Isobutane/2-butene alkylation over faujasite type zeolites in a slurry reactor. Effect of operating conditions and catalyst regeneration

Direct Identification of Zeolite Beta Polymorphs by Solid-State 29Si Nuclear Magnetic Resonance Spectroscopy

“…The minimal differences in the structure of polymorphs often result in a remarkable difference in their physicochemical and catalytic properties. The example can be given by the improved catalytic activity and stability in hydrocarbon cracking and alkylation of the EMT zeolite compared to FAU , or chiral properties of polymorph A of zeolite beta compared to completely achiral polymorph B. , The unraveling of the exact structure of the individual polymorphs and their contribution to the overall structure of intergrown zeolitic materials is a big challenge for understanding their physicochemical and catalytic properties and, therefore, for the rational design of highly efficient adsorbents and catalysts.…”

Hydrogenative regeneration of a Pt/La-Y zeolite catalyst deactivated in the isobutane/n-butene alkylation

“…Almost identical compositions of the isooctane fraction during isobutane/n-butene alkylation at ca. 80 8C were found earlier by Weitkamp [9] and Rørvik et al [30] on Ce-Y zeolite catalysts and by Kirsch et al on a RE-Y zeolite catalyst [31]. Light ends (C 5 -C 7 ) are formed with a mass fraction around 10 wt.% (cf.…”

Preparation of CuHY catalyst via solid-state ion exchange method and its catalytic performance in isobutane/2-butene alkylation

“…16,17,28 With higher I/O ratio, the olen concentration around the catalytic center is lower, inhibiting the further reaction of alkyl carbocations with other olens which forms undesired heavier products. [29][30][31] There are many advantages of increasing the I/O ratio, but this is mainly achieved by enhancing the I/O ratio in feed and the recycle of isobutane is inevitable, which largely increases operating cost. Additionally, the local I/O ratio around the acid sites is signicantly lower than that of the feed at the reactor inlet due to the stronger adsorption capacity of zeolite for olens than paraffins.…”