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在CH4、CO2 和O2 制合成气反应中 ,通过添加过渡金属氧化物 (助剂 ) ,改善了Ni/CaO -Al2 O3催化剂的性能。结果表明 ,添加助剂提高了催化剂的低温活性 ,但高温活性只有添加CuO时才有所提高。试验还测得催化剂的抗积炭顺序 :Ni-CuO/CaO -Al2 O3>Ni-MnO2 /CaO -Al2 O3>Ni-Cr2 O3/CaO -Al2 O3>Ni-V2 O5 /CaO -Al2 O3>Ni/CaO-Al2 O3。采用晶格氧活动性、TPR、XPS方法发现 ,助剂的添加提高了Ni的电子云密度 ,减弱了CH4深度裂解的可能性 ;提高晶格氧的活动性 ,使在催化剂表面上的积炭能被及时气化 ,防止了碳物种的积累
In CH4, CO2 and O2 syngas reaction, the performance of Ni / CaO-Al2O3 catalyst was improved by adding transition metal oxides (auxiliaries). The results showed that adding additives increased the low temperature activity of the catalyst, but the high temperature activity only increased when adding CuO. The experiment also measured the order of the anti-carbon deposition of the catalyst: Ni-CuO / CaO-Al2 O3> Ni-MnO2 / CaO -Al2 O3> Ni-Cr2 O3 / CaO -Al2 O3> Ni-V2 O5 / CaO -Al2 O3> Ni / CaO-Al2 O3. Adopting lattice oxygen activity, TPR and XPS methods, it was found that the addition of additives increased the electron cloud density of Ni and reduced the possibility of deep cracking of CH4; the activity of lattice oxygen was increased and carbon deposition on the catalyst surface Can be timely gasification, preventing the accumulation of carbon species