Deep Hydrogenation Saturation of Naphthalene Facilitated by Enhanced Adsorption of the Reactants on Micro‐Mesoporous Pd/HY

Abstract

Deep hydrogenation saturation of polycyclic aromatic hydrocarbons is of great importance for the production of valuable chemical products, but is hard due to the presence of hardly broken π bond. In this work, micro-mesoporous HY supported Pd catalysts (Pd/HY-a) have been prepared by a simple impregnation method following alkali treatment of pristine HY zeolite, which exhibited superior performance for the deep hydrogenation saturation of naphthalene. Pd/HY-a was systematically characterized and compared with the Pd catalysts supported on pristine HY, ZSM-5, SBA-15, and Al 2 O 3 . In Pd/HY-a, abundant mesoporous pore channels together with suitable B acid sites greatly facilitate the adsorption of the reactants (naphthalene and tetralin) and properly tune the electron state of loaded Pd. Therefore, efficient deep hydrogenation saturation of naphthalene has been achieved on Pd/HY-a. Moreover, the kinetic behaviors of naphthalene hydrogenation on Pd/HYa were preliminarily investigated, in which the first-order kinetic model fitted the experimental data well in the early reaction stage.

Thioresistant PdPt/Al/SBA-15 for Naphthalene Hydrogenation

“…It is worth noting that the latter possessed protonic acid sites (from Al–O–Si linkages, see Table S2) that could contribute to enhanced activity. Indeed, the additional contribution from metal–support interfacial sites to aromatic saturation has been proposed in the past. , Thus, aromatic molecules could be adsorbed on those acid sites, being then able to react with hydrogen spilt over from NM particles . Both PdPt/Al/SBA-15 formulations had similar low activity as that of the Pd-alone solid, strongly supporting the notion of Pt–Pd core–shell NM particles producing a “diluting” effect of otherwise highly active platinum.…”

“…38,69 Thus, aromatic molecules could be adsorbed on those acid sites, being then able to react with hydrogen spilt over from NM particles. 70 Both PdPt/Al/SBA-15 formulations had similar low activity as that of the Pd-alone solid, strongly supporting the notion of Pt−Pd core−shell NM particles producing a "diluting" effect of otherwise highly active platinum. Regarding TOF 1 values (Table 3), they also pointed out to a palladium-rich surface as, in spite of the higher dispersion compared to that of Pd/Al/SBA-15 (Table 2), the binary formulation had low activity per site.…”

Selective Hydrogenation of Naphthalene to Decalin Over Surface‐Engineered α‐MoC Based on Synergy between Pd Doping and Mo Vacancy Generation

“…Traditional hydrogenation catalysts based on Pt group metals (e.g., Pt, Pd, and Ru) [12][13][14][15][16][17][18][19][20] offer the benefits of comparatively mild operation conditions, high selectivity, high efficiency, and excellent stability but are costly, which has inspired the development of cheaper yet efficient alternatives. The selection of a suitable support was found to be important for improving catalytic performance at reduced noble metal loadings.…”