Propane dehydrogenation catalyzed by in-situ partially reduced zinc cations confined in zeolites

Advances in zeolite-supported metal catalysts for propane dehydrogenation

“…Besides zeolite-supported Pt catalysts, some cost-effective zeolite-supported non-noble monometal catalysts (e.g., Ga, 57,62,98,[106][107][108][109][110] Sn, 63 and Zn 102,111 ) and non-noble monometal oxide catalysts (such as ZnO, 45,56,61,65,66 CrO x , 60 CoO, 46,58 and VO x 64,112,113 ) were also extensively studied for PDH reactions. Supported CrO x catalysts have been used for a long time in industrial PDH plants since 1964, one of which is the FBD-4 process that uses Al 2 O 3 as a support.…”

“…Single-site Zn catalysts have also been widely investigated due to their relatively low cost and low toxicity. 102,127,128 Recently, Li and co-workers reported the stabilization of single-site zinc inside the silicalite-1 zeolite (Zn@S-1) via the in situ hydrothermal method by introducing the [Zn(en) 3 ] 2+ complex in the synthesis gel. 102 Fourier transform infrared spectroscopy, 29 Si magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) and XPS measurements revealed that atomically dispersed Zn 2+ species were trapped and stabilized by the Si-OH groups in Zn@S-1.…”

“…102,127,128 Recently, Li and co-workers reported the stabilization of single-site zinc inside the silicalite-1 zeolite (Zn@S-1) via the in situ hydrothermal method by introducing the [Zn(en) 3 ] 2+ complex in the synthesis gel. 102 Fourier transform infrared spectroscopy, 29 Si magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) and XPS measurements revealed that atomically dispersed Zn 2+ species were trapped and stabilized by the Si-OH groups in Zn@S-1. In contrast, ZnO x nanoparticles with a size of 2-5 nm were observed in its Zn/S-1 counterpart synthesized via the impregnation method.…”

“…Copyright 2021, the American Chemical Society. (c and d) Catalytic performance of S-1 and various S-1 zeolite-supported Zn catalysts with different Zn loadings and prepared with different methods in PDH reaction at 873 K under a WHSV of 2.4 h −1 after 1 h on stream 102. Copyright 2021, Elsevier.…”

The remarkable performance of a single iridium atom supported on hematite for methane activation: a density functional theory study

“…27 Furthermore, recent studies have described the role of single metal atom dopants in Al 2 O 3 and zeolites for the activity, selectivity, stability, and regeneration capability of catalysts in propane and light alkane dehydrogenation. [30][31][32] Previous studies have shown that the metal oxides doped with low-valence metal atoms show better catalytic activity towards methane activation than the nondoped oxides. [33][34][35] Compared with other metal oxides, hematite is abundant, inexpensive, and environmentally benign.…”