Preparation and applications of platinum-based framework iron molecular sieve alkane dehydrogenation catalyst

Abstract

The invention discloses preparation and applications of a platinum-based framework iron molecular sieve alkane dehydrogenation catalyst. The method comprises the following steps: respectively preparing a tetraethyl orthosilicate solution and a template agent tetrapropylammonium hydroxide solution according to a certain ratio, mixing to obtain a mixed solution, putting an iron salt into the mixed solution, and violently stirring at room temperature until the iron salt and the mixed solution are completely mixed; putting the mixed solution into a hydrothermal reaction kettle, and crystallizing in a drying oven; centrifuging and washing the crystallized sample, drying the washed sample in a drying oven overnight, and roasting the dried sample in a muffle furnace at 400-500 DEG C; cooling to room temperature to obtain the framework iron molecular sieve carrier; adding a certain amount of a platinum solution into the carrier by adopting an ion exchange method, drying the mixed sample in a drying oven overnight, putting the sample into a tubular furnace, and heating at 400-500 DEG C in an air atmosphere; and carrying out hydrogen reduction on the obtained solid powder to obtain the platinum-based framework iron molecular sieve alkane dehydrogenation catalyst capable of being used for realizing high monoolefine selective dehydrogenation of alkane. The catalyst has the characteristicsof easily available raw materials, simple process, low cost and the like.

Description

technical field [0001] The invention relates to the preparation and application of a platinum-based skeleton iron molecular sieve alkane dehydrogenation catalyst, which is suitable for the dehydrogenation of normal alkanes and has the advantage of high monoolefin selectivity. Background technique [0002] Alkenes refer to hydrocarbons containing C=C bonds (carbon-carbon double bonds) (olefinic bonds). Belonging to unsaturated hydrocarbons, olefins are divided into alkenes and cycloolefins, which are mono-olefins and diolefins according to the number of double bonds. Alkenes can be prepared by the reaction of haloalkane with sodium hydroxide alcohol solution, or by the dehydration of alcohol or by the reaction of o-dihaloalkane with zinc. The small molecule olefins mainly come from petroleum cracking gas. Alkenes are important basic raw materials in organic synthesis. [0003] Alkylbenzene sulfonate prepared from alkylbenzene is a typical anionic surfactant, which is an im...

AI Technical Summary

Problems solved by technology

Unmodified aluminum-supported platinum catalysts have relatively high activity but poor selectivity to monoolefins when applied to dehydrogenation reactions

Images