Ordered mesoporous carbons (CMK-3) were prepared by structure replication of mesoporous SBA-15 using sucrose as a carbon source. Based on this mesoporous carbon support a series of Cr/CMK-3 catalysts with a Cr loading varying in the range of 1–40wt.% of Cr₂O₃ were prepared by the impregnation method. Both the silica support and the carbon catalysts were characterized by means of low-temperature N₂ sorption, XRD, H₂-TPR, XPS and TGA. The catalytic performance of Cr/CMK-3 catalysts was tested in the dehydrogenation of propane. The conversion of propane increased with raising the chromium content up to 20wt.% of Cr₂O₃. It was also found that the oxidation state of Cr in the studied catalysts slightly depended on the Cr loading. In all fresh samples, amorphous Cr(III) species predominated. However, alpha-Cr₂O₃ and traces of Cr(VI) species were found for the Cr/CMK-3 catalysts samples with a relatively high Cr content.

中文翻译：

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CMK-3碳复制体上负载的氧化铬在脱氢丙烷制丙烯中的催化行为

通过使用蔗糖作为碳源对中孔SBA-15进行结构复制来制备有序中孔碳（CMK-3）。在这种介孔碳载体的基础上，通过浸渍法制备了一系列Cr / CMK-3催化剂，其中Cr的负载量在Cr ₂ O ₃的1-40wt。％范围内变化。二氧化硅载体和碳催化剂均通过低温N ₂吸附，XRD，H ₂ -TPR，XPS和TGA表征。在丙烷脱氢中测试了Cr / CMK-3催化剂的催化性能。丙烷的转化率随着铬含量达到Cr ₂ O _3的20wt。％而增加。还发现所研究的催化剂中Cr的氧化态在一定程度上取决于Cr的负载量。在所有新鲜样品中，非晶态的Cr（III）物种占主导地位。然而，α-铬₂ ö ₃和Cr的痕迹（VI）物种中发现的铬/ CMK-3催化剂样品具有相对高的Cr含量。