NiO-Al_2O_3催化剂重整反应中的阈值效应

Effect of threshold value of NiO/γ － Al_2O_3 catalyst in the reforming reaction

应用ＸＲＤ、ＴＰＲ和催化活性评价手段，考察了ＣＨ_４与ＣＯ_２重整制合成气的负载型Ｎｉ催化剂的阈值效应．实验结果表明，在反应温度为７５０℃和空速为２ ５００ ｈ^（－１），ＮｉＯ载量为１４．０％ＮｉＯ／γ－Ａｌ_２_Ｏ３（相当于０．１６３ ｇ ＮｉＯ／ｇγｙ－Ａｌ_２Ｏ_３或０．０７７ ｇ ＮｉＯ／１００ｍ~２γ－Ａｌ_２Ｏ_３）催化剂具有最佳的催化性能，ＮｉＯ在γ－Ａｌ_２Ｏ_３表面上分散阈值为０．２３８ ｇ ＮｉＯ／ｇγ－Ａｌ_２Ｏ_３（相当于０．１１２ ｇ ＮｉＯ／１００ｍ~２γ－Ａｌ_２Ｏ_３），能明显体现负载型Ｎｉ催化剂在重整反应中的阈值效应．

Using XRD,TPR and catalytic performance evaluation, the effect of threshold value of supported nickel catalysts for CO_2 -re- forming of CH_4 to syngas was studied. The experiments results showed that the most optimal NiO content of supported - Ni catalysts was abet 14. 0% (equivalent to 0. 163 g NiO/g γ - Al_2O-3 or 0.077 NiO/100m^2 γ- Al_2O_3 )when reaction temperatare was 750℃ and space velocity was 2500h-1, the dispersion threshold value of NiO on the γ - Al_2O_3 sulface was 0. 238 g NiO/g γ－Al_2O_3 (equivalent to 0. 112g NiO/100m^2γ- Al_2O_3 ). It code elnhay objedvely the effect of theshold value of supported -Ni catalysts in the reforming reaction.