In:
New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 46, No. 8 ( 2022), p. 3707-3715
Abstract:
Reactions of carbon dioxide with lanthanide ethylenediaminetetraacetates M[Ln(EDTA)(H 2 O) 3 ]·5H 2 O (M = NH 4 , Na or K; Ln = La or Ce) result in the formation of highly water-soluble lanthanide carbonates with ethylenediaminetetraacetates (NH 4 ) 5 [La 3 (CO 3 )(EDTA) 3 (H 2 O) 3 ]·12H 2 O (1), Na 8 [Ln 2 (CO 3 ) 3 (EDTA) 2 ]·17.5H 2 O (Ln = La, 2; Ce, 3), and K 5 [Ln 3 (CO 3 )(EDTA) 3 (H 2 O) 3 ]·13.5H 2 O (Ln = La, 4; Ce, 5; H 4 EDTA = ethylenediaminetetraacetic acid) in dimethylformamide–water solution, which have been fully characterized. The main structures of these five complexes are all based on the [Ln(EDTA)] − unit, where carbonates participate due to coordination in μ 1 :η 2 (O,O) and μ 2 :η 2 (O,O′):η 2 (O,O′) fashion. The reactions of lanthanum ethylenediaminetetraacetate with CO 2 have been monitored via 13 C NMR measurements. Furthermore, the calcined products of 1 and 2 are used for the oxidative coupling reaction of methane (OCM). The results demonstrate the good catalytic performances of La 2 O 3 or La 2 O 2 CO 3 from 1 and a mixture of La 2 O 2 CO 3 and Na 2 CO 3 from 2. The coordination modes of the lanthanide carbonates in precursors 1 and 2 may provide a model for the interaction of lanthanide carbonates, which is useful for the OCM reaction.
Type of Medium:
Online Resource
ISSN:
1144-0546
,
1369-9261
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
1472933-7
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