Reforming reactions of acetic acid on nickel catalysts over a wide temperature range

Basagiannis, Aristides C.; Verykios, Xenophon E.

doi:10.1016/j.apcata.2006.04.024

Cited by 233 publications

(100 citation statements)

References 38 publications

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“…Furthermore, the diffraction peaks at 2θ of 44.5 • and 51.8 • are attributed to crystal phase of Ni • species (JCPDS PDF# 04-0850) in all reduced and spent catalysts. This is because NiO species are highly disperse on the surface of ATC and strongly interactive with ATC through the synthesis methods of precipitation and impregnation, resulting in the crystal phase of NiO which cannot be detected by XRD in fresh PM-Ni/ATC and IM-Ni/ATC catalysts [25,41]. By comparison, among the XRD spectra of reduced and spent catalysts of these three Ni/ATC catalysts, the intensities of the Ni • peaks are increased in the order of MM-Ni/ATC > PM-Ni/ATC > IM-Ni/ATC.…”

Section: Introductionmentioning

confidence: 99%

“…Secondly, the mesostructure in the three Ni/ATC catalysts, which has been evaluated by N2 adsorption-desorption (Figure 2), provides the reactant accessible For these results, there are several reasons to account for them. First of all, the process of SRAA contained many complex reactions, such as AA thermal decomposition (r1), and SR (r2 and r3) [22,25], which were all endothermic reactions, therefore high temperature was beneficial to these reactions. However, methanation (reverse reaction of r3 and r4) was exothermic reaction, so high temperature had an adverse effect for CH 4 formation [46].…”

Section: Catalytic Performancementioning

confidence: 99%

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Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

et al. 2016

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Abstract:In this research, catalytic steam reforming of acetic acid derived from the aqueous portion of bio-oil for hydrogen production was investigated using different Ni/ATC (Attapulgite Clay) catalysts prepared by precipitation, impregnation and mechanical blending methods. The fresh and reduced catalysts were characterized by XRD, N 2 adsorption-desorption, TEM and temperature program reduction (H 2 -TPR). The comprehensive results demonstrated that the interaction between active metallic Ni and ATC carrier was significantly improved in Ni/ATC catalyst prepared by precipitation method, from which the mean of Ni particle size was the smallest (~13 nm), resulting in the highest metal dispersion (7.5%). The catalytic performance of the catalysts was evaluated by the process of steam reforming of acetic acid in a fixed-bed reactor under atmospheric pressure at two different temperatures: 550 • C and 650 • C. The test results showed the Ni/ATC prepared by way of precipitation method (PM-Ni/ATC) achieved the highest H 2 yield of~82% and a little lower acetic acid conversion efficiency of~85% than that of Ni/ATC prepared by way of impregnation method (IM-Ni/ATC) (~95%). In addition, the deactivation catalysts after reaction for 4 h were analyzed by XRD, TGA-DTG and TEM, which demonstrated the catalyst deactivation was not caused by the amount of carbon deposition, but owed to the significant agglomeration and sintering of Ni particles in the carrier.

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Section: Introductionmentioning

confidence: 99%

Section: Catalytic Performancementioning

confidence: 99%

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

et al. 2016

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“…Haien artean, azido azetikoa da ikertuena, Ni katalizatzaileak erabiliz (La eta Co sustatzaile moduan erabiliz) [13][14][15]. Katalizatzaile mota horrekin beste hainbat konposatu ereduren erreformatzea ikertu da, hala nola, azetonarena eta fenolarena [16], azetolarena (hidroxiazetona) [17], toluenoarena (tar-a simulatuz) [18,19], m-kresolarena, dibenzileterrena, glukosarena, xilosarena eta zukrosarena (tar-a simulatuz) [20].…”

Section: Hidrogeno-ekoizpena Bio-oilaren Erreformatze Katalitikoaren unclassified

