Article
Chemistry, Applied
Arturo Claudio-Piedras, Rosa Ma. Ramirez-Zamora, Brenda C. Alcantar-Vazquez, Albina Gutierrez-Martinez, Gilberto Mondragon-Galicia, Fernando Morales-Anzures, Raul Perez-Hernandez
Summary: The study synthesized Pt nanocatalysts supported on CeO2-NR for hydrogen production via the steam reforming of methanol. The choice of Pt precursor had an impact on the catalyst's performance, with Pt/CeO2-NR(Nit) showing the best methanol conversion rates. The stability of the catalyst during the reaction was confirmed by real-time monitoring analysis using Mass Spectroscopy.
Article
Chemistry, Applied
Fawei Lin, Xiao Jiang, Nuttakorn Boreriboon, Chunshan Song, Zhihua Wang, Kefa Cen
Summary: Binary supports such as TiO2-CeO2 and TiO2-ZrO2 significantly enhance CH3OH formation and selectivity, with Pd-Cu/Ti0.1Zr0.9O2 exhibiting the best catalytic performance. Lowering temperature further enhances CH3OH selectivity.
Article
Chemistry, Physical
Maria Cristina Campa, Giuseppe Fierro, Aidan M. Doyle, Simonetta Tuti, Carlotta Catracchia, Daniela Pietrogiacomi
Summary: Pt, Pd, and Rh supported on TiO2-ZrO2 and TiO2-ZrO2-CeO2 exhibit promising catalytic behavior for simultaneous selective catalytic reduction of NO and N2O, with CeO2 improving catalyst stability and activity.
SURFACES AND INTERFACES
(2023)
Article
Environmental Sciences
Nawel Jraba, Thabet Makhlouf, Gerard Delahay, Hassib Tounsi
Summary: The study involves the preparation and characterization of copper-loaded eta-alumina catalysts with different copper contents for catalytic reactions. Experimental results indicate that the impregnation/evaporation method is beneficial for highly dispersed copper oxide species on the surface at low copper contents. Wet impregnation allows for a well dispersion of copper species on the alumina surface for low copper contents, leading to similar catalytic performance in the selective catalytic oxidation of NH3.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Zhuping Li, Yong Men, Shuang Liu, Jinguo Wang, Keye Qin, Dandan Tian, Tianle Shi, Li Zhang, Wei An
Summary: The crystalline phases of support play a crucial role in the catalytic performance of heterogeneous catalysts. In this study, a series of Pd/In2O3/ZrO2 catalysts with different crystalline phases of ZrO2 were prepared and evaluated for CO2 hydrogenation to CH3OH. The results showed that the catalyst supported on mixed monoclinic and tetragonal phases ZrO2 exhibited superior reactivity compared to catalysts supported on single monoclinic or tetragonal ZrO2. The superior activity of the Pd/In2O3/Mix-ZrO2 catalyst could be attributed to its larger Pd particle size, higher concentration of oxygen vacancies, and abundant medium basic sites, which facilitated the activation of H-2 and inert CO2. The best-performing catalyst showed high stability and remarkable space time yield of methanol synthesis from CO2 hydrogenation.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Thaylan Pinheiro Araujo, Jordi Morales-Vidal, Georgios Giannakakis, Cecilia Mondelli, Henrik Eliasson, Rolf Erni, Joseph A. Stewart, Sharon Mitchell, Nuria Lopez, Javier Perez-Ramirez
Summary: Ternary Pd-In2O3/ZrO2 catalysts prepared by wet impregnation exhibit selective and stable architecture under CO2 hydrogenation conditions, irrespective of the order of addition of Pd and In phases on the zirconia carrier. The rapid restructuring of the catalysts is driven by the metal-metal oxide interaction energetics. The presence of InPdx alloy particles decorated by InOx layers prevents performance losses associated with Pd sintering.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Aizhe Han, Jie Ding, Qin Zhong
Summary: This study investigates the role of exchanged Pd in the Pd-Cu/ZrO2 catalysts for CO2 hydrogenation to methanol. It is found that the exchange promotes the methanol production rate by increasing the splitting H adsorptions on Cu species and strengthening the interactions between Cu species and oxygen vacancies at the interface, thus promoting the formations of Cu delta+ species.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Applied
Athanasia Tsoukalou, Alexander Serykh, Elena Willinger, Agnieszka Kierzkowska, Paula M. Abdala, Alexey Fedorov, Christoph R. Mueller
Summary: The formation and nature of surface indium species in zirconia-supported catalysts for CO2 hydrogenation to methanol were investigated. It was found that In2O3/m-ZrO2(redox) catalyst had the highest activity and concentration of surface indium sites capable of H-2 activation, making it the most promising catalyst for CO2 hydrogenation to methanol.
