Strength of coke

Figure 2, Relation between Gieseler max, fluidity of blends and drum strength of coke yielded in Fukuyama Works,...

Figure 3. Relation between MF of coal blends and strength of coke made by small test oven.

Residual Oil Addition Test. As previously shown in Figures 2 and 3, the effect of the reflectance and the fluidity of blended coals on the strength of coke that is produced can be expressed in the form of a model as in Figure 5. (3J Using the test oven, the low-volatile coal in the base blends was replaced by the other coals with different coal ranks in the coal rank control region, and the relationship between DI of the coke produced and Ro of the replacement coal was determined. The regression line is illustrated in Figure 6. 

Table 7 Standard tests for assessing mechanical strength of coke ...

S. Mrozowski. Mechanical strength, thermal expansion and structure of cokes and carbons. Proc. 1st and 2nd Conf on Carbon., Waverley Press, Baltimore, MD,... 

Early workers viewed carriers or catalyst supports as inert substances that provided a means of spreading out an expensive material like platinum or else improved the mechanical strength of an inherently weak material. The primary factors in the early selection of catalyst supports were their physical properties and their cheapness hence pumice, ground brick, charcoal, coke, and similar substances were used. No attention was paid to the possible influence of the support on catalyst behavior differences in behavior were attributed to variations in the distribution of the catalyst itself. 

In the case of alkenes, 1-pentene reactions were studied over a catalyst with FAU framework (Si/Al2 = 5, ultrastable Y zeoHte in H-form USHY) in order to establish the relation between acid strength and selectivity [25]. Both fresh and selectively poisoned catalysts were used for the reactivity studies and later characterized by ammonia temperature programmed desorption (TPD). It was determined that for alkene reactions, cracking and hydride transfer required the strongest acidity. Skeletal isomerization required moderate acidity, whereas double-bond isomerization required weak acidity. Also an apparent correlation was established between the molecular weight of the hard coke and the strength of the acid sites that led to coking. 

Maceral behaviour and interaction on carbonization Mesophase development during carbonization Relation of coke strength (stability) to coke texture, pore size distribution, pore wall thickness... 

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