Banca de QUALIFICAÇÃO: RANDALL FERNANDO YEPEZ AYALA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RANDALL FERNANDO YEPEZ AYALA
DATE: 30/09/2021
TIME: 09:00
LOCAL: Google Meet
TITLE:

Hydrogen production from catalytic hydrolysis of sodium borohydride solution using Co-Ce/HDL as catalyst

KEY WORDS:

hydrogen, sodium borohydride, catalyst, lamellar double hydroxide, catalytic doping, energy

PAGES: 88
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

Currently, hydrogen (H2), works as an energy alternative due to its high energy power, being a gaseous substance, its
storage and transport becomes difficult. The solution to these disadvantages are complex metal hydrides, in this case
sodium borohydride (NaBH4), is one of the most studied and promising metal hydrides due to its high H2 storage capacity
(10.8% by weight), stability in alkaline solution at room temperature, and safety in operational uses that are safe for the
environment. Therefore, H2 can be generated through the catalyzed hydrolysis of NaBH4, which has non-contaminating
reaction products such as pure H2 and sodium metaborate (NaBO2). The most feasible catalyst for this dehydrogenation
process is lamellar double hydroxide (LDH) because it is highly stable in alkaline solutions, easy to produce and low
cost, moreover it functions as a catalytic support. Thus, to improve the catalytic activities and the efficiency of the
reaction, several metals are introduced during or after the synthesis of LDH, which have the function of dopants,
especially cobalt (Co) and cerium (Ce), for their good catalytic properties, generating a high flow of pure H2 by the
catalyzed reaction, and this flow serves to feed a fuel cell, especially the PEM fuel cell, because it requires less pure
H2 for its operation, generating low-power energy. In the present work the LDH was made by the co-precipitation method
and this will be the support for the resulting synthesis of the catalyst, adding the cations Co2+ and Ce4+, after the
formation of LDH, resulting in the final Co-Ce/LDH composite. The operating conditions of the reactor will be controlled
for the hydrolysis reaction of NaBH4 in basic medium and in presence of the Co-Ce/LDH composite. These will take
place at an operating time for a volume of pure H2 generated and this will be measured by means of the volume of
water displaced from an inverted measuring cylinder filled with water, therefore, a study of the characterizations of HDL
and the Co-Ce/HDL composite will be carried out, in addition to a complete kinetic study of the reaction. Thus, the work
consists of developing new catalysts to improve the performance of the catalyst and the catalysis of the reaction. This
with the purpose of obtaining a controlled flow of pure H2 as an energy alternative for the latest generation electronic
devices, because by producing the minimum amount of hydrogen it will provide enough energy for longer times of
operation, reducing environmental impacts, which shows the great innovative and technological potential of the present
study.

BANKING MEMBERS:
Presidente - 1314677 - CARMEM LUCIA DE PAIVA E SILVA ZANTA
Externo ao Programa - 013.808.764-43 - JOSÉ LEANDRO DA SILVA DUARTE - UFAL
Interno - 2343745 - JULIO COSME SANTOS DA SILVA
Externo ao Programa - 2278469 - LEONARDO MENDONCA TENORIO DE MAGALHAES OLIVEIRA
Interno - 1609640 - VINICIUS DEL COLLE