Framework of ruthenium-containing nickel hydrotalcite-type material: preparation, characterisation, and its catalytic application

Sreenavya, A.; Baskaran, Thangaraj; Ganesh, V.; Sharma, Dhanjay; Kulal, Nagendra; Sakthivel, A.

doi:10.1039/c8ra03506g

Cited by 34 publications

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“…Thus, under reaction conditions, more than 70% of nickel is reduced in samples obtained from complexes with nitrate anions, and only 30% of the reduced metal contains the Ni-3En-ClO 4 catalyst after activation. Such a low degree of nickel reduction may be due to the presence of nickel hydroxide in the sample, which has a higher reduction temperature than nickel oxide [ 62 ]: NiO + H 2 → Ni + H 2 O 250–400 °C Ni(OH) 2 + H 2 → Ni + 2H 2 O 350–600 °C …”

Section: Resultsmentioning

confidence: 99%

CO2 Methanation: Solvent-Free Synthesis of Nickel-Containing Catalysts from Complexes with Ethylenediamine

et al. 2023

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CO2 methanation was studied in the presence of nickel catalysts obtained by the solid-state combustion method. Complexes with a varying number of ethylenediamine molecules in the coordination sphere of nickel were chosen as the precursors of the active component of the catalysts. Their synthesis was carried out without the use of solvents, which made it possible to avoid the stages of their separation from the solution and the utilization of waste liquids. The composition and structure of the synthesized complexes were confirmed by elemental analysis, IR spectroscopy, powder XRD and XPS methods. It was determined that their thermal decomposition in the combustion wave proceeds in multiple stages with the formation of NiO and Ni(OH)2, which are reduced to Ni0. Higher ethylenediamine content in the complex leads to a higher content of metal in the solid products of combustion. However, different ratios of oxidized and reduced forms of nickel do not affect the initial activation temperature of nickel catalysts in the presence of CO2. It was noted that, after activation, the sample obtained from [Ni(C2H8N2)2](NO3)2 exhibited the highest activity in CO2 methanation. Thus, this complex is a promising precursor for CO2 methanation catalysts, and its synthesis requires only a small amount of ethylenediamine.

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Section: Resultsmentioning

confidence: 99%

CO2 Methanation: Solvent-Free Synthesis of Nickel-Containing Catalysts from Complexes with Ethylenediamine

et al. 2023

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Modification of Ti‐doped Hematite Photoanode with Quasi‐molecular Cocatalyst: A Comparison of Improvement Mechanism Between Non‐noble and Noble Metals

et al. 2021

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Loading of molecular catalyst on the surface of semiconductors is an attractive way to boost the water oxidation activity. As active sites, molecular water oxidation cocatalysts show increasing attraction and application possibility. In order to compare the advantages between molecular catalysts with non-noble and noble metals, the loading of the Fe(salen) and Ru(salen) as cocatalyst precursors on the surface of TiÀ Fe 2 O 3 was investigated Quasi-Fe(salen) and Ru(salen) improved the photocurrent density by 1.5 and 1.7 times compared to that of the original TiÀ Fe 2 O 3 photoanode, respectively. The quasi-Fe(salen) could improve the conductivity and reaction kinetics on the photoanode surface. By contrast, the notable advancements could be attributed to more reaction sites for quasi-Ru(salen) as cocatalysts. Thus, non-noble quasi-Fe(salen) is a promising cocatalyst to replace the noble metal salen, and further optimization can be expected with regard to the precise control of reaction sites.

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Hydrodeoxygenation of Anisole by Using a Ruthenium‐Containing Nickel‐Iron Hydrotalcite‐Based Catalyst

Aswin

Sreenavya

Venkatesha³

et al. 2022

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Ruthenium-loaded nickel-iron (NiÀ Fe) hydrotalcite materials were synthesized via the co-precipitation method. The physicochemical properties of the synthesized materials were characterized by spectroscopic and analytical methods. The highly crystalline nature of NiÀ Fe HT (NiFe-0.5) hydrotalcite material was evident from powder XRD studies. The presence of uniformly dispersed ruthenium in its NiRu alloy form was evident from the TPR studies. The synthesized materials show promising catalytic performance for the hydrodeoxygenation (HDO) of anisole under ambient reaction conditions (190 °C, 20 bar H 2 ). The catalyst prepared with a nickel-to-iron molar ratio of 2 : 1 (NF0.5 A) exhibited a good hydrotalcite structure and moderate catalytic activity for the hydrotreatment of anisole. The catalytic activity was improved by the introduction of 4 wt. % ruthenium on the surface of NiÀ Fe hydrotalcite (NF0.5Ru), which shows 98 % anisole conversion with the selective formation of toluene as the major product. Catalytic activity remained for several consecutive runs. The recycled catalyst showed a similar conversion with the formation of toluene and methylcyclohexane as the major products. The variation in the selectivity might be due to the re-dispersion of NiÀ Ru active sites.

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Framework of ruthenium-containing nickel hydrotalcite-type material: preparation, characterisation, and its catalytic application

Abstract: The framework ruthenium-containing nickel (NiRu) hydrotalcite (HT)-type materials were prepared for the first time without organics and the resultant materials were found to be promising catalysts for nitro-benzene reduction.

Cited by 34 publications

References 57 publications

CO2 Methanation: Solvent-Free Synthesis of Nickel-Containing Catalysts from Complexes with Ethylenediamine

CO2 Methanation: Solvent-Free Synthesis of Nickel-Containing Catalysts from Complexes with Ethylenediamine

Modification of Ti‐doped Hematite Photoanode with Quasi‐molecular Cocatalyst: A Comparison of Improvement Mechanism Between Non‐noble and Noble Metals

Hydrodeoxygenation of Anisole by Using a Ruthenium‐Containing Nickel‐Iron Hydrotalcite‐Based Catalyst

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