Due to the importance of developing efficient biomass conversion processes, the mobility of lignin constituents phenol and catechol in zeolite Beta will be studied using QENS. Lignin is one of the most abundant biomass constituents, and accurate simulation of its components in promising catalysts is highly desirable. Experimental mobility data such as diffusion coefficients, activation energies and jump diffusion residence times will form a significant empirical component of interatomic potential parameters being developed from DFT calculations. Changes in molecular structure like the presence of the extra OH group in catechol can significantly impact the interaction of the sorbate with the catalytic active sites. Fundamental studies into the effect of this interaction change on mobility will contribute greatly to the long term study and catalyst development for lignin depolymerisation.