Coking and deactivation of boron modified Al-MCM-41 for vapor-phase Beckmann rearrangement reaction

2013 ◽  
Vol 366 ◽  
pp. 179-185 ◽  
Author(s):  
Dongshun Zhang ◽  
Rijie Wang ◽  
Lijun Wang ◽  
Xiaoxia Yang
Keyword(s):  
Vapor Phase ◽  
Beckmann Rearrangement ◽  
Rearrangement Reaction ◽  
Mcm 41

Synthesis and Catalytic Application of Mesoporous Molecular Sieves MCM-41 Containing Niobium and Tantalum

2007 ◽  
Vol 124-126 ◽  
pp. 1761-1764 ◽  
Author(s):  
Hun Jung ◽  
Kwang Deog Jung ◽  
Oh Shim Joo ◽  
Sun Jin Kim
Keyword(s):  
Vapor Phase ◽  
Molecular Sieves ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Weak Acid ◽  
Beckmann Rearrangement ◽  
Mesoporous Molecular Sieves ◽  
Cyclohexanone Oxime ◽  
Catalytic Application ◽  
Mcm 41

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 ε-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.

Niobium doped hexagonal mesoporous silica (HMS-X) catalyst for vapor phase Beckmann rearrangement reaction

RSC Advances ◽  
2014 ◽  
Vol 4 (2) ◽  
pp. 845-854 ◽  
Author(s):  
Sandip Mandal ◽  
Chiranjit Santra ◽  
Rawesh Kumar ◽  
Malay Pramanik ◽  
Sumbul Rahman ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Vapor Phase ◽  
Beckmann Rearrangement ◽  
Hexagonal Mesoporous Silica ◽  
Niobium Doped ◽  
Rearrangement Reaction

scholarly journals Highly stable In-SBA-15 catalyst for vapor phase Beckmann rearrangement reaction

2016 ◽  
Vol 234 ◽  
pp. 293-302 ◽  
Author(s):  
Rawesh Kumar ◽  
Sneha Shah ◽  
Jitendra Bahadur ◽  
Yuri B. Melnichenko ◽  
Debasis Sen ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Beckmann Rearrangement ◽  
Rearrangement Reaction

Vapor-phase Beckmann rearrangement of cyclohexanone oxime over phosphorus modified Si-MCM-41

2010 ◽  
Vol 101 (2) ◽  
pp. 455-463 ◽  
Author(s):  
Dongshun Zhang ◽  
Rijie Wang ◽  
Xiaoxia Yang ◽  
Wensheng Yao
Keyword(s):  
Vapor Phase ◽  
Beckmann Rearrangement ◽  
Cyclohexanone Oxime ◽  
Mcm 41
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