Performance of Co/MgO catalyst for CO2 reforming of toluene as a model compound of tar derived from biomass gasification

Bao, Xiuxiu; Kong, Meng; Lu, W. T.; Fei, Jinhua; Zheng, Xiaoming

doi:10.1016/s2095-4956(14)60214-x

Cited by 20 publications

(8 citation statements)

References 21 publications

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“…Thus, the reported results confirm that carbon dioxide acts as a tar reforming agent, enhancing biomass steam gasification and improving biomass conversion to CO and CH 4 …”

Section: Resultssupporting

confidence: 70%

CO₂ biomass fluidized gasification: Thermodynamics and reactivity studies

Bastos

Torres²,

Mazumder

et al. 2018

Can J Chem Eng

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This study reports biomass gasification in a fluidized CREC Riser Simulator. Steam‐CO2 and steam‐inert gas were used as gasifier agents. Three biomass feedstocks were evaluated in terms of gasification performance, based on carbon conversion, product molar fraction, and H2/CO ratios. Results showed that gasification bed temperature influences syngas yields, as well as tar formation. This is the case regardless of the gasifier agent used. It was also shown that steam‐CO2 gasification significantly reduces tar formation while improving carbon conversion and increasing H2 and CO yields. Experimentally‐observed product molar fractions were compared with thermodynamic equilibrium model results. This thermodynamic equilibrium model accounts for biomass elemental composition, bed temperature, and gasifying agents. It was proven that for steam‐CO2 gasification, the thermodynamic equilibrium model predictions are close to the experimental results obtained in the fluidized CREC Riser Simulator. It was also demonstrated that steam‐carbon dioxide gasification leads to a zero CO2 gain, and therefore, a negligible carbon footprint.

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“…Thus, the reported results confirm that carbon dioxide acts as a tar reforming agent, enhancing biomass steam gasification and improving biomass conversion to CO and CH 4 …”

Section: Resultssupporting

confidence: 70%

CO₂ biomass fluidized gasification: Thermodynamics and reactivity studies

Bastos

Torres²,

Mazumder

et al. 2018

Can J Chem Eng

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“…This phenomenon is expected as Ni catalyst commonly undergoes significant deactivation in SRT owing to carbon deposition [38,39], whereas, low catalytic activities or almost no activities are observed for homogenous, AC and 10%Co/ACN. The deactivation behavior of Co catalyst in CO2 reforming of toluene is also reported previously by Bao et al due to the sintering effect of metallic Co particles, which depend on the amount of Co loading amount [40]. However, the addition of Co as a metal promoter in bimetallic supported catalyst has shown good results in SR reactions due to the strong interaction between Ni and Co alloy that enhances the carbon resistant property [37].…”

Section: Catalytic Activity In Steam Reforming Of Toluenesupporting

confidence: 68%

Catalytic Steam Reforming of Toluene for Hydrogen Production over Nickel-Cobalt Supported Activated Carbon

Yahya

Amin²

2019

IJIE

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Global energy supply is almost entirely dependent on fossil fuels such as oil, coal and natural gas [1]. Thus, utilization of non-renewable resources has led to a significant increase of greenhouse gas emission affecting the environment due to climate change. Therefore, reduction of global warming impact has driven the attention towards utilizing renewable source of energy, including biomass [2]. Synthesis gas (syngas), a mixture of primarily carbon monoxide (CO) and hydrogen (H2) has been seen as a promising energy source to replace conventional fossil fuelbased energy. Syngas can also be utilized as an alternative to natural gas fuel for power or H2 production. Compared to fossil fuel, biomass has significant advantages such as abundantly available, inexhaustibility, renewability, carbonneutrality and low sulfur content. The syngas can also be used further as a feedstock for the production of hydrocarbon fuels via the Fischer-Tropsch synthesis (FTS) process. However, biomass-based syngas contains high concentration of tars byproducts, which represent a mixture of several aromatic compounds, that prevents the syngas from direct use and requires an effective tar removal approach. It is essential to remove tar content prior to syngas utilization because the inevitable tars-byproduct causes clogging of lines and heat exchangers as well as catalyst deactivation due to coke formation [3]. Tar formation poses as the greatest hurdles of successful implementation of biomass gasification technologies in a commercial scale. Hence, the removal of tar in biomass gasification is highly desirable. Catalytic steam reforming (SR) of tar is one of the most promising technique because of its high conversion efficiency for hydrogen production [4]. Additionally, catalytic SR of tars is able to increase syngas production where it

