Banca de DEFESA: AKÁCIA VICTÓRIA SILVA DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : AKÁCIA VICTÓRIA SILVA DOS SANTOS
DATA : 08/01/2020
HORA: 14:00
LOCAL: IQ UFBA
TÍTULO:

STUDY OF CATALYSTS OBTAINED FROM PEROVSKITA TYPE OXIDES OF Ni, Nb AND LA APPLIED IN THE METHANE REFORMING WITH CO2 IN THE PRESENCE OF O2

PALAVRAS-CHAVES:

natural gas, methane reforming, RMCO, perovskite, niobium.

PÁGINAS: 100
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Físico Química Inorgânica
RESUMO:

Synthesis gas, a mixture of H2 and CO gases, is widely used as a reagent in different processes. This mixture can be obtained by different reactions, such as methane vapor reforming (RVM), dry methane reforming (RSM) and partial methane oxidation (OPM). In addition to the three main reactions cited, there are other means for the formation of synthesis gas from methane, such as methane reforming with CO2 in the presence of O2 (RMCO), considered as resulting from the union of RSM and OPM. In RMCO the two main greenhouse gases (CH4 and CO2) are used as reagents. In addition, RMCO is more thermodynamically favorable than RSM because, since partial methane oxidation (OPM) is an exothermic reaction, the addition of oxygen provides energy and thermodynamically facilitates the process. In this work, the study of catalysts obtained from nickel, niobium and lanthanum perovskite precursors applied in RMCO was carried out. The perovskites of the formula LaNiO3 and LaNi0.5Nb0.5O3 were synthesized by the citrate method and characterized by X-ray Diffraction (XRD) and H2 Temperature Programmed Temperature Reduction (TPR-H2). The catalysts obtained after reduction of the synthesized precursors were tested in RMCO, by Programmed Surface Temperature Reaction (TPSR) and Long Term Catalytic Tests. The tests were performed at 700 ° C, with two different proportions of O2 and lasted 18h. By XRD and TPR-H2 analyzes, it was possible to conclude that, after precursor reduction, Ni / La2O3 and Ni / La2O3-LaNbO4 systems were obtained. TPSR profiles indicated that the catalysts studied are active in RMCO. Based on long-term test data, it was possible to conclude that the niobium-containing catalyst has higher activity and that, for a same system, the use of a higher proportion of O2 provides higher values of catalytic activity.

MEMBROS DA BANCA:
Presidente - 1100392 - SORAIA TEIXEIRA BRANDAO
Externo ao Programa - 2724542 - ISABEL CRISTINA RIGOLI
Externo ao Programa - 1103214 - DENILSON SANTOS COSTA
Externo ao Programa - 1322475 - CAIO LUIS SANTOS SILVA
Externo à Instituição - ROBERT NEWTON DA SILVA HENRIQUES MAGALHÃES - IFBA
Externo à Instituição - MARLUCE OLIVEIRA DA GUARDA SOUZA - UNEB