Hidrogeno-ekoizpena bio-oilaren erreformatze katalitikoaren bidez

Remiro

Oar‐Arteta

Gayubo³

2017

EKAIA

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Laburpena: H 2 -aren eskariaren igoerak, petrokimikako lehengai eta erregai garbi gisa erabiltzeko, petrolioaz bestelako lehengaiak jatorri duten prozesuen garapena bultzatu du. Prozesu horien artean, biomasak arreta berezia bereganatu du haren erabilgarritasunagatik eta berriztagarritasunagatik. Biomasatik H 2 -a lortzeko zeharkako bideek gero eta jakin-min handiagoa eragin dute, esate baterako, biomasatik eratorritako oxigenatuen bidezko lurrun erreformatzeak. Horien artean, bio-oilak interes handia dauka, beste bideek baino bideragarritasun ekonomiko handiagoa izan baitezake. Izan ere, bio-oilak ekoizpen deslokalizatua izan dezake biomasaren ekoizpen-fokoetan eta ondoren, unitate zentralizatuetara garraia daiteke balioztatzeko. Dena dela, prozesu horretan kontuan hartu beharra dago lignina pirolitikoak sortzen dituen arazoak, zehatzago, erreakzio-ekipoan eta katalizatzailean depositatzen den hondakin solidoa bio-oila lurruntzen denean. Arazo hori gainditzeko, beharrezkoa da teknologia eskalagarria. Horretaz gain, katalizatzaile aktibo, selektibo eta iraunkorren garapena funtsezkoa da prozesu horren bideragarritasuna lortzeko. Lan honetan, bibliografian dauden bio-oilaren erreformatzearen estrategia nagusiak aurkezten dira, ikerketa-taldearen emaitza originalak nabarmenduz.Hitz gakoak: bio-oila, hidrogeno ekoizpena, lurrun erreformatzea, CO 2 -aren harrapaketa, ohantze fluidizatua. Abstract:The growing demand of H 2 for its use as petrochemical raw material and clean fuel has boosted the development of processes for its production from alternative sources to oil, among which biomass has received special attention due to its availability and renewable nature. There is an increasing interest in the development of indirect routes for H 2 production from biomass, via steam reforming of biomass-derived oxygenated compounds. Indirect pathways to obtain hydrogen from biomass, such as the EKAIA 32.indd 35 EKAIA 32.indd 35

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“…Although noble metal catalysts are highly efficient for SRA, their expensive price makes them not suitable for industrial manufacture. Therefore, lower-cost transition metal catalysts have been investigated (Basagiannis and Verykios 2006;Hu and Lu 2010;Wang et al 2012;Zhang et al 2014;Wang et al 2015Wang et al , 2016Pandey and Deo 2016). Among the transition metals, Ni-based catalysts have high-activity in SRA for H2 production.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production from Steam Reforming of Acetic Acid over Ni-Fe/Palygorskite Modified with Cerium

Wang¹,

Chen²,

Yang³

et al. 2017

BioResources

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The steam reforming of acetic acid (SRA) was carried out in a fixed-bed tubular reactor with Ni-Fe/ceria-palygorskite (CPG) catalysts. The asprepared catalysts were analyzed by N2 adsorption-desorption, scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS), H2 temperature programmed reduction (H2-TPR), and X-ray diffraction (XRD). The results of H2-TPR and XRD showed that the addition of CeO2 increased the hydrogen consumption of catalysts and the interaction force between active component (Ni-Fe alloy) and carrier. Moreover, the Ni-Fe alloys were successfully synthesized in the Ni-Fe/CPG catalysts and their crystallite sizes were decreased by adding CeO2. In addition, these catalysts were employed to SRA at 600 °C, GHSV = 14427 h -1 and different molar ratio of S/C. The experimental results revealed that the Ni-Fe/C0.4PG0.6 catalyst can achieve the highest yield of H2 (87%) and HOAc conversion (95%), as well as the highest stability during the process of steam SRA. Additionally, the spent catalysts were characterized by XRD, SEM, and thermogravimetric analysis (TGA). The results showed that the addition of CeO2 enhanced the stability and activity of Ni-Fe/palygorskite catalyst and reduced the coke deposition rate on the catalyst surface.

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Reforming reactions of acetic acid on nickel catalysts over a wide temperature range

Cited by 233 publications

References 38 publications

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

Hydrogen Generation from Catalytic Steam Reforming of Acetic Acid by Ni/Attapulgite Catalysts

Hidrogeno-ekoizpena bio-oilaren erreformatze katalitikoaren bidez

Hydrogen Production from Steam Reforming of Acetic Acid over Ni-Fe/Palygorskite Modified with Cerium

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