Catalyst Coke Deactivation & Activity Decay Calculator
Model carbon laydown kinetics via Voorhies power-law ($C_c = A t^n$) and evaluate catalytic activity decay over operating cycle run length.
Coking Kinetics & Operation Time
Coke Buildup & Activity Retention
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Voorhies Carbon Deposition & Catalyst Decay
During hydrocarbon processing (fluid catalytic cracking, catalytic reforming, hydrotreating), heavy polycyclic aromatic hydrocarbons deposit inside catalyst pore networks as carbonaceous coke. This coke physically blocks pore mouths and poisons active acid or metallic sites.
The Voorhies Equation
Alexis Voorhies Jr. discovered that coke buildup is remarkably independent of feedstock flow rate and depends predominantly on on-stream exposure time: $$C_c = A \cdot t^n$$ Where $C_c$ is weight percent carbon and $n \approx 0.5$, demonstrating diffusion-limited carbon fouling.