Hydration of propene over acidic zeolites

Comparison between catalytic and catalytic photo-assisted propene hydration by using supported heteropolyacid

“…The industrial propene catalytic hydration to 2propanol is carried out at moderate temperatures (ca. 150-200 • C) and pressure (2 MPa) in the presence of an acid catalyst as phosphoric acid supported on silica, strong acidic resins [1], beta zeolite [2] and other acidic zeolites [3], whereas the reverse reaction, i.e. the dehydration of 2-propanol is a reaction frequently used for the characterization of the acidic character of catalysts, as for instance supported heteropolyacids.…”

Hydration and etherification of propene over H-ZSM-5. 1. Kinetic study

“…Clearly, the data fit straight lines (through the origin), indicating that the Langmuir-Hinshelwood model is more appropriate for describing the rates of propene hydration and propene etherification over H-ZSM-5 than reversible first-order kinetics. Equation 4 was also valid for these reactions over aluminumrich H-ZSM-5 (1.01 mmol of Al/g; Sonnemans, 1993) and aluminum-poor H-ZSM-5 (0.09 mmol of Al/g). For small fractional yields of IPA or MIPE, ln(l -Y) equals -Y, and Propene Hydration and Etherification over H-ZSM-5 Varying in Aluminum Content.…”

“…In Figure 2 the "LH reaction rate constants" for propene hydration and propene etherification of the various H-ZSM-5 samples have been plotted against their aluminum content (the data of H-ZSM-5 containing 0.60 mmol of Al/g are not shown since this sample has a larger external surface area than the others; Sonnemans, 1993). The LH rate constants also attain a maximum at an Ind.…”

“…Despite the fact that zeolites such as ZSM-5 may offer a number of advantages over acidic resins, studies of the kinetics of alkene hydration and etherification over zeolites are hard to find. In a previous paper (Sonnemans, 1993) it was established that the kinetics of propene hydration over H-ZSM-5 are of a Langmuh^Hinshelwood type. This is not surprising in view of the facts that (i) propene and water differ strongly in polarity and (ii) similar alkene hydration kinetics were established over acidic ionexchange resins.…”

Catalytic Hydration of Propylene with MoO3/Al2O3 in Supercritical Water

“…When one of the mechanisms of the gas-phase catalytic reactions is consulted, the kinetic description of the propylene hydration rate is obtained by applying Langmuir−Hinshelwood (LH) kinetics where two reactants are competing with each other for the adsorption sites as eq 1, − where K P and K H are the adsorption equilibrium constants of propylene and water, respectively, k is the specific rate constant on the surface, and the reaction is assumed to be first order on the adsorbed propylene and water concentration individually. Because of the high concentration of water, we assume that The simplified LH rate equation is where …”