Abstract
Abstract Direct incorporation of platinum (Pt) and 12-tungstophosphoric acid H 3 PW 12 O 40 (HPW) into mesoporous MSU-type silica was achieved by using a mixture of cationic and non-ionic surfactants, such as cetyltrimethylammonium (C 16 TMA + ) and Triton (TX-100). Various amounts of Pt (0.3–7 wt%) and HPW (9–49 wt%) were incorporated and the obtained materials were characterized by X-ray diffraction (XRD), chemical and thermal (TG–DTA) analyses, electron microscopies (SEM, TEM), N 2 adsorption–desorption measurements, and solid state 31 P NMR spectroscopy. The catalytic activity of the calcined silica-based mesoporous molecular sieves containing tungstophosphoric acid (HPW), platinum and platinum–tungstophosphoric acid (Pt/HPW) for NO x reduction with propene was investigated in the presence of oxygen. Samples which contain small amounts of Pt and moderate loadings of HPW were found the most active (up to 97% at 250 °C and for 1 vol.% O 2 ).
Published Version
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