UOP 303-19

This method is for determining trace metals in fresh, regenerated and spent alumina-, silica-, or aluminosilicate- (silica/alumina-) based catalysts by Inductively Coupled Plasma - Optical Emission Spectroscopy (ICP-OES). Ordinarily, the metals determined include calcium (Ca), chromium (Cr), cobalt (Co), copper (Cu), iron (Fe), lead (Pb), magnesium (Mg), manganese (Mn), molybdenum (Mo), nickel (Ni), potassium (K), silicon (Si), sodium (Na), tin (Sn), titanium (Ti), vanadium (V), and zinc (Zn). Silicon is not determined when it is a component of the catalyst base. Arsenic (As) and phosphorous (P) can be determined but are not ordinarily present on fresh catalysts. They may, however, be present on regenerated or spent catalyst. Barium (Ba) and mercury (Hg) cannot be determined because barium sulfate precipitates and mercury volatilizes. Barium can be determined using the fusion technique described in UOP Method 926, "Silicon and Aluminum in Fresh Catalysts by Lithium Tetraborate Fusion/ ICP-OES." Other elements also can be determined, if required. The specified elements can be determined within the concentration ranges listed in Table 1. Typical concentration ranges are 0.005-1.0 mass-%.

This method is not applicable to noble metals and modifiers on catalysts.

This method cannot be used for determining metals in alpha-alumina based catalyst because alphaalumina is not solubilized under the conditions of this procedure.

An alternative microwave-based dissolution technique is described in the Appendix.