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Open AccessArticle

Catalytic Oxidation of Phosphine by Aqueous Copper–Ammonia Complexes

by Akbope K. Borangazieva, Yerzhan A. Boleubayev, Zhuldyz U. Ibraimova, Sholpan S. Itkulova and Gulshara S. Polimbetova

Catalysts 2023, 13(2), 271; https://doi.org/10.3390/catal13020271 - 25 Jan 2023

Cited by 1 | Viewed by 2713

Abstract

The furnace gas resulting from the electrothermal production of yellow phosphorus contains up to 95% CO, 2% O₂, 2% H₂, and 0.3–4.0% impurities, including phosphine (PH₃), yellow phosphorus (P₄), and hydrogen sulphide (H₂S), which are characterized by flammability, explosion hazardousness, corrosiveness, and high toxicity. The presence of toxic impurities does not allow the use of waste gases from phosphorus production, which are mainly composed of valuable carbon monoxide, as chemical raw materials and/or process fuel. The authors propose a method for the purification of furnace gas from the main toxic component, phosphine, by its oxidisation using aqueous copper–ammonia complexes as a catalyst. This approach allows the cleaning process to be conducted under mild conditions. The degree of purification of the model furnace gas from P components is 90–99%, depending on the process conditions. Full article

(This article belongs to the Special Issue Heterogeneous/Homogeneous Catalysis in Organic Synthesis – Recent Advances)

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24 pages, 4375 KiB

Open AccessArticle

Rhenium(VII) Compounds as Inorganic Precursors for the Synthesis of Organic Reaction Catalysts

by Katarzyna Leszczyńska-Sejda, Grzegorz Benke, Joanna Malarz, Mateusz Ciszewski, Dorota Kopyto, Jędrzej Piątek, Michał Drzazga, Patrycja Kowalik, Krzysztof Zemlak and Bartłomiej Kula

Molecules 2019, 24(8), 1451; https://doi.org/10.3390/molecules24081451 - 12 Apr 2019

Cited by 8 | Viewed by 4588

Abstract

Rhenium is an element that exhibits a broad range of oxidation states. Synthesis paths of selected rhenium compounds in its seventh oxidation state, which are common precursors for organic reaction catalysts, were presented in this paper. Production technologies for copper perrhenate, aluminum perrhenate as well as the ammonia complex of cobalt perrhenate, are thoroughly described. An ion exchange method, based on Al or Cu metal ion sorption and subsequent elution by aqueous perrhenic acid solutions, was used to obtain perrhenates. The produced solutions were neutralized to afford the targeted aluminum perrhenate and copper perrhenate products in high purity. The developed technologies allow one to manage the wastes from the production of these perrhenates as most streams were recycled. Hexaamminecobalt(III) perrhenate was produced by a newly developed method enabling us to produce a high purity compound in a reaction of spent hexaamminecobalt(III) chloride solution with a perrhenic acid. All prepared compounds are the basis for precursor preparation in organic catalysis. Full article

(This article belongs to the Section Inorganic Chemistry)

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