Abstract: The invention relates to a device (1) for evaluation of at least one performance criterion of heterogeneous catalysts, comprising; at least one reactant source (2), at least one reaction zone equipped with at least one catalyst and connected to at least one reactant source (2) in such a way as to produce, in each reaction zone, a heterogeneous catalytic reaction between each catalyst present in the reaction zone and the reactant or reactants coming from each reactant source (2) connected to the reaction zone, and means for evaluation of at least one performance criterion of heterogeneous catalysts, characterized in that the device (1) further comprises a gas chromatograph and in that each reaction zone (9) is situated in an injector (8) of the gas chromatograph.

Abstract: The invention relates to a method for preparing acrolein from glycerol or glycerin, according to which dehydration of glycerol or glycerin is carried out in the presence of a catalyst which consists in at least one silica modified with zirconium dioxide, titanium dioxide or tungsten trioxide or any combination of these oxides, and a heteropolyacid. This method may be used for making 3-(methylthio)propionic aldehyde (MMP), 2-hydroxy-4-methylthiobutyronitrile (HMBTN), methionine or its analogs, from acrolein.

Abstract: The invention relates to a method for preparing acrolein from glycerol or glycerin, according to which dehydration of glycerol or glycerin is carried out in the presence of a catalyst which consists in at least one silica modified with zirconium dioxide, titanium dioxide or tungsten trioxide or any combination of these oxides, and a heteropolyacid. This method may be used for making 3-(methylthio)propionic aldehyde (MMP), 2-hydroxy-4-methylthiobutyronitrile (HMBTN), methionine or its analogs, from acrolein.

Abstract: The use of a complex oxide having the following composition (I). M012VaX1bX2cX3dX4eOx (I) wherein Mo is molybdenum; V is vanadium; 0 is oxygen; X1 is at least one element selected from tungsten, titanium, tantalum and niobium; X2 is at least one element selected from copper, antimony, tellurium and bismuth; X3 is at least one element selected from alkaline earth metals; X4 is at least one element selected from alkaline metals; and O<a?10; O?b?4; 0<c?5; O<d?2; 0?e?2; and x is a numerical value determined by the extents of the oxidation of the other elements, as a catalyst in the preparation of a partial oxidation product of a lower alcohol by direct oxidation of a lower alcohol in the vapor phase.