甲烷二氧化碳重整制合成气镍-钴双金属催化剂

Reforming of Methane with Carbon Dioxide to Syngas over Ni-Co Bimetallic Catalysts

采用微反 -色谱、TPO、TPR和 CO2 -TPD等技术研究了负载型 Ni/Si O2 、Co/Si O2 和 Ni-Co/Si O2 催化剂对甲烷二氧化碳重整反应的催化活性、抗积炭性能 ,并对其还原性能和表面吸附性能进行了表征 .发现与单金属催化剂相比 ,Ni-Co/Si O2 双金属催化剂有优越的催化活性和抗积炭性能 .催化剂表征结果表明 ,在Ni-Co/Si O2 催化剂中 Ni促进了 Co的还原 ,Co提高了催化剂对 CO2 的吸附能力 ,抑制了低活性积炭物种的生成 .

Reforming of CH 4 with CO 2 to give syngas over Ni/SiO 2, Co/SiO 2 and Ni Co/SiO 2 catalysts has been studied by activity evaluation using TPO, TPR and CO 2 TPD techniques. It is found that the catalysts without pre reduction decreased in their activities following the order of Ni Co/SiO 2~Ni/SiO 2Co/SiO 2, and Ni Co/SiO 2 was much less sensitive to coking and more stable than Ni/SiO 2 catalyst. The CH 4 conversion over Ni Co/SiO 2 catalyst increased with time in stream during the first 1 h period of reaction and then remained invariable with time in stream for 9 h, while over Ni/SiO 2 catalyst the CH 4 conversion decreased continuously with reaction time and the reaction had to be stopped because of the reactor becoming completely plugged by carbon deposits after 6 h. In the case of Ni Co/SiO 2 catalyst, Ni promoted the reduction of Co species, which was found beneficial to CO 2 adsorption and suppression of less active carbon deposition. This is considered to be related to the excellent activity, stability and anti coking property of the bimetallic catalyst.