Textural Properties and Catalytic Activity of Hydrotalcites

Tichit, Didier; Lhouty, Mohammed Hassane; Guida, A.; Chiche, Bich; Figuéras, F.; Auroux, A.; Bartalini, D.; Garrone, Edoardo

doi:10.1006/jcat.1995.1007

Cited by 250 publications

(121 citation statements)

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“…1. As TG analysis revealed, gradual weight loss was observed from about 50 • C to approximately 600 • C, with two main endothermic effects at about 173 and 410 • C. The first large endothermic effect at about 173 • C involved interlayer water loss [20]; the second endothermic effect at 410 • C accounted for hydrotalcite decomposition which was accompanied by dehydroxylation and the decomposition of CO 3 2− in the brucite-like layers [20]. Carbon dioxide evolution induced the formation of pores, which was the reason for the drastic increase in the specific surface area.…”

Section: Characterization Of Catalystmentioning

confidence: 99%

Effect of liquid property on adsorption and catalytic reduction of nitrate over hydrotalcite-supported Pd-Cu catalyst

Wang

Liu

2007

Journal of Molecular Catalysis A: Chemical

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This study focused on investigating the effect of liquid property on adsorption and catalytic reduction of nitrate over hydrotalcite-supported Pd-Cu catalyst. Batch experiments were conducted under specific operating conditions. It was found that nitrate ions were adsorbed apparently by hydrotalcite-supported Pd-Cu catalyst at different reaction temperature (10, 25 and 35• C). Adsorption isotherms for NO 3 − were described by Langmuir's equation. Higher reaction temperature accelerated nitrate adsorption and reduction, and simultaneously decreased the accumulation of NO 2 − and NH 4 + . Nitrate adsorption and reduction were independent of the initial pH because of the high buffering capacity of hydrotalcite when the initial pH of solution was from 5.25 to 7.4. However, the dissolve of hydrotalcite-supported Pd-Cu catalyst at low initial pH (3.77) and higher concentration of OH − ions at high initial pH (10.74) decreased nitrate adsorption and reduction. When using various nitrate salts as a source of nitrate ions, nitrate adsorption and reduction removal efficiency decreased in the order: Fe 3+ > Mn 2+ > Mg 2+ > Ca 2+ > Na + , which was attributed to different affinity toward OH − . Co-existed cations in water with higher valence and lower crystal ionic radius and solubility constant of hydroxide showed stronger affinity toward OH − and consequently increased the concentration of active sites accessible to NO 3 − and NO 2 − . The competitive adsorption of Cl − , SO 4 2− and HCO 3 − with nitrate on the catalyst surface suppressed the adsorption and reduction of NO 3 − . Besides, few metals dissolved in neutral and alkaline solution. The activity of the hydrotalcite-supported Pd-Cu catalyst for nitrate reduction kept steady after repeated use.

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Section: Characterization Of Catalystmentioning

confidence: 99%

Effect of liquid property on adsorption and catalytic reduction of nitrate over hydrotalcite-supported Pd-Cu catalyst

Wang

Liu

2007

Journal of Molecular Catalysis A: Chemical

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“…4,5 Although a number of attempts which employ catalysts was made to improve the condition, it however usually incorporates the use of harsh temperature. [6][7][8][9][10] In this work, a new organic-metal complex based …”

Section: Introductionmentioning

confidence: 99%

Aldol Condensation Reactions Effectively Catalysed by Lewis Acid

2017

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“…[5][6][7][8][9] The attention hydrotalcite-derived mixed oxides have gained is mainly due to the fact that their catalytic properties can be set and adjusted by the composition of the hydrotalcite precursors during synthesis. Parameters influencing the catalytic properties of hydrotalcite-derived mixed oxides are the nature and ratio of cations within the cationic layers and the nature of anions in the interlayer region of the hydrotalcite precursor as well as the temperature of thermal decomposition, [6,[10][11][12][13] which affects the basic site density. [14] The influence of the composition of brucite-type layers in hydrotalcite precursors on the catalytic activity of derived mixed oxides has already been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Tichit et al investigated the influence of the carbonate to chloride ratio in the hydrotalcite precursor on the catalytic activity of the derived mixed oxides in the condensation of benzaldehyde with acetone, and observed an increase thereof with raising carbonate content. [13] A further study was carried out by Kuśtrowski et al, which focused on the influence of four different inorganic anions and terephthalate on the surface properties and the catalytic activity of the derived mixed oxides in the reaction of 2-methyl-3-butyn-2-ol (MBOH). [6] Towards the goal of sustainable chemistry, transesterification reactions will become more and more important for the conversion of renewable resources, such as the production of biodiesel, [16] which has nearly doubled in Germany from 2005 to 2007.…”

Section: Introductionmentioning

confidence: 99%

Impact of Organic Interlayer Anions in Hydrotalcite Precursor on the Catalytic Activity of Hydrotalcite‐Derived Mixed Oxides

Meyer¹,

Roessner²,

Rakoczy³

et al. 2010

ChemCatChem

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A series of hydrotalcite‐derived mixed oxides containing different organic interlayer anions in the hydrotalcite precursors have been synthesized and studied as catalysts in the transesterification of glycerol trioctanoate with methanol. There are significant differences in the catalytic activity of these mixed oxides, indicating a great impact of interlayer anions in hydrotalcite precursors. Generally, anions with high charge density and, therefore, high content within the interlayer of the hydrotalcites lead to higher catalytic activity in the derived mixed oxides in contrast to anions with low charge density. An influence of interlayer anions on the structural properties of the hydrotalcites, such as interlayer distance, which is determined by X‐ray diffraction analysis, and on the surface area and pore volume of the corresponding mixed oxides, which are determined by nitrogen adsorption, is obtained. Furthermore, interlayer anions had a significant effect on the thermal stability of the hydrotalcite structure as well as on the pore size distribution of derived mixed oxides.

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Textural Properties and Catalytic Activity of Hydrotalcites

Cited by 250 publications

References 0 publications

Effect of liquid property on adsorption and catalytic reduction of nitrate over hydrotalcite-supported Pd-Cu catalyst

Effect of liquid property on adsorption and catalytic reduction of nitrate over hydrotalcite-supported Pd-Cu catalyst

Aldol Condensation Reactions Effectively Catalysed by Lewis Acid

Impact of Organic Interlayer Anions in Hydrotalcite Precursor on the Catalytic Activity of Hydrotalcite‐Derived Mixed Oxides

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