Abstract: This disclosure relates to a novel material based on potassium phosphate salt or cesium phosphate salt and silica, comprising at least one source of silica formed into shape with at least one powder of a potassium phosphate or cesium phosphate salt and the use of this material for the preparation of acrylic acid. The disclosure also relates to a process for preparing said material, comprising at least one step of mixing at least one powder of at least one source of silica with at least one powder of at least one potassium phosphate or cesium phosphate salt and at least one solvent, a step of forming into shape preferably by extrusion of the mixture obtained on conclusion of the mixing step and a step of preparing calcined extrudates and optionally a final hydrothermal treatment step.

Abstract: This disclosure relates to a novel material based on potassium phosphate salt or cesium phosphate salt and silica, comprising at least one source of silica formed into shape with at least one powder of a potassium phosphate or cesium phosphate salt and the use of this material for the preparation of acrylic acid. The disclosure also relates to a process for preparing said material, comprising at least one step of mixing at least one powder of at least one source of silica with at least one powder of at least one potassium phosphate or cesium phosphate salt and at least one solvent, a step of forming into shape preferably by extrusion of the mixture obtained on conclusion of the mixing step and a step of preparing calcined extrudates and optionally a final hydrothermal treatment step.

Abstract: The present invention relates to a catalyst comprising: (a) an aluminium-doped sulphated zirconium oxide, —with an aluminium content of 0.8 to 3.0% by weight of the catalyst, —with a cristallographic phase containing at least 80%, in particular at least 85% or at least 90%, of zirconium oxide in the tetragonal phase, —with a crystallinity index for the zirconium oxide of at least 55%, in particular of at least 60% or at least 65% or 70%; (b) a refractory oxide selected from silica and/or alumina; (c) a group VIIIB metal.

Abstract: The present invention relates to a method for the preparation of a microporous material shaped in the form of extrudates, tablets or beads having good mechanical crush strength and containing at least 90% by weight of KL zeolite (structural type LTL). This method comprises a stage of shaping a KL zeolite with at least one zeolitizable binder and at least one stage of zeolitization, in the presence of potassium hydroxide in one and/or the other of the stages, in order to obtain a material shaped in the form of extrudates, tablets or beads containing at least 90% by weight of KL zeolite and good mechanical crush strength.

Abstract: The invention relates to a process for the metathesis of olefins implemented with a catalyst comprising a mesoporous matrix and at least the elements molybdenum and silicon, said elements being incorporated into said matrix by means of at least two precursors of which at least one precursor contains molybdenum and at least one precursor contains silicon.

Abstract: The invention relates to a process for the metathesis of olefins implemented with a catalyst comprising a mesoporous matrix and at least the elements molybdenum and silicon, said elements being incorporated into said matrix by means of at least one precursor comprising molybdenum and silicon and having at least one sequence of Si—O—Mo bonds.

Abstract: The invention relates to a process for the metathesis of olefins implemented with a catalyst comprising a mesoporous matrix and at least the elements molybdenum and silicon, said elements being incorporated into said matrix by means of at least one precursor comprising molybdenum and silicon and having at least one sequence of Si—O—Mo bonds.

Abstract: The invention relates to a process for the metathesis of olefins implemented with a catalyst comprising a mesoporous matrix and at least the elements molybdenum and silicon, said elements being incorporated into said matrix by means of at least two precursors of which at least one precursor contains molybdenum and at least one precursor contains silicon.