Honeycomb-shaped Pt Sn Na/y-Al2O3/cordierite monolithic catalyst with improved stability and selectivity for propane dehydrogenation

novel honeycomb-shaped Pt Sn Na/g-Al2 O3/cordierite monolithic catalyst（Pt 0.5%, Sn 0.9%, Na 1.0%,relative to Al2 O3 weight） was developed and its catalytic performances in propane dehydrogenation were tested and compared with the classical granule catalyst with same Pt, Sn and Na contents under the conditions of 0.1 MPa, 590C, C3 H8/H2 at 3/1（molar ratio） and gas hourly space velocity（GHSV） at155 h-1. Interestingly, despite the generated coke amount and exposed Pt fraction, the honey combshaped structure of monolithic catalyst exerted important influences on its catalytic activities and led to the advanced catalytic performances over the granule catalyst.

Catalytic dehydrogenation of propane to propylene over highly active PtSnNa/γ-Al2O3 catalyst

PtSnNa/γ-Al2O3 catalyst is widely used in the dehydrogenation of light alkane. This paper reports a new fabrication method of the catalyst. In the work, γ-Al2O3, SnCl4 and NaCl were ball milled to upload Sn and Na＋ onto the support instead of the conventionally used immersion method. The subsequent baking procedures frimly fixed Sn onto the support, which could disperse Pt introduced by immersion. The effects of Sn and Na＋ additives on the catalytic performance of PtSnNa/y-Al2O3 catalyst were investigated. It was found that the appropriate molar ratio of Sn/Pt was 6：1 while the favorable weight percentage of Na＋ was 0.90%. Compared with the reaction catalyzed by the industrially employed PtSnNa/ γ-Al2O3 catalyst, the conversion of propane and the selectivity of propylene had been greatly improved, which were 26.97%; and 99.18% respectivelv after 12 h reaction.