Radioisotopic investigation of the oleic acid-1- super(14)C HDO reaction pathways on sulfided Mo/P/Al sub(2)O sub(3) and NiW/Al sub(2)O sub(3) catalysts

Oleic acid labeled with radioactive carbon at the carboxyl group (oleic acid-1- super(14)C) has been applied to follow the hydrotreating process (reactions) of this compound over Mo/P/Al sub(2)O sub(3) and NiW/Al sub(2)O sub(3) catalysts, treated with H sub(2)S. A flow-system catalytic reactor equipped with a special unit for microanalysis was applied for the study of the decarboxylation, decarbonylation and hydrodeoxygenation reactions at atmospheric pressure in the stream of hydrogen gas of different rates in the temperature range of 573-673 K. The gas products contained only super(14)CO, super(14)CO sub(2) and super(14)CH sub(4). It is stated that at the applied conditions, only small amounts of sulfur leave the super(35)S-labeled sulfided catalyst samples, consequently the sulfur loss of the samples can influence the catalytic behavior of these samples only after a longer period. The experiments serve for a general conclusion: the radioactive microanalytical method based on the application of oleic acid-1- super(14)C, is suitable for testing and evaluation of new catalyst samples in hydrotreating process of natural triglycerides.