Liquid phase oxidation of limonene catalyzed by palladium supported on hydrotalcites

Bussi, Juan; López, Alejandro; Pena, F. N.; Timbal, Pablo; Paz, Daniel; Lorenzo, Daniel; Dellacasa, Eduardo

doi:10.1016/s0926-860x(03)00519-2

Cited by 26 publications

(28 citation statements)

References 19 publications

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“…Furthermore, limonene glycol and polymers decrease the selectivities to the desired compounds in that work [32]. Laborious and time consuming preparation and optimisation of synthetic hidrotalcites with immobilised palladium and copper in their compositions achieve similar conversions and selectivities to those found here, however reaction times up to 6 h were required in that case and palladium and copper, although quite reactive, are not very environmentally friendly [33].…”

Section: Sustainable Fine Chemicals From Agri Wastessupporting

confidence: 51%

Sustainable Materials and Biorefinery Chemicals from Agriwastes

Martín-Luengo¹,

Yates²,

Ramos³

et al. 2012

Resource Management for Sustainable Agriculture

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Section: Sustainable Fine Chemicals From Agri Wastessupporting

confidence: 51%

Sustainable Materials and Biorefinery Chemicals from Agriwastes

Martín-Luengo¹,

Yates²,

Ramos³

et al. 2012

Resource Management for Sustainable Agriculture

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“…The intensity was lower for the former sample. The first peak can be related to hydroxylated surface species whereas the second peak would correspond to oxide species obtained after the total decomposition of the hydroxide compounds [43,45]. The higher desorption temperature (648 K) and slight higher intensity observed for cHT2/723 could be explained by the presence of some defects in this sample, the precursor of which was prepared with microwaves.…”

Section: Acid-basic Propertiesmentioning

confidence: 88%

“…BET specific surface areas were lower (between 3 and 22 m 2 /g) than those of calcined HT (Table 2). This is surprising considering the amorphous character of the samples calcined at 723 K. However, it is important to take into account that at 723 K, dehydroxylation (loss of water) and anion decomposition (loss of chloride) is partial [29] compared to HTs [43]. This can explain their lower BET specific surface area values.…”

Section: Catalytic Testsmentioning

confidence: 96%

Influence of acid–base properties of calcined MgAl and CaAl layered double hydroxides on the catalytic glycerol etherification to short-chain polyglycerols

Pérez-Barrado

Pujol

Aguiló

et al. 2015

Chemical Engineering Journal

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h i g h l i g h t s• One-pot etherification reaction of glycerol towards short-chain polyglycerols.• Calcined MgAl-LDH and calcined CaAl-LDH were used as catalysts.• Basicity and acidity of the catalysts influenced the catalytic results.• Stronger basic sites and lower acidity favoured short-chain polyglycerols.• Higher temperature of calcination favoured a higher degree of polymerisation.g r a p h i c a l a b s t r a c t a b s t r a c t Several MgAl-LDHs (HT) and CaAl-LDHs (HC) were synthesized in different conditions and later calcined at 723 K, resulting in catalysts (cHT and cHC), with different acid-base properties. Calcined samples were tested in the etherification reaction of glycerol towards short-chain oligomers (di-to pentaglycerol). All catalysts were characterised by XRPD, ICP, N2 physisorption and TEM techniques. The basicity was evalKeywords: Glycerol etherification Short-chain polyglycerol CaAl layered double hydroxides MgAl layered double hydroxides Acid-base properties uated using the CO2-TPD technique and the acidity by cyclohexylamine adsorption. Catalytic results were correlated with catalysts properties. Catalysts with higher acidity showed higher conversion (96% for a cHT and 75% for a cHC) but also higher selectivity to other products, with main contribution of acrolein (88% for a cHT and 58% for a cHC). In contrast, catalysts with lower acidity resulted in lower conversion (24% for a cHT and 40% for a cHC) but higher selectivity towards di-and triglycerol (100% and 64%, respectively). The formation of triglycerol and other low-weight polyglycerols (tetra-and pentaglycerol) was favoured in catalysts with low acidity and strong basic sites. When the temperature of calcination was raised to 1073 K for one cHC, the acidity decreased and the number of strong basic sites increased, resulting in higher selectivity to triglycerol (20%), the formation of tetra-and pentaglycerol (15% and 6%, respectively) and the decrease of the acrolein amount.

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“…2 -8 Among these studies, a simple route involving a solvent-free reactant system with molecular oxygen as the sole oxidant agent and a solid catalyst has been reported. 8 Carveol, carvone and epoxylimonenes (Scheme 1) were found in significant amounts in the final products. Other non-identified compounds were also formed in minor amounts.…”

Section: Introductionmentioning

confidence: 99%

A clean process for the production of oxygenated limonene derivatives starting from orange oil

Arizaga

León

Burgueño

et al. 2007

J of Chemical Tech & Biotech

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The production of several oxygenated derivatives of limonene was carried out by using orange oil and molecular oxygen as the sole initial reactants under solvent-free conditions. Palladium-copper supported on carbon and hydrotalcite-like compounds displayed good catalytic properties to accelerate autoxidation reactions of limonene yielding a mixture of the different oxygenated derivatives, mainly 1,2-and 8,9-epoxylimonene, 1,2,8,9-diepoxylimonene, carveol and carvone. Palladium supported on copper-magnesium-aluminium hydrotalcite displayed the best properties due to its higher catalytic activity and lifetime. The pelletized form of these catalysts can be easily recovered and reused. A reactor design combining recirculation and oxygen bubbling through a catalytic bed of the pelletized catalyst produced the highest reaction rate. Vacuum distillation of the final product mixture allowed easy separation of the 1,2/8,9-limonene epoxides. The other required compounds, mainly carveol and carvone, were not completely separated and remained together with the other oxygenated products, such as the di-epoxylimonene isomers.

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Liquid phase oxidation of limonene catalyzed by palladium supported on hydrotalcites

Cited by 26 publications

References 19 publications

Sustainable Materials and Biorefinery Chemicals from Agriwastes

Sustainable Materials and Biorefinery Chemicals from Agriwastes

Influence of acid–base properties of calcined MgAl and CaAl layered double hydroxides on the catalytic glycerol etherification to short-chain polyglycerols

A clean process for the production of oxygenated limonene derivatives starting from orange oil

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