Mechanisms of Glycerol Dehydration

Nimlos, Mark R.; Blanksby, Stephen J.; Qian, Xianghong; Himmel, Michael E.; Johnson, David K.

doi:10.1021/jp060597q

Cited by 257 publications

(249 citation statements)

References 29 publications

Supporting

Mentioning

217

Contrasting

Unclassified

Order By: Relevance

“…For the aldehyde to be present in the system in significant quantities to produce 1,3-dioxan-5-ol, the 1,3-dehydration of glycerol must occur [70]. Likewise acrolein was produced in high yields over this catalyst.…”

Section: Insights Into the Reaction Mechanism For Allyl Alcohol Formamentioning

confidence: 99%

Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Sánchez

Dlugogorski

Kennedy

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Alkaline preparation conditions engendered the zeolite with mesoporosity;Rubidium deposition enhanced allyl alcohol yield and decreased acrolein yield;Alkali post synthesis modification reduced the concentration of acid sites. AbstractUnder most reaction conditions studied, acrolein is reported as the primary product in the conversion of glycerol over zeolites. In such processes, acrolein forms at relatively high yields, with negligible allyl alcohol selectivity. In this contribution, we report the development of ZSM5-supported iron catalysts, modified by rubidium deposition, as stable materials for production of allyl alcohol from glycerol. Our results demonstrate a reduced rate of formation of acrolein over modified catalysts. Both unmodified and modified catalysts were analysed by inductively coupled plasma optical emission spectrometry, nitrogen adsorption, scanning electron microscope, X-ray diffraction, ammonia temperature programmed desorption, X-ray photoelectron spectroscopy and ultraviolet-visible spectroscopy. These techniques revealed that differences in product distribution and catalyst performance are due to the combined effects of iron loading, catalyst acidity and changes in the porosity of the catalyst.2

show abstract

Section: Insights Into the Reaction Mechanism For Allyl Alcohol Formamentioning

confidence: 99%

Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Sánchez

Dlugogorski

Kennedy

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

show abstract

“…Even though there have been significant advances in the development of low-cost heterogeneous catalysts and raw materials [2][3][4], as well as processes of separation and purification of reaction [27].…”

Section: Introductionmentioning

confidence: 99%

“…The reaction pathways obtained from their calculations were essentially the same as those of Intermediary compounds in glycerol dehydration: (a) 1,3-dihydroxypropene; (b) 2,3-dihydroxypropene; (c) vinyl alcohol and; (d) 3-hydroxypropanal (keto-isomer of 1,3-DHP) according to [27].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Catalytic Dehydration of Glycerol to Acrolein over a Catalyst of Pd/LaY Zeolite and Comparison with the Chemical Equilibrium

et al. 2017

View full text Add to dashboard Cite

Glycerol dehydration to acrolein was studied with three catalysts using zeolite-Y. This zeolite in its protonic form (HY), with La (LaY) and Pd with La (Pd/LaY), was characterized by X-ray diffraction (XRD), Fourier-transform-infrared spectroscopy (FTIR) with pyridine, BET, Scanning Electron Microscope (SEM)-Energy-Dispersive Spectroscopy X-ray (EDS) and the catalytic activity tests were carried out under H 2 atmosphere. It was found that La ions exchanged in the zeolite-Y resulted in the improvement of both glycerol conversion and yield to acrolein, also a relatively constant glycerol conversion was achieved up to three hours, due to the presence of Pd on the catalyst and H 2 in the feed. The comparison of the calculated and experimental yields obtained from the catalytic tests of the Pd/LaY catalyst indicates a greater activity for the reaction to acrolein than for the reaction to acetol. The calculated equilibrium yields of the dehydration reaction from glycerol to acrolein, acetol, ethanal, methanol, and water and the experimental yields of a Pd/LaY catalyst were compared. Thermodynamically, a complete conversion of glycerol can be achieved since the general system remains exothermic and promotes the path to acetol below 480 K. Above this temperature the system consumes energy and favors the production of acrolein, reaching its maximum concentration at 600 K.

