Banca de DEFESA: CAROLINA DA SILVA COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CAROLINA DA SILVA COSTA
DATE: 20/02/2020
TIME: 09:00
LOCAL: Auditório do CTEC
TITLE:

Development of a pressurized catalytic system for converting γ-butyrolactone into high added value products.

KEY WORDS:

Catalytic hydrogenation, γ-butyrolactone, 1,4-butanediol, tetrahydrofuran

PAGES: 77
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SUMMARY:

The unsustainability of the use of fossil materials generates the search for alternative components capable of producing chemical products and energy from clean, renewable and economically viable processes. In the context of chemical product production, biomass is considered a source of platform molecules capable of synthesizing high value-added chemicals. γ-Butyrolactone (GBL), for example, is an important platform molecule for the production of 1,4-butanediol (BDO) and tetrahydrofuran (THF), these substances having several industrial applications. Thus, the present work aimed to study the processes of catalytic hydrogenation of γ-butyrolactone, employing bimetallic nanostructured catalysts based on palladium and rhenium and supported on silica (PdRe/SiO₂). The PdRe/SiO₂ catalysts were synthesized by the successive impregnation method and characterized in terms of their surface and pore volume, quantity of metals, reduction temperature, crystalline structure and morphology. The reactions were evaluated for the effect of temperature and pressure, from a central rotational composite design, water effect (solvent) and supercritical CO₂ (reaction medium). The catalysts were characterized as mesoporous materials with narrow and uniform pores. From the XRD of the catalyst, the Pd peaks were identified in different planes, only a peak of Re and a characteristic peak of amorphous materials referring to silica. TEM images showed agglomerated metal structures, but well distributed on the support. For the reactions, only the linear temperature effect was significant for the GBL conversion, while for the BDO selectivity, the quadratic effects of temperature and pressure were statistically significant. Dimers of BDO and GBL were identified as products of the reactions and water had a great influence on their formations. The effects of CO₂-SC were more expressive in increasing the selectivity of THF.

BANKING MEMBERS:
Interna - 1543286 - CAMILA GAMBINI PEREIRA
Externo à Instituição - FRANCISCO WENDELL BEZERRA LOPES - UnP
Externa à Instituição - MARIA CARLENISE PAIVA DE ALENCAR MOURA - UFRN
Externo à Instituição - PEDRO MIGUEL VIDINHA GOMES - USP
Externo ao Programa - 2087667 - TIAGO PINHEIRO BRAGA