Highly Efficient P-Modified HZSM-5 Catalyst for the Coupling Transformation of Methanol and 1-Butene to Propene

Abstract

A series of HZSM-5 zeolites modified by different amounts of phosphorus (P/HZSM-5) were prepared, and their catalytic performances for the coupling reaction of methanol and C4 hydrocarbons to light olefins were investigated. The results indicated that P/HZSM-5 is a highly efficient catalyst for the transformation of methanol and 1-butene to propene with low-energy consumption. At the temperature of 550 °C, the maximum yield of propene was achieved at 44.0%, which was 7.4 and 4.5% higher than those on 1-butene catalytic cracking and methanol to olefins (MTO), respectively. X-ray photoelectron spectroscopy (XPS) characterization on the catalyst showed that P bonds to the HZSM-5 zeolite framework through oxygen. The enhanced coupling performances can be correlated to the combined effects of matching of the co-feedings and the suitability of the P/HZSM-5 catalyst.