scholarly journals Thermal Decomposition of [AH][M(HCOO)3] Perovskite-Like Formates

Solids ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 165-176
Author(s):  
Lilián Claudia Gómez-Aguirre ◽  
Jorge Otero-Canabal ◽  
Manuel Sánchez-Andújar ◽  
María Antonia Señarís-Rodríguez ◽  
Socorro Castro-García ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Metal Oxide ◽  
Systematic Study ◽  
Metal Cation ◽  
Metal Ion ◽  
Reduction Potential ◽  
Inert Atmosphere ◽  
Evolved Gases ◽  
Final Residue

A systematic study of the thermal decomposition of hybrid perovskites of formula [AH][M(HCOO)3] under inert atmosphere was performed by means of thermogravimetry and simultaneous infrared spectroscopy of the evolved gases. The influence of: (i) the metal ion of the [M(HCOO)3]- framework and (ii) the guest [AH]+ cation, in the composition of the final residue was evaluated. In this work, it has been demonstrated that these materials can be used as precursors of metal or metal-oxide compounds—obtained free of carbon—, and that the composition of the final residue is determined by the standard reduction potential of the metal cation of the framework.

scholarly journals Metal ion influences distortion of the ligand in the structure of [M{2-MeO(O)CC6H4NHC(S)NP(S)(OiPr)2}2] (M = ZnII, CdII) complexes: a driving force for intermolecular aggregation

2015 ◽  
Vol 44 (31) ◽  
pp. 14101-14109 ◽  
Author(s):  
Damir A. Safin ◽  
Maria G. Babashkina ◽  
Michael Bolte ◽  
Mariusz P. Mitoraj ◽  
Axel Klein
Keyword(s):  
Crystal Structure ◽  
Metal Cation ◽  
Driving Force ◽  
Metal Ion ◽  
Supramolecular Aggregation

Reaction of the deprotonated 2-MeO(O)CC6H4NHC(S)NHP(S)(OiPr)2 (HL) with ZnII or CdII leads to [ZnL2] and [CdL2]. The nature of the metal cation (ZnIIvs. CdII) drives the supramolecular aggregation of molecules in the crystal structure.

Frontiers in the infrared spectroscopy of gas phase metal ion complexes

2005 ◽  
Vol 29 (12) ◽  
pp. 1495 ◽  
Author(s):  
Nicholas R. Walker ◽  
Richard S. Walters ◽  
Michael A. Duncan
Keyword(s):  
Infrared Spectroscopy ◽  
Gas Phase ◽  
Metal Ion ◽  
Metal Ion Complexes

The Decomposition of Perchloric Acid on Metal Oxide Catalysts

1971 ◽  
Vol 49 (17) ◽  
pp. 2827-2831 ◽  
Author(s):  
R. Gilbert ◽  
P. W. M. Jacobs
Keyword(s):  
Thermal Decomposition ◽  
Metal Oxide ◽  
Proton Transfer ◽  
Ammonium Perchlorate ◽  
Perchloric Acid ◽  
Catalyst Surface ◽  
Copper Chromite ◽  
Oxide Catalysts ◽  
The Other ◽  
Metal Oxide Catalysts

The thermal decomposition of perchloric acid has been investigated on five Harshaw catalysts: copper chromite, alumina, iron(III) oxide, copper(II) oxide, and manganese(IV) oxide (the last three being supported on alumina). Manganese(IV) oxide gave complex kinetics which were not fully analyzed but on the other four catalysts the reaction was.first order. Activation energies were: copper chromite, 54 kcal/mol; alumina, 28.8 kcal/mol; iron(III) oxide, 28.6 kcal/mol; copper(II) oxide, 39.0 kcal/mol. A mechanism is proposed for the decomposition which involves proton transfer to an accepter (typically an O2− ion) in the catalyst surface followed by decomposition of the ClO4− anion formed in this process. Some observations on the catalyzed thermal decomposition of ammonium perchlorate are presented.

scholarly journals Features of obtaining the catalyst for the synthesis of carbon nanotubes

2019 ◽  
Vol 81 (2) ◽  
pp. 261-267 ◽  
Author(s):  
E. A. Burakova ◽  
G. S. Besperstova ◽  
M. A. Neverova ◽  
A. G. Tkachev ◽  
N. V. Orlova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Decomposition ◽  
Metal Oxide ◽  
Specific Surface ◽  
Surface Area ◽  
Nanostructured Materials ◽  
Specific Surface Area ◽  
Oxide System ◽  
Decomposition Stage ◽  
Al2o3 Catalyst

In this paper, the features of obtaining a Co-Mo/Al2O3 catalyst to synthesize carbon nanotubes (CNTs) by thermal decomposition were studied. It was revealed that the duration of the pre-catalyst thermal decomposition stage in the process of developing a metal oxide system has a significant impact on its activity in the synthesis of carbon nanostructured materials by chemical vapor deposition (CVD). It was proved that an effective catalyst for CNTs synthesis can be obtained by through thermal decomposition of the pre – catalyst, without calcination of the metal oxide system. The use of the Co-Mo/Al2O3 catalyst, synthesized in such a way, in the CVD process makes it possible to reduce the cost of synthesized CNTs. Using scanning electron microscopy, it was shown that the size of the grains, and specific surface area of the formed Co-Mo/Al2O3 catalyst depend on the thermal treatment conditions of the pre-catalyst. Under the conditions for the implementation of the pre-catalyst thermal decomposition stage (temperature, volume, duration, etc.), it is possible to contro not only the characteristics of the resulting catalyst (specific surface area, efficiency), but also the characteristics of the CNTs (diameter, degree of defectiveness). In the course of experiments, the optimal modes of implementation of the method for obtaining the Co-Mo/Al2O3 catalyst allowed forming a system with a specific surface area of ~ 108 m2/g. The use of the resulting catalyst in the synthesis of nanostructured materials provides a high specific yield of multi-walled CNTs with a diameter of 8-20 nm and a degree of defectiveness of 0.97.

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