Abstract
This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene. Cobalt catalysts modified with aluminum oxide having size between 50 to 500 nm were synthesized. Chemical contents and structure of carrier were investigated. The catalytic activity of 5% Со/clay and 5% Co/SiAl catalysts at acetylene hydrogenation was studied in the temperature range 100-180 ℃, with a ratio of 1:2 of acetylene and hydrogen. The ethylene yield is 87.8% in modifying the cobalt catalyst with aluminum oxide, whereas with the same process parameters, the ethylene yield is 72%. 5% Cobalt catalysts modified with 1.5% aluminum oxides are more active in hydrogenation acetylene process than 5% Со/clay 450 ℃ catalyst.
Highlights
This work is devoted to the study of the influence of aluminum oxide content on the activity of cobalt catalysts in the reaction of selective hydrogenation of acetylene to ethylene
Clay consists of half of silica SiO2 (Table 1), and according to the content of aluminum oxide, it belongs to semi-acidic materials
As can be seen from figure 4, when modifying the cobalt catalyst with aluminum oxide, the ethylene yield is 87.8 %, whereas with the same process parameters, the ethylene yield is 72 %. 5 % Cobalt catalysts modified with 1,5 % aluminum oxides are more active in hydrogenation acetylene process than 5 % Со/clay 450 °C catalyst
Summary
Clay from Tonkeris deposit was used as a carrier, the structure of which contained montmorillonite (Al2[0H]2 {Si4010}⋅mH20), a valuable clay mineral. The catalytic activity of the synthesized catalysts was studied on a flow-type hydrogenation unit at atmospheric pressure and without in the temperature range 100-180 °C. The catalyst was pre-treated in an argon current at a temperature of 100 -120 °C for 80 min., restored in a hydrogen current for. When the set temperature was reached in the reactor, the flow of acetylene and hydrogen was dosed at different ratios. The catalytic activity of the synthesized catalysts was studied using a developed hydrogenation unit. The analysis was performed in the following mode: sample volume (gas) 4 μl in non-flow division mode, chromatographic capillary column DB35MS (Agilent, USA) 30m x 0.25 mm, film thickness 0.25 microns, column thermostat temperature: 35°C (10 min exposure), evaporator temperature: 80°C, detection mode – ion monitoring in the range m/z 10-550
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