Ni-Nb_2O_5和Ni-Cu-Nb_2O_5催化甲烷燃烧活性研究

Research on catalytic combustion of methane over Ni-Nb_2O_5 and Ni-Cu-Nb_2O_5 catalysts

在微型固定床反应器中考察了新型甲烷催化燃烧催化剂Ni-Nb2O5和Ni-Cu-Nb2O5的活性.实验结果表明,含Nb2O5的Ni及Ni-Cu双金属催化剂具有好的催化甲烷低温燃烧性能,其甲烷转化率与反应温度、活性组分含量和空速有关.70%Ni担载量的Ni-Nb2O5催化剂可使甲烷在500℃时完全转化,并具有稳定的催化活性.Ni-Cu-Nb2O5体系催化剂中,Ni/Cu比为65/25时催化剂具有最佳的活性;该催化剂中Nb2O5可以在一个比较宽的范围内调节,并在此调节范围内可使甲烷在550℃温度下完全转化.

Catalytic combustion of methane was investigated over Ni-Nb_2O_5 and Ni-Cu-Nb_2O_5 catalysts in a fixed micro-bed reactor. The results show that Ni-Nb_2O_5 and Ni-Cu-Nb_2O_5 catalysts give a high activity for catalytic combustion of methane at low temperature; the conversion of methane depends on reaction temperature, the amount of supported active species and the space velocity. The Ni-Nb_2O_5 catalyst with a Ni content of 70% shows a complete conversion of methane at 500 ℃ and shows a long-term stability. The samples with a Ni/Cu ratio of 65/25 for Ni-Cu-Nb_2O_5 catalysts also show high activity for methane combustion; and the samples give a complete conversion of methane at 550 ℃, as the content of Nb_2O_5 changes in an appropriate range.