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Facile preparation of nickel-poor layered double hydroxides from mechanochemically pretreated gibbsite with a variety of interlamellar anions and their use as catalyst precursors for CO2 hydrogenation

Szabados, Márton and Szabados, Tamara and Mucsi, Róbert and Sápi, András and Kónya, Zoltán and Kukovecz, Ákos and Pálinkó, István and Sipos, Pál Miklós (2023) Facile preparation of nickel-poor layered double hydroxides from mechanochemically pretreated gibbsite with a variety of interlamellar anions and their use as catalyst precursors for CO2 hydrogenation. MATERIALS RESEARCH BULLETIN, 157. No. 112010. ISSN 0025-5408

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Abstract

A simple synthetic route of preparing NiAl4-layered double hydroxides (LDHs) was developed. First, Al(OH)3 was pretreated by using high-energy dry-milling. This was followed by impregnation with moderately concentrated aqueous Ni-salt solutions with different counter anions under mild conditions. Using this protocol, beside the already known NiAl4-LDHs with chloride, nitrate, sulfate interlamellar anions, bromide, iodide, perchlorate and sulfamate ion intercalated versions were also possible to be prepared for the first time. Catalysts obtained from these LDHs proved to be active in CO2 hydrogenation reaction. The quality of interlayer anions was found to exert a profound effect on the topotactic transformation of LDHs, the in situ reduction of nickel and the formation of spinel-type oxides. Catalysts from sulfate and sulfamate containing NiAl4-LDHs possessed outstandingly high (>90 %) CO selectivity independently from the reaction temperatures, while those obtained from nitrate and perchlorate containing LDHs facilitated mostly and robustly the formation of methane.

Item Type: Article
Subjects: Q Science / természettudomány > QD Chemistry / kémia
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 26 Sep 2022 06:48
Last Modified: 26 Sep 2022 06:48
URI: http://real.mtak.hu/id/eprint/149653

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