Nitrogen-containing mesoporous carbons (SNMC) were shaped by the drop ball method. A SNMC and a commercial coconut shell carbon (CSC) were oxidized by nitric acid to obtain the OSNMC and OCSC supports. Then, the Pd/OSNMC, Pd/SNMC, Pd/OCSC and Pd/CSC catalysts (5%wt) were prepared to study the effects of carboxyl group on the hydrogenation of C=C double bond. The results showed that both the doped N and surface O-containing functional groups increased the dispersion and surface electron density of supported Pd, leading to the increased heats for the adsorption of hexene and H₂ and thus the increased intrinsic activity for the hydrogenation of hexene on Pd. The pre-adsorption of propionic acid (PA) significantly inhibited the adsorption of hexene and H₂ and decreased the conversion of hexene on Pd. However, the surface O-containing functional groups inhibited the adsorption of carboxyl groups and offset the inhibition effect of carboxyl groups on the hydrogenation of hexene on Pd, while the doped N atoms played the opposite role. Thus, it is expected that the surface O-containing functional groups are beneficial to the hydrogenation of unsaturated fatty acids on Pd/C catalysts.

含氮介孔碳（SNMC）是通过落球法成型的。SNMC 和商业椰壳碳 (CSC) 被硝酸氧化以获得 OSNMC 和 OCSC 载体。然后,制备了Pd/OSNMC、Pd/SNMC、Pd/OCSC和Pd/CSC催化剂(5%wt)以研究羧基对C=C双键加氢的影响。结果表明，掺杂的 N 和表面含 O 官能团都增加了负载 Pd 的分散和表面电子密度，导致吸附己烯和 H _{2 的}热量增加，从而增加了己烯加氢的本征活性。在钯上。丙酸（PA）的预吸附显着抑制了己烯和H ₂的吸附并降低了己烯在 Pd 上的转化率。然而，表面含O官能团抑制了羧基的吸附，抵消了羧基对己烯在Pd上加氢的抑制作用，而掺杂的N原子则起到相反的作用。因此，预期表面含氧官能团有利于不饱和脂肪酸在 Pd/C 催化剂上的氢化。