活性炭改性对松香歧化用Pd/C催化剂性能的影响

采用沉积-沉淀法制备了4% Pd/C催化剂（Pd质量分数4%），分别以硝酸、盐酸、双氧水和氨水4种溶剂对Pd/C的载体活性炭进行改性，并对载体活性炭的比表面积和孔结构、零电荷点（PZC）以及活性组分Pd的分散度进行了表征，研究了活性炭改性对Pd催化剂在松香歧化反应中催化性能的影响。结果表明：经氨水改性后活性炭比表面积孔径增大且活性炭PZC值升高，有利于活性组分Pd在载体表面的分散，以氨水改性活性炭为载体制备得到的Pd/C催化剂活性最高，在催化剂投料量为0.03%，280℃反应2 h条件下，脱氢枞酸质量分数高达81.7%。

Effect of Activated Carbon Modification on Pd/C Catalyst for Rosin Disproportionation

Pd/C catalyst was prepared by deposition-precipitation method with the mass fraction of Pd 4% and the activated carbon supports were modified with HNO₃,HCl,H₂O₂ and NH₃·H₂O,respectively.The specific surface area,pore structure,point of zero charge(PZC) and metallic dispersion of activated carbon were carried out in order to account for the effects of activated carbon modified with different reagents on catalytic activity of Pd/C catalyst in the rosin disproportionation.The results showed that the surface area and pore diameter of activated carbon modified with NH₃·H₂O increased,and the point of zero charge also enhanced.They were beneficial to well metallic dispersion on the surface of carbon materials.The Pd/C catalyst reached the highest catalytic activity,with the yield of dehydroabietic acid up to 81.7% under the conditions of 0.03% catalyst input at 280℃ for 2 h.