蜂窝状Ce/Cr掺杂Cu基催化剂用于乙烷的催化燃烧

以蜂窝堇青石陶瓷为载体,采用浸渍法负载氧化铝涂层和活性组分,制备了蜂窝状Ce/Cr掺杂Cu基催化剂。运用BET,XRD,XPS,H₂-TPR技术对催化剂进行了表征,并对其乙烷催化燃烧活性进行了评价。表征结果显示,Ce/Cr掺杂提高了催化剂表面化学吸附氧的含量,提升了催化剂在较低温度下的氧化还原性能。实验结果表明：在入口乙烷质量浓度2 000 mg/m³、反应空速20 000 h^-1的条件下,Cu-Ce催化剂较Cu催化剂的T₅₀和T₉₀（乙烷转化率为50%和90%时的反应温度）分别降低了46 ℃和101 ℃,降幅高于Cu-Cr催化剂的38 ℃和78 ℃;较高反应空速（30 000 h^-1）对催化反应不利,乙烷浓度对催化剂活性的影响不明显;550 ℃下Cu-Ce催化剂对乙烷的转化率100 h内保持在99%以上,表现出良好的稳定性。

Honeycomb Ce/Cr doped Cu-based catalysts for catalytic combustion of ethane

The honeycomb Ce/Cr doped Cu-based catalyst is prepared by taking honeycomb cordierite ceramic as a carrier and loading an alumina coating and active components by adopting an impregnation method. The catalysts are characterized by BET,XRD,XPS and H₂-TPR,and their catalytic combustion activity for ethane conversion is evaluated. The characterization results demonstrate that the Ce/Cr doping improves the content of oxygen chemically adsorbed on the surface of the catalyst,and improves the redox performance of the catalyst at lower temperature. The experimental results indicate that：Under the conditions of inlet ethane mass concentration 2 000 mg/m³ and space velocity 20 000 h^-1,the temperature for 50% reactant conversion （T₅₀） and for 90% reactant conversion （T₉₀） over Cu-Ce catalyst decrease 46 ℃ and 101 ℃ than those over Cu honeycomb catalyst;The decreasing ranges over Cu-Ce catalyst are higher than those over Cu-Cr catalyst （38 ℃ and 78 ℃）;The relatively higher reaction space velocity （30 000 h^-1） is unfavorable to catalytic reaction,and the influence of ethane concentration on activity of the catalyst is not obvious;The ethane conversion over Cu-Ce catalyst is stable above 99% in 100 h at 550 ℃,showing good application prospects.