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考察了NiCaO-Al2O3催化剂中添加碱金属、碱土金属、稀土金属氧化物、CuO助剂及CaO含量对催化剂性能的影响。结果表明,10Ni-2K-2Cu15CaO-Al2O3催化剂对CH4、CO2和O2制合成气反应具有较高的催化活性、选择性和较好的抗积炭性能。通过TPR、CO-TPD、XPS和XRD对催化剂进行表征,发现K2O、CuO和CaO的添加削弱了活性组分Ni与载体Al2O3间的相互作用,增加Ni的电子密度,加速了CO与H2的脱附,从而抑制了CH4深度裂解积炭和CO歧化积炭。此外,这些助剂的添加也提高了Ni的分散度,增强了催化剂的抗积炭能力。
The effects of adding alkali metal, alkaline earth metal, rare earth metal oxide, CuO additive and CaO content on the performance of NiCaO-Al2O3 catalyst were investigated. The results show that the 10Ni-2K-2Cu15CaO-Al2O3 catalyst has high catalytic activity, selectivity and good anti-char performance for the reaction of CH4, CO2 and O2 to syngas. The catalysts were characterized by TPR, CO-TPD, XPS and XRD. It was found that the addition of K2O, CuO and CaO weakened the interaction between the active component Ni and the support Al2O3, increased the electron density of Ni and accelerated the removal of CO and H2 Attached, thereby inhibiting the depth of CH4 pyrolysis coke and CO disproportionated carbon. In addition, the addition of these additives also improves the dispersion of Ni and enhances the catalyst’s resistance to carbon deposition.