Article
Chemistry, Physical
M. R. Kosinski, A. J. Vizcaino, L. M. Gomez-Sainero, A. Carrero, R. T. Baker
Summary: Catalysts of 2 wt% Pd/Sm-doped Ceria were prepared and evaluated for hydrogen production by methanol reforming. Among the three preparation methods, Method B resulted in the best activity and CO2 selectivity due to the superior nanostructure of the catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Thomas Len, Mounib Bahri, Ovidiu Ersen, Yaya Lefkir, Luis Cardenas, Ignacio J. Villar-Garcia, Virginia Perez Dieste, Jordi Llorca, Noemie Perret, Ruben Checa, Eric Puzenat, Pavel Afanasiev, Franck Morfin, Laurent Piccolo
Summary: In Mo/TiO2 catalysts, the interaction between ultradispersed molybdate species and the support structure of rutile titanium nanorods plays a crucial role in achieving high activity and selectivity for methanol production.
Article
Engineering, Environmental
Yaddanapudi Varun, I. Sreedhar, Satyapaul A. Singh
Summary: In this study, Ni and La were successfully substituted and impregnated on Co3O4-ZrO2 nanocomposites. The results show that the substituted CZ catalysts exhibit better catalytic activity than the impregnated catalysts.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Magali S. Ferrandon, Carly Byron, Gokhan Celik, Yuying Zhang, Chaoying Ni, Jennifer Sloppy, Rachel A. McCormick, Karl Booksh, Andrew Teplyakov, Massimiliano Delferro
Summary: In this study, a large number of different combinations of catalysts were synthesized using a high-throughput method. Evaluation revealed that the type of oxide support has a significant impact on the activity and stability of the catalysts, and the optimal effects of different metal promoters on various metal oxide supports varied.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Silligandla Nazeer, Palli Sitaramulu, Kamma Yogendra, Palnati Manoj Kumar, Benjaram M. Reddy, Tumula Venkateshwar Rao
Summary: The present study focused on the production of vanillin from lignin-derived vanillyl alcohol using copper-doped ceria catalysts. The 10% Cu-doped ceria catalyst showed superior catalytic activity, achieving 95% and 100% conversions of vanillyl alcohol at atmospheric and moderate pressures, respectively, with 100% vanillin selectivity. Thorough characterization of the synthesized mesoporous oxides indicated that mixed oxide catalysts exhibited better redox behavior and higher oxygen vacancies, leading to improved catalytic activity and selectivity.
Article
Chemistry, Applied
J. Vera-Iturriaga, M. L. Hernandez-Pichardo, J. A. Montoya de la Fuente, P. Del Angel, D. Gomora-Herrera, E. Palacios-Gonzalez, L. Lartundo, L. A. Moreno-Ruiz
Summary: The study investigated the effect of TiO2 as an additive in the Pt/WO3-ZrO2 catalyst system on the catalytic activity of n-hexane hydroisomerization. It was found that the incorporation of TiO2 can promote the stabilization of active sites, leading to higher conversion rates and yields in the reaction.
