Co-Aromatization of n-Butane and Methanol over PtSnK-Mo/ZSM-5 Zeolite Catalysts: The Promotion Effect of Ball-Milling

Abstract

The ball-milling (BM) method benefits the stabilization and dispersion of metallic particles for the preparation of the PtSnK–Mo/ZSM-5 catalyst. Based on the TPR, H2-TPD, XPS, and CO-FTIR results, the Pt–SnOx and MoOx species were formed separately on the BM sample. During the aromatization of cofeeding the n-butane with methanol, the yield of the aromatics is 59 wt.% at a n-butane conversion of 86% at 475 °C over the Pt Mo BM catalyst. The more weak acid sites also contribute to the aromatics formation with the less light alkanes formation. For the Pt Ga catalysts, the slow loss of activity suggests that the BM method can restrain the coke deposition on the Pt-SnOx species, because of a certain distance between the Pt–SnOx and GaOx species on the surface of ZSM-5.

Enhanced aromatics selectivity and stability in a coaromatization reaction over P/[ZnCr]/HZSM-5

“…At higher temperature, the cracking reaction of longer chain hydrocarbons was enhanced, which not only resulted in the increase of C 1 -C 2 compounds but also the decrease of C 4+ longer chain hydrocarbons. [13][14][15][16] The lower propane selectivity might also be due to the inhibition of the hydrogen transfer of propylene at higher temperatures. [17][18][19][20][21][22] It is worth pointing out that the enhanced cracking of polymethylbenzene and aromatization of hydrocarbons at higher temperature provided more aromatics.…”

Pt-based catalysts for NOx reduction from H2 combustion engines

“…S2 † was plotted to study the Pt 4d 5/2 spectra due to the overlapping Al 2p peak for the Pt 4f. According to the literature, 50 the signal at the higher binding energy (316.0-317.1 eV) can be assigned to the Pt 2+ ions, whereas the band at lower binding energy (314.3-315.5 eV) can be considered as Pt 0 species. Although the signal is weak, it can be used as an aid to demonstrate that the 1.0 wt% Pt/SSZ-13 catalyst indeed has more Pt particles in the metallic state.…”