show abstract

“…Além da maior formação de líquidos, foi observada também uma alta pressão no reator, devido à formação de carbono e, conseqüente, desativação do catalisador a baixa temperatura. Esse carbono pode ser relacionado à formação de eteno (que é considerado um precursor na formação de carbono -Reação 22) pela desidratação do glicerol (BUFFONI et al, 2009;ZHANG et al,2007;HARYANTO, 2007 NIMLOS et al,2006). Seletividade (mol prod/mol conv) Através destes valores observa-se uma diminuição do parâmetro de rede, para os catalisadores preparados por polimerização em única etapa, quando comparados ao suporte puro e com os catalisadores impregnados.…”

Section: Xanes-rtp H 2 -Borda K De Niunclassified

Desenvolvimento de catalisadores de Ni/CeO2-ZrO2 com adição de promotores para produção de hidrogênio e/ou gás de síntese a partir da reação de reforma a vapor de álcoois

Maia¹

View full text Add to dashboard Cite

AGRADECIMENTOSAcredito que sem Deus, sem família e sem pessoas amigas, nenhum trabalho é possível, por isso tenho muito que agradecer: ICP -Madri: Juanma, Rosa, Cristina, a doce Gema, Gofuen, Bárbara, Noelia Alf, Inma, Maria José, Ana Carolina, Maria José (La Wapi!), Silvia, Patri, Maricarmém, Javi, Fran, Aldossari, Beatriz Poceiro, Beatriz Arredondo, Paco CO(g) + 3H2(g) ↔ CH4(g) + H2O(g) Reação 13 ABSTRACTThe growing interest for alternative energy sources has stimulated the interest in the use of hydrogen and syngas obtained from renewable sources. Among these sources, the use of ethanol produced in Brazil from sugar cane and with a supply network already developed, and glycerol obtained as a byproduct in the biodiesel production have been highlighted in the last years.Hydrogen and syngas can be produced from steam reforming of ethanol and glycerol reactions (SRE and SRG), leading to a growing interest in the development of efficient catalysts for the production of H 2 and syngas from these alcohols.In the present thesis, catalysts of nickel supported on Ce x Zr 1-x O 2 solid solution were studied, with the goal of evaluating the performance of those in the SRE and SRG reactions.The supports were prepared by Pechini method and the catalysts were synthesized by impregnation and polymerization method in one step, with nickel loads of 5 wt.%, 10 wt.% and 15 wt.%. On the catalyst with better catalytic performance, it was impregnated 1wt% of Rh, Ru, Pt or Au as promoter.Supports and catalysts were characterized by X-ray diffraction (XRD), Raman spectroscopy, temperature-programmed reduction (TPR), oxygen storage capacity (OSC), N 2 physisorption (B.E.T. method), Diffuse Reflectance Infrared Spectroscopy with CO (DRIFTS -CO), X-ray absorption near edge structure (XANES -TPR H 2 ), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX) and Scanning electron microscopy (SEM).The catalytic tests of SRG were performed at 600 and 700 o C and for SRE at the tests were carried out at 400, 500 and 600 o C. The feed of water:alcohol was in the molar ratio of 3:1. DRIFTS coupled to a mass spectrometer analyzes was also carried out to identify the intermediates formed during the SRE. From the catalytic tests it was possible to observe that the support composition, metal load and preparation method influenced the selectivity to gaseous products, probably due to structural changes caused, mainly in the dispersion of the active phase on the support. Also, it was observed that the addition of noble metals favored a lower carbon deposition on the catalysts.

show abstract

Mechanisms of Glycerol Dehydration

Cited by 257 publications

References 29 publications

Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol

Catalytic Dehydration of Glycerol to Acrolein over a Catalyst of Pd/LaY Zeolite and Comparison with the Chemical Equilibrium

Desenvolvimento de catalisadores de Ni/CeO2-ZrO2 com adição de promotores para produção de hidrogênio e/ou gás de síntese a partir da reação de reforma a vapor de álcoois

Contact Info

Product

Resources

About