Na-W-Mn/SiO_2催化剂表面甲烷脉冲反应 Ⅱ.多组分Na、W、Mn/SiO_2催化剂

Methane Pulse Reaction over Na-W-Mn/SiO_2 Catalysts Ⅱ. Multicomponent Na, W, and Mn SiO_2-Supported Catalysts

制备了多组分 Na、 W、 Mn/ Si O2 催化剂 ,在 ITD(Ion Trap Detector)装置上进行了催化剂表面晶格氧脱附前后的甲烷恒温脉冲反应 (CH4 - CTPR) .研究结果表明 ,Na- W/ Si O2 催化剂表面晶格氧 ,具有较高的 CH4 转化率和 C2 烃选择性 ,并对 C2 H6 的生成起着重要的作用 ;Na- Mn/ Si O2 催化剂表面晶格氧 ,也具有较高的 CH4 转化率和 C2 烃选择性 ,但对 C2 H6 的形成有一定的诱导期 ;W- Mn/ Si O2 催化剂表面晶格氧 ,对 CH4 的转化和 CO2 的生成具有很高初活性 ,但对 C2 烃的选择性较低 ;Na- W- Mn/ Si O2 催化剂表面晶格氧 ,具有很高的 CH4 转化率和C2 烃定向选择性 ,这是由于 Na、W。

Multicomponent Na, W, and Mn SiO 2 Supported catalysts were prepared and their CH 4 constant temperature pulse reaction (CH 4 CTPR) were investigated on an Ion Trap Detector (ITD) apparatus. The experimental results indicate that the surface lattice oxygen of the Na W/SiO 2 catalyst has high CH 4 conversion and selectivity to C 2 hydrocarbons and an important effect to form C 2H 6. The surface lattice oxygen of the Na Mn/SiO 2 catalyst has high CH 4 conversion and selectivity to C 2 hydrocarbons and a time delay to form C 2H 6. The surface lattice oxygen of the W Mn/SiO 2 catalyst has high initial CH 4 conversion and selectivity to CO 2, but has a poor selectivity to C 2 hydrocarbons. The surface lattice oxygen of the Na W Mn/SiO 2 catalyst has very high CH 4 conversion and selectivity to C 2 hydrocarbons. There is a synergic effect of the Na, W, and Mn components to form the surface lattice oxygen in the Na W Mn/SiO 2 catalyst.