Characterisation of high surface area nanocomposites for glycerol transformation: Effect of the presence of silica on the structure and catalytic activity

Barros, Francisco de Assis A.; Sousa, Helvio S.A. de; Manoel, C.; Filho, J. Mendes; Viana, Bartolomeu C.; Oliveira, Alcinéia C.

doi:10.1016/j.cattod.2012.09.013

Cited by 18 publications

(6 citation statements)

References 49 publications

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“…The presence of oxygen vacancies can be conrmed by the Raman mode at $646 cm À1 for CeMnO-773 catalyst. 35 However, for CeMnO-1073 catalyst, the peaks at $317, 363, and 653.9 cm À1 can be ascribed to the different phases such as Mn 3 O 4 and Mn 2 O 3 . 36 In particular, Mn 2 O 3 phase was detected by the XRD analysis indicating that Mn 2 O 3 was segregated from the mixed oxide at elevated temperatures, which is strongly supported by XRD results.…”

Section: Catalyst Activity Studiesmentioning

confidence: 97%

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Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

et al. 2015

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A nanostructured CeO 2 -MnO x catalyst was synthesized by a coprecipitation method and subjected to different calcination temperatures at 773 and 1073 K to understand the surface structure and the thermal stability. The structural and redox properties were deeply investigated by various techniques, namely, Xray diffraction (XRD), inductively coupled plasma-optical emission spectroscopy (ICP-OES), Brunauer-Emmett-Teller (BET) surface area, transmission electron microscopy (TEM), Raman spectroscopy (RS), hydrogen-temperature programmed reduction (H 2 -TPR), and X-ray photoelectron spectroscopy (XPS). The CeO 2 -MnO x catalyst calcined at 773 K was tested towards elemental mercury (Hg 0 ) oxidation and the achieved results are compared with the pure CeO 2 and MnO x . The XRD and TEM results confirmed the incorporation of Mn ions into the ceria lattice and the formation of a nanostructured solid solution, respectively. The RS and TPR results showed that the CeO 2 -MnO x catalyst exhibits more oxygen vacancies with superior redox ability over CeO 2 and MnO x . XPS analysis indicates that Ce and Mn existed in multiple oxidation states. Compared to pure CeO 2 and MnO x , the CeO 2 -MnO x catalyst exhibited greater Hg 0 oxidation efficiency (E oxi ) of 11.7, 33.5, and 89.6% in the presence of HCl, O 2 , and HCl/O 2mix conditions, respectively. The results clearly indicated that the HCl/O 2 -mix had a promotional effect on the catalytic Hg 0 oxidation. This was most likely due to the presence of surface oxygen species and oxygen vacancies being generated by a synergetic effect between CeO 2 and MnO x . In the presence of HCl, the CeO 2 -MnO x catalyst exhibited good adsorption efficiency (E ads ) of 92.4% over pure CeO 2 (46.5%) and MnO x (80.6%). It was found that increasing the operating temperature from 423 to 573 K resulted in considerable increase of E oxi and a decrease in the sorption of Hg 0 on the catalyst. .in; Tel: +61 3 9925 3365 † Electronic supplementary information (ESI) available: The chemical compositions of CeO 2 -MnO x mixed oxides, binding energies of spent catalysts, experimental diagram, calibration experiments for Hg 0 inlet , Ce 3d, O 1s, Mn 2p, Hg 4f and Cl 2p XPS spectra of spent catalysts calcined at 773 K. See

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Section: Catalyst Activity Studiesmentioning

confidence: 97%

“…25 Because of this, the cell parameter of ceria (5.41 Å) decreases to 5. 35 Å upon Mn doping (CeMnO-773 catalyst). These results imply that some manganese ions were incorporated into the ceria lattice, leading to the formation of a solid solution between manganese and cerium oxides.…”

