Mixed MgAl Oxide Supported Potassium Promoted Molybdenum Sulfide as a Selective Catalyst for Higher Alcohol Synthesis from Syngas

Abstract

A Mg/Al mixed metal oxide material (MMO) is introduced as a support for K 2 CO 3 promoted MoS 2 in CO hydrogenation reactions at 310°C and 1,500 psig. The catalyst is shown to be more selective for C 2 -C 4 linear alcohols (substantially so for C 3 -C 4 linear alcohols) than for methanol and offers good alcohol to hydrocarbon selectivity. Methanol selectivity of the MMO supported catalyst deviates greatly from the Anderson-Shultz-Flory distribution.

Catalytic oxidation of styrene over Cu-doped hydrotalcites

“…The overall activity is related to the copper content while the activity in the oxidation is correlated to the geometry and concentration of copper ions in a well-ordered two-dimensional lattice of hydrotalcite-like materials [24,26,30,51,56]. Thus, the textural feature of hydrotalcite is vital to the oxidation process and Cu 2+ ions stabilized at octahedral sites play as active sites for the selective oxidation although the synergistic interaction between copper ions and basic sites for the overall oxidation process are not ruled out.…”

“…EDS spectra of three representative specimens shown in Figure 3 clearly indicate the presence of all components [16,30]. The atomic percent of the elements are reported in Table 2S ( Table 2S) [34].…”

“…In other context, TEM image of Mg-Cu-Al likehydrotalcite sample of TH02 presents laminar structure which is essentially characteristic for hydrotalcite mineral and the stacking of the layers (Fig. 6) [16,30,31]. The flat particles with hexagonal shapes are presented and the grain boundaries are clearly observed.…”

“…A small difference in the initial ratios of cations between starting materials and the copper-richer solids (x > 0.28) is probably due to the different solubility products of ionic solids at a constant pH during the precipitation course [28,30,[32][33][34][35].…”

“…In essence, isomorphous substitution of transition metal ions in a brucite-like lattice leads to the appearance of oxidation-reduction centers in the sheets which may acts as active sites for the catalytic oxidation reaction [16,[25][26][27][28]. In earlier work, we have successfully modified the hydrotalcite composition as well as hydrotalcite-derived oxides as catalysts for the catalytic applications [16,30,31]. A synergetic interaction between transition metal-doped element and the hosting cations in the hydrotalcite lattice gives a great catalytic property in the oxidation and combination reaction [7,16,24,28,32].…”