Article
Chemistry, Applied
Shamil O. Omarov, Kirill D. Martinson, Anna N. Matveyeva, Maria Chebanenko, Vladimir N. Nevedomskiy, Vadim Popkov
Summary: Nanocrystalline Ni/CeO2 catalysts prepared by urea-nitrate combustion synthesis showed good catalytic performance in glycerol steam reforming. Characterization of the catalysts revealed that NiO mainly existed in the X-ray amorphous state and remained in the Ni-0 particles after reduction. Increasing the Ni content inhibited the agglomeration of CeO2 crystallites and increased the defectiveness of CeO2. The sample with 6.8 wt% Ni exhibited the best catalytic performance.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hao Zhang, Xiaohui Gao, Binwei Gong, Shijie Shao, Chensheng Tu, Jun Pan, Yangyang Wang, Qiguang Dai, Yanglong Guo, Xingyi Wang
Summary: MoOx/CeO2 catalysts with different forms of MoOx on CeO2 were prepared for the catalytic oxidation of 1,2-dichloroethane. The acidity and surface oxygen from CeO2 domain play important roles in the activity of the catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Nanoscience & Nanotechnology
Andrea Mussio, Maila Danielis, Nuria J. Divins, Jordi Llorca, Sara Colussi, Alessandro Trovarelli
Summary: Bimetallic Pt-Pd catalysts supported on ceria show improved performance in wet conditions, possibly due to the formation of unique mushroom-like structures resulting from the alloying of Pt and Pd. Catalyst prepared by milling Pd metal and ceria first, followed by the addition of Pt, exhibits better performance compared to conventional impregnated samples.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Jishuang He, Peng Yao, Jing Qiu, Hailong Zhang, Yi Jiao, Jianli Wang, Yaoqiang Chen
Summary: Ce0.5Zr0.5O2 catalysts promoted by multivalent transition metal (Mn, Fe, Co) oxides were prepared to accelerate soot combustion. It was found that Mn and Co-doped catalysts significantly improved catalytic activity, while Fe-doped catalyst had a minor effect. Further characterization revealed that active oxygen species and oxygen vacancies played significant roles in enhancing soot combustion, especially for Mn and Co. Co-doped catalyst also exhibited excellent NO-NO2 conversion capacity, leading to reduced soot ignition temperature, whereas Fe-doped catalyst showed weaker NO oxidation performance due to abundant adsorbed carbonates.
Article
Chemistry, Multidisciplinary
Yali Du, Dong Lu, Jiangning Liu, Xiaodong Li, Chaohui Wu, Xu Wu, Xia An
Summary: A series of copper oxide catalysts supported on cerium oxide particles with different morphologies were fabricated and their catalytic performance in the NO + CO reaction was evaluated. The results show that the morphology and crystal-plane of CeO2 significantly affect the catalytic performance. CuOx/CeO2-H catalyst exhibits excellent NO conversion, N-2 selectivity, and O-2/H2O/SO2 resistance due to the presence of (100) and (111) planes, which provide an optimal coordination environment for Cu2+ ions and enrich active sites.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Applied
Wei Wang, Yajie Liu, Li Wang, Wangcheng Zhan, Yanglong Guo, Yun Guo
Summary: CeO2 nano-cubes as the support of Ag/CeO2 exhibit higher activity in soot combustion, attributed to the presence of metallic state Ag and high concentration of oxygen vacancies. CeO2-R and CeO2-O show improvement as well, but still have limitations in oxygen activation and reaction pathway compared to CeO2-C.
Article
Environmental Sciences
Jishuang He, Hailong Zhang, Wei Wang, Peng Yao, Yi Jiao, Jianli Wang, Yaoqiang Chen
Summary: This study found that Na- and K-doped catalysts have a promoting effect on soot combustion, while Ca- and P-doped catalysts have a negative impact. Doping biodiesel impurities led to a smaller surface area by blocking small pores. Surface chemical properties, including NO oxidation/storage capacity, play a significant role in promoting soot combustion.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Chemical
Siyu Gao, Di Yu, Shengran Zhou, Chunlei Zhang, Lanyi Wang, Xiaoqiang Fan, Xuehua Yu, Zhen Zhao
Summary: With the increasing strictness of environmental protection regulations, reducing pollution from diesel vehicle exhaust has become a widespread concern. This study synthesizes MnOx/CeO2 nanosphere catalysts with high reactive oxygen species using a two-step hydrothermal method, which show good catalytic activity and prospects for practical applications.
