Abstract
The reaction of the liquid-phase hydrogenation of benzaldehyde is studied in two modes: at room temperature and atmospheric pressure, and at a temperature of 70°С and a pressure of 0.5 MPa on Pt/CeO2–ZrО2 catalysts with metal contents of 1 to 0.025 wt %. A 96% conversion of benzaldehyde is obtained on 1% Pt/CeO2–ZrО2 catalysts at room temperature, while a 97% conversion is obtained on 0.1% Pt/CeO2–ZrО2 catalysts at elevated temperatures. The selectivity of the formation of benzyl alcohol is in all cases 100%.
Highlights
Benzyl alcohol (BnOH) is an important intermediate in the production of paints, varnishes [1], and vitamins [2]
The hydrogen uptake by the 0.25% Pt/CZ catalyst in this temperature range was substantially lower than those of 1% Pt/CZ and 0.5% Pt/CZ, and totalled 0.11 mmol/g. Even at such low contents of the noble metal, we observed the absorption of Н2 at room temperature
Even though samples with low contents of platinum were less active at room temperature and atmospheric pressure, we may assume they have high activity when tested at elevated pressures and/or temperatures, due to the observed intense absorption of hydrogen up to 250°C
Summary
Benzyl alcohol (BnOH) is an important intermediate in the production of paints, varnishes [1], and vitamins [2]. Carrying out the reaction of benzaldehyde hydrogenation on a commercial catalyst 1% Pd/C allowed to obtain BnOH with a selectivity of 99% at room temperature and a pressure of 0.8 MPa. the conversion after 1 h of the reaction was only 11%, and complete conversion under these conditions was achieved in 24 h [7].
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