Study of the interaction between CO2 and complex metal hydrides

GRASSO, M. L.; J. A. PUSZKIEL; DORNHEIM, M.; C. PISTIDDA; L. FERNÁNDEZ ALBANESI; F. C. GENNARI

Sassari

Jornada; Sardinia-Chem 2019; 2019

University of Sassari

The continue increase of CO2 emissions from anthropogenic sources and their effects over the environment make it urgent to develop new technological options to reduce or mitigate CO2 emissions. One alternative is the capture, storage and conversion of CO2, which can be transformed in other valuable products such as methane, alcohols and plastics [1]. The methanation of CO2 was first reported by Sabatier et al. They showed that CO2 in the feed gas can be removed to produce methane and water during the ammonia synthesis. Also it is known that the reduction of CO2 to CH4 has important kinetic restrictions, and requires the use of a catalyst to achieve an acceptable rate and selectivity [2]. On this way, hydrogen storage alloys could be an attractive alternative to the classical catalysts for CO2 methanation and at the same time, provide enough hydrogen for the reaction [3,4].In this work, the potential of Mg2FeH6 and Mg2NiH4 complex hydrides for the conversion of CO2 was explored under static conditions. The obtained results show that magnesium based-metal hydride containing Fe and Ni catalyses the hydrogenation of CO2 with optimal experimental conditions at 400°C during 5 h and 10 h, respectively (see Fig.1). This study goes in depth in the use of Mg2FeH6 and Mg2NiH4 as hydrogen source and also the catalyst for the selective CO2 reduction to CH4 under mild conditions