Banca de DEFESA: ROMERO TORRES BUENO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ROMERO TORRES BUENO
DATE: 20/12/2023
TIME: 14:00
LOCAL: Videoconferência pelo link: https://meet.google.com/eju-kzew-pmu
TITLE:

CATALYTIC COMBUSTION OF ACRYLONITRILE OVER CuCeOx-HBETA CATALYSTS

KEY WORDS:

Acrylonitrile; Catalytic combustion; Catalyst; Copper; Cerium

PAGES: 53
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Acrylonitrile (ACN) is one of the most used monomers in the chemical industry, being used
in the synthesis of plastics, rubbers and acrylic fibers, for example. However, it is also a
volatile organic compound (VOC) of high toxicity, which is present in industrial exhaust
gases. These gases, therefore, require appropriate treatment. In this context, selective catalytic
combustion (CCS) stands out as a highly promising technology for removing ACN in
industrial gas effluents. This method consists of using catalysts to reduce the temperatures
required for combustion and control the formation of unwanted by-products, such as nitrogen
oxides (NOx). Thus, this study aimed to study catalysts based on BETA zeolite, modified
with copper and cerium (CuCeOx-HBETA), in the ACN CCS reaction. These materials were
prepared by wet impregnation and characterized by the techniques of X-ray diffraction
(XRD), Fourier transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy in
the visible ultraviolet region (DRS UV-Vis) and reduction with hydrogen at the programmed
temperature (RTP-H2). The performance of these catalysts in ACN CCS was evaluated using
catalytic tests. XRD results showed that copper and/or cerium oxides are present in the
catalysts as nanoparticles. CeO2 presented nanocrystal sizes (5.7-8.0 nm) smaller than CuO
nanocrystals (~20 nm). Through FTIR analyses, a great similarity was noted between the
spectra of the CuCeOx-HBETA catalysts and that of HBETA, indicating that their structure
was preserved after the wet impregnation and heat treatment process. By UV-Vis DRS, bands
related to Cu2+, [Cu-O-Cu]2+, CuO, Ce3+ and Ce4+ species were observed in the spectra of
CuCeOx-HBETA catalysts. RTP-H2 results revealed that the dispersion and reducibility of
CuO were improved due to the presence of CeO2. Finally, catalytic tests showed that
CuCeOx-HBETA catalysts achieved high conversions between 300-350°C. The greater
activity of the catalysts was attributed to the presence of highly dispersed CuO species and
isolated Cu2+ ions. The 10Cu10Ce-HBETA catalyst, with a copper/cerium ratio equal to 1,
was the most active due to the best synergy between copper and cerium species. Furthermore,
the catalysts showed good selectivity in relation to the formation of N2, since the formation of
NOx was insignificant.

BANKING MEMBERS:
Externo à Instituição - ANDRÉ GUSTAVO SATO - UFV
Interno - 1810291 - DEMIAN PATRICK FABIANO
Presidente - 1435340 - MARCELO DA SILVA BATISTA