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摘要: 以介孔分子筛SBA-15为载体，V和Cr为活性组分，采用浸渍法制备了不同V和Cr质量分数的V-Cr/SBA-15催化剂，研究了其对二氧化碳氧化丙烷制丙烯反应的催化性能，采用XRD、BET、TPR等分析测试技术对催化剂的结构进行了表征。结果表明，催化剂中V组分的质量分数较大时以V2O5物相存在，Cr组分以Cr2O3物相存在，它们对SBA-15分子筛的介孔特征影响不大；V、Cr单组分和双组分催化剂都具有较好的CO2氧化丙烷脱氢制丙烯的催化性能，V和Cr质量分数相同的双组分催化剂比单组分催化剂具有更高的催化活性；在V-Cr/SBA-15催化剂中，V和Cr之间存在一定的相互作用，进而改变了催化剂的氧化还原性能，提高了催化剂的催化性能。
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关键词:
- 丙烷 /
- 脱氢 /
- 丙烯 /
- CO2 /
- V-Cr/SBA-15催化剂
Abstract: A series of V-Cr/SBA-15 catalysts with different V and Cr contents were prepared by the incipient wetness impregnation method. The structure of the catalysts was characterized by XRD, BET and TPR technique. The catalytic activity of the catalysts for the propane oxidative dehydrogenation with CO2 to propene was evaluated using a fixed bed reactor. The results show that vanadium and chromium oxide were well dispersed on the surface of SBA-15 and the structure of the SBA-15 was not destroyed during the impregnation. The catalytic activity of the catalysts depended on the loading of vanadium and chromium. The V and Cr bimetallic catalysts had better performance than those of the single metallic catalysts. The TPR results showed that there was the strong interaction between the vanadium oxide and the chromium oxide in the V-Cr/SBA-15 catalysts. This interaction remarkably changed the redox properties of the catalysts.-
Key words:
- propane /
- dehydrogenation /
- propylene /
- CO2 /
- V-Cr/SBA-15 catalyst
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