Extended Data Fig. 11: Coking-resistant properties of 0.25%Pt–Sn@S-1.
From: Pt migration–lockup in zeolite for stable propane dehydrogenation catalyst
a, Thermogravimetric analysis of spent 0.25%Pt–Sn@S-1 catalysts after 96 h in PDH. Catalytic test conditions: atmospheric pressure, 100% C3H8, WHSV = 5.3 h−1 and T = 600 °C. b, SEM images of spent 0.25%Pt–Sn@S-1(4.00 μm) after 96 h in PDH. c, Spatiotemporal distribution obtained by SIM of aromatic hydrocarbons in a single crystal of spent 0.25%Pt–Sn@S-1(4.00 μm) at different reaction times. d, STEM images of the spent 0.25%Pt–Sn@S-1(4.00 μm) after 96 h in PDH. e, Coking-resistant mechanism of the MFI framework and the scheme of molecular size of aromatic hydrocarbons. Notes: all of the samples were exposed to air during measurement of SIM. The dimensions of coke precursors were measured by Materials Studio and presented by van der Waals radius.
