Article
Engineering, Environmental
Dandan Zhu, Shucheng Di, Zuliang Wu, Shuiliang Yao, Jing Li
Summary: A new type of MnOx/γ-Al2O3 catalyst was designed for plasma catalytic oxidation of o-xylene. The results showed that the catalyst could efficiently degrade o-xylene and produce CO2 with high selectivity under specific reaction conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
E. Golubina, T. N. Rostovshchikova, E. S. Lokteva, K. Maslakov, S. A. Nikolaev, M. Shilina, S. A. Gurevich, V. M. Kozhevin, D. A. Yavsin, E. M. Slavinskaya
Summary: The study reveals that the surface coverage of alumina with Pt nanoparticles plays a crucial role in the efficiency of CO oxidation catalyst. Decreasing the number of Pt particle layers enhances the activity of CO oxidation, with Pt-0 dominating in multilayer catalysts.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yu Yang, Gang Wang, Mei Yang, Huanhuan Yang, Meijia Liu, Falu Dang
Summary: The study demonstrated that electronic modulation between Pd and Pt improved the catalytic activity and resistance to poisoning, preventing the deactivation of Pd active components.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Mauro E. Silva, Maira O. Palm, Diego A. . Duarte, Rafael C. Catapan
Summary: Here, the synthesis of Pt/Al2O3 catalysts on a monolithic foam using the competitive impregnation method is described. NO3- was employed as a competitive adsorbate to delay Pt adsorption and minimize Pt concentration gradients. Various characterization techniques were applied to evaluate the catalysts, including BET, H2-pulse titration, SEM, XRD, and XPS. The catalytic activity of the samples was assessed in partial oxidation and autothermal reforming of ethanol. The competitive impregnation method led to better dispersion of Pt particles and showed promising results in synthesizing well dispersed Pt catalysts over alpha-Al2O3 foams.
Article
Energy & Fuels
Xuxu Zhai, Fangli Jing, Luming Li, Xia Jiang, Junjun Zhang, Jun Ma, Wei Chu
Summary: A series of layered manganese oxides catalysts were successfully prepared by self-driving combustion (SDC) technology using potassium permanganate and citric acid as precursors. Noble metals were employed to modulate the obtained manganese oxide matrix, resulting in new nanocatalysts with improved catalytic performance, with 0.5Pt-SDC-13 exhibiting the highest activity.
Article
Chemistry, Physical
Jing Lin, Taojin Wang, Jiali Zhou, Xiaodong Wu, Ziran Ma, Shuang Liu
Summary: In this study, a Pt@TiOx/TiO2 catalyst modified by silica (Pt@TiSi) with super-hydrophilic surface and metallic platinum sites was synthesized to investigate the reasons behind the steam-accelerated C3H6 combustion over supported platinum. In situ spectroscopy analyses confirmed the involvement of water chemically to accelerate the reactions. Comparing the water response and kinetics of the silica-modified and unmodified samples, a water-mediated O2 adsorption and activation pathway (HOH center dot center dot center dot OO* -> OOH*) was identified as the origin of the activity bonus induced by steam. The Pt@TiSi catalyst exhibited significantly enhanced C3H6 oxidation activity in the presence of moisture due to the formation of OOH* at the interface between platinum and the hydrophilic supports (e.g., TiOx-SiO2).
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Xue Zong, Dionisios G. Vlachos
Summary: In this study, a structure-descriptor-based microkinetic model was built to investigate the relationship between nanoparticle structure and reaction kinetics. It was found that a volcano-like rate with an optimum coordination number exists during the methane oxidation on Pt. This methodology enables rapid prediction of kinetic performance, active site determination, and assessment of data quality for experimental outliers.
Article
Multidisciplinary Sciences
Huan Yan, Kun He, Izabela A. Samek, Dian Jing, Macy G. Nanda, Peter C. Stair, Justin M. Notestein
Summary: The study demonstrated that growing In2O3 over Pt/Al2O3 using atomic layer deposition results in a nanostructure that kinetically couples domains through surface hydrogen atom transfer, improving the selective oxidative dehydrogenation of propane. In contrast, other nanostructures, such as Pt on In2O3 or Pt mixed with In2O3, were unable to organize the reactions effectively, resulting in more propane combustion.
Article
Environmental Sciences
Qifeng Zhang, Jiyuan Liu, Chen Wang, Yanglong Guo, Wangcheng Zhan, Li Wang, Xueqing Gong, Yun Guo
Summary: Adjusting the interaction between Pt and CeO2 can improve the catalytic performance of supported Pt catalysts in the combustion of chlorinated volatile organic compounds (CVOCs). Weak interactions lead to higher activity, while strong interactions result in lower ability to remove chlorine species.
