Influence of the Titanium Content in the Ti-MCM-41 Catalyst on the Course of the α-Pinene Isomerization Process

Autor: Joanna Sreńscek-Nazzal, Jadwiga Tołpa, Zvi C. Koren, Agnieszka Wróblewska, Piotr Miądlicki, Beata Michalkiewicz
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Catalysts, Vol 9, Iss 5, p 396 (2019)
Catalysts
Volume 9
Issue 5
ISSN: 2073-4344
Popis: Titanium-containing mesoporous silica catalysts with different Ti contents were prepared by the sol&ndash
gel method, whereby the molar ratios of silicon to titanium in the crystallization gel amounted to, respectively, 40:1, 30:1, 20:1 and 10:1. The produced Ti-MCM-41 materials were characterized by the following instrumental methods: XRD, UV-Vis, FT-IR, SEM, and XRF. Textural parameters were also determined for these materials by means of the N2 adsorption/desorption method. The activities of these catalysts were investigated in the &alpha
pinene isomerization process. The most active catalyst was found to be the material with the molar ratio of Si:Ti equal to 10:1, which contained 12.09 wt% Ti. This catalyst was used in the extended studies on the &alpha
pinene isomerization process, and the most favorable conditions for this reaction were found to be temperature of 160 °
C, reaction time of 7 h, with the catalyst composition of 7.5 wt% relative to &alpha
pinene. These studies showed that the most active catalyst, at the best reaction conditions, allowed for the attainment of 100% conversion of &alpha
pinene over a period of 7 h. After this time the selectivities (in mol%) of the main products were as follows: camphene (35.45) and limonene (21.32). Moreover, other products with lower selectivities were formed: &gamma
terpinene (4.38), &alpha
terpinene (8.12), terpinolene (11.16), p-cymene (6.61), and &alpha
phellandrene (1.58).
Databáze: OpenAIRE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje