Preparation method of Pentasil-type molecular sieve for preparing ethylene from ethanol

Abstract

The invention belongs to the field of catalysts, and particularly relates to a preparation method of a Pentasil-type molecular sieve for preparing ethylene from ethanol. The silica-alumina ratio of the molecular sieve is 60-800. The preparation method comprises the following steps: 1, mixing an aluminum source and a template agent, and evenly stirring to obtain slurry A; 2, adding a silicon source and an organic additive into the slurry A while stirring, and stirring to obtain gel B; and 3, further stirring the gel B at 25-90 DEG C for 2-10 hours, and then crystallizing at 100-210 DEG C for 12-60 hours, wherein the mol ratio of Al2O3, SiO2, H2O, the template agent and the additive among the raw materials is (0.001-0.017):1:(10-30):(0.05-1.6):(0.2-8). The molecular sieve provided by the invention has the characteristics of high hydrothermal stability, adjustable silica-alumina ratio, high dispersivity and the like, can be used for ethylene preparation reaction based on dehydration of a low-concentration ethanol solution, and is low in reaction temperature and high in catalyst activity and selectivity.

Description

technical field [0001] The invention relates to a catalyst in the field of chemical industry, in particular to a method for preparing ethylene Pentasil molecular sieves from ethanol. [0002] Background technique [0003] Ethylene is an important petrochemical basic raw material, which can be used to produce a variety of important organic chemical raw materials. However, due to the shortage of oil supply, the rise of crude oil price and the environmental problems caused by the traditional oil route to produce ethylene, the non-traditional oil route to produce ethylene will have a great market prospect. The vigorous development of the bioethanol industry just caters to this need. At the same time, with the maturity of bioethanol technology, the cost of bioethanol continues to decrease, making the process of ethanol production of ethylene more economically advantageous. [0004] At present, the catalysts used in ethanol to ethylene are mainly modified alumina catalysts. The...

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Problems solved by technology

From the above two inventions, although the use of molecular sieves as catalysts is superior to alumina catalysts, a large amount of diluent gas is still required, and the reaction temperature is still relatively high