Article
Chemistry, Physical
Elena M. Slavinskaya, Lidiya S. Kibis, Olga A. Stonkus, Dmitry A. Svintsitskiy, Andrei I. Stadnichenko, Elizaveta A. Fedorova, Anatolii V. Romanenko, Vasyl Marchuk, Dmitry E. Doronkin, Andrei I. Boronin
Summary: The dependence of NH3 oxidation on the state and dispersion of Pt species in Pt/γ-Al2O3 catalysts was investigated. Prereduced Pt/γ-Al2O3 catalysts with Pt-0 nanoparticles exhibited significantly higher activity, with the most significant improvement observed when Pt-0 particle size increased. Introduction of H2O and CO2 moderately influenced NH3 oxidation activity.
Article
Energy & Fuels
Ivan Pedroarena, Lucia Grande, Jonathan J. Torrez-Herera, Sophia A. Korili, Antonio Gil
Summary: This research investigates the interactions between alumina-supported nickel catalysts and other metals, and their impact on the catalyst's performance. The reduction capacity of oxide phases has been analyzed, revealing that Pd facilitates the formation of easily reducible NiO species. Furthermore, the impregnation order of Mo and Pd does not significantly affect the catalysts' properties.
Article
Engineering, Environmental
Tianxu Shen, Jingcun Yan, Xiao Zhu, Lulu Wang, Laihong Shen
Summary: MFB-TGA is a micro fluidized bed thermogravimetric analysis technique with high accuracy and stability, which has the potential for extensive application in evaluating catalytic combustion and deducing oxidation mechanisms, oxygen migration pathways, and combustion kinetics. The measurement stability of MFB-TGA is influenced by various factors such as temperature distribution and gas disturbance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Ji Mei, Yao Shen, Yuanming Li, Shihan Zhang, Yi Shen, Wei Li, Zhuowei Cheng, Jingkai Zhao, Jianrong Chen
Summary: This work focused on the development of Fe-Mn oxide catalysts for the catalytic combustion of volatile organic compounds. Among the synthesized catalysts, Fe3Mn1-RP exhibited excellent activity for the elimination of o-xylene. The catalyst showed superior performance due to its large specific surface area, good reducibility, high proportion of Mn4+, and the presence of oxygen vacancies generated by high iron contents. Density functional theory calculations were also conducted to understand the crystal structures, surface electron density distributions, and adsorption sites of the catalysts, providing a detailed mechanism for o-xylene oxidation.
Article
Nanoscience & Nanotechnology
Dengji Xu, Guanwudi Huang, Li Guo, Yanjun Chen, Chao Ding, Changcheng Liu
Summary: Polyethylene (PE) is a major component of waste plastics with slow natural degradation. Incineration and thermolysis are effective methods for plastic waste treatment. The addition of catalysts like MCM-41 can control burning efficiency and reduce fire risks. HZSM-5 is the most effective catalyst for the conversion of PE to aromatic hydrocarbons.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Materials Science, Ceramics
Yifan Du, Bolin Wen, Ronglu Shu, Liping Cao, Wei Wang
Summary: Potassium titanate whiskers synthesized on cordierite ceramics showed excellent catalytic performance in reducing the soot combustion temperature, with potential applications in diesel particulate filters. The unique microstructure with improved trapping ability could enhance the catalytic combustion efficiency of carbon in DPF systems.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Jamie Whelan, Marios S. Katsiotis, Samuel Stephen, Gisha E. Luckachan, Anjana Tharalekshmy, Nicoleta Doriana Banu, Juan-Carlos Idrobo, Sokrates T. Pantelides, Radu V. Vladea, Ionut Banu, Saeed M. Alhassan
Article
Green & Sustainable Science & Technology
Anca Madalina Dumitrescu, Ionut Banu, Gheorghe Bumbac
Article
Green & Sustainable Science & Technology
Ionut Banu, Gheorghe Bumbac, Dorin Bombos, Sanda Velea, Ana-Maria Galan, Grigore Bozga
Article
Chemistry, Physical
Rami Doukeh, Daniela Popovici, Ancuta Trifoi, Mihaela Bombos, Ionut Banu
REACTION KINETICS MECHANISMS AND CATALYSIS
(2020)
Article
Chemistry, Multidisciplinary
Rami Doukeh, Cristian Leostean, Ion Bolocan, Ancuta Roxana Trifoi, Ionut Banu
Summary: The study investigated the effect of rhenium on the performance of CoMoNi/gamma-Al2O3 catalyst in thiophene hydrodesulphurization. It was found that the CoMoNiRe/gamma-Al2O3 catalyst exhibited superior activity due to higher acidic functional groups. A kinetic model based on the Langmuir-Hinshelwood approach was developed, considering two types of active centers, with statistical reasons supporting the model's adequacy in representing experimental results.
