Metal elution from Ni- and Fe-based alloy reactors under hydrothermal conditions

Faisal, Muhammad; Quitain, Armando T.; Urano, Shinya; Daimon, Hiroyuki; Fujie, Koichi

doi:10.1016/j.jhazmat.2004.02.028

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…1). The rapid decarboxylation rate of glycine is due, in part, to the fact that this type of work is usually performed in highly reactive metal reactors where it is difficult to control variables that affect biomolecule stability, such as reactor wall catalysis (Brill, 2000), reactor corrosion (Maslar et al, 2002), as well as metal elution (Faisal et al, 2004). Note that a similar surface effect has recently been observed for glycine but also for other amino acids such as alanine (Cox and Seward, 2007).…”

Section: Resultsmentioning

confidence: 88%

Peptide Synthesis in Early Earth Hydrothermal Systems

2009

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We report here results from experiments and thermodynamic calculations that demonstrate a rapid, temperature-enhanced synthesis of oligopeptides from the condensation of aqueous glycine. Experiments were conducted in custom-made hydrothermal reactors, and organic compounds were characterized with ultraviolet-visible procedures. A comparison of peptide yields at 260 degrees C with those obtained at more moderate temperatures (160 degrees C) gives evidence of a significant (13 kJ . mol(-1)) exergonic shift. In contrast to previous hydrothermal studies, we demonstrate that peptide synthesis is favored in hydrothermal fluids and that rates of peptide hydrolysis are controlled by the stability of the parent amino acid, with a critical dependence on reactor surface composition. From our study, we predict that rapid recycling of product peptides from cool into near-supercritical fluids in mid-ocean ridge hydrothermal systems will enhance peptide chain elongation. It is anticipated that the abundant hydrothermal systems on early Earth could have provided a substantial source of biomolecules required for the origin of life.

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Section: Resultsmentioning

confidence: 88%

Peptide Synthesis in Early Earth Hydrothermal Systems

2009

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Catalytic effect of different reactor materials under subcritical water conditions: decarboxylation of cysteic acid into taurine

Faisal

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In order to understand the influence of reactor materials on the catalytic effect for a particular reaction, the decomposition of cysteic acid from Ni/Fe-based alloy reactors under subcritical water conditions was examined. Experiments were carried out in three batch reactors made of Inconel 625, Hastelloy C-22 and SUS 316 over temperatures of 200 to 300 ℃. The highest amount of eluted metals was found for SUS 316. The results demonstrated that reactor materials contribute to the resulting product. Under the tested conditions, cysteic acid decomposes readily with SUS 316. However, the Ni-based materials (Inconel 625 and Hastelloy C-22) show better resistance to metal elution. It was found that among the materials used in this work, SUS 316 gave the highest reaction rate constant of 0.1934 s−1. The same results were obtained at temperatures of 260 and 300 ℃. Investigation of the Arrhenius activation energy revealed that the highest activation energy was for Hastelloy C-22 (109 kJ/mol), followed by Inconel 625 (90 kJ/mol) and SUS 316 (70 kJ/mol). The decomposition rate of cysteic acid was found to follow the results for the trend of the eluted metals. Therefore, it can be concluded that the decomposition of cysteic acid was catalyzed by the elution of heavy metals from the surface of the reactor. The highest amount of taurine from the decarboxylation of cysteic acid was obtained from SUS 316.

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Metal elution from Ni- and Fe-based alloy reactors under hydrothermal conditions

Cited by 2 publications

References 13 publications

Peptide Synthesis in Early Earth Hydrothermal Systems

Peptide Synthesis in Early Earth Hydrothermal Systems

Catalytic effect of different reactor materials under subcritical water conditions: decarboxylation of cysteic acid into taurine

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