TY - JOUR

T1 - Experimental and modeling study of ammonia borane-based hydrogen storage systems

AU - Simagina, V. I.

AU - Vernikovskaya, N. V.

AU - Komova, O. V.

AU - Kayl, N. L.

AU - Netskina, O. V.

AU - Odegova, G. V.

N1 - Publisher Copyright: © 2017 Elsevier B.V.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Ammonia borane (NH3BH3, AB) is considered to be a promising hydrogen storage material owing to its very high content of hydrogen (19.6 wt%), high stability in air at ambient temperatures and the low temperature of the dehydrogenation process. In this work solid-state decomposition of NH3BH3 in contact with a series of solid materials has been investigated. It was shown that the reactivity of the studied AB-based hydrogen-generating systems was changing under the action of both the chemical nature and thermal conducting properties of the studied modifiers. It is important that, according to ATR-FTIR spectroscopy, the contact of AB with oxygen-containing supports (TiO2, γ-Al2O3, SiO2, MgO, HY zeolite) destabilizes the AB structure to evolve hydrogen already at 80 °C, independently of their chemical nature. On the other hand, it was shown that in a heat insulator reaction medium the temperature in the reaction zone increases leading to an increased yield of hydrogen. In addition to this, the reaction properties of AB have for the first time been studied depending on the radius of the tubular reactor during the low-temperature dehydrogenation (90 °C) under conditions preventing appearance of local thermal spikes. A mathematical model has been developed which describes the obtained experimental results taking into account the propagation of the reagent-product interface from the heated reactor wall towards its axis.

AB - Ammonia borane (NH3BH3, AB) is considered to be a promising hydrogen storage material owing to its very high content of hydrogen (19.6 wt%), high stability in air at ambient temperatures and the low temperature of the dehydrogenation process. In this work solid-state decomposition of NH3BH3 in contact with a series of solid materials has been investigated. It was shown that the reactivity of the studied AB-based hydrogen-generating systems was changing under the action of both the chemical nature and thermal conducting properties of the studied modifiers. It is important that, according to ATR-FTIR spectroscopy, the contact of AB with oxygen-containing supports (TiO2, γ-Al2O3, SiO2, MgO, HY zeolite) destabilizes the AB structure to evolve hydrogen already at 80 °C, independently of their chemical nature. On the other hand, it was shown that in a heat insulator reaction medium the temperature in the reaction zone increases leading to an increased yield of hydrogen. In addition to this, the reaction properties of AB have for the first time been studied depending on the radius of the tubular reactor during the low-temperature dehydrogenation (90 °C) under conditions preventing appearance of local thermal spikes. A mathematical model has been developed which describes the obtained experimental results taking into account the propagation of the reagent-product interface from the heated reactor wall towards its axis.

KW - Ammonia borane

KW - Hydrogen storage

KW - Mass and heat transfer

KW - Mathematical model

KW - Modifiers

KW - Radius of tubular reactor

KW - N-H COMPOUNDS

KW - ACID

KW - COMPOSITES

KW - RELEASE

KW - THERMAL-DECOMPOSITION

KW - HYDRIDE

KW - DEHYDROGENATION

KW - CONDUCTIVITY

KW - KINETICS

KW - NH3BH3

UR - http://www.scopus.com/inward/record.url?scp=85019024907&partnerID=8YFLogxK

U2 - 10.1016/j.cej.2017.05.005

DO - 10.1016/j.cej.2017.05.005

M3 - Article

AN - SCOPUS:85019024907

VL - 329

SP - 156

EP - 164

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -