Abstract
The catalytic activity of 12.0 wt% Mo/Al-FSM16 (Si/Al=30) was related to the Mo carbides and carbonaceous carbons during CH 4 conversion at 973 K. The material had been carburized during the temperature-programmed reaction with 20% CH 4 /H 2 at 973 K, with and without purging in He. The temperature-programmed surface reaction and X-ray diffraction analysis showed that the carburized catalysts consisted of Mo carbides (α-Mo 2 C 1-X , β-Mo 2 C, and η-Mo 3 C 2 ) and carbonaceous carbons (pyrolytic and graphitic carbons). The purging treatments of the carburized catalysts at 973 K for 1 or 2 h lowered the activity, due to a decrease in the carbonaceous carbon releases of C 2 H 2 , C 2 H 4 , CO 2 , and H 2 O and due to the Mo carbides changing to other forms. The CH 4 conversion was responsible for η-Mo 3 C 2 conjugation to pyrolytic carbons, which played the role of the intermediate species.
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