Influence of support on the catalytic properties of Pt–Sn–K/θ-Al₂O₃ for propane dehydrogenation

Abstract

The correlation between the physicochemical parameters of the catalysts and the dehydrogenation performance of propane was established.

The Effect of Mg and Zn Dopants on Pt/Al2O3 for the Dehydrogenation of Perhydrodibenzyltoluene

“…The elemental line scan in Figure 6 shows high Pt distribution throughout the Mg-doped catalyst (not an eggshell type) as opposed to the surface dispersion of Pt shown in Table 3. [33][34][35][36]. Values for the acidity of supports and catalysts, determined by NH 3 -TPD, are tabulated in Table 4.…”

Effect of Reduction of Pt–Sn/α-Al2O3 on Catalytic Dehydrogenation of Mixed-Paraffin Feed

“…et al [30]. Generally, the metallic state of Sn acts as a poisoning agent and Sn(II.IV) serves as promotor in the catalyst [1,33].…”

“…The temperature programmed oxidation profile (TPO) based on the coke removal rate is presented in Figure 8c for the NaBH 4 reduced catalyst and Figure 8d for the hydrogen reduced catalyst. It was reported that the complete combustion of coke will happen under 400 • C in air atmosphere [1]. From Figure 8a,b, it can be noted that the complete combustion of coke deposited on both catalysts happened below 400 • C. Only one peak was observed during the differential thermal analysis of both spent catalysts, as shown in Figure 8c,d, between 200 • C and 320 • C. The exothermic peak between 200 • C and 320 • C represents the carbon deposition on the metal surface, which is the result of the catalyzing effect of metal towards oxidation of coke deposited on it [13,25,34].…”

“…In daily life, olefins like propylene, butylene, and butadiene are the main building blocks for the production of high demand chemicals and polymers such as propylene oxide, cumene, acrylonitrile, isopropyl alcohol, polypropylene, and polybutadiene [1,2]. The demand for olefins is expected to increase at a rate of 3.7% annually [3].…”

“…Paraffin dehydrogenation is a highly endothermic reaction that is limited by thermodynamic equilibrium. The individual paraffin dehydrogenation reactions along with the standard enthalpy of the reaction are given in Equations (1) and (2). These reactions are generally carried out at high temperatures (550-700 • C) and low pressure using different catalysts like noble metals (Pt, Cr, Ir, Rh, V, Pd) and their oxides [2,10,11].…”