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“…In the case of Co/MgO catalyst three different reduction signals are observed with different peak intensities as described in Fig. 2 a. Amongst, the first reduced signal centered at 300 °C is ascribed to the direct transition of Co 3 O 4 into metallic Co species, while second reduced signal about T max 400 °C is illustrated the transformation of strongly support interacted Co 3 O 4 species into CoO and metallic Co. Then, reduction pattern at high temperature (600 °C) may probably represent the formation of some solid solution species such as MgCo 2 O 4 and CoO-MgO species in Co 3 O 4 /MgO catalyst 37 .…”

Section: Resultsmentioning

confidence: 94%

CO2 utilization as a soft oxidant for the synthesis of styrene from ethylbenzene over Co3O4 supported on magnesium aluminate spinel: role of spinel activation temperature

Madduluri

Marella

Hanafiah

et al. 2020

Sci Rep

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Magnesium aluminate spinel (MgAl2O4) supported Co3O4 catalysts are synthesized and tested for the oxidative dehydrogenation (ODH) of ethylbenzene using CO2 as a soft oxidant. The effect of spinel calcination temperature on the catalytic performance has been systematically investigated. With an increase in the activation temperature from 600 to 900 °C, the active presence of a single-phase MgAl2O4 spinel is observed. A catalyst series consisting of MgAl2O4 spinel with varying Co loadings (10–20 wt%) were prepared and systematically distinguished by ICP, XRD, BET, TPR, NH3-TPD, UV–Vis DRS, FT-IR, XPS, SEM, and TEM. Among the tested cobalt catalysts, 15Co/800MA sample derived by calcination of MgAl2O4 support at 800 °C exhibits the most excellent catalytic performance with the maximum ethylbenzene conversion (≥ 82%). Also, high yields of styrene (≥ 81%) could be consistently achieved on the same active catalyst. Further, the catalyst exhibited almost stable activity during 20 h time-on-stream with a slow decrease in the ethylbenzene conversion from 82 to 59%. However, the selectivity of styrene (98%) stayed almost constant during the reaction. Activation of the MgAl2O4 spinel at 800 °C facilitates a dramatic chemical homogeneity for the alignment of Co3O4 nanoparticles on the surface of the active catalyst. Moreover, the isolated Co3O4 clusters have a strong chemical/electronic interaction with the Mg2+ and Al3+ ions on the support perform a crucial role to achieve the maximum catalytic activity.

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Performance of Co/MgO catalyst for CO2 reforming of toluene as a model compound of tar derived from biomass gasification

Cited by 20 publications

References 21 publications

CO₂ biomass fluidized gasification: Thermodynamics and reactivity studies

CO₂ biomass fluidized gasification: Thermodynamics and reactivity studies

Catalytic Steam Reforming of Toluene for Hydrogen Production over Nickel-Cobalt Supported Activated Carbon

CO2 utilization as a soft oxidant for the synthesis of styrene from ethylbenzene over Co3O4 supported on magnesium aluminate spinel: role of spinel activation temperature

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Performance of Co/MgO catalyst for CO2 reforming of toluene as a model compound of tar derived from biomass gasification

Cited by 20 publications

References 21 publications

CO2 biomass fluidized gasification: Thermodynamics and reactivity studies

CO2 biomass fluidized gasification: Thermodynamics and reactivity studies

Catalytic Steam Reforming of Toluene for Hydrogen Production over Nickel-Cobalt Supported Activated Carbon

CO2 utilization as a soft oxidant for the synthesis of styrene from ethylbenzene over Co3O4 supported on magnesium aluminate spinel: role of spinel activation temperature

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Product

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CO₂ biomass fluidized gasification: Thermodynamics and reactivity studies

CO₂ biomass fluidized gasification: Thermodynamics and reactivity studies