Through systematical experiments, a comparative study was conducted concerning several graphene-supported noble metal catalysts for dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NEC). It was found that the catalytic activity of the prepared graphene-supported noble metal catalysts was following the order of Pd > Pt > Rh > Ru > Au for the dehydrogenation process. Pd supported on reduced graphene oxide (rGO) prepared by one-pot in situ synthesis has much more excellent catalytic performance than other kinds of catalysts investigated for comparison, simultaneously the using amount of noble metals can obviously be decreased. To be specific, at 453 K, the final dehydrogenation product catalyzed by the novel catalyst of Pd/rGO is N-ethylcarbazole (NEC) and the process selectivity was increased from 44.77% (commercial Pd/Al₂O₃) to 97.65%, as well as the dehydrogenation ratio reached 99.14%. In addition, the novel catalyst is also superior to other reported catalysts in terms of dehydrogenation performance of 12H-NEC. Its dehydrogenation activity at 443 and 433 K of Pd/rGO was tested and the catalytic performance keeps stable at the two temperatures. Based on the experimental data, kinetic calculation was carried out and some fundamental parameters regarding reaction kinetics was obtained.

通过系统实验，对几种石墨烯负载的贵金属催化剂进行十二氢-N-乙基咔唑（12H-NEC）脱氢的比较研究。发现所制备的石墨烯负载的贵金属催化剂的催化活性在脱氢过程中遵循Pd＞ Pt＞ Rh＞ Ru＞ Au的顺序。通过一锅法原位合成制备的还原型氧化石墨烯（rGO）上负载的Pd催化剂具有优于其他同类比较催化剂的优异催化性能，同时可以明显减少贵金属的使用量。具体而言，在453 K下，新型Pd / rGO催化剂催化的最终脱氢产物为N-乙基咔唑（NEC），工艺选择性从44.77％（商业Pd / Al₂ O ₃）达到97.65％，以及脱氢率达到99.14％。另外，就12H-NEC的脱氢性能而言，该新型催化剂也优于其他报道的催化剂。测试了其在Pd / rGO的443和433 K下的脱氢活性，并且在两个温度下催化性能均保持稳定。根据实验数据，进行了动力学计算，得到了一些有关反应动力学的基本参数。