Influence of Cu, Co and Ni cations incorporated in brucite-type layers on thermal behaviour of hydrotalcites and reducibility of the derived mixed oxide systems

Chmielarz, Lucjan; Kuśtrowski, Piotr; Rafalska-Łasocha, Alicja; Dziembaj, R.

doi:10.1016/s0040-6031(02)00214-9

Cited by 106 publications

(67 citation statements)

References 31 publications

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“…Two DTG peaks appeared for the Cu-containing samples at higher temperatures. As it was shown in our previous studies [2], the peaks at 660 and 565°C found in the DTG curve of HT-Cu15 and HT-Cu10Co10 are related to the thermal decomposition of strongly stabilized structural CO 3 2-anions. Similar effect was reported for Cu-Mg-Al hydrotalcites by Auer et al [23].…”

Section: Catalytic Testssupporting

confidence: 74%

“…The thermal decomposition of hydrotalcites consists of few stages. A decrease of the samples weight that occurred at temperature below 250°C, assisted by endothermic peak (DTA), is associated with the removal of the interlayer and weakly adsorbed water molecules [2]. For all the studied samples nearly this same weight loss (12.6-13.6 wt%) in this stage was detected.…”

Section: Catalytic Testsmentioning

confidence: 70%

“…Hydrotalcites are layered double hydroxides (LDHs) which show the brucite-like network characteristic of [Mg(OH) 2 ]. In brucite, Mg 2?…”

Section: Introductionmentioning

confidence: 99%

“…Thermal decomposition of hydrotalcite-like materials at middle temperatures (T \ 600°C) results in the formation of the relatively high surface mixed metal oxides, with a high dispersion of introduced transition metals oxide species [2][3][4][5][6]. An increase in the calcination temperature results in the aggregation of these species and formation of the spinel phases [2][3][4][5][6]. Therefore, hydrotalcite-like materials are excellent precursors for the preparation of the metal oxide catalysts of the desired chemical and phase composition.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the prepared hydrotalcite-like materials were calcined at 600, 700, or 800°C for 6 h. The samples codes and the molar ratios of metals are shown in Table 1. A detailed description of the hydrotalcite preparation was presented in our previous papers [2,3].…”

Section: Introductionmentioning

confidence: 99%

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An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Chmielarz

Rutkowska

Kuśtrowski

et al. 2011

J Therm Anal Calorim

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Hydrotalcite-like materials containing apart from magnesium and aluminum also copper, cobalt, nickel, and iron were prepared by a co-precipitation method. Thermal transformations of hydrotalcite-like materials were studied by thermal analysis methods as well as XRD, UV-vis-DRS, and XPS measurements of the samples calcined at various temperatures (600, 700, and 800°C). Calcined hydrotalcites, especially those containing cobalt and copper, were found to be active and selective catalysts of N 2 O decomposition. It was shown that an increase in the calcination temperature significantly activated the Co-containing catalysts. Promotion of the samples with potassium resulted in activation of the hydrotalcite-based catalysts.

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Section: Catalytic Testssupporting

confidence: 74%

Section: Catalytic Testsmentioning

confidence: 70%

“…Hydrotalcites are layered double hydroxides (LDHs) which show the brucite-like network characteristic of [Mg(OH) 2 ]. In brucite, Mg 2?…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Chmielarz

Rutkowska

Kuśtrowski

et al. 2011

J Therm Anal Calorim

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Multifunctional Pd/Ni–Co Catalyst for Hydrogen Production by Chemical Looping Coupled With Steam Reforming of Acetic Acid

et al. 2014

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High yield of high-purity H2 from acetic acid, a model compound of bio-oil obtained from the fast pyrolysis of biomass, was produced by sorption-enhanced steam reforming (SESR). An oxygen carrier was introduced into a chemical loop (CL) coupled to the cyclical SESR process to supply heat in situ for the endothermic sorbent regeneration to increase the energy efficiency of the process. A new multifunctional 1 %Pd/20 %Ni-20 %Co catalyst was developed for use both as oxygen carrier in the CL and as reforming catalyst in the SESR whereas a CaO-based material was used as CO2 sorbent. In the sorbent-air regeneration step, the Ni-Co atoms in the catalyst undergo strong exothermic oxidation reactions that provide heat for the CaO decarbonation. The addition of Pd to the Ni-Co catalyst makes the catalyst active throughout the whole SESR-CL cycle. Pd significantly promotes the reduction of Ni-Co oxides to metallic Ni-Co during the reforming stage, which avoids the need for a reduction step after regeneration. H2 yield above 90 % and H2 purity above 99.2 vol % were obtained.

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Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Sherryna

Tahir

2021

Intl J of Energy Research

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Layered double hydroxides (LDHs) have received scientific attractions due to their unique two-dimensional (2D) structure, band gap tunability, and compositional flexibility, leading to the facile incorporation of the metal species into their layered structure. The main objective of this review is to explore the current advancement of LDH-based photocatalysts for photocatalytic hydrogen production by focusing on the role of divalent and trivalent metal incorporations and their efficiency enhancement. Firstly, the mechanism of photocatalysis and its thermodynamics has been explicated to gain basic understanding and fundamentals. Secondly, a brief introduction to the overview of LDH photocatalysts with special attention to the effects of cationic incorporations on the optical properties and computational study towards the electronic density has been demonstrated. Besides, the thermal stability of LDH is briefly discussed, focusing on the effects of temperature towards the conversion into mixed-metal oxide (MMO). Next, the classification of LDH based on divalent and trivalent cationic elements and their role in the brucite layer of LDH are systematically discussed. Attention is given to the mechanistic properties of the extensively studied metals, such as Mg, Ni, Zn, Co, Cr, Fe, V and Al, with the efficiency enhancements through various engineering aspects are demonstrated. The overview summary on the efficient design of LDH is elucidated to provide a deep understanding for improving their photocatalytic properties. Lastly, the future perspectives and recommendations are discussed to provide new insight into the potential of LDH and render them a notable place in solar energy applications.

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Influence of Cu, Co and Ni cations incorporated in brucite-type layers on thermal behaviour of hydrotalcites and reducibility of the derived mixed oxide systems

Cited by 106 publications

References 31 publications

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Multifunctional Pd/Ni–Co Catalyst for Hydrogen Production by Chemical Looping Coupled With Steam Reforming of Acetic Acid

Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

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