Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization

Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization Full article

Journal

Catalysts
, E-ISSN: 2073-4344

Output data

Year: 2023, Volume: 13, Number: 4, Article number : 678, Pages count : 14 DOI: 10.3390/catal13040678

Tags

nickel catalysts; hydrotalcite-derived catalysts; Ni-Mg-Al-double layered hydroxides Ni-Mg-Al mixed oxide; ammonia decomposition; H2 production

Authors

Fedorova Zaliya A. ^1,2 , Borisov Vadim A. ^3,4 , Pakharukova Vera P. ² , Gerasimov Evgeniy Y. ² , Belyaev Vladimir D. ^1,2 , Gulyaeva Tatyana I. ³ , Shlyapin Dmitriy A. ³ , Snytnikov Pavel V. ²

Affiliations

1	Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630128, Russia
2	Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk 630090, Russia
3	Center of New Chemical Technologies BIC, Boreskov Institute of Catalysis SB RAS, Neftezavodskaya St. 54, Omsk 644040, Russia
4	Petrochemical Institute, Omsk State Technical University, Prospect Mira 11, Omsk 644050, Russia

Funding (1)

Ministry of Science and Higher Education of the Russian Federation

0239-2021-0011

Layered Ni-Mg-Al hydroxides with (Ni + Mg)/Al = 2.5 differing in Mg/Ni ratios and related oxide systems have been synthesized and characterized. Ni-Mg-Al hydroxides were prepared by the coprecipitation method. It was found that the samples dried at 110 °C were layered Ni-Mg-Al hydroxides with a hydrotalcite-type structure. After the heat treatment at 600 °C, the formation of Ni-Mg-Al-mixed oxides with a specific nanostructure, an intermediate between a NaCl and spinel structure, took place. According to XRD data, it had the unit cell parameter a = 4.174–4.181 Å, and a crystallite size of 4.0 nm. The specific surface area of the Ni-Mg-Al samples dried at 110 °C was 45–54 m2/g, and that of those calcined at 600 °C was 156.1–209.1 m2/g. In agreement with HRTEM data, in all the synthesized nickel catalysts reduced at 700 °C (H2), particle size was mainly distributed between 15–20 nm. The catalyst activity of LDH-derived Ni-Mg-Al catalysts in ammonia decomposition was studied in a fixed-bed flow-type reactor at an atmospheric pressure within the temperature range 500–700 °C. The synthesized catalysts overcame existing analogues in catalytic performance. At a process temperature of 500 °C, the Ni2Mg3Al2-HT catalyst showed that the H2 productivity was 23.8 mmol/(gcat·min), exceeding the respective value of nickel catalysts reported in the literature.

Fedorova Z.A. , Borisov V.A. , Pakharukova V.P. , Gerasimov E.Y. , Belyaev V.D. , Gulyaeva T.I. , Shlyapin D.A. , Snytnikov P.V.
Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization
Catalysts. 2023. V.13. N4. 678 :1-14. DOI: 10.3390/catal13040678 WOS Scopus РИНЦ OpenAlex

Submitted:	Feb 15, 2023
Accepted:	Mar 27, 2023
Published print:	Mar 30, 2023
Published online:	Mar 30, 2023

Web of science:	WOS:000977656900001
Scopus:	2-s2.0-85153962527
Elibrary:	53958878
OpenAlex:	W4362468819

DB	Citing
Web of science	1
OpenAlex	3
Scopus	2