Effect of gas phase alkali species on tar reforming catalyst performance: Initial characterization and method development

Moud, Pouya H.; Andersson, Klas; Lanza, Roberto; Pettersson, Jan B. C.; Engvall, Klas

doi:10.1016/j.fuel.2015.03.027

Cited by 30 publications

(21 citation statements)

References 40 publications

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“…wood, straw), the gasifier technology (fluid bed, entrained flow), and the use of gasifier bed materials or additives (e.g. kaolin, dolomite, olivine) 7 . The syngas cleaning can be done by conventional and hot gas cleaning 8 .…”

Section: Introductionmentioning

confidence: 99%

“…Most of these elements are strong poisons for the Co-based FT catalyst . Several parameters influence the level of inorganic impurities, including the biomass feedstock (e.g., wood and straw), the gasifier technology (fluid bed and entrained flow), and the use of gasifier bed materials or additives (e.g., kaolin, dolomite, and olivine) . The syngas cleaning can be done by conventional or hot gas cleaning .…”

Section: Introductionmentioning

confidence: 99%

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Deactivation of Co-Based Fischer–Tropsch Catalyst by Aerosol Deposition of Potassium Salts

Gavrilović

Brandin

Holmén

et al. 2018

Ind. Eng. Chem. Res.

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A 20%Co/0.5%Re/γAl2O3 Fischer-Tropsch catalyst was poisoned by four potassium salts (KNO3, K2SO4, KCl, K2CO3) using the aerosol deposition technique, depositing up to 3500 ppm K as solid particles. Standard characterization techniques (H2 Chemisorption, BET, TPR) showed no difference between treated samples and their unpoisoned counterpart. The Fischer-Tropsch activity was investigated at industrially relevant conditions (210 °C, H2:CO = 2:1, 20 bar). The catalytic activity was significantly reduced for samples exposed to potassium, and the loss of activity was more severe with higher potassium loadings, regardless of the potassium salt used.A possible dual deactivation effect by potassium and the counter-ion (chloride, sulfate) is observed with the samples poisoned by KCl and K2SO4. The selectivity towards heavier hydrocarbons (C5+) was slightly increased with increasing potassium loading, while the CH4 selectivity was reduced for all the treated samples. The results support the idea that potassium is mobile under FT conditions. The loss of activity was described by simple deactivation models which imply a strong non-selective poisoning by the potassium species.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deactivation of Co-Based Fischer–Tropsch Catalyst by Aerosol Deposition of Potassium Salts

Gavrilović

Brandin

Holmén

et al. 2018

Ind. Eng. Chem. Res.

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“…Gasification tars tend to be refractory, i.e., very unreactive, and are difficult to remove by thermal, or physical processes. Condensed tars can also undergo polymerization to form more complex compounds and can also interact with particulates causing difficulty in particle removal systems [4]. These problems can result in high operational costs and plant shut-down.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of biomass gasification tar model compounds over waste tire pyrolysis char

Al-Rahbi

Williams

2022

Waste Dispos. Sustain. Energy

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Gasification of biomass produces a syngas containing trace amounts of viscous hydrocarbon tar, which causes serious problems in downstream pipelines, valves and processing equipment. This study focuses on the use of tire-derived pyrolysis char for tar conversion using biomass tar model compounds representative of tar. The catalytic decomposition of tar model compounds, including methylnaphthalene, furfural, phenol, and toluene, over tire char was investigated using a fixed bed reactor at a bed temperature of 700 °C and 60 min time on stream. The influence of temperature, reaction time, porous texture, and acidity of the tire char was investigated with the use of methylnaphthalene as the tar model compound. Oxygenated tar model compounds were found to have higher conversion than those containing a single or multi-aromatic ring. The reactivity of tar compounds followed the order of furfural > phenol > toluene > methylnaphthalene. The conversion of the model compounds in the presence of the tire char was much higher than tar thermal cracking. Gas production increased dramatically with the introduction of tire char. The H2 potential for the studied tar model compounds was found to be in the range of 40%–50%. The activity of tire char for naphthalene removal was compared with two commercial activated carbons possessing a very well-developed porous texture. The results suggest that the influence of Brunauer-Emmett-Teller surface area of the carbon on tar cracking is negligible compared with the mineral content in the carbon samples. Graphical abstract

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“…The decrease should not be ascribed to volatilization, since both Ca and Mg are most likely kept as oxides in the sample, especially when the temperature is lower than 1000 • C [50]. Potassium surface concentration is positively correlated with the increase of char conversion with the exception of the low temperature gasification at 700 • C [51], which is at the lower limit of alkali salt vaporization, suggesting K to be highly mobile [50]. At all temperatures, the surface concentration of Na shows no significant change.…”

Section: Original Charmentioning

confidence: 99%

Effects of Porous Structure Development and Ash on the Steam Gasification Reactivity of Biochar Residues from a Commercial Gasifier at Different Temperatures

2020

Self Cite

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The present study aims at investigating the effects of porous structure development and ash content on the observed reactivity during steam gasification of biochar residues from a commercial gasifier. The experiments were conducted at a temperature range of 700 to 800 °C using biochar, derived from entrained flow gasification of biomass, under isothermal conditions using a thermogravimetric analyzer. The pore size distribution, surface area and morphology of char samples were determined by N2 physiosorption and scanning electron microscopy (SEM). The results showed that the gasification temperature does not affect the porous structure development considerably. The total surface area of char exhibits a threefold increase, while the total pore volume increase ranges between 2.0 and 5.3 times, at all temperatures. Both properties are directly proportional to the observed reactivity, especially at conversions up to 70%. Catalytic effects of the mineral matter of the char (mainly potassium) become predominant at the later stages of conversion (conversion greater than 70%).

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Effect of gas phase alkali species on tar reforming catalyst performance: Initial characterization and method development

Cited by 30 publications

References 40 publications

Deactivation of Co-Based Fischer–Tropsch Catalyst by Aerosol Deposition of Potassium Salts

Deactivation of Co-Based Fischer–Tropsch Catalyst by Aerosol Deposition of Potassium Salts

Decomposition of biomass gasification tar model compounds over waste tire pyrolysis char

Effects of Porous Structure Development and Ash on the Steam Gasification Reactivity of Biochar Residues from a Commercial Gasifier at Different Temperatures

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