CO2 gasification reactivity of biomass char: Catalytic influence of alkali, alkaline earth and transition metal salts

Lahijani, Pooya; Zainal, Zainal Alimuddin; Mohamed, Abdul Rahman; Mohammadi, Maedeh

doi:10.1016/j.biortech.2013.06.059

Cited by 229 publications

(115 citation statements)

References 30 publications

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“…Biomass-derived chars are more reactive than coal chars. This higher reactivity is thought to derive from their porous structure and the presence of inherent catalytic elements such as K that have a strong catalytic effect [15][16][17][18]. When using a highly reactive coke in a blast furnace it is important to bear in mind that lowering the temperature of the thermal reserve zone will decrease the CO/CO 2 ratio and increase the gas utilization ratio.…”

Section: Introductionmentioning

confidence: 99%

Partial briquetting vs direct addition of biomass in coking blends

Montiano

Díaz-Faes

Barriocanal

2014

Fuel

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In this work partial briquetting is employed as a means of biomass densification to allow for biomass inclusion in coking coal blends. The effect of increasing the bulk density was evaluated by comparison with direct addition. Two briquettes of different composition were studied. The influence of the briquettes on the Gieseler plasticity of the coals was determined. It was found that the effect of the binder was not enough to compensate for the decrease in plasticity produced by the inert components of the briquettes. Carbonizations were carried out in a movable wall oven of 17 kg capacity and the quality of the cokes produced was tested by evaluating their mechanical strength, coke reactivity to CO 2 and post-reaction strength. In addition, the porosity and ash chemistry of the cokes was determined and an attempt was made to establish a relation between these results and the quality of the cokes. Coke quality results suggest that 10-15 wt% of briquettes containing biomass can be included in coking blends.

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Section: Introductionmentioning

confidence: 99%

Partial briquetting vs direct addition of biomass in coking blends

Montiano

Díaz-Faes

Barriocanal

2014

Fuel

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“…The shrinking core model (Lahijani et al 2013) or unreacted core model (Ochoa et al 2001;Wang et al 2015) assume that the reaction initially occurs at the external surface of the char and gradually moves inside. During the intermediate conversion of a solid, the core of non-reacted solid shrinks.…”

Section: Kinetic Studies Of the Co-gasification Processmentioning

confidence: 99%

Investigation of Co-Gasification Reactivity of Torrefied Jatropha Seed Cake with Illinois #6 Coal Char

Qin¹,

Zhao²,

Wiltowski³

et al. 2016

BioResources

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Coal and torrefied biomass co-gasification is one of the potential solutions to the reduction of greenhouse gas emissions. For this study, Jatropha seed cake was torrefied at a temperature range of 200 to 300 °C under a nitrogen atmosphere. The torrefied material was then co-pyrolyzed and isothermally co-gasified at 900 °C with two Illinois (IL) #6 coal chars in a fixed-bed reactor connected to an on-line gas chromatography analyzer. Carbon dioxide and carbon monoxide were the primary gas products from the torrefaction process. Kinetic models, such as the shrinking core model, the homogenous model, and the catalysis-controlled model, were used to analyze the gasification mechanism. The results showed that the shrinking core and homogenous models provided the best fits for the gasification reaction data. Jatropha seed cake torrefied at 260 and 280 °C exhibited the best reaction activity with the IL #6 coal chars. The reactivities of coal char with torrefied biomass obtained at 200 and 300 °C were lower in comparison with the others.

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“…The reactivity index Rs has been widely used to compare the gasification reaction reactivity between different samples. It is given by Rs = 0.5/t 0.5 with t 0.5 being the time required for 50% carbon conversion (Lahijani Zainal, Mohamed & Mohammadi, 2013 …”

Section: Experimental Procedures and Reactivity Measurementsmentioning

confidence: 99%

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

H¹

2015

EER

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The isothermal CO 2 gasification characteristics of three chars derived from medium temperature pyrolysis of waste electrical and electronic equipment (WEEE) plastics were studied by using a thermogravimetric analyzer (TGA) within the temperature range of 850−1050°C. Phenolic board (PB), brominated high impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS) plastics are widely used for the electric and electronic equipment and were employed as model WEEE plastics for the char sample production in this study. The effects of their physicochemical properties and gasification temperature on the WEEE plastic chars conversion rate, the reactivity indexes and the gasification rate were investigated in detail. The random pore model (RPM), the extended random pore model (eRPM) and the shifted extended random pore model (s-eRPM) have been employed to fit the CO 2 gasification rate curve of WEEE plastic chars, respectively. The kinetic parameters and the correlation coefficients (R 2 ) were evaluated by RPM, eRPM and s-eRPM, respectively. It was found that the CO 2 gasification reactivity of PB char was the highest, followed by that of HIPS char and the gasification reactivity of ABS char was the lowest, which have a close relationship with their pore and carbon crystal structure properties. In addition, it was found that RMP could fit the gasification reaction rate of HIPS char well whose maximum reaction rate appeared at the char conversion of approximate 0.4. Nevertheless, as for PB char and ABS char, their maximum gasification rate presented at char conversion of around 0.8 and 0.2, respectively. And it was observed that eRMP and s-eRPM could predict their gasification rate of PB char and ABS char very well with higher R 2 , respectively.

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CO2 gasification reactivity of biomass char: Catalytic influence of alkali, alkaline earth and transition metal salts

Cited by 229 publications

References 30 publications

Partial briquetting vs direct addition of biomass in coking blends

Partial briquetting vs direct addition of biomass in coking blends

Investigation of Co-Gasification Reactivity of Torrefied Jatropha Seed Cake with Illinois #6 Coal Char

The CO2 Gasification Kinetic Study of WEEE Plastic Char Derived from Medium Temperature pyrolysis

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