New PtSn structured catalysts with ZnAl2O4 thin film for n-butane dehydrogenation reaction

Stability studies of PtSn structured catalysts supported on thin layers of MAl2O4 (M: Mg, or Zn) for paraffins dehydrogenation reactions

“…The reduction zone at higher temperature would be assigned to the reduction of Sn oxides with strong interaction with the support. [ 48 ] The catalyst after cycles shows two main reduction peaks, the first one located around 100°C would correspond to the shoulder at low temperatures in the fresh catalyst and be attributed to the reduction of Pt oxides. The second peak, lower and wider and located around 260°C, corresponds to the reduction of PtSn species.…”

“…The first one is a shoulder at low temperature attributed to the reduction of platinum oxides, and the second and third peaks would correspond to Pt‐Sn co‐reduction, probably with the formation of PtSn alloys. [ 48 ] After the cycles, the PtSn/Sp‐Zn‐BNP catalyst shows a reduction peak located at 121°C, assigned to platinum oxides reduction, and a broad reduction peak located between 170–355°C. This last peak could correspond to Pt‐Sn co‐reduction with alloy formation.…”

“…A detailed description of both coating methods was previously published. [47,48] Figure 1 shows photomicrographs obtained by scanning electron microscopy of the synthesized supports. In Figure 1A,B, the MgAl 2 O 4 layers deposited on the spheres of about 5-14 μm thickness can be seen.…”

“…In this sense, the structured catalysts of PtSn supported on thin films of MgAl 2 O 4 or ZnAl 2 O 4 deposited on α-Al 2 O 3 spheres applied in the n-butane dehydrogenation reaction showed good catalytic performance. [47,48] Other studies developed structured supports by coating of γ-Al 2 O 3 in compact spheres and studied Pt, PtSn, and PtGe catalysts for the n-butane and n-decane dehydrogenation reactions. [49][50][51] On the other hand, there are works that study the coating with MgAl 2 O 4 on metallic foams, micromonoliths of FeCrAl alloys, and honeycomb cordierite ceramics, used in the synthesis of Ni, Ru-Ni, and Pt catalysts for steam reforming, CO 2 metanation, and hydrogen combustion.…”

Bifunctional catalyst of mordenite‐ and alumina‐supported platinum for isobutane hydroisomerization to n‐butane

“…In the process of steam cracking, the ethylene yields of n ‐butane and isobutane are 48% and 18%, respectively. [ 2 ] N ‐butane is also used for dehydrogenation to butene, [ 3,4 ] oxidation to anhydride [ 5,6 ] and acetic acid, and substitution to halobutane and nitrobutane. In addition, methyl tert‐butyl ether (MTBE), a main downstream product of isobutane, is banned due to its toxicity and environmental unfriendliness, resulting in overcapacity of isobutane.…”