Infrared evolved gas analysis during thermal investigation of lanthanum, europium and samarium carbonates

Paama, Lilli; Pitkänen, Ilkka; Halttunen, H.; Perämäki, Paavo

doi:10.1016/s0040-6031(03)00038-8

Cited by 16 publications

(6 citation statements)

References 18 publications

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“…Studying La 2 (C 2 O 4 ) 3 decomposition, Vanhoyland et al [15] identified the presence of lanthanum oxycarbonate in the 800-873 K temperature range. The thermal analysis of La 2 (CO 3 ) 3 decomposition in nitrogen atmosphere showed that the decarbonisation process of La 2 O 2 CO 3 took place at 1043 K [16]. In La 2 (C 2 O 4 ) 3 and La 2 (CO) 3 decomposition, proceeding via intermediate oxycarbonates, the mechanism was not sensitive to the atmosphere [15,16].…”

Section: Lanthanum Phasesmentioning

confidence: 99%

Effects of rhodium and platinum on the reactivity of lanthanum phases

Irusta

Cornaglia

Lombardo

2004

Materials Chemistry and Physics

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Section: Lanthanum Phasesmentioning

confidence: 99%

Effects of rhodium and platinum on the reactivity of lanthanum phases

Irusta

Cornaglia

Lombardo

2004

Materials Chemistry and Physics

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“…In the third stage, most organics decomposed forming small molecules. The detected peaks of the RMS or Gram–Schmidt (GS) intensity profiles of the total evolved gases were successfully used in the FT-IR experiment in parallel with the TG curves (Paama et al, 2003, Suuronen et al, 2002). The RMS profile indicated that the major decomposition of NMF–WPCB occurred at 315°C and 968°C.…”

Section: Resultsmentioning

confidence: 99%

Pyrolysis treatment of nonmetal fraction of waste printed circuit boards: Focusing on the fate of bromine

Xiong

et al. 2020

Waste Manag Res

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Advanced thermal treatment of electronic waste offers advantages of volume reduction and energy recovery. In this work, the pyrolysis behaviour of nonmetallic fractions of waste printed circuit boards was studied. The fate of a bromine and thermal decomposition pathway of nonmetallic fractions of waste printed circuit boards were further probed. The thermogravimetric analysis showed that the temperatures of maximum mass loss were located at 319°C and 361°C, with mass loss of 29.6% and 50.6%, respectively. The Fourier transform infrared Spectroscopy analysis revealed that the spectra at temperatures of 300°C–400°C were complicated with larger absorbance intensity. The nonmetallic fractions of waste printed circuit boards decomposed drastically and more evolved products were detected in the temperature range of 600°C–1000°C. The gas chromatography–mass spectrometry analysis indicated that various brominated derivates were generated in addition to small molecules, such as CH4, H2O and CO. The release intensity of CH4 and H2O increased with temperature increasing and reached maximum at 600°C–800°C and 400°C–600°C. More bromoethane (C2H5Br) was formed as compared with HBr and methyl bromide (CH3Br). The release intensity of bromopropane (C3H7Br) and bromoacetone (C3H5BrO) were comparable, although smaller than that of bromopropene (C3H5Br). More dibromophenol (C6H4Br2O) was released than that of bromophenol (C6H5BrO) in the thermal treatment. During the thermal process, part of the ether bonds first ruptured forming bisphenol A, propyl alcohol and tetrabromobisphenol A. Then, the tetrabromobisphenol A decomposed into C6H5BrO and HBr, which further reacted with small molecules forming brominated derivates. It implied debromination of raw nonmetallic fractions of waste printed circuit boards or pyrolysis products should be applied for its environmentally sound treating.

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“…Traces of CuO (tenorite) were observed. According to the preset La/Cu molar ratio, the presence of tenorite should be accompanied by an equivalent amount of lanthanum in the form of oxide or oxocarbonate [19]. Although no evidence of other crystalline phases was observed, this does not exclude the presence of the lanthanum species, as they could be amorphous.…”

Section: Crystallographic Determinationsmentioning

confidence: 96%

“…Therefore, in the DSC graphic the endothermic peak at about 100 °C could be related to the loss of five H 2 O molecules, while the other endothermic peaks at 300, 500°C and the two broad peaks in the temperature range 550-800°C to the loss of CO 2 . To be noted that a TG-DSC study of hydrated La 2 (CO 3 ) 3 reports the ultimate CO 2 release between 525 and 770 °C, assigned to the loss of CO 2 by La 2 O 2 (CO 3 ) [19]. A sample of La2Cu-Car was heated in a furnace in air at 400 °C for 6 h, turning black.…”

Section: Crystallographic Determinationsmentioning

confidence: 99%

A convenient preparation of La2CuO4 from molecular precursors

et al. 2017

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Exhaustive hydrolysis of a mixture of [La4(CO3)(O2CNBu2)10] and [Cu(O2CNBu2)(py∗)2] (py∗ = 4-dimethylamino pyridine) in molar ratio 1/2 corresponding to a La/Cu molar ratio 2/1 was carried out in toluene at room temperature. The carbamato derivatives of lanthanum and copper can be easily prepared by extraction of the metal ions from aqueous solution into heptane by the NHBu2/CO2 system, according to a method previously reported. The copper precursor was selected among a number of derivatives in respect of its easy tractability. The tetragonal modification T’ of La2CuO4 was obtained by treatment at 600 °C of the intermediate mixed carbonate. The thermal treatment of T’-La2CuO4 at 850 °C, followed by cooling down to room temperature, afforded the orthorhombic modification of the mixed oxide

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Infrared evolved gas analysis during thermal investigation of lanthanum, europium and samarium carbonates

Cited by 16 publications

References 18 publications

Effects of rhodium and platinum on the reactivity of lanthanum phases

Effects of rhodium and platinum on the reactivity of lanthanum phases

Pyrolysis treatment of nonmetal fraction of waste printed circuit boards: Focusing on the fate of bromine

A convenient preparation of La2CuO4 from molecular precursors

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