Propane combustion over supported Pt catalysts

Abstract

We prepared Pt catalysts supported on various metal oxides, viz., ZrO 2 , CeO 2 , TiO 2 , yttria-stabilized zirconia (YSZ), SiO 2 , SiO 2 -Al 2 O 3 , and c-Al 2 O 3 , using an incipient wetness method and applied them to propane combustion. In the cases of ZrO 2 -, CeO 2 -, and TiO 2 -supported Pt catalysts, supports with different surface areas were also used. The Pt dispersion in Pt catalysts supported on metal oxides increased with increasing surface area of the support for the same metal oxide. Pt catalysts on supports with lower surface areas (ZrO 2 , CeO 2 , and TiO 2 ) showed higher catalytic activities for propane combustion than did Pt catalysts on supports with higher surface areas. The catalytic activity decreased in the following order: Pt/ZrO 2 (2) [ Pt/CeO 2 (9) [ Pt/TiO 2 (1) = Pt/SiO 2 (350) [ Pt/ZrO 2 (18) = Pt/YSZ [ Pt/ TiO 2 (330) [ Pt/SiO 2 -Al 2 O 3 (350) [ Pt/ZrO 2 (73) [ Pt/c-Al 2 O 3 (180) [ Pt/CeO 2 (160). The catalytic activity is inversely proportional to the amount of O 2 chemisorbed up to the reaction temperature. It can be concluded that metallic Pt is essential for propane combustion and is maintained for the Pt catalysts with large Pt metal particles, which can be prepared by using a support with a low surface area.

Propane combustion over Pt/Al2O3 catalysts with different crystalline structures of alumina

“…This result indicates that the larger Pt particles, which were prepared on supports with a low surface area, are more efficient catalysts for propane combustion than the smaller Pt particles, which were prepared on supports with a high surface area. The results are in agreement with those of a previous report stating that catalysts with small Pt particles exhibited low catalytic activity because of facile oxidation by O 2 [9].…”

“…To enhance the performance of Pt-based catalysts for low-temperature propane combustion, several factors that affect the catalytic performance have been examined, including the effects of different supports such as Al 2 O 3 , SiO 2 , SiO 2 -Al 2 O 3 , ZrO 2 , yttria-stabilized zirconia, SO 4 2− -ZrO 2 , CeO 2 , MgO, La 2 O 3 , TiO 2 , and zeolites [7][8][9][10][11][12][13][14][15][16][17]. The physicochemical properties of the support reportedly affect the particle size of Pt and the oxidation state of the Pt species, thereby impacting the catalytic activity for propane combustion.…”

“…The physicochemical properties of the support reportedly affect the particle size of Pt and the oxidation state of the Pt species, thereby impacting the catalytic activity for propane combustion. Park et al reported that the dispersion of Pt in Pt catalysts supported on metal oxides increased with increasing surface area of the support for the same metal oxide, and that Pt catalysts on supports with lower surface areas (ZrO 2 , CeO 2 , and TiO 2 ) exhibited higher catalytic activity for propane combustion than Pt catalysts on supports with higher surface areas [9]. Hattori' s group asserted that propane combustion over Pt-based catalysts was structuresensitive and the turnover frequency (TOF) increased with increasing acid strength of the support because electrophilic support materials exhibited higher oxidation resistance than the electrophobic congeners [7,8].…”

Effect of Co and Fe substitution on catalytic VOCs removal on zinc aluminate

“…The platinum catalysts supported on spinel materials prepared in the present work, as the result of zinc aluminate substitution, show promising performance in the deep propane oxidation and similar or better to that already reported in the literature for other Pt catalysts supported on simple or mixed-metal oxides. Park et al [39] have shown that full conversion temperature (T 100% ) for ∼1 wt.% Pt supported on Al 2 O 3 -SiO 2 , ZrO 2 , CeO 2 and Al 2 O 3 was 200, 275, 300 and 280 • C, respectively, when 1 mol% C 3 H 8 and 5 mol% O 2 in He with flow rate of 100 ml/min were used. Yoshida et al [40] reported the effect of support and additive on Pt catalyst activity in propane combustion showing that T 100% was between 280 and 500 • C, depending on the nature of the support and additive used.…”

An experimental investigation of catalytic oxidation of propane using temperature controlled Pt, Pd, SnO2, and 90% SnO2–10% Pt catalysts

“…The platinum and palladium catalysts served as a baseline by which to compare catalyst performance. It is well known that the noble metal support affects catalyst performance, 1,8 and tin has been demonstrated to increase the catalytic activity of Pt in CO oxidation. 9 Tin is also an important co-catalyst in propane dehydrogenation.…”