Article
Chemistry, Physical
Nicola Schiaroli, Leila Negahdar, Mads Luetzen, Phuoc Hoang Ho, Lisa J. Allen, Alejandro Natoli, Francesca Ospitali, Francesco Maluta, Enrique Rodriguez-Castellon, Christian D. Damsgaard, Giuseppe Fornasari, Andrew M. Beale, Patricia Benito
Summary: We developed a highly dispersed Pd-In2O3-Al2O3 catalyst by one-step coprecipitation, calcination, and activation. This catalyst exhibits comparable activity with Pd-In2O3 catalyst but with reduced In2O3 loading and improved long-term stability.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Applied
Francisco Tzompantzi, J. C. Castillo-Rodriguez, C. Tzompantzi-Flores, Raul Perez-Hernandez, R. Gomez, C. E. Santolalla-Vargas, Gamaliel Che-Galicia, Esthela Ramos-Ramirez
Summary: ZrSn composites prepared by chemical co-precipitation method showed good photocatalytic degradation performance towards phenol under UV irradiation, with the composite containing 3 mol% SnO2 exhibiting the highest photoactivity. The proposed reaction mechanism suggests that ZrSn composites do not promote the formation of hydroxyl radicals, and the capture of holes and reduction of (center dot O2(-)) radicals leads to decreased photocatalytic activity. The formation of heterojunctions and presence of localized states in the synthesized composites offer an excellent alternative for fast photodegradation of phenol.
Article
Dentistry, Oral Surgery & Medicine
I. Mezquita-Rodrigo, R. J. Scougall-Vilchis, M. A. Moyaho-Bernal, L. E. Rodriguez-Vilchis, E. Rubio-Rosas, R. Contreras-Bulnes
Summary: Self-etching agents showed less pronounced etching patterns compared to conventional etching agents, and demonstrated equal or superior in vitro performance. The use of self-etching agents before pit and fissure sealants application can be recommended in new dental protocols. The best in vitro performance was observed when both the self-etching agent and pit and fissure sealant contained 10-methacryloyloxydecyl dihydrogen phosphate in their chemical composition.
EUROPEAN ARCHIVES OF PAEDIATRIC DENTISTRY
(2022)
Article
Chemistry, Applied
Jorge Reyna-Alvarado, Oscar A. Lopez-Galan, Manuel Ramos, Jose Rodriguez, R. Perez-Hernandez
Summary: Theoretical study on the catalytic mechanism for hydrogen production by methanol steam reforming over CeO2 and Ni/CeO2 surfaces suggests favorability of the process with metallic nickel contained. Enhancement in performance of Ni/CeO2 systems is attributed to the synergistic effect of CeO2 exposed nanorods and Ni clusters.
Article
Polymer Science
Wendy Abril Coyotl-Perez, Efrain Rubio-Rosas, Quetzali Nicte Morales-Rabanales, Sergio Alberto Ramirez-Garcia, Yesenia Pacheco-Hernandez, Victor Hugo Perez-Espana, Omar Romero-Arenas, Nemesio Villa-Ruano
Summary: This study demonstrated the effectiveness of chitosan hybrid films containing thyme essential oil in preventing soft rot caused by Clonostachys rosea in Hass avocadoes. The treated avocadoes maintained their firmness, nutritional composition, and nutraceutical content significantly better than the untreated ones for 21 days, suggesting the potential use of these films to improve the shelf life of Hass avocadoes.
