Comparison of the surface reactivity and bulk properties of ZnO and ZrO2: supports for CO hydrogenation catalysts

✍ Scribed by M.A.M. Luengo; P.A. Sermon; Y. Sun; M.S.W. Vong; V.A. Self

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 312 KB
• Volume: 101-103
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(97)00167-7

✦ Synopsis

ZnO and ZrO, has been produced under basic conditions. Hydrozincite, precipitated from a zinc acetate solution under alkaline conditions (after drying and calcination) transformed to ZnO,. This oxygen-deficient solid only reduced marginally in 5 kPa H, at a maximum rate at 770 K, as confirmed by a ZnzP,3,z, binding energy decrease. It adsorbed CO and even more extensively CO,. This ZnO,, adsorbs pyridine equally on Lewis acid sites (LAS) and Bronsted acid sites (BAS) and promotes CO hydrogenation at 523 K to methanol to the extent of 61.9 nmol/m'/min. ZrO, amorphous aerogels and crystalline xerogels adsorbed pyridine more in a H-bound state and promoted CO hydrogenation more to propan-2-01 at 523 K. The reasons for this surface reactivity are sought in terms of LAS-BAS concentrations and the potential of aerogel routes to ZnO are considered.