SO_2对于铁基硫酸盐的NH_3选择性还原NO催化活性的影响

以硫酸亚铁热解产生的铁基硫酸盐催化剂的选择性催化还原反应活性为对象,研究了300～500℃范围内SO2对于该催化剂催化性能的影响。通过固定床实验,原位红外漫反射测试NH3吸附实验测试了催化剂的脱硝活性、选择性及NH3的吸附情况。实验结果表明:SO2促进了铁基硫酸盐催化剂的选择性催化还原反应活性,提高了NH3的选择性。原位红外光谱实验进一步证实SO2的吸附增强了催化剂表面的Brφnsted酸性位,促进了NH3的吸附,有利于NH3与NO的反应,从而体现出较强的脱硝活性。考虑到脱硝活性以及NH3选择性的情况,选取350℃为主要反应温度比较合适。

Study on the Magnetic Properties of MoFe_3S_4 Single Cubane-like Clusters Containing R_2dtc Ligands

Both cubane-like clusters MoFe_3S_4 (Me_2dtc)_5·2CH_2Cl_2 (1) and MoFe_3S_4(C_4H_8dtc)_5·2EtCN (2) were used to study the temperature-dependent behavior of the molar magnetic susceptibility. A spin coupling model was suggested and the fitting results agree with the model and structural and spectroscopic parameters.