Structure and activity of Ni/La0.7Sr0.3AlO3−δ catalyst for hydrogen production by steam reforming of toluene

Mukai, Daiki; Tochiya, Satoshi; Murai, Yuki; Imori, Masaya; Sugiura, Yukihiro; Sekine, Yasushi

doi:10.1016/j.apcata.2013.05.023

Cited by 32 publications

(14 citation statements)

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“…Similarly, Devi et al also reported activation energy of 187 kJ/mol for naphthalene reforming on pretreated olivine. Compared to these two literatures, the activation energy value derived from the present work is lower possibly because LSNFO catalyst contains lattice oxygen which can enhance the reaction as reported in literature while natural olivine is comprised mainly of (Mg 0.94 Fe 0.06 )SiO 4 which does not contain lattice oxygen. However, those literatures do not provide the detail mechanism and the RDS which are of great importance for better catalyst design.…”

Section: Resultscontrasting

confidence: 50%

“…Aznar et al reported an apparent activation energy of 58 kJ/mol for tar reforming on commercial nickel catalyst. Mukai et al reported that the apparent activation energies for steam reforming of toluene are different for low temperature region and high temperature region. At low temperature region, they proposed water activation as the RDS with activation energy of 113 kJ/mol, whereas at high temperature, the RDS was proposed to be toluene decomposition with a lower activation energy of 36 kJ/mol due to the enhancement from lattice oxygen of the catalyst support.…”

Section: Resultsmentioning

confidence: 99%

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Mechanism and kinetic modeling for steam reforming of toluene on La_0.8Sr_0.2Ni_0.8Fe_0.2O₃ catalyst

Oemar

Hidajat

et al. 2014

AIChE Journal

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Reaction mechanism for steam reforming of toluene is proposed for La0.8Sr0.2Ni0.8Fe0.2O3 perovskite catalyst. The proposed mechanism was derived from various characterization results such as temperature‐programmed desorption (TPD) and temperature‐programmed surface reaction (TPSR) water, TPSR toluene, TPD O2 and in situ DRIFT of toluene decomposition, and steam reforming of toluene. Five kinetic models were developed based on the proposed dual‐site reaction mechanism using Langmuir–Hinshelwood approach. Subsequently, the parameters of the kinetic models were estimated by nonlinear least square regression. A good agreement was obtained between experimental and model predicted results for the rate determining step based on reaction between adsorbed aldehyde and adsorbed oxygen. The adsorbed aldehyde species is produced from the reaction between adsorbed C2H2 or CH2 and adsorbed oxygen while the adsorbed oxygen species can come from the oxygen from water activation, lattice oxygen species, and/or the redox property of some metals such as Fe. This shows that the adsorbed oxygen species plays important role in this reaction. © 2014 American Institute of Chemical Engineers AIChE J 60: 4190–4198, 2014

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Section: Resultscontrasting

confidence: 50%

Section: Resultsmentioning

confidence: 99%

Mechanism and kinetic modeling for steam reforming of toluene on La_0.8Sr_0.2Ni_0.8Fe_0.2O₃ catalyst

Oemar

Hidajat

et al. 2014

AIChE Journal

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“…Sekine et al also reported that the Sr doping in the Ni/ La 0.7 Sr 0.3 AlO d catalyst helps to improve the catalytic activity and reduce carbon formation due to lattice oxygen of the catalyst. [46][47][48][49] The similar conclusion of the Sr role on the enhancement of catalytic performance was reported in dry CO 2 reforming of methane (DRM) reaction. 20,22,50 Considering the important role of Sr at low steam amount in steam reforming of biomass tar, the catalyst development should be designed by depositing more Sr on the catalyst surface.…”

