ZSM-5 zeolite catalyst for preparing propylene by methanol dehydration as well as preparation method and application thereof

A ZSM-5 and zeolite catalyst technology, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy fluctuation of product yield and poor stability, and achieve slow decay of methanol conversion rate and excellent performance Good recovery and long-lasting effect

Inactive Publication Date: 2011-05-18
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ZSM-5 zeolite catalyst prepared by using the binderless technology shows the advantages of high propylene selectivity and high propylene / ethylene ratio in the MTP reaction (patent disclosure CN101269340A), but the continuous catalytic reaction product yield is easy to fluctuate, Poor stability

Method used

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  • ZSM-5 zeolite catalyst for preparing propylene by methanol dehydration as well as preparation method and application thereof
  • ZSM-5 zeolite catalyst for preparing propylene by methanol dehydration as well as preparation method and application thereof
  • ZSM-5 zeolite catalyst for preparing propylene by methanol dehydration as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0045] Embodiment 1-9: the preparation of aluminum sol

[0046] The typical raw materials, proportions and preparation conditions used in the preparation of aluminum sol are shown in Table 1 below.

[0047] Table 1. Preparation of aluminum sol

[0048]

[0049]

[0050] The preparation process is as follows:

[0051] Taking Example 1 as an example, measure a certain volume of concentrated nitric acid, dilute it to a concentration of 4mol / L with deionized water, measure a certain volume of 4mol / L nitric acid solution and a three-necked bottle, weigh an aluminum sheet of corresponding weight, and cut it into 1cm Put small pieces of the same size into the nitric acid solution in the three-necked bottle, heat the oil bath to 60°C, and keep it under stirring for 12 hours.

Embodiment 10-17

[0052] Examples 10-17: Forming of Catalysts

[0053] The typical conditions for preparing shaped catalysts with aluminum sol as a binder are shown in Table 2 below:

[0054] Formation of table 2, catalyst

[0055]

[0056] The molding process is as follows:

[0057] Taking Example 10 as an example, the zeolite powder and additive starch are mixed uniformly, the binder in the proportion is added, and an appropriate amount of water is added, and the mixture is uniformly mixed and placed in a mechanical extruder for extrusion molding.

Embodiment 18

[0058] Embodiment 18: Catalyst preparation completes and performance analysis

[0059] The catalyst particles prepared in Example 11 were calcined in a muffle furnace at 550° C. for 6 hours to obtain the prepared catalyst.

[0060] The physical and chemical properties and catalytic performance of the prepared catalyst were analyzed, the results are as follows:

[0061] figure 1 is the XRD spectrum of the catalyst. It can be seen that the catalyst is a typical MFI structure type molecular sieve with high crystallinity, and its SiO 2 / Al 2 o 3 The ratio (SAR) was 5.82. There is no obvious characteristic diffraction peak of alumina, indicating that the aluminum sol exists in the zeolite material in a highly dispersed state after high-temperature calcination, and no other crystal structure is formed.

[0062] figure 2 for the catalyst 29 Si NMR spectrum. The coordination state of Si is mainly Si(0Al) and contains a small amount of Si(1Al). According to the calculation ...

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Abstract

The invention provides a ZSM-5 zeolite catalyst for preparing propylene by methanol dehydration, which contains a ZSM-5 zeolite material and alumina; the active ingredient of the catalyst is commercially available 200-800-nanomter ZSM-5 zeolite crystal powder, the framework of the catalyst has the Si / Al molar ratio being more than 500 and is prepared by means of bonding formation of aluminum sol, and aluminum is dispersed in zeolite powder amorphously after high temperature calcining. The catalyst which is applied to MTP (Methanol To Propylene) reaction has high catalytic activity and propylene selectivity and long stable cycle of high conversion rate of catalytic reaction. Industrial crude methanol with 90% concentration is used as a raw material for reaction, and the one-way life is more than 700 hours. The regenerative method of the ZSM-5 zeolite catalyst is simple and the performance recovery after regeneration is excellent. In addition, the invention provides a preparation method and application of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of material preparation and catalytic application, and in particular relates to a ZSM-5 zeolite catalyst for methanol dehydration to propylene (MTP) and a preparation method thereof. Background technique [0002] Zeolite molecular sieve is a kind of inorganic aluminosilicate crystal, which contains regular and orderly arranged molecular-sized pores (ca. 0.3-1.5nm) in the framework. It is used in industrial processes such as catalysis, adsorption separation and ion exchange. [0003] The ZSM-5 zeolite (MFI type) molecular sieve reported by Mobil in 1972 (US Patent No. 3702886, 1972) has a two-dimensional ten-membered ring channel (a ten-membered ring straight channel with a pore size of 0.54nm×0.56nm and ten-membered Ring sinusoidal channel, the pore diameter is 0.51nm×0.54nm), is the most widely used catalytic material so far, and is widely used in oil refining processes such as petroleum fluid catalytic cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/90C07C11/06C07C11/04C07C1/24
CPCY02P20/52Y02P20/584
Inventor 汪靖龙英才程晓维郭娟李春启忻仕河陈爱平李德炳梅长松
Owner DATANG INT CHEM TECH RESINST
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