Synthesis and Investigation of Pt/MgAlSnOx Catalysts for Decane Dehydrogenation
L. N. STEPANOVA1, O. B. BELSKAYA1,2, V. A. LIKHOLOBOV1,3
1Institute of Hydrocarbons Processing, Siberian Branch of the Russian Academy of Sciences, Ul. Neftezаvodskаya 54, Omsk 644040 (Russia)
2Omsk State Technical University, Prospekt Mira 11, Omsk 644050 (Russia)
3Omsk Scientific Centre, Siberian Branch of the Russian Academy of Sciences, Prospekt Karla Marksa 15, Omsk 644024 (Russia)
Keywords: слоистые двойные гидроксиды, платино-оловянные катализаторы, дегидрирование н-декана, layered double hydroxides, platinum-tin catalysts, n-decane dehydrogenation
Abstract
Synthesis of layered double hydroxides (LDH) of MgAlSn with the ratio of Mg/(Al + Sn) = 3 and Sn/(Sn + Al), equal to 1, 5, 10 and 30 %, was carried out. The structural and acid-base properties of these compounds and the formation of the oxide phase were studied using a set of physicochemical methods (XPA, TA-DTG, СО2 adsorption). It is shown that LDH obtained through co-precipitation have a single-phase composition for Sn/(Sn + Al) < 30 %. With an increase in tin content in the support, a side phase Mg(Sn(OH)6) is formed. According to the data of СО2 adsorption, the introduction of tin into LDH layers does not worsen their basic properties. Tin within the support promotes modification of the properties of platinum centres affecting the catalytic properties of Pt/MgAlSnO x in the reaction of n- decane dehydrogenation. The dependence of n- decane transformation degree on tin content is extremal with the maximum at Sn/(Sn + Al) = 1 %, while the maximal yields of olefins and maximal selectivity are observed for the sample with Sn/(Sn + Al) = 5 %. The catalytic characteristics of the Pt/MgAl-5 % SnO x sample are comparable with those for the industrial catalyst tested under similar conditions, which points to the promising character of further studies of the systems based on tin-containing LDH.
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