Metal‐reinforced sulfonic‐acid‐modified zirconia for the removal of trace olefins from aromatics

Abstract

Metal-reinforced sulfonic-acid-modified zirconia catalysts were successfully prepared and used to remove trace olefins from aromatics in a fixed-bed reactor. Catalysts were characterized by ICP-OES, N 2 adsorption-desorption, X-ray diffraction, thermogravimetric analysis (TGA), and pyridine-FTIR spectroscopy. Different metals and calcination temperatures had great influence on the catalytic activity. Alumina-reinforced sulfated zirconia exhibited outstanding catalytic performance, stable regeneration activity, and giant surface area, and are promising in industrial catalysis. TGA showed that the decomposition of methyl could be attributed to Brønsted acid sites, and pyridine-FTIR spectroscopy proved the weak Brønsted sites on these synthesized metal-reinforced sulfated zirconia. Also, a relation between the reaction rate and weak Brønsted acid density is proposed.

Catalytic performance and industrial test of HY zeolite for alkylation of naphthalene and α-tetradecene

“…Zirconia precursor was prepared according to Kong's method. 21 The Zr(OH) 4 precursor was impregnated with 2 mol L À1 sulfuric acid solution for 2 h, filtered, dried in an oven at 120 1C, and calcined at 650 1C for 3 h. The obtained catalyst was broken into 20-40 mesh particles for fixed bed reaction.…”