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Paraffinic hydrocarbon aromatization catalyst and its preparation method

A catalyst and aromatization technology, applied in the field of alkane aromatization catalyst and its preparation, can solve the problems of unreported preparation research, high catalyst cost, catalyst sulfur poisoning, etc., achieve simple process, good catalytic activity, and improve conversion rate effect

Inactive Publication Date: 2006-09-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents CN1073198 and CN1096972 use macroporous basic L zeolite carrying precious metal Pt, alkaline earth metal and a small amount of chlorine as catalysts to convert naphthenes in naphtha into gasoline with high octane number and aromatic hydrocarbons in petrochemical raw materials. Good aromatization activity, but poor stability, the catalyst is prone to sulfur poisoning, and the cost of the catalyst is greatly increased by loading noble metals, which is not conducive to the promotion of industrialization
In recent years, with the research progress of nanomaterials, it has been recognized that the use of nano-size effect to improve the performance of catalysts has been recognized, but there are no reports on the use of zeolite molecular sieves as carrier nano-molecular sieve aromatization catalysts and their preparation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] (3) Preparation of HZSM-5

[0037] Put the raw powder obtained in (2) in an ion exchange bottle, pour the prepared 1N ammonium nitrate solution into the exchange bottle, stir evenly, raise the temperature to 100°C, and keep it for 4 hours, then filter off the mother liquor, and use deionized water The filter cake was washed and dried at 110° C. for 4 hours. Calcined at 540° C. for 4 hours in an air atmosphere to obtain a ZSM-5 nanomolecular sieve carrier.

[0038] (4) Introduction of metal elements

[0039] Stir the carrier prepared in (3) with 0.1N zinc nitrate or gallium nitrate solution in an ion exchange bottle, exchange at 100°C for 4 hours, then filter off the mother liquor, wash the filter cake with deionized water, and then carry out the second exchange. After the second exchange, after filtering and cleaning, the filter cake was dried at 110°C for 4 hours and calcined at 540°C for 4 hours to obtain a ZSM-5 nano-molecular sieve aromatization catalyst loaded w...

Embodiment 1

[0045] Example 1: SiO 2 / Al 2 o 3 The preparation of the ZSM-5 nano molecular sieve catalyst of =30

[0046] Water glass and aluminum sulfate are used as raw materials, tetrapropylammonium hydroxide is used as a template, and ethylenediamine is used as an auxiliary agent. According to following chemical composition (molar ratio) batching:

[0047] Al 2 o 3 / SiO 2 0.032

[0048] SiO 2 1

[0049] Na 2 O / SiO 2 0.072

[0050] TPAOH / SiO 2 0.4

[0051] NaCl / SiO 2 0.06

[0052] Ethylenediamine / SiO 2 0.1

[0053] Water / SiO2 2 150

[0054] Aluminum sulfate, water, sulfuric acid and sodium chloride are made into solution A; water glass, seed crystals and water are made into solution B; tetrapropylammonium hydroxide is made into solution C, and ethylenediamine is made into solution D. First put solution B into the reaction kettle, slowly add solution C to solution B under strong...

Embodiment 2

[0057] Embodiment 2: This example illustrates that the zeolite nano-molecular sieve aromatization catalyst of the present invention is to C 3 It has good catalytic performance for alkane aromatization. Get the Zn modified ZSM-5 nano molecular sieve aromatization catalyst 0.5g that embodiment 1 obtains, pack in the fixed-bed reactor, carry out C 3 Propane aromatization reaction. The reaction is carried out under continuous flow isothermal conditions, and the raw material gas is propane gas with a volume content of 99.5%. The product is analyzed online through a high-temperature six-way valve, and the alkane conversion rate and aromatics selectivity are calculated based on carbon number normalization. Reaction temperature is that the data that 550 degree, 630 degree measure are shown in table 1. The results show that the catalyst has excellent reactivity and selectivity for propane aromatization, with C 6 ~C 8 The predominantly aromatics yield was higher than 70%.

[0058]...

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Abstract

A catalyst for aromatizing paraffin is a non-noble metal modified nano-class zeolite molecular sieve, which is composed of MFI-type zeolite molecular sieve as carrier and the Zn and Ga as active component. It has high catalytic activity, selectivity and stability. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to an alkane aromatization catalyst and a preparation method thereof, in particular to a nano-aromatization catalyst with molecular sieve as a carrier and a preparation method thereof, which can be used for C 3 ~C 8 Alkane dehydroaromatization process. Background technique [0002] C 3 ~C 8 Aromatization of alkanes can increase the utilization value of alkanes, and its aromatized products such as benzene, toluene, xylene, naphthalene, etc. are important raw materials for organic chemical and fine organic chemical production, which can be used directly or indirectly for solvents, rubber, unsaturated The production of polyester and pharmaceutical intermediates has a wide range of uses. Currently, the most studied catalysts for alkane aromatization include transition metals or noble metals as active components, and various types of additives are added to obtain high-performance catalysts. [0003] The aromatization catalysts dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/06B01J23/06B01J23/08C07C5/41C10G45/70
Inventor 陈标华黄崇品侯焕娣李英霞
Owner BEIJING UNIV OF CHEM TECH
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