The assembly of metal containing (Pt and Pd) zeolite Beta nanocrystals in thin films retaining a bi-modal porosity (micropores of 0.73nm and mesopores of 2.3–2.6nm) is presented. The high porosity of metal loaded films was examined by adsorption of probe molecules (water and toluene). Besides, the optical properties of the films including surface roughness (10nm), thickness (200–500nm), and mechanical stability (Young’s modulus of 0.7–1GPa) are determined. The zeolite films are further used for detection of carbon monoxide as a single analyte and in a mixture with methanol at different temperatures; it is found that 70% of the Pt and Pd surfaces remain accessible for the CO, but higher partial pressure of the analytes is needed to reach the saturation level.