Surface interactions in the Pt/-AlO system

Synthesis of nanosized Al-HMS and its application in deep oxidation of benzene

“…So, which one is the main reason causing the 12.2% activity difference? Actually, our above results (The activity sequence of different supports is: Al-HMS > HMS > Al 2 O 3 ) and former report (the extraframework aluminum is easy to decompose to Al 2 O 3 that will decrease the activity of Pd by forming the PtO 2 -Al 2 O 3 complex [12]) prove that framework aluminum is more advantaged than extra-framework aluminum for this reaction. So, we thought the poor textural uniformity of Al-HMS (Si/Al = 20), which is harmful to the diffusion speed of substrate and products, is the main factor inducing the activity decrease.…”

Destruction of volatile organic compounds by catalytic oxidation

“…The major drawbacks of traditional metal oxide supports, such as Al 2 O 3 , SiO 2 , zeolites, are: the low thermal conductivity -which causes sintering of supported-metal on hot spots of the support during deep and exothermic oxidation of VOCs (Yao et al, 1979), the reaction with water vapour at elevated temperatures and the vaporization of noble metals like oxychlorides (Völter et al, 1987). All these deficiencies cause the attempt of non-oxide materials as supports of catalyst used on catalytic oxidation of VOCs.…”

“…In recent works (Pliangos et al, 1997;Papaefthimiou et al, 1998;Garetto and Apesteguia, 2000) it was found that platinum interacts with the carrier affecting the performance of the catalyst. Some authors (Yao et al, 1979) have reported that these interactions bring a negative influence on the catalytic activity. Concerning the thermal resistance, Pd was said to be more resistant to thermal sintering in an oxidizing environment than Pt (Heck and Farrauto, 1995;Hegedus et al, 1979;Spivey and Butt, 1992).…”

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

“…49 Similarly, the higher the initial metal content, then the more difficult it will be to re-disperse the metal. 49,50 Numerous re-dispersion strategies have been utilized for a wide range of metals (e.g. Pt, Au and Ag) and these are discussed in the subsequent sections.…”