Article
Materials Science, Multidisciplinary
F. Martinez-Agustin, S. Ruiz-Salgado, B. Zenteno-Mateo, E. Rubio, M. A. Morales
Summary: This work proposes a new mathematical model that describes the dynamic behavior of a ternary mixture composed of coupled Cahn-Hilliard and Swift-Hohenberg equations. The model reveals the phase transitions and patterns of glassy and crystalline phases in three dimensions. Furthermore, the model has practical applications in the manufacturing of porous polymeric materials.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Chemistry, Applied
G. Modragon-Galicia, M. Toledo Toledo, F. Morales-Anzures, P. Salinas-Hernandez, A. Gutierrez-Martinez, Ma. E. Fernandez Garcia, F. Tzompantzi, A. Barrera, J. Reyna-Alvarado, O. A. Lopez-Galan, M. Ramos, R. Perez-Hernandez
Summary: A study on the catalytic performance of Pt/Pd supported on ZnO rods for methanol steam reforming reaction (MSR) was conducted. The experimental and theoretical results showed that Pt/ZnO sample exhibited superior catalytic activity, and the stabilization of PdZn structure by Pt might be attributed to better catalytic performance due to the electron transfer from platinum into the zinc oxide support.
TOPICS IN CATALYSIS
(2022)
Article
Chemistry, Analytical
Miguel Angel Hernandez, Karla Quiroz-Estrada, Gabriela Hernandez-Salgado, Roberto Ignacio Portillo, Juana Deisy Santamaria-Juarez, Ma de los Angeles Velasco, Efrain Rubio, Vitalii Petranovskii
Summary: This paper investigates the isosteric enthalpy of CO2, CH4, and H-2 adsorption through narrow pores in natural chabazite exchanged with different concentrations of Na+, Mg2+, and Ca2+ salts. The results show that the exchange with Mg2+ and Na+ can enhance the adsorption capacity for CO2, while Ca2+ and Mg2+ promote adsorption of H-2 and CH4. These cations occupy strategic positions in the channels and nanocavities of the zeolites, resulting in increased adsorption in the nanocavities and on the external area of the ion-exchanged zeolites. The study concludes that Ca2+, Mg2+, and Na+ are favorable for CO2, CH4, and H-2 adsorption depending on the exchange treatment conditions.
Article
Chemistry, Physical
Oscar Javier Hernandez-Ortiz, Damaris Castro-Monter, Ventura Rodriguez Lugo, Ivana Moggio, Eduardo Arias, Maria Isabel Reyes-Valderrama, Maria Aurora Veloz-Rodriguez, Rosa Angeles Vazquez-Garcia
Summary: A p-conjugated polymer (PBQT) containing BDT units alternated with a quinoline-vinylene trimer was synthesized via the Stille reaction. The chemical structure was confirmed by NMR, FT-IR, and MALDI-TOF. PBQT exhibited photochromism and fluorescence change, making it suitable for optical sensors or switches. The polymer also showed potential for photovoltaic applications with its good energetic match and absorption properties.
Article
Chemistry, Physical
Angela G. Romero-Villegas, Clara Tzompantzi-Flores, Raul Perez Hernandez, Arturo Barrera-Rodriguez, Francisco Tzompantzi, Ricardo Gomez
Summary: In this study, a cadmium-modified layered double hydroxide support was synthesized using a one-pot coprecipitation method, followed by sulfuring at different percentages using a solvothermal method. The samples were then analyzed using various characterization techniques. The synthesized and uncalcined materials were tested for hydrogen production from both water and a methanol-water solution under UV-light irradiation. The results showed that sulphuration significantly improved the photocatalytic activity, with maximum rate constants of hydrogen production observed in the methanol-water solution and water.
Article
Chemistry, Analytical
Miguel Angel Hernandez, Gabriela Itzel Hernandez, Roberto Portillo, Efrain Rubio, Vitalii Petranovskii, Karin Montserrat Alvarez, Ma de los Angeles Velasco, Juana Deisy Santamaria, Mario Tornero, Laura Alicia Paniagua
Summary: The applicability of clinoptilolite zeolites in controlling greenhouse gas emissions, specifically CO2, was investigated using Mexican natural zeolites. Acid treatment of the starting material resulted in modified clinoptilolite samples with different adsorption properties. The adsorption of CO2 on these samples was studied at different temperatures and the interaction between CO2 and the dealuminated clinoptilolite samples was evaluated.
