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Hydrogenoliza glicerolu wodorem in situ i cząsteczkowym

Wołosiak-Hnat A., Milchert E.

Chemik

2013

Vol. 67, nr 6

572--579

Porównano przebieg hydrogenolizy w środowisku rozpuszczalnika protonowego, będącego źródłem wodoru in situ z hydrogenolizą w obecności wodoru cząsteczkowego. Jako źródło wodoru in situ zastosowano 1- i 2-propanol. Hydrogenolizy wodorem in situ wykonywano dwiema metodami: ciśnieniowo – stosując atmosferę gazu obojętnego (azotu) oraz bezciśnieniowo – bez wprowadzania wodoru cząsteczkowego i gazu obojętnego.

The comparison of the course of hydrogenolysis performed in protic solvent as a source of hydrogen in situ with hydrogenolysis carried out in the presence of molecular hydrogen was made. As a donor of hydrogen molecule 1- and 2-propanol were used. Hydrogenolyses with hydrogen generated in situ were conducted using two methods: under inert gas pressure (nitrogen) and pressureless – in the absence of inert gas and molecular hydrogen.

Influence of reduction time of copper based catalysts: Cu/Al2O3 and CuCr2O4 on hydrogenolysis of glycerol

Wołosiak-Hnat A., Milchert E., Lewandowski G., Grzmil B.

Polish Journal of Chemical Technology

2011

Vol. 13, nr 4

71-76

High activity of copper based catalysts for C-O bond hydro-dehydrogenation and their poor activity for C-C bond cleavage1 have prompted an attempt to apply such catalysts in the hydrogenolysis of glycerol to 1,2- and 1,3-propanediol. In the present study the infl uence of hydrogen reduction time of the Cu/ Al2O3 and CuCr2O4 copper catalysts on glycerol conversion and selectivity of transformation to propanediols and by-products was studied. At fi rst a general comparison was made between the commercial catalysts and those prepared by the co-precipitation method. As better results were obtained in the presence of catalysts prepared by co-precipitation, they were selected for further detailed studies of the influence of reduction time. For both prepared catalysts Cu/Al2O3 and CuCr2O4 the reduction time of 8 h was optimal. In the presence of Cu/Al2O3 catalyst the conversion of glycerol was 59.0%, selectivity of transformation to 1,2-propanediol 77.4% and selectivity to 1,3-propanediol 1.9%. In the presence of CuCr2O4 the glycerol conversion was 30.3% and selectivity to 1,2-propanediol 67.3%.