Comparison of the group V and VI transition metal carbides for methane dry reforming and thermodynamic prediction of their relative stabilities
Comparison of the group V and VI transition metal carbides for methane dry reforming and thermodynamic prediction of their relative stabilities
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DOI：
10.1023/a:1019062608228
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发表时间：
1999-01-01
影响因子：
2.8
通讯作者：
Green, MLH
中科院分区：
文献类型：
--
作者：
Brungs, AJ;York, APE;Green, MLH
采用CH4 TPR法制备了V族和VI族过渡金属碳化物，并进行了甲烷与二氧化碳在高压下干重整的试验。Mo2C和WC是最稳定的催化剂，而V族金属碳化物的稳定性顺序为：钒>铌>钽。催化剂失活是由于碳化物与CO2氧化，而稳定性与金属氧化物（失活）与CH4反应有关，产生金属碳化物。对该反应的吉布斯自由能进行了计算，得到了与实验结果相似的催化剂稳定性预测趋势。
The group V and VI transition metal carbides have been prepared by CH4 TPR, and tested for the dry reforming of methane with carbon dioxide, at elevated pressure. Mo2C and WC were the most stable catalysts, while the group V metal carbides showed the stability order: vanadium > niobium > tantalum. Catalyst deactivation was due to carbide oxidation with CO2, while stability was associated with the reaction of metal oxide (from deactivation) with CH4, giving the metal carbide. Calculation of the Gibbs free energy for this reaction resulted in a predicted catalyst stability trend similar to that obtained experimentally.