Characterization and Evaluation of Methylcyclopentane and Cyclohexane Ring Opening over Ir/ZrO2–MoO3 Catalysts

Abstract

A series of Ir/ZrO 2 -MoO 3 catalysts with different molybdenum concentrations and iridium loadings were synthesized and studied for ring opening of methylcyclopentane and cyclohexane to n-hexane. X-ray photoelectron spectroscopy (XPS) indicated that molybdenum and zirconium were present mainly in the form of MoO 3 and ZrO 2 , respectively, and temperature programmed desorption (TPD) indicated the acidity was strongly correlated to the MoO 3 content. Iridium was incorporated by wet impregnation to a desired loading of 30 and 300 ppmw with the concentration verified by instrumental neutron activation analysis (INAA). The vapor phase conversion of methylcyclopentane and the liquid phase conversion of cyclohexane were subsequently studied to determine catalytic activity and selectivity. The Ir/ZrO 2 -MoO 3 catalyst with 3.5 at.% molybdenum and 30 ppmw iridium produced an overall relatively high activity and selectivity for the conversion of cyclohexane to n-hexane.

Selective Ring Opening of Methylcyclopentane and Methylcyclohexane Over Iridium Bifunctional Catalysts Supported on Surface Modified γ-Al2O3, SiO2 and Ultra Stable Y Zeolites

“…Conversion, yield and selectivity were reported on mass basis and denoted in percentage. Table 2 gives the conversion (%) of MCP at 290°C under a pressure of 30 bar for 1 h. Here a batch type high pressure reactor was used in the present study while all other previous reports describe a fixed bed reactor [23,24]. However, the results obtained were found to be comparable to those reported earlier by using fixed bed reactors.…”

ZrO2–MoO3 for the Acetalization of 1,3-Propanediol from Dilute Solutions

“…The decrease the 1,3-PD conversion rate with increased MoO 3 loading might be due to the dispersion of active oxide components such as the coating of excess MoO 3 covering the active site. 31,32 Figure 5 shows the catalyst activities of ZrO 2 −MoO 3 materials with different MoO 3 loadings on the hydrolysis of 2MD. It is worth noticing that ZrO 2 −10 wt % MoO 3 showed the best catalytic performance.…”

“…However, there was a decreasing conversion rate after reaching a maximum with ZrO 2 –10 wt % MoO 3 . The decrease in the 1,3-PD conversion rate with increased MoO 3 loading might be due to the dispersion of active oxide components such as the coating of excess MoO 3 covering the active site. , …”

One-Pot Conversion of Bio-oil to Diesel- and Jet-Fuel-Range Hydrocarbons in Supercritical Cyclohexane

“…ZrO 2 support was synthesized according to the reported method. , Ten grams (10 g) of ZrOCl 2 ·8H 2 O was dissolved in 50 mL deionized water, and then the solution was heated and maintained at 100 °C with vigorous stirring. Ammonium hydroxide was slowly added dropwise into the solution and obtained a final pH of 9–10.…”