Banca de DEFESA: RAICK SUEL PINHEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAICK SUEL PINHEIRO
DATE: 29/11/2021
TIME: 14:00
LOCAL: https://meet.google.com/eju-kzew-pmu
TITLE:

SELECTIVE CATALYTIC COMBUSTION OF ACRYLONITRILE ON CATALYSTS (Co, Cu and Fe)-ZSM-5 and (Co, Cu and Fe)-BETA

KEY WORDS:

combustion; acrylonitrile; catalyst; ZSM-5 zeolite; Beta zeolite

PAGES: 72
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Operações Industriais e Equipamentos para Engenharia Química
SPECIALTY: Reatores Químicos
SUMMARY:

A wide range of substances is considered toxic, harm the environment and are harmful to human health. Among these substances, Acrylonitrile has these characteristics that makes it a very dangerous pollutant, so the removal of this organic compound is necessary. Two methods are commonly applied for treatment, and among them, Selective Catalytic Combustion appears as a promising technique because it is possible to be operationalized at reduced temperatures in relation to the conventional method, and generates harmless products such as N2 and CO2. For this, a series of zeolytic catalysts (Co, Cu and Fe)-ZSM-5 and (Co, Cu and Fe)-Beta were prepared by the ion exchange method and evaluated in selective catalytic combustion of acrylonitrile (SCC-AN). Physical and chemical properties of these materials were characterized by XRD, TPR-H2 and UV-Vis spectroscopy. XRD analyses showed that the morphology of Beta and ZSM-5 zeolites were preserved. It was also possible to identify the presence of CuO in Cu-Beta and cu-ZSM-5 and Fe2O3 catalysts in Fe-Beta and Fe-ZSM-5 catalysts. For Co-Beta and Co-ZSM-5 it was not possible to identify cobalt oxide species, possibly they are interchanged and offsetting load in zeolites. Regarding the analysis of TPR-H2 it was possible to identify two or more reduction steps for the catalysts of (Cu and Fe)-Beta and (Cu and Fe)-ZSM-5. Uv-Vis showed bands related to Cu2+, CuO and [Cu-O-Cu]2+ for Cu-Beta and Cu-ZSM-5, while for Fe-Beta and Fe-ZSM-5 isolated ions of Fe3+, and Co-Beta and Co-ZSM-5 presented bands related to Co2+. It was observed in the catalytic tests that the catalysts modified with Fe were the most active, where Fe3+ species were the main active sites of SCC-AN. Regarding selectivity at N2 and CO2, (Fe and Co)-ZSM-5 showed better results, however, this presented traces of NO and N2O. Therefore, it is possible to infer that Fe-ZSM-5 presented the best results for SSC-AN because it could combine good conversion, reduced temperature, high selectivity to N2 and CO2 and low formation of undesirable by-products. The other catalysts were somehow less selective to N2 and CO2, or generated some kind of secondary pollution.

BANKING MEMBERS:
Presidente - 1435340 - MARCELO DA SILVA BATISTA
Interno - 1759475 - JORGE DAVID ALGUIAR BELLIDO
Externo à Instituição - WAGNER LUIS DA SILVA FARIA - UFV