Article
Engineering, Multidisciplinary
Xinyu Cao, Tiancheng Pu, Bar Mosevitzky Lis, Israel E. Wachs, Chong Peng, Minghui Zhu, Yongkang Hu
Summary: The reconstruction of supported nickel catalyst was found to be sensitive to pretreatment conditions. Activating the catalyst in syngas instead of hydrogen resulted in supported Ni nanoparticles with a polycrystalline structure and abundant grain boundaries. This unique catalyst structure enhanced CO adsorption and improved CO methanation rate, and can potentially guide the rational design of other supported metal catalysts.
Article
Chemistry, Applied
S. P. Ratnayake, M. M. M. G. P. G. Mantilaka, C. Sandaruwan, D. Dahanayake, Y. Pivini Gunasekara, S. Jeyasakthy, N. M. Gurusinghe, U. K. Wanninayake, K. M. Nalin de Silva
Summary: A facile urea solution combustion method was used for synthesizing highly catalytic CeO2 nanostructures with varying properties under different thermal conditions. CeO2 synthesized at 800 degrees C exhibited superior catalytic performance compared to others, attributed to its unique nanomorphology. The synthesis of these CeO2 nanostructures represents a cost-effective and convenient abatement technique for carbon particulates in atmospheric pollution mitigation.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Physical
Tiancheng Pu, Jiacheng Chen, Weifeng Tu, Jing Xu, Yi-Fan Han, Israel E. Wachs, Minghui Zhu
Summary: In this study, the strong metal-support interaction (SMSI) phenomenon for supported Ni/CeO2 catalysts with different CeO2 nanomorphologies was systematically explored. The degree of encapsulation of Ni particles originating from the SMSI effect was found to be positively correlated with the CO2 hydrogenation activity. Quasi in situ XPS and in situ DRIFTS techniques were used to reveal the relevant species and reaction pathways. These findings provide a fundamental strategy for tailoring catalytic performance by adjusting the support surface structure.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Hanan A. Ahmed, Ahmed E. Awadallah, Ateyya A. Aboul-Enein, Sanaa M. Solyman, Noha A. K. Aboul-Gheit
Summary: The study developed and examined bimetallic Ni-Mo catalysts supported on CeO2 and CeO2-SiO2 for CH4 decomposition, revealing the influence of SiO2 on catalytic efficiency. Ni-Mo/CeO2 catalyst demonstrated exceptional decomposition behavior and durability, with high hydrogen yield.
Article
Chemistry, Physical
Pablo G. Lustemberg, Zhongtian Mao, Agustin Salcedo, Beatriz Irigoyen, M. Veronica Ganduglia-Pirovano, Charles T. Campbell
Summary: Research has shown that cationic Ni atoms in clusters at step edges on the CeO2(111) surface are the most active sites for methane conversion reactions, with their small size and high Ni chemical potential contributing to their activity. Density functional theory calculations have clarified the reasons behind this observation, highlighting the importance of the size and morphology of supported Ni nanoparticles, strong Ni-support bonding, and charge transfer at step edges for high catalytic activity, particularly in the activation barrier for C-H bond cleavage during CH4 dissociative adsorption. This knowledge is expected to inspire the development of more efficient catalysts for these reactions.
Article
Chemistry, Physical
Shiva Fazlikeshteli, Xavier Vendrell, Jordi Llorca
Summary: Monometallic Pd and Ni and bimetallic Pd-Ni catalysts supported on CeO2 were prepared and tested for syngas production by the partial oxidation of methane. Bimetallic Pd-Ni/CeO2 catalysts exhibited higher methane conversion and syngas yield compared to monometallic Ni/CeO2 and Pd/CeO2. The bimetallic catalysts prepared by ball milling showed syngas production at lower temperatures. Various preparation parameters were examined, and the best performance was achieved with a bimetallic catalyst prepared at 50 Hz for 20 min, containing only 0.12 wt% Pd and 1.38 wt% Ni. Stability tests demonstrated superior stability for mechanochemically prepared bimetallic Pd-Ni/CeO2 catalysts. The results suggest that the impressive dispersion of metal species and strong interaction with the CeO2 surface contribute to the improved performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Binghu Zhang, Jianfu Chen, Guisheng Wu, Yun Guo, Haifeng Wang
Summary: The co-feeding of NO can enhance soot combustion activity on CeO2(111) by two orders of magnitude, mainly due to the in-situ generation of O vacancies from NO oxidation which indirectly enhance the adsorption of more reactive peroxide species. The study provides insights on the catalytic mechanism of NO in boosting soot combustion and suggests the optimization of after-treat systems in diesel exhaust emissions.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
J. Castelo-Quiben, E. Bailon-Garcia, A. Moral-Rodriguez, F. Carrasco-Marin, A. F. Perez-Cadenas
Summary: The development of advanced catalysts for energy applications is necessary due to energy demand and environmental concerns. By transforming organic polymers into advanced carbon functional materials, plastic waste can be converted into catalysts for fuel cells. The addition of transition metals can improve electrochemical parameters and achieve the desired 4-electron pathway, with the key factors for ORR performance including graphitization degree, metal dispersion, and presence of carbon nanofibers.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Teresa Briz-Amate, Jesica Castelo-Quiben, Esther Bailon-Garcia, Abdalla Abdelwahab, Francisco Carrasco-Marin, Agustin F. Perez-Cadenas
Summary: This work demonstrates the preparation of carbon nanospheres with a high nitrogen content using a simple hydrothermal method. The presence of tungsten nanophases significantly improves the electro-catalytic behavior in the ORR. The synergy between tungsten carbide and other electro-catalytic metals in this reaction requires further evaluation.