Article
Chemistry, Analytical
Miguel Angel Hernandez, Gabriela I. Hernandez, Roberto Ignacio Portillo, Ma de los angeles Velasco, Juana Deisy Santamaria-Juarez, Efrain Rubio, Vitalii Petranovskii
Summary: The N-2 and O-2 adsorption isotherms in chemically modified clinoptilolite-Ca zeolites were determined using inverse adsorption chromatography. Natural zeolites (CLINA) were treated with HCl at different concentrations, and the adsorption of N-2 and O-2 on these zeolites was studied using gas chromatography. The Langmuir and Henry equations were used to describe the experimental results of the adsorption. The results showed attractive selectivity of the zeolites for separating gases under dynamic conditions, and the structural modifications and characterization of the zeolites were also investigated.
Article
Materials Science, Multidisciplinary
K. B. Garcia-Lopez, R. Martinez-Martinez, A. N. Meza-Rocha, V. Vargas-Garcia, R. Lozada-Morales, R. Agustin-Serrano, E. Rubio-Rosas, G. Cedillo del Rosario, S. Carmona-Tellez
Summary: This work reports the synthesis and characterization of calcium tungstate-based micro-nanophosphors using the spray pyrolysis technique. CaWO4 and CaWO4:Eu(III) were found to have quasi-spherical shape according to Scanning Electron Microscopy measurements. The luminescent properties of CaWO4 are attributed to electron transition within unperturbed WO42- complexes, while CaWO4:Eu(III) displays luminescence due to radiative transitions within Eu(III) electronic energy states. The blended 3D resin with these phosphors exhibit blue luminescence and can be activated to produce red emission under different excitation wavelengths.
Article
Green & Sustainable Science & Technology
Raill Perez-Hernandez, Albina Gutierrez Martinez, Gilberto Mondragon Galicia, Maria E. Fernandez Garcia, Oscar Carrera Nunez, Miriam Vega Hernandez, Pavel Lopez, Claudia E. Gutierrez Wing
Summary: Ni/TiO2-Na nanotubes catalysts with different Ni contents were investigated for CO2 methanation. The characterization results showed that the 50Ni/TiO2-Na catalyst exhibited better CO2 conversion and high CH4 selectivity, while the 5Ni/TiO2-Na catalyst showed high CO selectivity and low CO2 methanation. The presence of Ni species in intimate contact with the support promoted the SMSI effect and influenced the strength of the catalyst basic sites.
Article
Polymer Science
Dulce J. Garcia-Garcia, G. F. Perez-Sanchez, H. Hernandez-Cocoletzi, M. G. Sanchez-Arzubide, M. L. Luna-Guevara, E. Rubio-Rosas, Rambabu Krishnamoorthy, C. Moran-Raya
Summary: A nanocoating based on chitosan and ZnO nanoparticles was developed for the preservation of strawberries, and its effectiveness was examined using various characterization methods. The coated strawberries maintained a fresh appearance during storage and showed reduced microbial growth.
Article
Engineering, Biomedical
L. S. Villasenor-Ceron, D. Mendoza-Anaya, S. Lopez-Ortiz, R. Rosales-Ibanez, J. J. Rodriguez-Martinez, M. I. Reyes-Valderrama, V. Rodriguez-Lugo
Summary: This study investigates the effect of Mn doping on the crystalline structure of hydroxyapatite (Hap) synthesized by the hydrothermal method. X-ray diffraction analysis reveals that the average size of crystallite decreases from 23.67 nm to 22.69 nm as the Mn concentration increases. Transmission electron microscopy shows two distributions of particle sizes in all samples. Fourier transform infrared analysis confirms the presence of characteristic absorption bands of PO4-3 and OH- groups in Hap. A substitution mechanism between Mn and Ca+2 ions of Hap is established. The cell viability test demonstrates that Hap with 1.5%wt Mn concentration exhibits non-cytotoxic behavior according to ISO 10993-5. Moreover, the materials exhibit good osteoinductive properties as shown by histology and immunofluorescence expression of osteogenic markers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
(2023)