Article
Engineering, Chemical
Ionut Banu, Alma-Valentina Brosteanu, Gheorghe Bumbac, Grigore Bozga
Summary: This review article examines the thermodynamics of ethanol conversion to 1,3-butadiene, showing that equilibrium ethanol conversions up to 80% can be achieved even with positive standard Gibbs free energy changes. The inclusion of secondary products in the calculation schemes reduces the process yield at equilibrium, indicating kinetic control. Additionally, the process of producing butadiene from an ethanol-acetaldehyde mixture is slightly favored thermodynamically compared to direct ethanol conversion.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Gheorghe Bumbac, Ionut Banu
Summary: This study investigates the feasibility of converting glycerol into solketal and proposes an industrial-scale process design based on a catalytic distillation dividing wall column structure, demonstrating technical feasibility, high glycerol conversion rate, and high purity of the solketal product.
Article
Multidisciplinary Sciences
Catalina Calin, Cristian Leostean, Ancuta Roxana Trifoi, Elena-Emilia Oprescu, Elizabeth Wiita, Ionut Banu, Rami Doukeh
Summary: The study investigated the hydrodesulfurization of thiophene compounds using CoMo/gamma-Al2O3 and CoMo/gamma-Al2O3-Nb2O5 catalysts. The addition of Nb2O5 showed positive effects on enhancing the catalyst's surface area and acidity, leading to improved hydrodesulfurization activity for thiophene, 2-ethylthiophene, and benzothiophene. Additionally, a mutual inhibition effect was observed between sulfur compounds in the reaction, with Nb2O5 mitigating this inhibition effect to a certain extent.
SCIENTIFIC REPORTS
(2021)
Article
Food Science & Technology
Alin Cristian Nicolae Vintila, Alexandru Vlaicu, Elena Radu, Mihaela Ciltea-Udrescu, Emanuela Cristina Enascuta, Ionut Banu, Elena-Emilia Oprescu
Summary: This study investigated the effect of ultrasound assisted irradiation on the extraction of carotenoids and lipids from Chlorella vulgaris and Porphyridium purpureum microalgae. The results showed that the use of mixed solvents led to higher extraction efficiencies, and that the solvent polarity, composition, and solvent/sample ratio all impacted the extraction efficiency.
JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Elena-Emilia Oprescu, Emanuela Cristina Enascuta, Gabriel Vasilievici, Nicoleta Doriana Banu, Ionut Banu
Summary: The present study evaluated the adsorption efficiency and capacity of magnetic biochar derived from corn stalk for nitrate removal. The effects of various parameters on the adsorption process were investigated and the experimental data showed high nitrate removal efficiency. Response Surface Methodology was used to study the adsorption capacity and the optimal conditions were validated by experimental data.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2022)
Article
Green & Sustainable Science & Technology
Andrei Iulian Slabu, Ionut Banu, Octavian Dumitru Pavel, Florina Teodorescu, Raluca Stan
Summary: In this study, renewable products were synthesized by functionalizing linseed oil through epoxidation and epoxy ring-opening with carboxylic acids and anhydrides. LDHs (Layered Double Hydroxides) were used as catalysts, offering the advantages of easy separation and reusability. Different carboxylic acids and anhydrides were employed, leading to sustainable products that can replace petrochemical compounds. Under optimized reaction conditions, a nearly complete conversion of epoxy groups was achieved for all ring-opening reagents at 170 degrees Celsius.
Article
Chemistry, Physical
Rami Doukeh, Maria Rapa, Ecaterina Matei, Doina Prodan, Romuald Gyorgy, Ancuta Trifoi, Ionut Banu
Summary: Researchers prepared a tungstophosphoric acid catalyst supported on silica-coated magnetite nanoparticles for the condensation reaction of benzaldehyde and glycerol to produce cyclic acetals. The catalyst was characterized using various physicochemical techniques. The effect of process parameters such as glycerol/benzaldehyde molar ratio, temperature, and catalyst amount on glycerol conversion and product selectivity was studied. Using the Box-Behnken design methodology, the optimal conditions for the reaction were determined. The catalyst also exhibited excellent activity for glycerol acetalization with other aromatic aldehydes.
Article
Chemistry, Multidisciplinary
Ionut Banu, Grigore Bozga, Gheorghe Bumbac, Alin Vintila, Sanda Velea, Ana-Maria Galan, Mihaela Bombos, Olimpiu Blajan, Augustin Constantin Crucean
Article
Chemistry, Multidisciplinary
Alin Alexandru Enache, Laurent David, Jean-Pierre Puaux, Ionut Banu, Grigore Bozga
UNIVERSITY POLITEHNICA OF BUCHAREST SCIENTIFIC BULLETIN SERIES B-CHEMISTRY AND MATERIALS SCIENCE
(2018)
Article
Chemistry, Multidisciplinary
Rami Doukeh, Ancuta Trifoi, Mihaela Bombos, Ionut Banu, Minodora Pasare, Ion Bolocan
Article
Engineering, Chemical
Andrea Coletto, Pietro Poesio
Summary: Experiments and simulations were conducted to study the air volume fraction and hold-up in a bubble channel reactor. A new signal processing method was proposed to avoid the loss of bubble residence time. The results were in agreement with previous studies and a bubble-scale model was developed to explain the relationship between hold-up and air superficial velocity.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2024)
