On the reasons for deactivation of titanate nanotubes with metals catalysts in the acetalization of glycerol with acetone

Gomes, Igor S.; Carvalho, Davi C.; Oliveira, Alcinéia C.; Rodríguez‐Castellón, Enrique; Tehuacanero-Cuapa, Samuel; Freire, Paulo; Filho, J. Mendes; Saraiva, G.D.; Sousa, Francisco F. de; Lang, Rossano

doi:10.1016/j.cej.2017.11.112

Cited by 38 publications

(37 citation statements)

References 45 publications

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“…However, the (110) peak in PtNT diffractogram shifts to the left compared with the other catalysts due to the presence of intercalated Pt into the NTs structure. In addition, some characteristic peaks of a minor platinum contribution coming from PtO x , PtO x Cl y or Pt(OH) x Cl y species are observed, as found elsewhere [ 25 , 26 ].…”

Section: Resultssupporting

confidence: 75%

“…X-ray diffraction (XRD) patterns of the solids are depicted in Figure 1 a. The pristine NaNT shows four diffraction peaks at 2θ equal to 10.1, 24.3, 28.7 and 48.3°, attributed to the 200, 110, 211 and 020 reflection planes, respectively [ 25 , 26 , 27 , 28 , 29 ]. All peaks shown in the NaNT diffractogram can be indexed to the P21/m space group from the monoclinic structure of Na 2 Ti 3 O 7 .…”

Section: Resultsmentioning

confidence: 99%

“…Titanate nanotubes (NTs) were synthesized by a hydrothermal method [ 2 , 25 ]. Typically, a solution containing 10 mol·L −1 of sodium hydroxide was added to two grams of TiO 2 anatase (25 mmol) with constant stirring.…”

Section: Experimental Partmentioning

confidence: 99%

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Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion

et al. 2021

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Effects of the incorporation of Cr, Ni, Co, Ag, Al, Ni and Pt cations in titanate nanotubes (NTs) were examined on the NOx conversion. The structural and morphological characterizations evidenced that the ion-exchange reaction of Cr, Co, Ni and Al ions with the NTs produced catalysts with metals included in the interlayer regions of the trititanate NTs whereas an assembly of Ag and Pt nanoparticles were either on the nanotubes surface or inner diameters through an impregnation process. Understanding the role of the different metal cations intercalated or supported on the nanotubes, the optimal selective catalytic reduction of NOx by CO reaction (SCR) conditions was investigated by carrying out variations in the reaction temperature, SO2 and H2O poisoning and long-term stability runs. Pt nanoparticles on the NTs exhibited superior activity compared to the Cr, Co and Al intercalated in the nanotubes and even to the Ag and Ni counterparts. Resistance against SO2 poisoning was low on NiNT due to the trititanate phase transformation into TiO2 and also to sulfur deposits on Ni sites. However, the interaction between Pt2+ from PtOx and Ti4+ in the NTs favored the adsorption of both NOx and CO enhancing the catalytic performance.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

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Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion

et al. 2021

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“…Gomes at al. [93] studied a catalyst containing PtO x and chlorined-Pt species dispersed on the alkali trititanate nanotube phase (TNT) in acetalization of glycerol with acetone. The authors proposed a reaction mechanism by which acetalization is initiated by the attack of the carbonyl group of acetone on Pt nanoparticles dispersed on the TNT structure.…”

Section: Heterogeneous Catalysts For Glycerol Acetalizationmentioning

confidence: 99%

Acetalization Catalysts for Synthesis of Valuable Oxygenated Fuel Additives from Glycerol

2018

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Biodiesel is one of the most attractive sources of clean energy. It is produced by the transformation of vegetable oils with up to 10% formation of glycerol as a by-product. Therefore, development of new approaches for processing bio-glycerol into such value-added chemical compounds as solketals is necessary. Thus, various six- and five-membered cyclic compounds can be prepared by acetalization of glycerol with aldehyde or ketone. The resulting glycerol oxygenates are excellent fuel additives that increase viscosity, octane or cetane number, and stability to oxidation. In addition, these products significantly reduce carbon monoxide emissions from standard diesel fuel. In this review, we highlight recent advances in the glycerol valorization for the sustainable production of bio-additives. The review includes a discussion of the innovative and potential catalysts to produce solketals.

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“…El oxígeno a bajos valores de energía de enlace (530 eV) indica un entorno inorgánico, formando oxido con el Zr, mientras que a mayores energías hace referencia a compuestos orgánico de la estructura del ácido aminotereftálico. Por último el nitrógeno, con una señal a los 400 eV en unión con el carbono del ligando orgánico (Gomes et al, 2018). A B…”

Section: Resultsunclassified

UiO-66-NH_2 para la obtención de ésteres levulínicos derivados de biomasa

Crivello¹,

Heredia²,

Castellón³

2020

AJEA

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Como resultado de la explotación masiva del petróleo y su agotamiento, el estudio de materias primas alternativas para reacciones orgánicas provenientes de la biomasa, es una tendencia de investigación en la actualidad. En este contexto, el presente trabajo plantea la obtención de metil y etil levulinato mediante la reacción catalítica de esterificación del ácido levulínico como molécula plataforma, con metanol y etanol. El catalizador utilizado es el MOF UiO-66-NH2, constituido por circonio como precursor metálico y ácido aminotereftálico como agente ligante orgánico. Se presenta una vía de síntesis con condiciones ambientales y económicas más favorables, utilizándose solventes alternativos. Se planteó el remplazo de la tradicional dimetilformamida (DMF), usada en la síntesis solvotermal, por un 50% v/v de acetona. Además, las síntesis se realizaron con agitación por vía magnética y ultrasónica, buscando mejorar las propiedades estructurales de los catalizadores. Para comprender la estructura cristalina, morfología y porosidad, los materiales se analizaron por difracción de rayos X, microscopía electrónica de barrido, espectroscopia infrarroja, espectroscopía fotoelectrónica de rayos X, espectroscopia de emisión atómica por plasma de microondas, medición de acidez y adsorción de N2. El progreso de la reacción catalítica fue seguido por cromatografía gaseosa y espectroscopía de masa. Dentro de los materiales sintetizados, el que presentó la mayor actividad, fue el obtenido con un 100% de DMF mediante la síntesis con ultrasonido. La conversión fue del 63,57% para el levulinato de metilo y del 38,69% para el levulinato de etilo.

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On the reasons for deactivation of titanate nanotubes with metals catalysts in the acetalization of glycerol with acetone

Cited by 38 publications

References 45 publications

Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion

Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion

Acetalization Catalysts for Synthesis of Valuable Oxygenated Fuel Additives from Glycerol

UiO-66-NH_2 para la obtención de ésteres levulínicos derivados de biomasa

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