Characterization and catalytic properties of the CuO/SiO2 catalysts prepared by precipitation-gel method in the hydrogenolysis of glycerol to 1,2-propanediol: Effect of residual sodium

Huang, Zhiwei; Cui, Fang; Kang, Haixiao; Chen, Jing; Xia, Chungu

doi:10.1016/j.apcata.2009.07.017

Cited by 107 publications

(81 citation statements)

References 42 publications

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“…In the case of CuAg/Al catalysts, 2-propanol and ethanol were produced in small amounts. These compounds are secondary C-C hydrogenolysis (degradation) products [3] formed via the mechanism described in the ''Introduction'' [9,10]. However, 2-hydroxyacrolein and glyceraldehyde were present among the products detected in the catalytic tests carried out with the CuAg/Ti catalysts (Table 4).…”

Section: Results Of Catalytic Activity Measurements In Hydrogenolysismentioning

confidence: 91%

“…Noble-metal-based catalysts exhibit high activity in glycerol hydrogenolysis reaction, but their selectivity for 1,2-propanediol is low [10]. Another disadvantage of noble-metal catalysts is their high cost.…”

Section: Introductionmentioning

confidence: 99%

“…This reaction (Scheme 1) is considered as a two-or threestep reaction, depending on the acido-basic conditions: (1) dehydration of glycerol to acetol in the first step, followed by hydrogenation of intermediate in the second step to 1,2-propanediol [10], or (2) dehydrogenation to glyceraldehydes, followed by dehydration to 2-hydroxyacrolein and hydrogenation to desired propanediol [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the carrier and composition of active phase on physicochemical and catalytic properties of CuAg/oxide catalysts for selective hydrogenolysis of glycerol

et al. 2015

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The aim of the present study is to investigate the influence of the support and composition of the active bimetallic phase on both the physicochemical and catalytic properties of catalysts for use in glycerol hydrogenolysis reaction. Two series of catalysts with different amounts of copper oxide and/or silver supported on Al 2 O 3 or TiO 2 oxides were prepared. To determine the physicochemical properties of the catalysts, the following techniques were used: Brunauer-Emmett-Teller, reactive N 2 O adsorption, X-ray diffraction, and temperature-programmed reduction TPR-H 2 . Physicochemical characterization revealed that addition of silver modifies the redox properties of the catalysts containing copper oxide and influences their specific surface area. It was found that the type of carrier determines the catalytic activity and selectivities for desired products, strongly influencing their distribution. The Al 2 O 3 -supported catalysts were much more selective for 1,2-propanediol, whereas 1-propanol was the main reaction product for the titania-supported catalysts. The best catalysts (6Cu/Al and 2Cu/Ti) achieved 38 % glycerol conversion with 71 % selectivity for 1,2-propanediol and 44 % conversion with 62 % selectivity for 1-propanol, respectively.

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Section: Results Of Catalytic Activity Measurements In Hydrogenolysismentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the carrier and composition of active phase on physicochemical and catalytic properties of CuAg/oxide catalysts for selective hydrogenolysis of glycerol

et al. 2015

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“…During the last decades, this type of catalyst has drawn a considerable amount of attention because of its remarkable redox activity, high recyclability and low cost [6,7]. This leads to its application in various reactions, for instance hydrogenolysis of glycerol to 1,2-propanediol [8][9][10], hydrogenation of dimethyl oxalate [11][12][13] and methanol synthesis [14][15][16]. However, in order to use copper as an active element for automotive emission control, two major limitations should be considered and overcome.…”

Section: Introductionmentioning

confidence: 99%

Comparison between a Water-Based and a Solvent-Based Impregnation Method towards Dispersed CuO/SBA-15 Catalysts: Texture, Structure and Catalytic Performance in Automotive Exhaust Gas Abatement

et al. 2016

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Supported copper oxide nanoparticles are a potential candidate for replacing the rare and expensive precious metals within the automotive three-way catalyst. However, a well-designed dispersion method is necessary to allow a stable high loading of active material, compensating its lower intrinsic activity and stability. In this work, a CuO-loaded SBA-15 catalyst has been manufactured by two methods. The ammonia-driven deposition precipitation (ADP) and the molecular designed dispersion (MDD) methods are both considered as efficient deposition methods to provide well-dispersed copper oxide-based catalysts. Their morphology, copper dispersion and the chemical state of copper were characterized and compared. Due to the differences in the synthesis approach, a difference in the obtained copper oxide phases has been observed, leading to a distinct behavior in the catalytic performance. The structure-activity correlation of both catalysts has also been revealed for automotive exhaust gas abatement. Results demonstrate that various copper species can be formed depending on the precursor-support interaction, affecting selectivity and conversion during the catalytic reaction.

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“…6 With CuO/SiO 2 at 180 °C and 80 atm hydrogen pressure, the selectivity to propylene glycol was reported to be 90% and the conversion 25-30%. 7 Some authors have performed the hydrogenolysis of glycerol in two steps and over copper catalysts. 8 Some others have used acid materials as co-catalysts.…”

Section: Introductionmentioning

confidence: 99%

Selective hydrogenolysis of glycerol to propylene glycol in a continuous flow trickle bed reactor using copper chromite and Cu/Al2O3 catalysts

Sepúlveda¹,

Manuale²,

Santiago³

et al. 2017

Quim. Nova

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CATALYSTS. The glycerol hydrogenolysis reaction was performed in a continuous flow trickle bed reactor using a water glycerol feed and both copper chromite and Cu/Al 2 O 3 catalysts. The commercial copper chromite had a higher activity than the laboratory prepared Cu/Al 2 O 3 and was used for most of the tests. Propylene glycol was the main product with both catalysts, acetol being the main by-product. It was found that temperature is the main variable influencing the conversion of glycerol. When the state of the glycerol-water reactant mixture was completely liquid, at temperatures lower than 190 °C, conversion was low and deactivation was observed. At reaction temperatures of 210-230 °C the conversion of glycerol was complete and the selectivity to propylene glycol was stable at about 60-80% all throughout the reaction time span of 10 h, regardless of the hydrogen pressure level (1 to 20 atm). These optimal values could not be improved significantly by using other different reaction conditions or increasing the catalyst acidity. At higher temperatures (245-250 °C) the conversion was also 100%. Under reaction conditions at which copper chromite suffered deactivation, light by-products and surface deposits were formed. The deposits could be completely burned at 250 °C and the catalyst activity fully recovered.

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Characterization and catalytic properties of the CuO/SiO2 catalysts prepared by precipitation-gel method in the hydrogenolysis of glycerol to 1,2-propanediol: Effect of residual sodium

Cited by 107 publications

References 42 publications

Influence of the carrier and composition of active phase on physicochemical and catalytic properties of CuAg/oxide catalysts for selective hydrogenolysis of glycerol

Influence of the carrier and composition of active phase on physicochemical and catalytic properties of CuAg/oxide catalysts for selective hydrogenolysis of glycerol

Comparison between a Water-Based and a Solvent-Based Impregnation Method towards Dispersed CuO/SBA-15 Catalysts: Texture, Structure and Catalytic Performance in Automotive Exhaust Gas Abatement

Selective hydrogenolysis of glycerol to propylene glycol in a continuous flow trickle bed reactor using copper chromite and Cu/Al2O3 catalysts

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