''nen, Stefan Haase, Dmitry Yu. Murzin, Tapio Salmi
Summary: Epoxidation of butane isomers (1-butene and isobutene) on a commercial titanium silicate catalyst (TS-1) was studied in a trickle bed reactor using the transient step response technique. The study revealed different dynamics of product formation between the isomers. The molecular structure of the isomers impacted both the transient and stationary states of the system, with 1-butene displaying a dynamic behavior and isobutene behaving similarly to ethene and propene.
Article
Chemistry, Physical
Shoji Iguchi, Masashi Kataoka, Ryosuke Hoshino, Ichiro Yamanaka
Summary: Direct electro-epoxidation of C3H6 with water was successfully achieved using a solid polymer electrolyte (SPE) electrolysis cell. The Pt oxide species (Pt(ii) and Pt(iv)) were found to play a crucial role in the catalysis for electro-epoxidation of C3H6.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Dong Lin, Yang Xu, Xiuhui Zheng, Wei Sheng, Zhenyi Liu, Yinglong Yan, Yu Cao, Yibin Liu, Xiang Feng, De Chen, Chaohe Yang
Summary: Boosting the performance of direct propene epoxidation with H2 and O2 is achieved by regulating the microenvironment of active sites through sodium-decorated Au-Ti bifunctional active sites. The sodium-decorated silanols on the TS-1 support enhance the formation of Ti-OOH intermediates by restraining H2O2 decomposition. Additionally, sodium-decorated silanols improve the desorption of propylene oxide, suppressing its ring-opening and formation of carbonaceous deposits. Furthermore, sodium-decorated Au nanoparticles with smaller diameter and higher electron density strengthen O2 adsorption and boost H2O2 formation.
Article
Chemistry, Physical
Lindelani Ndlovu, David Lokhat, Deresh Ramjugernath
Summary: This study investigated the partial oxidation of hexafluoropropene over CuO catalyst using molecular oxygen. The catalysts were characterized, and the results confirmed the structure-reactivity correlation. The major products were hexafluoropropene oxide (HFPO) and carbonyl fluoride, with minor trifluoroacetyl fluoride produced when the catalyst had significantly declined in primary activity. The proposed redox mechanism kinetic model was in adequate agreement with the experimental data.
CATALYSIS COMMUNICATIONS
(2023)
Article
Endocrinology & Metabolism
Jonathan M. Ghergurovich, Xincheng Xu, Joshua Z. Wang, Lifeng Yang, Rolf-Peter Ryseck, Lin Wang, Joshua D. Rabinowitz
Summary: The research demonstrates that methionine synthase plays a crucial role not only in synthesizing methionine but also in preventing folate trapping and converting 5-methyl-THF into other folate species.
Article
Chemistry, Physical
Weinan Yang, Xiaoguang Zhao, Ya Wang, Rong Wang, Wenhao Yang, Yue Peng, Junhua Li
Summary: Single atom catalysts (SACs) have attracted much attention in heterogeneous catalysis for their high loading and unique catalytic properties. However, the migration and agglomeration of noble metal single atoms pose a challenge for achieving high loading. In this study, we synthesized a manganese oxide supported Pt SAC with a high loading using a selective dissolution strategy. The pre-stabilization of Pt by coordinated oxygen and the abundant surface defects of the support contribute to the high loading.
Article
Energy & Fuels
Adisak Guntida, Bunjerd Jongsomjit, Supareak Praserthdam, Piyasan Praserthdam
Summary: The deactivation of titanium catalysts supported by different preparation methods was studied during the epoxidation reaction. Wet impregnation (WI)-based catalysts showed better stability compared to those prepared by incipient wetness impreganation (IWI), and SBA-15 as a support showed higher stability than SiO2. Strong metal-support interactions in the 4Ti/SBA-15WI catalyst were found to reduce the catalyst deactivation caused by surface oxygen vacancies.
