Microgeometry of Pt/mordenite and stereoselectivity of methylcyclopentane ring-opening catalysis

Advanced thermally stable jet fuels. Technical progress report, April 1996--June 1996

“…Table 4 gives the results for naphthalene hydrogenation on Pt/HM38 and WHY obtained in ths work. Figure 6 compares the present results with those from recent work in this laboratory using W A l 2 0 3 (Lin and Song, 1996). The Pt/HM38 catalyst appears to be more active than the WHY and Pt/ AI203 catalyst.…”

“…It has been reported by Sachtler et ai. that Pt atoms are located in the side-pockets of the main channel in Pvmordenite (Lerner et al, 1992;Sachtler and Zhange, 1993). If this is also achieved for Pd, molecular H2 can dissociate on the metal inside the side-pocket channel, but the chemisorption of large-sized organosulfur compounds is difficult on the metal located in the side pocket channel (Hypothesis B) .…”

Simultaneous naphthalene and thiophene hydrogenation over Ni(X)–Pt/HMOR catalysts

“…1. The presence of this peak has already been reported and was associated with the diffusion of hydrogen into the zeolite and the elution of the inert gas from the pore system into the H 2 /Ar reduction mixture [17,18]. In our case, because the HMOR has a dual pore size system, it is possible that a second peak, associated to the gas elution from the side pockets of the mordenite, could appear.…”

“…1) shows the "apparent" reduction peak at 333 K, but with a shoulder at 390 K. On similar Pt/HMOR catalysts, the group of Sachtler [17,19] reported a reduction peak at 330 K due to the PtO 2 reduction. In addition, according to Yuvaraj [16], Pt oxide located in the external surface of zeolites is reduced at temperatures, ca.…”

“…This suggests the reduction of some Pt species in high interaction with the support; most likely, PtO in the zeolite. Lerner [17] signaled that the reductions of Pt oxide species are complete at 573 K.…”