Several experimental and theoretical approaches can help identify the presence of diffusion limitations:
Thiele Modulus: This dimensionless number compares the rate of reaction to the rate of diffusion within the catalyst particle. A high Thiele modulus indicates significant internal diffusion limitations. Weisz-Prater Criterion: Another dimensionless parameter that helps assess the significance of internal diffusion limitations by comparing the observed reaction rate to the diffusion rate. Experimental Techniques: Techniques such as varying particle size, flow rates, and using different catalysts with varying pore structures can provide insights into the extent of diffusion limitations.
