Ordered mesoporous carbon (OMC) was sulfonated at different temperature (OMC-SO3H-X, X = 125, 150, 175, 200, and 225 degrees C) in order to provide acid sites to OMC. Palladium catalysts were then supported on OMC-SO3H-X by an incipient wetness impregnation method for use in the catalytic decomposition of 2,3-dihydrobenzofuran to monocyclic compounds. 2,3-Dihydrobenzofuran was used as a lignin model compound for representing β-5 linkage of lignin. In the catalytic decomposition of 2,3-dihydrobenzofuran over Pd/OMC-SO3H-X, ethylcyclohexane and 2-ethlyphenol were mainly produced. Conversion of 2,3-dihydrobenzofuran and total yield for main products (ethylcyclohexane and 2-ethylphenol) were closely related to the acidity of the catalysts. Conversion of 2,3-dihydrobenzofuran and total. yield for main products increased with increasing acidity of Pd/OMC-SO3H-X catalysts. Among the catalysts tested, Pd/OMC-SO3H-150 with the largest acidity showed the highest conversion of 2,3-dihydrobenzofuran and the highest total yield for main products.