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Enhancing performance of Ni/La₂O₃ catalyst by Sr-modification for steam reforming of toluene as model compound of biomass tar

et al. 2015

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Steam reforming of biomass tar with toluene as the model compound was studied using Sr-doped Ni/La 2 O 3 catalysts prepared using two methods, i.e. co-impregnation of Sr and Ni on La 2 O 3 support (Ni-Sr/La 2 O 3 catalyst) and sequential impregnation of Sr on Ni/La 2 O 3 catalyst (SNL catalyst), which were then calcined at various temperatures (500, 700, and 900 C). These two types of catalysts are found to possess better catalytic performance than the undoped Ni/La 2 O 3 catalyst at the same calcination temperature due to the presence of Sr, which helps in water adsorption at low steam/carbon (S/C) ratio. Moreover, the catalytic performance for catalysts calcined at various temperatures decreases following this trend: 500 C > 700 C > 900 C due to lower BET surface area and lower surface active metal available for reaction. In addition, it is also observed that the Sr/Ni/La 2 O 3 catalyst has better performance than the Ni-Sr/La 2 O 3 catalyst at the same calcination temperature. Further characterization results suggest that in the Ni-Sr/La 2 O 3 catalyst, the Sr is present between Ni and La 2 O 3 support. On the other hand, Sr in the Sr/Ni/La 2 O 3 catalyst is thought to be located on the surface of Ni/La 2 O 3 due to the preparation method. This study shows that more Sr on the catalyst surface has better catalytic activity and stability in steam reforming of toluene. IntroductionThe need for a renewable alternative of energy sources is increasingly urgent due to the rapid depletion of fossil fuel reserves and the costly price tag of crude oil. The utilization of biomass has been receiving more attention as an abundant and cheap source of renewable energy. Among them, biomass gasication has garnered considerable attention for hydrogen/ synthesis gas production, which can then be used for Fischer Tropsch processes, syntheses of methanol and electricity production in the case of a fuel cell. [1][2][3][4] The main challenge in biomass gasication technology is the removal of tar, which is a mixture of various condensable hydrocarbon compounds containing toluene as the major component, followed by naphthalene. 3 Furthermore, tar can polymerize to form more complex structures and aerosols. Tar can condense on particulate lters, heat exchangers, and engines, resulting in plugging and attrition. This further causes a decrease in efficiency of the process operations and an increase in maintenance and operating costs. Tar removal methods can be classied as primary or secondary. Primary methods include all measures taken in the gasication reactor to prevent tar from being formed in the gasier or to convert it.In secondary methods, pretreatment, either chemical or physical, is performed downstream of the gasier. Both primary and secondary methods require the use of a catalyst.Various metal catalysts have been investigated, such as Ni 5-12 Co, [13][14][15][16][9][10][11][12][16][17][18] and noble metal 19 for the steam reforming of biomass tar using toluene as the model compound. Among those metal catalysts, Ni cataly...

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“…15,20,23,24 Results have shown that the lattice oxygen reacts with various hydrocarbons to form partially oxidized hydrocarbon species (C x H y O z : oxygenated species) on Sr-substituted LaAlO 3 . [25][26][27] Oxygenated species reacted with H 2 O as reductants to form H 2 . Then the lattice oxygen consumed is restored by H 2 O in atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

et al. 2019

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Structure and activity of Ni/La0.7Sr0.3AlO3−δ catalyst for hydrogen production by steam reforming of toluene

Cited by 32 publications

References 25 publications

Mechanism and kinetic modeling for steam reforming of toluene on La_0.8Sr_0.2Ni_0.8Fe_0.2O₃ catalyst

Mechanism and kinetic modeling for steam reforming of toluene on La_0.8Sr_0.2Ni_0.8Fe_0.2O₃ catalyst

Enhancing performance of Ni/La₂O₃ catalyst by Sr-modification for steam reforming of toluene as model compound of biomass tar

Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

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Structure and activity of Ni/La0.7Sr0.3AlO3−δ catalyst for hydrogen production by steam reforming of toluene

Cited by 32 publications

References 25 publications

Mechanism and kinetic modeling for steam reforming of toluene on La0.8Sr0.2Ni0.8Fe0.2O3 catalyst

Mechanism and kinetic modeling for steam reforming of toluene on La0.8Sr0.2Ni0.8Fe0.2O3 catalyst

Enhancing performance of Ni/La2O3 catalyst by Sr-modification for steam reforming of toluene as model compound of biomass tar

Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

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Mechanism and kinetic modeling for steam reforming of toluene on La_0.8Sr_0.2Ni_0.8Fe_0.2O₃ catalyst

Mechanism and kinetic modeling for steam reforming of toluene on La_0.8Sr_0.2Ni_0.8Fe_0.2O₃ catalyst

Enhancing performance of Ni/La₂O₃ catalyst by Sr-modification for steam reforming of toluene as model compound of biomass tar