Oxidation resistance of Ni/La0.7Sr0.3AlO3−δ catalyst for steam reforming of model aromatic hydrocarbon

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

doi:10.1016/j.ijhydene.2013.04.095

Cited by 18 publications

(10 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.…”

supporting

confidence: 67%

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

et al. 2015

View full text Add to dashboard Cite

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...

show abstract

supporting

confidence: 67%

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

et al. 2015

View full text Add to dashboard Cite

show abstract

“…[19] Many efforts have been focused to improve Ni-based catalyst resistance to coke formation. [20][21][22][23][24] In industrial applications when processing biogas or landfill gas, the feed inevitably contains water vapour in addition to CH 4 and CO 2 . Therefore, simultaneous steam reforming of methane (SRM) and carbon dioxide reforming of methane are more preferable.…”

Section: Introductionmentioning

confidence: 99%

“…[ 19 ] Many efforts have been focused to improve Ni‐based catalyst resistance to coke formation. [ 20–24 ]…”

Section: Introductionmentioning

confidence: 99%

CO₂ conversion through combined steam and CO₂ reforming of methane reactions over Ni and Co catalysts

Shakouri

Lehoux

et al. 2020

Can J Chem Eng

View full text Add to dashboard Cite

Ni-Co bimetallic and Ni or Co monometallic catalysts prepared for CO 2 reforming of methane were tested with the stimulated biogas containing steam, CO 2 , CH 4 , H 2 , and CO. A mix of the prepared CO 2 reforming catalyst and a commercial steam reforming catalyst was used in hopes of maximizing the CO 2 conversion. Both CO 2 reforming and steam reforming of CH 4 occurred over the prepared Ni-Co bimetallic and Ni or Co monometallic catalysts when the feed contained steam. However, CO 2 reforming did not occur on the commercial steam reforming catalyst. There was a critical steam content limit above which the catalyst facilitated no more CO 2 conversion but net CO 2 production for steam reforming and water-gas shift became the dominant reactions in the system. The Ni-Co bimetallic catalyst can convert more than 70% of CO 2 in a biogas feed that contains~33 mol% of CH 4 , 21.5 mol% of CO 2 , 12 mol% of H 2 O, 3.5 mol% of H 2 , and 30 mol% of N 2. The H 2 /CO ratio of the produced syngas was in the range of 1.8-2. X-ray absorption spectroscopy of the spent catalysts revealed that the metallic sites of Ni-Co bimetallic, Ni and Co monometallic catalysts after the steam reforming of methane reaction with equimolar feed (CH 4 :H 2 O:N 2 = 1:1:1) experienced severe oxidation, which led to the catalytic deactivation.

show abstract

“…Furthermore, the Ni particle size on LSAO remained stable before and after the reforming reaction, but the Ni particles on LAO and α-Al2O3 were enlarged and aggregated. Such findings indicate that Ni metal on LSAO has a stable dispersed structure 23) because of the interaction between the LSAO support and the Ni metal particles. Less carbon deposition on Ni/LSAO after steam reforming for all reactants probably resulted from the higher lattice oxygen mobility in perovskite oxide caused by partial displacement of La 3 with Sr 2 which increased the carbon removal activity 17), 18) .…”

Section: Catalyst Performance and Reactivity Formentioning

confidence: 87%

Effect of Hydrocarbon Structure on Steam Reforming over Ni/perovskite Catalyst

Higo

Hashimoto

Mukai

et al. 2015

J. Jpn. Petrol. Inst.

Self Cite

View full text Add to dashboard Cite

Ni/perovskite-type oxide catalyst (Ni/La0.7Sr0.3AlO2.85: LSAO) shows high catalytic activity and low carbon formation during the steam reforming of aromatic hydrocarbons because of the high mobility of lattice oxygen in the support. The reaction mechanisms of the catalyst were investigated by characterizations and catalytic activity tests for steam reforming of various hydrocarbons including toluene, methylcyclohexane, and n-heptane. The catalytic performance was affected by the reactant structure, as revealed by Arrhenius plots and FT-IR analyses. Adsorption state and stability of reaction intermediates were very important factors in the catalytic activity for steam reforming.

show abstract

Oxidation resistance of Ni/La0.7Sr0.3AlO3−δ catalyst for steam reforming of model aromatic hydrocarbon

Cited by 18 publications

References 39 publications

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

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

CO₂ conversion through combined steam and CO₂ reforming of methane reactions over Ni and Co catalysts

Effect of Hydrocarbon Structure on Steam Reforming over Ni/perovskite Catalyst

Contact Info

Product

Resources

About

Oxidation resistance of Ni/La0.7Sr0.3AlO3−δ catalyst for steam reforming of model aromatic hydrocarbon

Cited by 18 publications

References 39 publications

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

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

CO2 conversion through combined steam and CO2 reforming of methane reactions over Ni and Co catalysts

Effect of Hydrocarbon Structure on Steam Reforming over Ni/perovskite Catalyst

Contact Info

Product

Resources

About

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

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

CO₂ conversion through combined steam and CO₂ reforming of methane reactions over Ni and Co catalysts