Jump to main content
Jump to site search


Selective catalytic oxidation of ammonia over LaMAl11O19−δ (M = Fe, Cu, Co, and Mn) hexaaluminates catalysts at high temperatures in the Claus process

Author affiliations

Abstract

A method for the selective catalytic oxidation of ammonia at high temperature was innovatively proposed to substitute the traditional combustion method to remove the ammonia impurity in the Claus process. In the present work, transition metal (Fe, Cu Co, and Mn)-substituted La-hexaaluminate catalysts were synthesized and investigated for the selective catalytic oxidation of ammonia (NH3-SCO) at high temperature. It was observed that Cu-substituted catalysts could achieve the highest N2 yield at around 520 °C. It was confirmed that the conversion of NH3 was closely related to the reducibility of the prepared catalyst. In particular, it was observed that the molecular O2 could not be dissociatively adsorbed on the prepared catalyst surface. However, both lattice oxygen and gas-phase O2 could participate in NH3-SCO, with gas-phase O2 being the most favorable under the experimental conditions. It was evidenced that the NH3-SCO reaction over the prepared catalysts followed the i-SCR mechanism. Moreover, monodentate nitrates were the main reactive intermediates toward forming N2. Therefore, the development of high-temperature SCO technology and an efficient catalyst are beneficial for the sustainable development of the chemical industry.

Graphical abstract: Selective catalytic oxidation of ammonia over LaMAl11O19−δ (M = Fe, Cu, Co, and Mn) hexaaluminates catalysts at high temperatures in the Claus process

Back to tab navigation

Supplementary files

Article information


Submitted
12 Dec 2019
Accepted
15 Jan 2020
First published
15 Jan 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Selective catalytic oxidation of ammonia over LaMAl11O19−δ (M = Fe, Cu, Co, and Mn) hexaaluminates catalysts at high temperatures in the Claus process

G. Jiang, F. Zhang, Z. Wei, Z. Wang, Y. Sun, Y. Zhang, C. Lin, X. Zhang and Z. Hao, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02512J

Social activity

Search articles by author

Spotlight

Advertisements