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  Thermokinetic investigation of binary Cu/Zn hydroxycarbonates as precursors for Cu/ZnO catalysts

Tarasov, A., Schumann, J., Girgsdies, F., Thomas, N., & Behrens, M. (2014). Thermokinetic investigation of binary Cu/Zn hydroxycarbonates as precursors for Cu/ZnO catalysts. Thermochimica Acta, 591, 1-9. doi:10.1016/j.tca.2014.04.025.

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 Creators:
Tarasov, Andrey1, Author              
Schumann, Julia1, Author              
Girgsdies, Frank1, Author              
Thomas, Nygil1, Author              
Behrens, Malte1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Thermogravimetry, Cu/Zn hydroxycarbonates, Decomposition kinetics
 Abstract: A combination of thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) coupled to mass spectrometry has been applied to study the thermal decomposition of Cu/Zn hydroxycarbonates, which are used as a precursor for the active methanol synthesis catalyst. Original TG and DSC profiles and results of a formal kinetic analysis of the calcination process are compared with transformations occurring in the solid phase, which has been studied by means of in-situ XRD. A series of hydroxycarbonate precursors with different Cu/Zn molar ratios (40/60, 70/30, 80/20) was synthesized under conditions reported as optimum for catalytic performance. The samples contain primarily two crystalline phases, aurichalcite (Cu,Zn)5(CO3)2(OH)6 and zincian malachite (Cu,Zn)2CO3(OH)2. At least four formal decomposition stages of CO2 and H2O evolution cause the major mass loss in the TG experiments. The best-fit quality for the all studied samples was obtained for a four-step competitive reaction model. The experimental TG dependences are adequately described by the n-th order equation and 3D Jander diffusion equation. The effects of the gas flow, sample mass, and water transfer conditions on the reaction pathway were studied. The presence of H2O vapor in the reaction feed accelerates the decomposition and dramatically changes the reaction TG profile. The decomposition enthalpy of mixed Cu/Zn (80/20) hydroxycarbonate was determined, and the formation enthalpy of the decomposition intermediate, a carbonate-modified oxide, was calculated to be ΔHf0=-633.7±5.6 kJ/mol.

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Language(s): eng - English
 Dates: 2014-04-112014-02-232014-04-262014-05-022014-09-10
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.tca.2014.04.025
 Degree: -

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Title: Thermochimica Acta
  Other : Thermochim. Acta
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 591 Sequence Number: - Start / End Page: 1 - 9 Identifier: ISSN: 0040-6031
CoNE: https://pure.mpg.de/cone/journals/resource/954925449791