| prov:value
| - On its surface the y units N are covalently bonded, directly or by way of one or more spacers S. The support preferably comprises at least one inorganic oxide, such as silica, alumina, zeolites, MgO, ZrO2, TiO2, B2O3, CaO, ZnO, ThO2, Na2CO3, K2CO3, CaCO3, MgCO3, Na2SO4, Al2(SO4)3, BaSO4, KNO3, Mg(NO3)2, Al(NO3)3, Na2O, K2O, or Li2O, especially silica and/or alumina.
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