Article
Chemistry, Physical
Begona Sellers-Anton, Esther Bailon-Garcia, Arantxa Davo-Quinonero, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: A Ce(0.5)Pr(0.5)Ox soot combustion catalyst with both high activity and thermal stability has been developed by combining Ce(0.5)Pr(0.5)Ox nanoparticles and MS-macroporous structures. The hybrid catalyst showed a significant decrease in soot combustion temperature compared to the uncatalyzed reaction, and the thermal aging only slightly affected its performance. The Ce(0.5)Pr(0.5)Ox nanoparticles provided high activity, while the MS structure improved the contact between the catalyst and soot particles.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Cristian Yesid Chaparro-Garnica, Esther Bailon-Garcia, Arantxa Davo-Quinonero, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: Sponge-like carbon monoliths with tailored channel architecture and porosity were prepared using sol-gel polymerization and 3D printing technology. The size and interconnection degree of primary particles, pore width, and macropores volume can be controlled by varying the water concentration used in the synthesis. Higher water concentration enhances the dispersion and distribution of CuO/CeO2 on the carbon network, increasing catalytic activity. However, a more heterogeneous pore size distribution at high water concentration leads to preferential flow pathways and hinders the improvement in catalytic performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
L. P. Maiorano, C. Y. Chaparro-Garnica, E. Bailon Garcia, D. Lozano-Castello, A. Bueno-Lopez, J. M. Molina-Jorda
Summary: The preparation and use of Guefoams as heterogeneous catalyst is reported. The Guefoam catalyst, consisting of an open-pore Al-Si foam and a freely mobile guest phase, shows similar activity and selectivity to a packed bed of the same active phase particles, but with the advantages of a structured reactor. The Guefoam catalyst also exhibits improved thermal conductivity and permeability compared to the packed bed.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Sergio Lopez-Rodriguez, Arantxa Davo-Quinonero, Esther Bailon-Garcia, Dolores Lozano-Castello, Ignacio J. Villar-Garcia, Virginia Perez Dieste, Jon Ander Onrubia Calvo, Juan Ramon Gonzalez Velasco, Agustin Bueno-Lopez
Summary: The active sites of Ni/CeO2 catalysts for CO2 methanation are identified as Ni2+-CeO2 and Ni-0. The H-2 reduction rate of Ni2+-CeO2/Ni-0 and Ce4+/Ce3+ couples is much faster than their CO2 reoxidation rate, indicating the high activity of the catalyst. The presence of oxidized nickel under reaction conditions also suggests the simultaneous presence of Ni2+-CeO2 and Ni-0 active sites.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Chemistry, Multidisciplinary
Adrian Quindimil, Jon A. Onrubia-Calvo, Arantxa Davo-Quinonero, Alejandro Bermejo-Lopez, Esther Bailon-Garcia, Benat Pereda-Ayo, Dolores Lozano-Castello, Jose A. Gonzalez-Marcos, Agustin Bueno-Lopez, Juan R. Gonzalez-Velasco
Summary: The mechanism and kinetic of CO2 methanation reaction of 9.5% Ni/Al2O3 catalyst is analyzed, and a kinetic model capable to accurately predict the reaction rate is developed. The proposed H-assisted CO formation route improves the accuracy of the model.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Engineering, Chemical
Elias Garcia-Hernandez, Carlos Gilberto Aguilar-Madera, Erik Cesar Herrera-Hernandez, Jose Valente Flores-Cano, Esther Bailon-Garcia, Ana Teresa Finol Gonzalez, Angelica Aguilar-Aguilar, Raul Ocampo-Perez
Summary: This work presents the experimental and numerical analysis of pyridine adsorption onto activated carbon cloth in a stirred batch adsorber under transition and turbulent regime. By implementing three-dimensional numerical modeling, local velocity, local concentration, and concentration gradients inside the adsorber were identified. It was found that varying the agitation rate and pyridine initial concentration can impact the kinetic and transport parameters of the adsorption process, and the formation of hydrodynamic and mass boundary layers around the adsorbent.
