不同络合剂改性活性炭的松香歧化用Pd/C催化剂性能

Modification of activated carbon using different complexants and its effect on Pd/C catalyst for disproportionation of rosin

摘要:

采用3种不同络合剂（马来酸、柠檬酸钠、水杨酸钠）对活性炭进行改性，并以未经改性的活性炭为对比，研究了络合剂改性活性炭对Pd/C催化剂的松香歧化性能的影响。傅里叶变换红外（FTIR）、X射线衍射（XRD）、X射线光电子能谱（XPS）及透射电镜（TEM）结果表明，经过马来酸、柠檬酸钠和水杨酸钠修饰改性的活性炭表面存在与Pd具有较强络合能力的配离子，这些配离子成为Pd前驱体的吸附锚定位，有利于形成粒径较小的Pd颗粒，提高了Pd的利用率。以改性后的活性炭为载体，制备得到的Pd/C催化剂活性均明显高于未经处理的活性炭的。

Abstract:

Three complexants, maleic acid, sodium citrate and sodium salicylate, were used to modify the activated carbon, using the activated carbon without modification for comparison. And the effects of the complexants on the performance of Pd/C catalysts used for the disproportionation of rosin were analyzed by FTIR，XRD, XPS, and TEM. The results show that the chelating agents deposited on activated carbon have a strong bonding ability with Pd cation, which is beneficial to form a smaller Pd particle, enhancing the utilization ratio of Pd. So the activity of Pd/C catalyst prepared with the modified activated carbon was significantly higher than that of untreated activated carbon.