Section: Catalyst Activity Studiesmentioning

confidence: 99%

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

et al. 2015

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“…Among them, selective oxidation of glycerol to lactic acid at aqueous alkaline conditions at relatively low temperatures is feasible to resolve the timeconsuming of the process. Indeed, because of massive biodiesel production, the catalytic conversion of raw glycerol to green bulk chemicals is an alternative route to transform the surplus of the tri-alcohol [3,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of lactic acid from glycerol using a Pd/C catalyst

Marques

Oliveira

Filho

et al. 2015

Fuel Processing Technology

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“…Researchers pointed out that the formation of 29 is favored on basic sites for Ce, Co, La and Ru oxide catalysts. 260,261,269,270 Similarly, Auroux et al showed that reducing the concentration and strength of acid sites promoted the formation of acetol on calcium phosphate systems. 271 Suprun and Papp pointed out that transition metal oxides supported on Al 2 O 3 −PO 4 with low acidity were more favorable for acetol formation.…”

Section: Carbonation Into Propylenementioning

confidence: 99%

“…In some examples, molecular hydrogen was co-fed with glycerol. Co-feeding hydrogen promoted the dehydration reaction and inhibited the formation of coke, thus preventing catalyst deactivation. , Silver-, aluminum-, cerium-, ,− chromium-, copper-, ,,− and lanthanum- , as well as cobalt- and ruthenium-based catalysts were reported as efficient heterogeneous catalysts for the reaction. The most relevant catalysts and optimized conditions for hydroxyacetone formation are summarized in Table .…”

Section: Upgrading Of Polyolsmentioning

confidence: 99%

Continuous Flow Upgrading of Selected C₂–C₆Platform Chemicals Derived from Biomass

et al. 2020

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The ever increasing industrial production of commodity and specialty chemicals inexorably depletes the finite primary fossil resources available on Earth. The forecast of population growth over the next 3 decades is a very strong incentive for the identification of alternative primary resources other than petro-based ones. In contrast with fossil resources, renewable biomass is a virtually inexhaustible reservoir of chemical building blocks. Shifting the current industrial paradigm from almost exclusively petro-based resources to alternative bio-based raw materials requires more than vibrant political messages; it requires a profound revision of the concepts and technologies on which industrial chemical processes rely. Only a small fraction of molecules extracted from biomass bears significant chemical and commercial potentials to be considered as ubiquitous chemical platforms upon which a new, bio-based industry can thrive. Owing to its inherent assets in terms of unique process experience, scalability, and reduced environmental footprint, flow chemistry arguably has a major role to play in this context. This review covers a selection of C2 to C6 bio-based chemical platforms with existing commercial markets including polyols (ethylene glycol, 1,2-propanediol, 1,3-propanediol, glycerol, 1,4-butanediol, xylitol, and sorbitol), furanoids (furfural and 5-hydroxymethylfurfural) and carboxylic acids (lactic acid, succinic acid, fumaric acid, malic acid, itaconic acid, and levulinic acid). The aim of this review is to illustrate the various aspects of upgrading bio-based platform molecules toward commodity or specialty chemicals using new process concepts that fall under the umbrella of continuous flow technology and that could change the future perspectives of biorefineries.

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Characterisation of high surface area nanocomposites for glycerol transformation: Effect of the presence of silica on the structure and catalytic activity

Cited by 18 publications

References 49 publications

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

Synthesis of lactic acid from glycerol using a Pd/C catalyst

Continuous Flow Upgrading of Selected C₂–C₆Platform Chemicals Derived from Biomass

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Characterisation of high surface area nanocomposites for glycerol transformation: Effect of the presence of silica on the structure and catalytic activity

Cited by 18 publications

References 49 publications

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO2–MnOx catalyst

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO2–MnOx catalyst

Synthesis of lactic acid from glycerol using a Pd/C catalyst

Continuous Flow Upgrading of Selected C2–C6Platform Chemicals Derived from Biomass

Contact Info

Product

Resources

About

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

Catalytic oxidation and adsorption of elemental mercury over nanostructured CeO₂–MnO_x catalyst

Continuous Flow Upgrading of Selected C₂–C₆Platform Chemicals Derived from Biomass