Cobalt-lanthanum catalyst precursors for ammonia synthesis: determination of calcination temperature and storage conditions

Author:

Zybert Magdalena1,Tarka Aleksandra1,Mierzwa Bogusław2,Raróg-Pilecka Wioletta1

Affiliation:

1. Warsaw University of Technology , Faculty of Chemistry , Noakowskiego 3, 00-664 Warsaw , Poland

2. Institute of Physical Chemistry , Polish Academy of Sciences , Kasprzaka 44/52, 01-224 Warsaw , Poland

Abstract

Abstract A thermal decomposition of a cobalt-lanthanum catalyst precursor containing a mixture of cobalt and lanthanum compounds obtained by co-precipitation were studied using thermal analysis coupled with mass spectrometry (TG-MS). Studies revealed that the calcination in air at 500°C is sufficient to transform the obtained cobalt precipitate into Co3O4, but it leads to only partial decomposition of lanthanum precipitate. In order to obtain Co/La catalyst precursor containing La2O3 the calcination in air at the temperature about 800°C is required. However, it is unfavorable from the point of view of textural properties of the catalyst precursor. A strong effect of storage conditions on the phase composition of the studied cobalt-lanthanum catalyst precursor, caused by the formation of lanthanum hydroxide and lanthanum carbonates from La2O3 when contacting with air, was observed.

Publisher

Walter de Gruyter GmbH

Subject

General Chemical Engineering,General Chemistry,Biotechnology

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