Jung, H. Jung, K.-D. Joo, O.-S. Kim, S.J. 2024-01-12T07:55:53Z 2024-01-12T07:55:53Z 2022-03-07 2006-09 1012-0394 https://pubs.kist.re.kr/handle/201004/81567 Niobium- and tantalum-containing mesoporous molecular sieves MCM-41 have been synthesized, and applied as a catalyst for vapor phase Beckmann rearrangement of cyclohexanone oxime to e-caprolactam. NbMCM-41 catalyst exhibited high catalytic performance in the vapor phase Beckmann rearrangement of cyclohexanone oxime. The oxime conversions were almost 100% and the lactam selectivities were around 80%. The lactam selectivities of NbMCM-41 catalyst were higher than those of AlMCM-41 catalyst. However, TaMCM-41 catalyst exhibited lower catalytic performance than AlMCM-41 catalyst, and it was fast deactivated with time. These results may be due to the acidity difference among the catalysts. The results from NH3-TPD showed that NbMCM-41 catalyst possessed weak and medium acid sites, while TaMCM-41 catalyst possessed only very weak acid sites. AlMCM-41 catalyst also exhibited only weak acid sites. English IUMRS Synthesis and catalytic application of mesoporous molecular sieves MCM-41 containing niobium and tantalum Conference 10.4028/3-908451-31-0.1761 1 IUMRS International Conference in Asia 2006, IUMRS-ICA 2006, pp.1761 - 1764 IUMRS International Conference in Asia 2006, IUMRS-ICA 2006 1761 1764 US Jeju 2006-09-10 Solid State Phenomena 2-s2.0-38549083801