Abstracts Book - IMRC 2018

• SC2-P002
HYDROXYLATION OF LITHIUM CUPRATE (Li2CuO2) FOR
HYDROGEN PRODUCTION BY WATER GAS SHIFT REACTION
Omar Hernandez Rivas 1,2 , Arturo Mendoza Nieto 1 , Heriberto Pfeiffer Perea 1
1 Instituto de Investigaciones en Materiales, Metallic and Ceramic Materials, Mexico.
2
Universidad Nacional Autónoma de México, Posgrado en Ciencias Químicas, Mexico.
The development of new and clean energies is very important, where hydrogen
production may become part of this solution. In general, Water Gas Shift
reaction has been used on different reforming or gasification processes, where
this reaction is used to decrease CO concentration in syngas (CO + H2),
increasing H2 concentration. It has been probed that lithium cuprate (Li2CuO2)
can work as bifunctional ceramic for CO2 capture with a previous and concurrent
catalytic process, such as CO oxidation and dry methane reforming process,
lithium cuprate has shown excellent CO2 capture and catalyst properties, where
copper provides catalytic activity. In the present work, Hydroxylated lithium
cuprate was analyzed as a possible multifunctional system on the modified
water gas shift reaction with carbon monoxide, where hydroxylated-Li2CuO2
functioned as catalyst, hydroxide source and CO2 captor. Initially, lithium
hydroxylation process was performed at different temperatures and relative
humidities, reaching good hydroxylation efficiencies (42.7-48.8 %).
Subsequently, these samples were tested determination a modified WGS
reaction to see the efficiency of H2 production, where the best temperature and
hydroxylation conditions were selected. Isothermal catalytic experiments
showed that the best hydrogen production was obtained between 200 and 250
°C. In these temperature range -OH anions desorbs Li2CuO2 and reacts with CO,
producing H2 and CO2. This reaction was finished as soon as all -OH anions were
totally desorbed. Moreover, two other processes were evidenced; i) part of the
CO2 produced was chemisorbed on Li2CuO2, producing Li2CO3 and CuO and ii)
once lithium cuprate was totally dehydroxylated, CO reacted with Li2CuO2,
reducing structural copper cations to Cu2O and even metallic copper. Finally,
different cyclic experiments were performed in order to find out the best
conditions for hydrogen production and lithium cuprate regeneration in
addition to dynamic tests with simultaneous flows of water vapor and carbon
monoxide based on previous experiments.
Acknowledgment: Omar Hernández-Rivas thanks to PNPC-CONACYT for
personal financial support. The present work was financially supported by