Synthesis of exo-tricyclopentadiene from endo-dicyclopentadiene over mesoporous aluminosilicate catalysts prepared from Y zeolite

You, Yongin; Park, Youri; Han, Jinyu; Kwon, Tae Soo; Seo, Donguk; Seong, Minjun; Jeon, Jong‐Ki

doi:10.1007/s11814-018-0177-7

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“…The pyridine-FTIR spectra, obtained by adsorbing pyridine on the Pt/HZSM-48 catalyst and then raising the temperature in a vacuum, show that the three peaks at 1450, 1492 and 1545 cm −1 did not decrease notably even when the desorption temperature was raised to 300 • C ( Figure 7). The peaks at 1450 and 1545 cm −1 correspond to Lewis acid sites and Brönsted acid sites, respectively [27,28]. The peak shown at 1492 cm −1 is known to be a peak at the Brönsted acid sites and Lewis acid sites, simultaneously.…”

Section: Characterization Of Catalystsmentioning

confidence: 98%

Ring Enlargement of Methylcyclopentane over Pt/(HZSM-48+pseudoboehmite) Catalysts

Park

Kim

et al. 2019

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Platinum catalysts loaded on a hybrid support, composed of HZSM-48 and pseudoboehmite, were applied to the synthesis of benzene through methylcyclopentane (MCP) reforming in order to investigate the effect of the addition of pseudoboehmite to Pt/HZSM-48 for ring-enlargement reaction. A total of 0.5 wt% of platinum was impregnated on the hybrid support by using the incipient wetness method. Catalyst characterization was performed with nitrogen sorption, X-ray diffraction, temperature-programmed desorption of NH3, and infrared spectroscopy of adsorbed pyridine. It was found that mesoporous structures were well-developed in Pt/(HZSM-48 + pseudoboehmite) catalyst as a result of the pseudoboehmite addition, of which the average pore size was in the range of 7–8 nm. The presence of pseudoboehmite in the catalyst increases the total amount of acid sites and weakens the acid strength, compared with those of the Pt/HZSM-48 catalyst. Lewis acid sites were more abundant than Brönsted acid sites over the Pt/(HZSM-48+pseudoboehmite) catalysts. It was found that selectivity to the ring-enlargement reaction is dominant over selectivity to the ring-opening reaction over the Pt/(HZSM-48 + pseudoboehmite) catalysts. The benzene yield over Pt/(HZSM-48 + pseudoboehmite, 1:1) catalyst reached 65.1% at 450 °C and 0.3 h−1. As well as being influenced by the mesoporous structure, the higher activity and selectivity in MCP reforming was also determined by appropriate acidity of the Pt/(HZSM-48 + pseudoboehmite) catalysts.

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Section: Characterization Of Catalystsmentioning

confidence: 98%