When analyzing the C9 and C10 components in oil phase (Fig. ), it could be observed that the 3-ethyltoluene and 4-ethyltoluene decreased while 3-propyltoluene and 4-propyltoluene increased with increasing the proximity of the two catalytic functions. It could be deduced that with increasing the proximity of these two functions, the C2 and C3 olefins formed on FeMnK could diffuse quickly to the acid sites of Z5 and react with toluene forming C9 and C10 aromatics and reduced the chance of olefins cracking over acid sites, thus the C10 selectivity increased with the proximity. When the proximity was further increased (powder mixing mode), the selectivity of C8+ decreased substantially, while the selectivity of C1-C4 alkanes increased substantially. This was due to the toxic effect of the zeolite acid sites by the ionic migration from the Fe-based catalysts, resulting in a decrease in the surface basicity and carbonation ability of the Fe-based catalysts .