Article
Chemistry, Multidisciplinary
Jianyi Lei, Jiajun Dai, Kok Bing Tan, Jiale Huang, Guowu Zhan, Qingbiao Li
Summary: This study found that modified CuO supported on perovskites (LaCoO3) with NaCl displayed good catalytic activity for direct epoxidation of propylene. Specifically, LaCo0.8Cu0.2O3-δ showed the best catalytic performance at a lower temperature, with a high PO formation rate.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Samuel E. Michaud, Michael T. Riehs, Wei-Jie Feng, Chia-Cheng Lin, Charles C. L. McCrory
Summary: This study reveals that vanadium-doped cobalt oxide materials are not the active catalysts for the oxygen evolution reaction, but rather the vanadium-free material formed after dissolution of vanadium. Postmortem characterization is essential for the mechanistic and computational analysis of this class of materials.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Matias Alvear, Christoph Schmidt, Ole Reinsdorf, Edgard Lebron-Rodrigez, Abdullah Al Abdulghani, Ive Hermans, Markus Peurla, Mika Lastusaari, Kari Eranen, Dmitry Yu. Murzin, Narendra Kumar, Tapio Salmi
Summary: Titanium silicates of MWW structures with different Si/Ti ratios were prepared via hydrothermal synthesis and showed high crystallinity and MWW-like platelet morphology. The synthesized Ti-MWW materials exhibited higher surface areas and partial meso-porosity compared to the commercial TS-1 catalyst. In propylene epoxidation, the Ti-MWW materials showed significantly higher catalytic activities and enhanced selectivities compared to TS-1.
Article
Chemistry, Physical
Florin Matusoiu, Adina Negrea, Mihaela Ciopec, Narcis Duteanu, Petru Negrea, Paula Ianasi, Catalin Ianasi
Summary: This study develops a clean and effective process for the recovery of vanadium using the adsorption method, and synthesizes an adsorbent material with high surface area and pore volume. The mechanism of the adsorption process is determined to be physical, endothermic, and spontaneous through kinetic, thermodynamic, and equilibrium studies.
Article
Chemistry, Applied
Qian Gu, PingPing Jiang, Yirui Shen, Kai Zhang, Phyu Thin Wai, Agus Haryono
Summary: Highly dispersed molybdenum trioxide was loaded into three-dimensional dendritic mesoporous silica nanospheres (MoO3@3D-DMSNs) via a one-pot method. These MoO3@3D-DMSNs showed better catalytic performance for olefin epoxidation, with optimal conditions at a Mo/Si molar ratio of 5%. The catalysts maintained their activity and stability after five reaction-regeneration cycles, demonstrating good potential for catalytic reactions.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Chemistry, Physical
Agnieszka Held, Jolanta Kowalska-Kus, Krystyna Nowinska, Kinga Gora-Marek
JOURNAL OF CATALYSIS
(2017)
Article
Chemistry, Physical
J. Kowalska-Kus, A. Held, M. Frankowski, K. Nowinska
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
(2017)
Article
Chemistry, Physical
Agnieszka Held, Jolanta Kowalska-Kus, Krystyna Nowinska, Kinga Gora-Marek
Article
Chemistry, Physical
Agnieszka Held, Jolanta Kowalska-Kus, Yannick Millot, Frederic Averseng, Christophe Calers, Laetitia Valentin, Stanislaw Dzwigaj
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Chemistry, Physical
E. Janiszewska, J. Kowalska-Kus, K. Gora-Marek, A. Szymocha, K. Nowinska, S. Kowalak
APPLIED CATALYSIS A-GENERAL
(2019)
Article
Chemistry, Physical
Jolanta Kowalska-Kus, Agnieszka Held, Krystyna Nowinska
Article
Engineering, Environmental
J. Kowalska-Kus, A. Held, K. Nowinska
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Physical
Michal Zielinski, Monika Kot, Mariusz Pietrowski, Robert Wojcieszak, Jolanta Kowalska-Kus, Ewa Janiszewska
Summary: This study investigates the catalytic properties of iridium catalysts supported on modified silicalite-1. Post-synthesis modification of silicalite-1 with ammonium compounds was found to efficiently generate acidic sites and alter the porosity of the support. The catalytic activity of iridium supported on silicalite-1 treated with NH4OH was significantly higher than that of iridium supported on unmodified or NH4F-modified silicalite-1.
Article
Chemistry, Physical
A. Held, J. Kowalska-Kus, E. Janiszewska, A. Jankowska, K. Nowinska
Summary: The oxidation of propane to propene oxide over V-containing mesoporous silica of SBA-3 structure was studied using various oxidants. Characterization of fresh and spent catalysts was done using different techniques, revealing the stabilizing effect of using an N2O-oxygen mixture as an oxidant. The mixture led to stable catalyst activity and improved propane conversion and propene oxide production rates.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Agnieszka Held, Ewa Janiszewska, Justyna Czerepinska, Jolanta Kowalska-Kus
Article
Chemistry, Multidisciplinary
Ewa Janiszewska, Agnieszka Held, Krystyna Nowinska, Stanislaw Kowalak