Article
Engineering, Environmental
Alberto Sanchez-Diaz, Ana I. Zarate-Guzman, Esther Bailon-Garcia, Nahum Medellin-Castillo, Erika Padilla-Ortega, Angelica Aguilar-Aguilar, Rogelio Flores-Ramirez, Radl Ocampo-Perez
Summary: This study compared the adsorption performance of activated carbon pellets (ACP) for phenol under conventional agitation and low-frequency ultrasound. The effects of modifying the ACP with a physical reactivation process and the chemical and textural properties on the adsorption rate were evaluated. The results showed that the reactivation process improved the adsorption capacity, and ultrasound enhanced the adsorption rate.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Chemical
Jon A. Onrubia-Calvo, Adrian Quindimil, Arantxa Davo-Quinonero, Alejandro Bermejo-Lopez, Esther Bailon-Garcia, Benat Pereda-Ayo, Dolores Lozano-Castello, Jose A. Gonzalez-Marcos, Agustin Bueno-Lopez, Juan R. Gonzalez-Velasco
Summary: The reaction kinetics of CO2 methanation over a highly active 8.5% Ni/CeO2 catalyst was studied, and the formate route was found to accurately predict the experimental data.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Environmental
Helena Garcia-Rosero, Luis A. Romero-Cano, Angelica Aguilar-Aguilar, Esther Bailon-Garcia, Ana P. Carvalho, Agustin F. Perez-Cadenas, Francisco Carrasco-Marin
Summary: A biocarbon material was designed from Melia Azedarach stones to remove pharmaceutical pollutants present in water through adsorption/degradation processes. The material showed high surface area and mainly oxygenated groups, making it effective in removing Atenolol. The material proved to be versatile and capable of adsorbing Atenolol in different water matrices, with a pseudo-second-order adsorption kinetics and Langmuir adsorption isotherms.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
A. Parra-Marfil, M. Lopez-Ramon, A. Aguilar-Aguilar, I. A. Garcia-Silva, S. Rosales-Mendoza, L. A. Romero-Cano, E. Bailon-Garcia, R. Ocampo-Perez
Summary: This study aims to analyze the performance of advanced oxidation processes using sulfate radicals in the degradation of metformin from water. The degradation percentages ranged from 26.1% to 87.3%, while the mineralization percentages varied between 15.1% and 64%. The input variables of initial metformin concentration, oxidant concentration, and temperature had significant effects on the degradation process. Three degradation pathways were proposed based on the analysis of the detected byproducts, and it was found that the toxicity of the degradation byproducts was generally lower than that of metformin.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Damarys H. Carrales-Alvarado, Roberto Leyva-Ramos, Esther Bailon-Garcia, Francisco Carrasco-Marin, Diana E. Villela-Martinez
Summary: Organic xerogel microspheres (SX) were synthesized and carbonized to obtain carbon xerogel spheres (SXCs). The addition of clay sodium sepiolite (SNa) or exfoliated vermiculite (V(ex)f) enhanced the adsorption capacity towards Cd(II). The synergistic effect revealed that Cd2+ was adsorbed on the SX-K acidic sites and by cation exchange on the SNa.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Proceedings Paper
Materials Science, Multidisciplinary
Daouda Kouotou, El Khadir Gharibi, Esther Bailon-Garcia, Mohammed Ghalit
Summary: This study focuses on the removal of Cd (II) ions from aqueous solutions using modified activated carbon derived from palm kernel shells. The results showed that the removal percentage of Cd (II) ions increased with the contact time and reached equilibrium after 150 minutes, with a removal percentage of 51.24%. The optimal pH range for adsorption was found to be between 5 and 7, with an optimal adsorbent dose of 0.03 g. The Freundlich and Hasley isotherm models provided the best fit to the experimental data, indicating the heterogeneity of the Ce-doped activated carbon surface. Scanning electron microscopy confirmed the surface heterogeneity and material porosity. Kinetics studies revealed that both chemisorption and physisorption mechanisms were involved in the removal of Cd (II) ions, with hydrated radius and diffusion process playing a crucial role in controlling the adsorption process. Overall, the Ce-doped activated carbon derived from palm kernel shells is a cost-effective alternative adsorbent for the remediation of heavy metal contamination in water resources.
MATERIALS TODAY-PROCEEDINGS
(2022)