Lanthanum-phosphorus double-heteroatom ZSM-5 molecular sieve catalyst and preparation method thereof

Abstract

The invention relates to a lanthanum-phosphorus double-heteroatom ZSM-5 molecular sieve catalyst and a preparation method thereof. The catalyst comprises the following components in percentage by mass: 55.50-62.00 percent of SiO2, 37.00-43.50 percent of Al2O3, 0.5-1.0 percent of P2O5 and 0.5-1.0 percent of La2O3. The preparation method comprises the following steps of: preparing a silicon source, a sodium salt and deionized water into a solution A; preparing an aluminum source, an acid and deionized water into a solution B; preparing phosphoric acid and deionized water into a solution C; and preparing a lanthanum source and deionized water into a solution D; dropwise adding the solution B into the solution A, adding an organic amine template, adding the solution C and the solution D in sequence, stirring uniformly, transferring into a synthesis kettle, sealing, aging, crystalizing, cooling to obtain a lanthanum-phosphorus double-heteroatom ZSM-5 molecular sieve, performing ion exchange by using an inorganic acid, adding a molecular sieve bonding agent, mixing uniformly with nitric acid, performing extrusion forming, drying and baking to obtain a product. Compared with the prior art, the molecular sieve has the advantage that methanol can be transformed into a light olefin at high selectivity, and particularly into a propylene product at high selectivity.

Description

technical field [0001] The invention relates to a catalyst, in particular to a lanthanum and phosphorus double heteroatom ZSM-5 molecular sieve catalyst and a preparation method thereof. Background technique [0002] Ethylene and propylene are important organic chemical intermediate raw materials. With the rapid growth of the national economy, especially the increasing demand for low-carbon olefins in the development of the chemical industry, the production of ethylene and propylene urgently needs new alternative processes, (“Chemical Industry and Engineering Technology" No1, Vol33, 2012). So far, ethylene and propylene are still obtained through catalytic cracking and cracking of naphtha and light oil from petroleum. my country's oil self-sufficiency rate is low, imports are increasing year by year, and foreign dependence is increasing year by year. However, the production of ethylene and propylene still uses the existing raw materials and technical routes. As a result, th...

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Problems solved by technology

The molecular sieve catalyst modification technology provided by this patent also has defects such as complicated process flow and high energy consumption for preparation.

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