The invention relates to a catalyst coating for use in a hydrolysis catalyst (H- catalyst) for the reduction of nitrogen oxides. The invention relates also to a manufacturing method for such a coating, as well as to a catalyst structure and its use. The H-catalyst comprises alkaline compounds, which are capable of adsorbing HNCO and/or nitrogen oxides and which include alkali and alkaline earth metals, lanthanum and/or yttrium and/or hafnium and/or prasedium and/or gallium, and/or zirconium for promoting reduction, such as for promoting the hydrolysis of urea and the formation of ammonia and/or the selective re- duction of nitrogen oxides.