Structural recognition and preorganization in zeolite catalysis: Direct aromatization of n-hexane on zeolite L-based catalysts

Selective Production of Aromatics from 2-Octanol on Zinc Ion-Exchanged MFI Zeolite Catalysts

“…Importantly, the catalytic activity of K-LTL for aromatization was greatly improved by the addition of platinum as shown in Figure 2, which corresponded to reports that the Pt-K-LTL was active for the aromatization of long-chain hydrocarbons [23][24][25][26][27][28]. Namely, the dehydration of 2-octanol to 2-octene and the aromatization of the resulting 2-octene were well catalyzed with the acid sites on the LTL zeolite and the loaded Pt, respectively.…”

“…The selectivity of aromatics on zeolite catalysts was the highest among those on reported catalysts due to the shape selectivity [13][14][15][16][17][18][19][20][21]. Platinum-loaded K-LTL zeolites were reported as highly active catalysts for the aromatization of n-hexane [23][24][25][26][27][28]. In addition, proton and metal ion-exchanged MFI zeolites exhibited high activity for the formation of gasoline from various alcohols [7].…”

Pt clusters in BaKL zeolite: Characterization by transmission electron microscopy, hydrogen chemisorption, and X-ray absorption spectroscopy

“…The reported work raises fundamental questions about the size and electronic structure of the metal clusters, the nature of the metal-zeolite interactions, and the origin of the catalytic selectivity. Some authors [6,7] have attributed the remarkable selectivity to a property of the narrow zeolite pores, but electronic effects may play a role [8], and particle size effects should not be ruled out.…”

“…The sample consequently offers a unique set of opportunities for resolving some fundamental issues in catalysis by supported metals. Specifically, further data for this catalyst are expected to provide an elucidation of the role of the narrow zeolite pores, in contrast to the size and electronic structure of the small platinum clusters (which are too small to fill the zeolite cage) in accounting for the selectivity of this catalyst [6,7]. Further, on the basis of the precise structural characterization of the sample the platinum d-band density of states can now be determined from the white line intensities from the platinum L n and Lni X-ray absorption edges.…”

Synthesis of nanosized ZSM‐5 using different alumina sources

“…Fraenkel et al [6] have expanded this concept to include reactions occurring near or on the zeolite surface. Additionally, Derouane and coworkers [7][8][9] proposed that each zeolite structure has a specific outer surface configuration that offers optimal interactions with adsorbed molecules. According to the relevant role of surface area in the catalytic behavior, zeolites with small crystal size should be advantageous.…”