High Temperature Measurement of the Effective Diffusivity through Coke and Graphite by the Wicke-Kallenbach Method

Shigeno, Yoshihito; Kobayashi, Sohei; Omori, Yasuo

doi:10.2355/isijinternational1966.28.697

Cited by 3 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interaction of metallic catalyzers (such as La, Ce and Pr) with coal, coke and graphite materials is based upon the chemical addition of fine powders of metals followed by heating and proceeding the reaction (Wang et al 2016). On the other hand, the diffusion of some elements in the graphite matrix has been investigated and it was revealed that boron (Hennig 1965), argon and helium (SHIGENO et al 1988), uranium (Loch et al 1956), cesium (Carter et al 2015) and iron (Stoneham 1979) diffuse in the coke matrix at elevated temperature, leading to the catalysis of the graphitization reaction. Feng et al (2003) investigated the crystallite structure of several coke samples during CO 2 and air gasification.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of process parameters during graphitization of catalytic coke

Pourabdollah

Zakaria

Najafizadeh

et al. 2019

Int J Coal Sci Technol

View full text Add to dashboard Cite

The aim of this project is studying the effect of thermal operation parameters on the graphitization of selfdiffused ethane-based catalytic coke. The novelty of this study refers to self-diffused metals that had given unique properties to the catalytic coke and had improved the graphitization degree at low temperatures. The main feature of this research is presenting a remarkable energy saving approach that uses low-cost installations for production of graphitized carbon. The experiments were performed in two steps including preparation of self-diffused ethane-based catalytic coke and then low-temperature graphitization of coke samples below 1500°C. Characteristic tests were performed by determination of electrical resistivity and XRD pattern of graphitized samples including graphitization degree, aromaticity, coke rank, number of carbon rings, graphene thickness and length. The results revealed that the blanket atmosphere, final temperature and exposure time had the greatest impact on the aforementioned criteria, while the role of thermal ramp and sulfur content of catalytic coke was negligible. The electrical resistivity tests on the graphitized sample showed how the electrical resistivity of graphitized samples is a function of graphitization degree.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental investigation of process parameters during graphitization of catalytic coke

Pourabdollah

Zakaria

Najafizadeh

et al. 2019

Int J Coal Sci Technol

View full text Add to dashboard Cite

show abstract

“…Wicke and Kallenbach's cell is well-known for diffusivity measurements at room temperature. Shigeno et al modified this cell to perform diffusivity measurement during hematite reduction at different temperatures. , These authors have reported good results, but methods remain expensive and difficult to implement. We propose a simpler experimental device using a tracer gas method.…”

Section: Introductionmentioning

confidence: 99%

Particle in Box: A Cell for in-situ Measurements of Porosity and Effective Diffusion Coefficient during Thermophysical Transformations

Kacem¹,

Salvador²,

Nzihou³

et al. 2007

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The aim of this work is to develop an experimental device for the measurement of porous media textural properties during physical or chemical transformation. The method is based on gas tracer experiments. The system investigated consists of a spherical reactor containing a spherical porous media. To avoid surface stresses, there is no contact between the sample and the reactor. We called the cell a particle in box, or "PIB". The porosity of the solid and the gas effective diffusivity were determined using a parametric identification method. The model is based on the perfectly stirred reactor approach. The PIB methodology was first checked at room temperature to determine the solid porosity and the effective diffusion coefficient. Experiments were then performed during transformation of a sample composed of a mixture of hydroxylapatite particles, glycerol, and water. In situ determination of the porosity and diffusivity from room temperature to 573 K (300°C) was demonstrated.

show abstract

In Situ measurement of effective gas diffusivity through hematite pellets during stepwise reductions

Shigeno

Sakakibara²,

Omori

1990

Metall Trans B

View full text Add to dashboard Cite

High Temperature Measurement of the Effective Diffusivity through Coke and Graphite by the Wicke-Kallenbach Method

Cited by 3 publications

References 3 publications

Experimental investigation of process parameters during graphitization of catalytic coke

Experimental investigation of process parameters during graphitization of catalytic coke

Particle in Box: A Cell for in-situ Measurements of Porosity and Effective Diffusion Coefficient during Thermophysical Transformations

In Situ measurement of effective gas diffusivity through hematite pellets during stepwise reductions

Contact Info

Product

Resources

About