Abstract: A process for the isomerization of xylenes using the hydrogen form of new zeolite "nu-1" having a silica to alumina ratio of 20 to 150 and a characteristic X-ray diffraction pattern and adsorption properties.

Abstract: A catalyst composition for hydrogenative purification of hydrocarbons contains a divalent oxide such as CoO, a polyvalent oxide such as MoO.sub.3, pseudobohmite and/or pseudogamma alumina and preferably also a clay mineral and is made using a defined procedure in which active components are added before and after shaping by wet granulation or extrusion.

Abstract: New zeolite "nu-1" has a silica to alumina ratio of 20 to 150 and a characteristic X-ray diffraction pattern and adsorption properties. It is made from a reaction mixture containing a methylated quaternary compound. In its hydrogen form it is highly active and selective in the isomerization of xylenes.

Abstract: In the manufacture of synthetic zeolites, the formation of unwanted, contaminating zeolites is inhibited by the addition to the reactant mixture of a basic nitrogen-containing dye, and makes it possible to synthesize new zeolites AG5 and AG6 herein defined by their compositions and X-ray diffraction patterns.

Abstract: The invention provides a method of preparing zeolite Y of high degree of purity and having a silica to alumina molar ratio of from greater than 3 up to about 6.2 which comprises preparing an aluminosilicate reaction mixture having oxide molar ratios of SiO.sub.2 /Al.sub.2 O.sub.3, Na.sub.2 O/SiO.sub.2 and H.sub.2 O/Na.sub.2 O lying within specified ranges, at least part of the siliceous component of the reaction mixture being a particular hydrated sodium metasilicate and then heating the reaction mixture until zeolite Y crystallizes from the reaction mixture, the particular hydrated sodium metasilicate being defined by its ability to form substantially pure zeolite X under specified conditions.