Isomerization of n-heptane on Pt/MOR/Al2O3 catalysts

Abstract

Pt/MOR/Al 2 O 3 catalysts with mordenite zeolite contents of 10 to 50 wt % are prepared. Solutions of H 2 PtCl 6 and [Pt(NH 3 ) 4 ]Cl 2 are used as precursors of Pt. It is shown by means of transmission electron microscopy (TEM) that the localization of platinum on a MOR/Al 2 O 3 mixed support depends directly on the nature of the metal's precursor. The catalysts are tested in the isomerization of n heptane. It is shown that the best samples of catalysts provide yields of the target products (dimethyl and trimethyl substituted isomers of heptanes) on the level of 21 wt % at a temperature of 280°C, while those of a C 5+ stable catalyzate are on the level of 79-82 wt %. The catalysts can be used to improve the environmental friendliness of gasolines by employing them in the isomerization of the 70-105°C fraction of directly distilled gasoline.

Catalytic upgrading of vegetable oils into jet fuels range hydrocarbons using heterogeneous catalysts: A review

“…Incorporation of Al 2 O 3 support into the zeolite structure can also influences the activity of a 0.3 wt.%Pt/H-MOR catalyst [129]. It could be observed that, for a 10 to 50 wt.% alumina additions, the higher the alumina loading the higher the n-heptane conversion.…”

Catalytic Activity of Pt Loaded Zeolites for Hydroisomerization of n-Hexane Using Supercritical CO2

“…Therefore, several metal species including Pd, Ga, Ni, Ir, Zn, Fe, Mo, Co, Cu, Ru, Zr, and Pt were loaded on the zeolite framework for better stability, selectivity, and activity by different methods including the impregnated and supercritical CO 2 . ,, Among them, platinum (Pt) is known as an extremely effective metal for dehydrogenation and hydrogenation reactions. Pt loading over the zeolites increased the bifunctionality of catalysts by modifying the acidic active sites and formation of redox sites that are considered as highly effective and stable for n -C 5 –C 6 –C 7 alkanes hydroisomerization. − Yeh et al demonstrated that loading of Pt over ZSM-5 (Pt/ZSM-5) by the impregnated method showed 9.8% and 9.2% n -hexane conversion at 633 and 723 K respectively with 137 bar constant pressure. They also revealed that Pt/ZSM-5 resulted in the maximum yield of about 12.5 and 8.9% for iso -C 6 isomers with an average 9.2% production of the cracked product at the same temperature and pressure.…”

Deparaffinization of middle petroleum distillates in the presence of modified zeolite-based catalysts

“…Все это обусловливает необходимость разработки высокоэффективных катализаторов без благородных металлов, позволяющих осуществлять процесс риформинга в принципиально новых условиях без присутствия газообразного водорода. В настоящее время в промышленности для изомеризации пентан-гексановых фракций применяются хлорированный Pt/Al 2 O 3 и Ptцеолитный катализатор на основе морденита [9]…”