Banca de DEFESA: ICARO VINICIUS SANTANA GOMES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ICARO VINICIUS SANTANA GOMES
DATA : 08/01/2020
HORA: 09:00
LOCAL: IQ UFBA
TÍTULO:

Study of nickel and lanthanum based catalysts with and without barium carbonate added applied in dry reforming of methane

PALAVRAS-CHAVES:

Dry reforming of methane. Nickel catalysts. Barium carbonate.

PÁGINAS: 105
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Físico Química Inorgânica
RESUMO:

Dry methane reforming (RSM) is a reaction whereby methane (CH4) and carbon dioxide (CO2) are converted into a 1: 1 mixture of hydrogen (H2) and carbon monoxide (CO). This mixture is known as synthesis gas and has many industrial applications. In addition, CH4 and CO2 are the two most important greenhouse gases (GHG) that can intensify global warming. Thus, RSM has been shown to be a promising pathway for the synthesis of H2 and CO, since besides generating synthesis gas of industrial interest, it can contribute to the decrease of two GHG concentrations in the atmosphere. However, the formation of carbon (coke) in the catalysts is one of the main stumbling blocks for RSM becoming industrially successful. In this work we investigated the effects of the addition of barium carbonate to lanthanum oxide (Ni / La2O3) supported nickel catalysts when applied in RSM. The catalyst precursors were prepared by the wet impregnation method, with and without addition of 5% BaCO3 by mass of the support. Then the two materials were calcined at two different temperatures (500 and 800 ° C), resulting in four different precursors. The precursors were characterized by thermogravimetric analysis (ATG), X-ray diffraction (XRD) and programmed hydrogen temperature reduction (TPR-H2). The catalysts were also characterized by XRD, after reduction and activation of the catalytic precursors. Scheduled temperature surface reaction (TPSR) analyzes and long-term catalytic tests (18 h at 700 ° C) were used to evaluate catalyst activity in RSM. TPSR profiles indicated that the four catalysts are active in RSM. Long-term catalytic tests showed that the catalyst containing 800 ° C calcined BaCO3 showed CH4 and CO2 conversions comparable to those without BaCO3 catalysts. In addition, through oxidation at the programmed oxygen temperature (TPO-O2) after catalytic tests, it was observed that the catalysts containing BaCO3 presented lower amount of carbon deposited. Based on this, it was concluded that the addition of BaCO3 to Ni / La2O3 catalysts can reduce coke deposition on the surface of these catalysts, making them more resistant to deactivation.

MEMBROS DA BANCA:
Presidente - 1100392 - SORAIA TEIXEIRA BRANDAO
Externo ao Programa - 2250011 - JAIME SOARES BOAVENTURA FILHO
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 - MARLUCE OLIVEIRA DA GUARDA SOUZA - UNEB