Supported Ni Catalysts from Ni-Mg-Al Hydrotalcite-like Compounds：Preparation and Catalytic Performance for Ammonia Decomposition

. (a) HAADF-STEM image, (b-f) EDX elemental mappings, (g) TEM image, (h) HRTEM image, and (i) Ni particle size distribution for the Ni₂₀Mg₅₅Al₂₅ catalyst reduced at 750 ℃ with NH₃

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. Catalytic ammonia decomposition over the Ni_xMg_75-_xAl₂₅ catalysts

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. (A) Catalytic activities at different space velocities and (B) long-term stability of Ni₂₀Mg₅₅Al₂₅ (pre-reduced with NH₃ at 750 ℃), and (C) XRD patterns of the fresh and used Ni₂₀Mg₅₅Al₂₅

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Table 1. Metal contents and lattice parameters of the Ni_xMg_75-_xAl₂₅ HTlc precursors

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Table 1. Metal contents and lattice parameters of the Ni_xMg_75-_xAl₂₅ HTlc precursors

Sample	Metal content/(%, in atom)			Lattice parameter/nm
Sample	Ni	Mg	Al	a	c
Ni₅Mg₇₀Al₂₅-HTlc	5.5	68.1	26.4	0.306	2.344
Ni₁₀Mg₆₅Al₂₅-HTlc	10.4	63.1	26.5	0.305	2.344
Ni₁₅Mg₆₀Al₂₅-HTlc	15.9	58.4	25.7	0.306	2.344
Ni₂₀Mg₅₅Al₂₅-HTlc	20.5	53.5	26.0	0.305	2.344
Ni₂₅Mg₅₀Al₂₅-HTlc	25.6	48.9	25.5	0.305	2.347

Table 2. Textural properties of the calcined samples and crystallite size of Ni metal in the reduced catalysts

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Table 2. Textural properties of the calcined samples and crystallite size of Ni metal in the reduced catalysts

Sample	Surface area/(m²·g_cat^-1)	Pore volume/(cm³·g_cat^-1)		Ni crystal size/nm
Ni₅Mg₇₀Al₂₅	197.3	0.45	7.5	7.7
Ni₁₀Mg₆₅Al₂₅	173.0	0.31	5.6	7.6
Ni₁₅Mg₆₀Al₂₅	217.4	0.36	5.6	5.9
Ni₂₀Mg₅₅Al₂₅	218.6	0.38	5.5	5.9
Ni₂₅Mg₅₀Al₂₅	204.4	0.43	7.0	6.7

Table 3. Catalytic performance of Ni catalysts for ammonia decomposition

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Table 3. Catalytic performance of Ni catalysts for ammonia decomposition

Catalyst	Feed gas	Space velocity/(mL·g_cat^-1·h^-1)	Temperature/℃	NH₃ conversion/%	NH₃ reaction rate/(mmol· g_cat^-1·min^-1)	Ref.
Ni₂₀Mg₅₅Al₂₅	Pure NH₃	30000	550	68.5	15.3	This work
NiCe_0.85Zr_0.15O	Pure NH₃	30000	550	63	14.1	[33]
Ni/cCeO₂(IMP)	Pure NH₃	30000	550	51	11.4	[34]
Ni_MgAl(6:1)	Pure NH₃	30000	550	48	10.7	[26]
Ni/MCM-41(TIE)	Pure NH₃	30000	550	47.6	10.6	[31]
Ni/BaZrO₃	Pure NH₃	20000	550	62	9.2	[29]
Ni_1.2Ce_0.1Al	Pure NH₃	45000	550	26	8.7	[32]
Ni/La₂O₃	Pure NH₃	6000	550	78.9	3.5	[30]

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Minli LIAN, Jiaxin SU, Hongyang HUANG, Yuyin JI, Haifan DENG, Tong ZHANG, Chongqi CHEN, Dalin LI. Supported Ni Catalysts from Ni-Mg-Al Hydrotalcite-like Compounds：Preparation and Catalytic Performance for Ammonia Decomposition[J]. Journal of Inorganic Materials, 2025, 40(1): 53

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Paper Information

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Received: Mar. 22, 2024

Accepted: --

Published Online: Apr. 24, 2025

The Author Email: Minli LIAN (975216049@qq.com)

DOI:10.15541/jim20240140

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Metal contents and lattice parameters of the NixMg75-xAl25 HTlc precursors

Table 1. Metal contents and lattice parameters of the NixMg75-xAl25 HTlc precursors

Table 2. Textural properties of the calcined samples and crystallite size of Ni metal in the reduced catalysts

Table 2. Textural properties of the calcined samples and crystallite size of Ni metal in the reduced catalysts

Table 3. Catalytic performance of Ni catalysts for ammonia decomposition

Table 3. Catalytic performance of Ni catalysts for ammonia decomposition

Table 1. Metal contents and lattice parameters of the Ni_xMg_75-_xAl₂₅ HTlc precursors

Table 1. Metal contents and lattice parameters of the Ni_xMg_75-_xAl₂₅ HTlc precursors