Improved water dissociation and nitrous oxide decomposition by in situ oxygen removal in perovskite catalytic membrane reactor

authored by

Heqing Jiang, Haihui Wang, Fangyi Liang, Steffen Werth, Steffen Schirrmeister, Thomas Schiestel, Jürgen Caro

Abstract

The equilibrium controlled water dissociation and the kinetically controlled nitrous oxide (N₂O) decomposition were studied in the perovskite BaCo_xFe_yZr_1-x-yO_3-δ (BCFZ) oxygen-permeable membrane reactor. By increasing the temperature or pressure difference and by feeding reducing gases like methane or ethane to the permeate side to consume the permeated oxygen, hydrogen production rate or N₂O conversion could be enhanced. A hydrogen production rate of 3.1 cm³ min^-1 cm^-2 was obtained at 950 °C. When methane was used as the reducing gas on the shell side, the oxygen concentration on the N₂O side can be kept at a low level, thus avoiding the inhibition of the N₂O decomposition by adsorbed surface oxygen species. A complete decomposition of N₂O for gas streams containing 20 vol.% N₂O was achieved on the core side at 850 °C. Simultaneously, methane on the shell side was converted into synthesis gas with CO yield of above 80%. When feeding ethane to the shell side, the hydrogen from the thermal dehydrogenation of ethane can consume the permeated oxygen. At 850 °C, an ethane conversion of 85% and an ethylene selectivity of 86% were obtained.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry

External Organisation(s)

South China University of Technology
Thyssenkrupp AG
Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB)

Type

Article

Journal

Catalysis today

Volume

156

Pages

187-190

No. of pages

4

ISSN

0920-5861

Publication date

31.10.2010

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Catalysis, General Chemistry

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1016/j.cattod.2010.02.027 (Access: Closed)