Preparation of Highly Active Alumina-Pillared Clay Montmorillonite-Supported Platinum Catalyst for Hydrodesulfurization

Abstract

Effect of Pt precursor and pretreatment on hydrodesulfurization (HDS) activity of Pt/Al-PILM catalyst was examined to prepare highly active Pt-supported HDS catalyst. The order of HDS activities of Pt/aluminapillared clay montmorillonite (Al-PILM) catalysts prepared by various Pt precursors was Pt (C 5 6 . This order was in accordance with that of Pt dispersion. Thus, high Pt dispersion is essential factor to prepare highly active Pt/Al-PILM catalyst for HDS reaction. On the other hand, the effect of pretreatment on the HDS activities of Pt/Al-PILM catalysts prepared by various Pt precursors was also evaluated. The UC-TPS Pt/Al-PILM catalyst showed the highest HDS activity among various pretreated Pt/Al-PILM catalysts, in which uncalcined catalyst was sulfided by temperature programmed sulfidation (TPS). We assumed that high HDS activity of UC-TPS Pt/Al-PILM catalyst is caused by partly sulfided Pt particle with high dispersion. It is concluded that the highly active Pt/Al-PILM catalyst for the HDS reaction could be prepared by using Pt(C 5 H 7 O 2 ) 2 as a precursor and UC-TPS treatment.

Noble Metal Phosphides as New Hydrotreating Catalysts: Highly Active Rhodium Phosphide Catalyst

“…Recently, we reported that noble metal (NM), especially Pt, catalysts showed high and stable HDS activities 47) 53) . We proposed two reaction mechanisms for the HDS reaction: the monofunctional route occurring on Pt particles, and the bifunctional route occurring on Pt and Brønsted acid sites 47) 53) .…”

“…We proposed two reaction mechanisms for the HDS reaction: the monofunctional route occurring on Pt particles, and the bifunctional route occurring on Pt and Brønsted acid sites 47) 53) . Therefore, noble metal phosphide catalyst, which has moderate hydrogenation activity, can be expected to show high HDS and HDN activities.…”

Preparation and performance of noble metal phosphides supported on silica as new hydrodesulfurization catalysts

“…Especially, phosphat e salt s were widel y used as phosphorous source. Bussel et al [10] and Lee and Oyama et al [11] report ed t hat Ni 2 P cat alyst s support ed on silica (S iO 2 ) showed higher HDS act ivit y t han NiMo/ Al 2 O 3 cat alyst s. Thus, S iO 2 is a super ior support for preparat ion o f highly act ive phosphide cat alyst s. On t he ot her hand, we have report ed t hat noble met al (NM), especially plat inum (Pt ), support ed on zeo lit es [22 -24] and relat ed mat er ials, such as mesoporous silicat es [25 -27] and clays [24,28], showed high and st able act ivit y in HDS o f t hiophene. Thus, it is expect ed t hat noble met a l phosphides (NM X P Y ) show high cat alyt ic act ivit ies for HDS react ion, but HDS act ivit ies o f NM X P Y have not been report ed.…”

C−H and C−S Activations of Quinoline-Functionalized Thiophenes by Platinum Complexes

“…C−S activation of thiophene has been proposed to be a key step in the HDS process. Group 10 metal complexes were proved to be feasible catalysts in the HDS process recently, , and the model studies generally involved active zero-oxidation-state metal species prior to C−S cleavage, in which thiophene was coordinating in a η 2 -fashion, as suggested by recent DFT calculations. , A platinum(II) complex of η 2 -thiophene was also proposed as an intermediate in a C−S activation reaction, in which a cationic Pt(II) hydride complex was used as a starting material . Attempts to activate the C−S bond directly from 2 and 2′ and to force 2′ to undergo reductive elimination to form a platinum(0) species for C−S activation were unsuccessful, which prompted us to explore other platinum starting materials for C−S activation.…”