Abstract
Cu-H-MCM-41, H-MCM-41 and Na-MCM-41 mesoporous molecular sieve catalysts were synthesized, characterized and investigated in the isomerization of 1-butene to isobutene. Introduction of copper in MCM-41 was found to play a positive role in enhancing the conversion of 1-butene and yield of isobutene and Cu-H-MCM-41 exhibited higher conversion of 1-butene and yield to isobutene than H-MCM-41 and Na-MCM-41 catalysts. The pretreatments of Cu-H-MCM-41 catalyst with synthetic air or hydrogen were observed to influence the 1-butene conversion, yield of isobutene and selectivity to isobutene. Pre-treated with the synthetic air the Cu-H-MCM-41-Ox catalyst exhibited higher conversion of 1-butene, yield of isobutene and selectivity to isobutene than hydrogen pre-treated Cu-H-MCM-41-Red. The reason for such a behavior of Cu-H-MCM-41-Red is the reduction of copper species to metallic form. The X-ray powder diffraction pattern of Cu-H-MCM-41-Red exhibited a peak attributed to the reduction of Cu2+ to Cu0. FTIR spectra of adsorbed pyridine showed the presence of Brønsted and Lewis acid sites in the H-MCM-41, Na-MCM-41 and Cu-H-MCM-41 catalysts.
| Original language | English |
|---|---|
| Pages (from-to) | 105-110 |
| Number of pages | 6 |
| Journal | Catalysis Letters |
| Volume | 78 |
| Issue number | 1-4 |
| DOIs | |
| Publication status | Published - Mar 2002 |
| MoE publication type | A1 Journal article-refereed |
Funding
This work is part of the activities at the Åbo Akademi Process Chemistry Group within the Finnish Centre of Excellence Programme (2000–2005) by the Academy of Finland. Financial support from Neste Foundation to Ville Nieminen is gratefully acknowledged.
Keywords
- 1-butene
- Catalysts
- Copper
- Isomerization
- MCM-41
- Mesoporous