Fecha de publicación: 29/11/2007 Fuente: WIPO "abeja" The clays wherefrom said monoliths are formed are of useful environmental application because of their coincident abundance, low cost, extrudability and ability to adsorb volatile organic compounds. The present invention has the objective of increasing the value of an abundant economic natural resource in the north of Morocco, which to date has solely been used for the manufacture of traditional pottery objects, through its use in environmental protection technologies. The Moroccan clays studied may be employed in controlling contaminant emissions into the atmosphere from various types of industry, both in the form of powder and of monoliths having a honeycomb structure. This design having recognised advantages may be achieved with said materials without the need for additives other than water and thus without making the process of preparation expensive.