{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Medina OE"],"funding":["Agencia Nacional de Hidrocarburos - ANH"],"pagination":["E401"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC6474133"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["9(3)"],"pubmed_abstract":["The main objective of this work is the catalyst optimization of Fe₂O₃-, Co₃O₄-, NiO- and/or PdO- (transition element oxides-TEO) functionalized CeO₂ nanoparticles to maximize the conversion of asphaltenes under isothermal conditions at low temperatures (<250 °C) during steam injection processes. Adsorption isotherms and the subsequent steam decomposition process of asphaltenes for evaluating the catalysis were performed through batch adsorption experiments and thermogravimetric analyses coupled to Fourier-transform infrared spectroscopy (FTIR), respectively. The adsorption isotherms and the catalytic behavior were described by the solid-liquid equilibrium (SLE) model and isothermal model, respectively. Initially, three pairs of metal oxide combinations at a mass fraction of 1% of loading of CeNi1Pd1, CeCo1Pd1, and CeFe1Pd1 nanoparticles were evaluated based on the adsorption and catalytic activity, showing better results for the CeNi1Pd1 due to the Lewis acidity changes. Posteriorly, a simplex-centroid mixture design of experiments (SCMD) of three components was employed to optimize the metal oxides concentration (Ni and Pd) onto the CeO₂ surface by varying the oxides concentration for mass fractions from 0.0% to 2.0% to maximize the asphaltene conversion at low temperatures. Results showed that by incorporating mono-elemental and bi-elemental oxides onto CeO₂ nanoparticles, both adsorption and isothermal conversion of asphaltenes decrease in the order CeNi1Pd1 > CePd2 > CeNi0.66Pd0.66 > CeNi2 > CePd1 > CeNi1 > CeO₂. It is worth mentioning that bi-elemental nanoparticles reduced the gasification temperature of asphaltenes in a larger degree than mono-elemental nanoparticles at a fixed amount of adsorbed asphaltenes of 0.02 mg·m-2, confirming the synergistic effects between Pd and Fe, Co, and Ni. Further, optimized nanoparticles (CeNi0.89Pd1.1) have the best performance by obtaining 100% asphaltenes conversion in less than 90 min at 220 °C while reducing 80% the activation energy."],"journal":["Nanomaterials (Basel, Switzerland)"],"pubmed_title":["Optimization of the Load of Transition Metal Oxides (Fe₂O₃, Co₃O₄, NiO and/or PdO) onto CeO₂ Nanoparticles in Catalytic Steam Decomposition of n-C₇ Asphaltenes at Low Temperatures."],"pmcid":["PMC6474133"],"funding_grant_id":["272-2017"],"pubmed_authors":["Arias-Madrid D","Medina OE","Gallego J","Cortes FB","Franco CA"],"additional_accession":[]},"is_claimable":false,"name":"Optimization of the Load of Transition Metal Oxides (Fe₂O₃, Co₃O₄, NiO and/or PdO) onto CeO₂ Nanoparticles in Catalytic Steam Decomposition of n-C₇ Asphaltenes at Low Temperatures.","description":"The main objective of this work is the catalyst optimization of Fe₂O₃-, Co₃O₄-, NiO- and/or PdO- (transition element oxides-TEO) functionalized CeO₂ nanoparticles to maximize the conversion of asphaltenes under isothermal conditions at low temperatures (<250 °C) during steam injection processes. Adsorption isotherms and the subsequent steam decomposition process of asphaltenes for evaluating the catalysis were performed through batch adsorption experiments and thermogravimetric analyses coupled to Fourier-transform infrared spectroscopy (FTIR), respectively. The adsorption isotherms and the catalytic behavior were described by the solid-liquid equilibrium (SLE) model and isothermal model, respectively. Initially, three pairs of metal oxide combinations at a mass fraction of 1% of loading of CeNi1Pd1, CeCo1Pd1, and CeFe1Pd1 nanoparticles were evaluated based on the adsorption and catalytic activity, showing better results for the CeNi1Pd1 due to the Lewis acidity changes. Posteriorly, a simplex-centroid mixture design of experiments (SCMD) of three components was employed to optimize the metal oxides concentration (Ni and Pd) onto the CeO₂ surface by varying the oxides concentration for mass fractions from 0.0% to 2.0% to maximize the asphaltene conversion at low temperatures. Results showed that by incorporating mono-elemental and bi-elemental oxides onto CeO₂ nanoparticles, both adsorption and isothermal conversion of asphaltenes decrease in the order CeNi1Pd1 > CePd2 > CeNi0.66Pd0.66 > CeNi2 > CePd1 > CeNi1 > CeO₂. It is worth mentioning that bi-elemental nanoparticles reduced the gasification temperature of asphaltenes in a larger degree than mono-elemental nanoparticles at a fixed amount of adsorbed asphaltenes of 0.02 mg·m-2, confirming the synergistic effects between Pd and Fe, Co, and Ni. Further, optimized nanoparticles (CeNi0.89Pd1.1) have the best performance by obtaining 100% asphaltenes conversion in less than 90 min at 220 °C while reducing 80% the activation energy.","dates":{"release":"2019-01-01T00:00:00Z","publication":"2019 Mar","modification":"2024-12-03T15:32:22.537Z","creation":"2019-06-06T22:58:28Z"},"accession":"S-EPMC6474133","cross_references":{"pubmed":["30857326"],"doi":["10.3390/nano9030401"]}}