Propane Dehydrogenation Over PtSn Catalysts Supported on ZnO-Modified MgAl2O4

Abstract

Platinum and tin supported on ZnO-modified MgAl 2 O 4 constitutes a new and efficient catalyst for the dehydrogenation of propane. The structure of the catalyst has been studied by XRD, TEM, BET, TG, H 2 -TPR and H 2 chemisorption and catalytic properties for propane dehydrogenation have been tested on a microreactor. It has been shown that the catalyst is superior to conventional aluminasupported PtSn systems and PtSn/MgAl 2 O 4 in terms of lifetime stability, activity and propene selectivity. The characterization results of catalysts revealed that ZnOmodified catalysts can increase the Pt dispersion and enhance the interaction between metal and support, resulting in the increase of catalytic activity for propane dehydrogenation.

Influence of Oxygen Mobility over Supported Pt Catalysts on Combustion Temperature of Coke Generated in Propane Dehydrogenation

“…Although many efforts have been made to modify Pt-supported catalysts, deactivation due to coking is still not completely overcome, and catalysts must undergo continuous or frequent regeneration processes to restore the catalytic activity [4][5][6][7][8][9][10].…”

Zinc influence on the formation and properties of Pt/Mg(Zn)AlO catalysts synthesized from layered hydroxides

“…The effect of zinc introduction into the structure of LDH and, accordingly, into the oxide supports on their basic properties was studied using the adsorption of CO 2 [64,65]. As follows from data in Fig.…”

“…Conditions of the catalyst pretreatment included calcination in air at 823 K and reduction in flowing hydrogen at 823 K. The time of each experiment was 5 h. The composition of products was analyzed online using a Khromos GH-1000 gas chromatograph equipped with an Rt-Alumina PLOT column (the length of 50 m) and a flame ionization detector. Deactivation parameters (DP) of catalysts [64] were calculated by the formula DP = (x init À x fin ) Á 100%/x init , where x init and x fin are propane conversions after 0.5 and 5 h of the reaction.…”

“…Tin and platinum are supposed to form bimetallic alloys of different composition, which ensure the dissociative adsorption of alkanes and diminish the adsorption of alkenes as the target products. Platinum-tin catalysts can be synthesized also with SiO 2 , zeolites [29,30] and stoichiometric spinels [31][32][33] as the supports; such catalysts are employed in dehydrogenation of light alkanes, oxidation of CO, and selective hydrogenation of the carbonyl group in unsaturated aldehydes [34][35][36][37][38][39]. Platinum-tin composites supported on mixed oxides made from magnesiumaluminum LDH are also known.…”

Hierarchical MgAl2O4 supported Pt-Sn as a highly thermostable catalyst for propane dehydrogenation

“…Numerous research work has been reported to testify the high performance of this kind of material using as the dehydrogenation catalyst support [9][10][11]. But the thermal stability of these catalysts is seldom concerned.…”