COKE CHARACTERIZATION

Coke Characterization by Temperature-Programmed Oxidation of Spent FCC Catalysts That Process Heavy Feedstock... 

Pt-Re Sulfided and chlorided, A1203 support Coking allowed, and coke characterized by temp-programmed oxidation. Also catalyst testing. 

The reaction was carried out in a glass fixed bed gas phase reactor at 698K and 1 atm. The reaction products were analyzed by gas chromatography using an HP PONA column for the liquid phase and an AI2O3/KCL PLOT column for the gas phase. For those runs aiming at coke characterization, WHSV was adjusted to allow a significant coke formation at isoconversion. 

Coke Characterization.- The spectroscopy of coke is generally studied by passing ethylene or multi-ring compounds over the sample surface. Analogous techniques are often used in the reactors described in Section 1 to accelerate the coking rate. 

In the last decade, there has been an increase in the research effort in this field. Coke characterization has been included in many papers where deactivation is a major issue. Several characterization techniques have been used to study coke deposits and to obtain information regarding reaction mechanism, deactivation mechanism, and regeneration conditions. One of the most widely used techniques is temperature-programmed oxidation. Because of its simplicity and utility, this technique has been widely accepted and used in the characterization of coke in a large variety of catalytic systems. 

It is not the intention to fully review all the literature regarding coke characterization, but to present selected examples of application of different techniques in... 

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