Incorporation of cations into zeolites by a new reaction between Brönsted acid zeolites and metals. I. Zinc into faujasites and mordenites

Preparation of Gallium‐Containing Catalysts by Solid‐State Reaction of Acidic Zeolites with Elemental Gallium

“…Zeolite H-Y was exposed to vapors of elemental cadmium or zinc at 330 to 420 C for several hours. Essentially the same reaction was observed later by Beyer et al [11] upon heating a physical mixture of zeolite NH 4 -Y and zinc powder: Between 400 and 450 C, hydrogen was formed. At the same time, the amount of Brùnsted acid sites decreased and the reflections of elemental zinc in the X-ray powder diffraction pattern disappeared.…”

“…At the same time, the amount of Brùnsted acid sites decreased and the reflections of elemental zinc in the X-ray powder diffraction pattern disappeared. The same reaction was shown to occur with NH 4 -mordenite [11] or H-ZSM-5 [12]. Very recently, Hagen et al [13,14] expanded the solidstate reaction to various kinds of proton-containing supports (zeolite ZSM-5 and zeolite Y, silica and c-alumina) and low-melting (non-noble) metals such as Zn, Mg, Mn, Fe and Ga, with a focus on the zinc-containing systems.…”

1H and 13C MAS NMR studies of light alkanes activation over MFI zeolite modified by Zn vapour

“…Therefore in this contribution we applied in situ 1 H and 13 cations or ZnO species we used the procedure proposed by Peapples-Montgomery [11]. This procedure is based on redox reaction between H-form of a zeolite and metallic zinc leading to formation of gaseous hydrogen and fully exchanged zeolite.…”

Modification of acid supports by solid-state redox reactionPart I. Preparation and characterization

“…This reaction can be regarded as the solid-state analogue to the dissolving of zinc oxide in liquid acids. Further, the solid-state reaction between metallic zinc and various zeolites, (2) Zn + 2H-zeolite → Zn 2+ -(zeolite) 2 + H 2 , came into focus [15][16][17][18] as an alternative reaction. Also this reaction has its counterpart in solution.…”

“…As a result of their studies of the system zinc plus ammonium mordenite and Y zeolite, Beyer et al [17] emphasized the possibilities of this reaction for the characterization of the number as well as strength of Brønsted acid sites in zeolites. This is possible, because zinc reacts with the entire number of Brønsted acid sites.…”