Effect of the different modifications of A1PO-5 molecular sieve on its acidity and catalytic properties in methanol conversion to hydrocarbons

Abstract

An A1PO-5 molecular sieve has been isomorphously substituted by one (Co or Si) or two (Co and Si) elements and studied in the catalytic conversion of methanol to hydrocarbons. The effect of different modifications on both acidity and catalytic behavior of this material was established and further discussed.

A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction

“…In an analogous study of H‐SAPO‐5 and H‐CoAlPO‐5, Popova et al. reported that the initial conversion of MeOH was similar over H‐CoAlPO‐5 and H‐SAPO‐5 at 450 °C …”

“…In an analogouss tudy of H-SAPO-5 and H-CoAlPO-5, Popova et al reported that the initial conversion of MeOH was similar over H-CoAlPO-5and H-SAPO-5at4 50 8C. [49] In the presentc ontribution, the Brønsted acidic H-MAlPO-5 materials were designed to span as pectrum of acid strengths coveringt he high, medium, and lowv alues [32] while keeping properties such as particle size and morphology and density of acid sites maximally similar to ad egree allowed by the synthetic procedure. The choice of the substituting elements was strongly influenced by the work of Brogaard and Wang et al, who used ammonia adsorption enthalpy as an acidity descriptor;t hey established ar anking of the materials that correlated with rates of propene methylation.…”