Gasification of woody biomass char with CO2: The catalytic effects of K and Ca species on char gasification reactivity

Mitsuoka, Keiichirou; Hayashi, Shigeya; Amano, Hiroshi; Kayahara, Kenji; Sasaoaka, Eiji; Uddin, Md. Azhar

doi:10.1016/j.fuproc.2010.08.015

Cited by 193 publications

(122 citation statements)

References 13 publications

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“…The CO 2 gasification of char was carried out in a thermo balance (Shimadzu TG-30) described in detail elsewhere [26]. In a typical run, the char (12-14 mg) was heated to 110°C with a heating rate of 10°C/min under 500 mL/min flow of pure nitrogen and kept for 30 min to remove the adsorbed water vapor and then the reactor temperature was increased.…”

Section: Gasificationmentioning

confidence: 99%

The effect of char properties on gasification reactivity

Duman

Uddin

Yanık

2014

Fuel Processing Technology

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104

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In this study, CO 2 gasification of raw and acid-washed chars obtained from various types of lignocellulosic biomasses (woody and agricultural waste biomasses) was studied under isothermal conditions (850°C) using thermal gravimetric analysis. The effect of surface area and alkali/earth alkali metals on the reactivity of the chars was investigated. The different kinetic models were used to fit with the reactivity data by using least square method. The gasification of chars with higher surface area was found to be faster than that of chars having lower surface area. The acid treatment decreased the overall gasification rate for each raw chars. However, although the AI (alkali index) values of chars obtained from agricultural biomasses had equal or higher than that of woody biomass chars, their initial rates were considerably lower. It was concluded that indigenous alkali metals of chars have a remarkable influence of gasification reactivity but an adequate surface area should be provided to react with CO 2 .

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Section: Gasificationmentioning

confidence: 99%

The effect of char properties on gasification reactivity

Duman

Uddin

Yanık

2014

Fuel Processing Technology

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104

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Section: Steam Gasification Ratementioning

confidence: 99%

“…Besides, the main existing form of K in pyrolysis biochar is a water-soluble form, while that of Ca is a NH4Ac-soluble and insoluble form. As Mitsuoka et al [44] suggested, the most significant catalysts for biochar gasification in woody biomass are calcium (Ca) and potassium (K), namely the two main kinds of AAEM. As mentioned above, the role of AAEMs is not only in the solid-phase heterogeneous transformation of biochar, their migration and precipitation characteristics also play a significant role in homogeneous steam reform.…”

Section: Steam Gasification Ratementioning

confidence: 99%

Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species

et al. 2018

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“…Firstly, AAEM may catalyse the destruction of tar through coke formation and subsequent coke gasification/oxidation [17]. Secondly, the concentration of AAEM in char determines the reactivity of char towards oxidation and gasification reactions [18]. Nevertheless, it is also well known that AAEM may also volatilise from the char especially at high temperature [19].…”

Section: Biomass Decompositionmentioning

confidence: 99%

Gasification of Nickel-Preloaded Oil Palm Biomass with Air

Syed‐Hassan¹,

Nor-Azemi²

2016

Bull. Chem. React. Eng. Catal.

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This study experimentally investigates the gasification of nickel-preloaded oil palm biomass as an alternative catalytic approach to produce clean syngas. To eliminate the use of catalyst support, nickel was added directly to the oil palm mesocarp fiber via ion-exchange using an aqueous solution of nickel nitrate. Nickel species was found to disperse very well on the biomass at a nano-scale dispersion. The presence of the finely dispersed nickels on biomass enhanced syngas production and reduced tar content in the producer gas during the air gasification of biomass. It is believed that nickel particles attached on the biomass and its char promote the catalytic cracking of tar on their surface and supply free radicals to the gas phase to enhance the radical-driven gas-phase reactions for the reforming of high molecular weight hydrocarbons. The unconsumed nickel-containing char shows great potential to be re-utilised as a catalyst to further enhance the destruction of tar components in the secondary tar reduction process.

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Gasification of woody biomass char with CO2: The catalytic effects of K and Ca species on char gasification reactivity

Cited by 193 publications

References 13 publications

The effect of char properties on gasification reactivity

The effect of char properties on gasification reactivity

Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species

Gasification of Nickel-Preloaded Oil Palm Biomass with Air

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