Nanometer HZSM-5 molecular sieve catalyst modified by phosphorus and preparation method of such nanometer HZSM-5 molecular sieve catalyst modified by phosphorus

A molecular sieve and phosphorus modification technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor hydrothermal stability, short service life and low propylene selectivity of catalysts, and the conditions are easy to achieve Controlling, improving service life and low production cost

Inactive Publication Date: 2018-02-02
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of the existing HZSM-5 molecular sieves such as low propylene selectivity, poor hydrothermal stability and short service life in the process of catalyzi

Method used

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  • Nanometer HZSM-5 molecular sieve catalyst modified by phosphorus and preparation method of such nanometer HZSM-5 molecular sieve catalyst modified by phosphorus
  • Nanometer HZSM-5 molecular sieve catalyst modified by phosphorus and preparation method of such nanometer HZSM-5 molecular sieve catalyst modified by phosphorus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The percentage composition of a kind of P modified nanometer HZSM-5 molecular sieve P is:

[0029] The mass percentage of P element 0.5%

[0030] The mass percentage of HZSM-5 molecular sieve is 99.5%

[0031] Among them, the SiO of HZSM-5 2 / Al 2 o 3 =38

[0032] A kind of preparation method of P modified nanometer HZSM-5 molecular sieve is as follows:

[0033] (1) Accurately weigh 0.096g of (NH 4 ) 3 PO 4 ·3H 2 O was dissolved in 4.5mL of deionized water, and after it was completely dissolved, 3.0g of nano-sized HZSM-5 molecular sieves were weighed into the solution, stirred evenly, and soaked at room temperature for 5 hours, and then placed in an oven at 110°C after the treatment was completed. After drying overnight, the sample was baked in a muffle furnace at 550°C under the air for 4 hours, and the obtained sample was named NPZ-0.5.

[0034](2) Press the modified NPZ-0.5-38 sample into tablets, grind and sieve, select a 40-60 mesh sample, weigh 0.30 g of...

Embodiment 2

[0037] The percentage composition of a kind of P modified nanometer HZSM-5 molecular sieve P is:

[0038] The mass percentage of P element 1.0%

[0039] The mass percentage of HZSM-5 molecular sieve is 99.0%

[0040] Among them, the SiO of HZSM-5 2 / Al 2 o 3 =38

[0041] A kind of preparation method of P modified nanometer HZSM-5 molecular sieve is as follows:

[0042] (1) Accurately weigh 0.192g of (NH 4 ) 3 PO 4 ·3H 2 O was dissolved in 4.5mL of deionized water, and after it was completely dissolved, 3.0g of nano-sized HZSM-5 molecular sieves were weighed into the solution, stirred evenly, and soaked at room temperature for 5 hours, and then placed in an oven at 110°C after the treatment was completed. Internally dried overnight, after the sample was dried, it was placed in a muffle furnace at 550 °C for 4 h under air, and the obtained sample was named NPZ-1.

[0043] (2) The activity evaluation test of NPZ-1 is the same as in Example 1, and the activity test of NP...

Embodiment 3

[0046] The percentage composition of a kind of P modified nanometer HZSM-5 molecular sieve P is:

[0047] The mass percentage of P element 2%

[0048] The mass percentage of HZSM-5 molecular sieve is 99.5%

[0049] Among them, the SiO of HZSM-5 2 / Al 2 o 3 =38

[0050] A kind of preparation method of P modified nanometer HZSM-5 molecular sieve is as follows:

[0051] (1) 0.389g of (NH 4 ) 3 PO 4 ·3H 2 O was dissolved in 4.5mL of deionized water, and after it was completely dissolved, 3.0g of nano-sized HZSM-5 molecular sieves were weighed into the solution, stirred evenly, and soaked at room temperature for 5 hours, and then placed in an oven at 110°C after the treatment was completed. After drying overnight, the sample was baked in a muffle furnace at 550°C for 4 hours in air, and the obtained sample was named NPZ-2.

[0052] (2) The activity evaluation test of NPZ-2 is the same as in Example 1, and the activity test of NPZ-2 for the catalytic production of propylen...

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Abstract

The invention discloses a nanometer HZSM-5 molecular sieve catalyst modified by phosphorus and a preparation method of such nanometer HZSM-5 molecular sieve catalyst modified by the phosphorus. By thepreparation method, a nanometer HZSM-5 molecular sieve and a phosphorous compound (phosphoric acid or ammonium phosphate) serve as raw materials, and the nanometer HZSM-5 molecular sieve is modifiedby equivalent-volume impregnation. The preparation method is simple, environment friendly, less in energy consumption, low in production cost, remarkable in effect and convenient to implement, popularize and apply. The nanometer HZSM-5 molecular sieve catalyst modified by the phosphorus is used for catalyzing bioethanol(the content of ethyl alcohol ranges from 50% to 90%)for propylene reaction andhas the advantages of high propylene selectivity, long service life and remarkable water-resistant thermal stability.

Description

technical field [0001] The invention belongs to the technical field of modification and preparation of nano molecular sieve catalysts, and in particular relates to a phosphorus-modified nano HZSM-5 molecular sieve catalyst and a preparation method thereof. Background technique [0002] As a solid acid catalyst, HZSM-5 molecular sieve is widely used in the field of chemical production due to its excellent three-dimensional intersecting pore structure and easy-to-adjust acid properties. In the HZSM-5 molecular sieve catalytic ethanol to propylene reaction system, the acidic center on the molecular sieve is the active center of the catalytic reaction. Ethanol undergoes reaction processes such as ethanol dehydration, cracking, hydrogen transfer, isomerization, aromatization, and carbon deposition and coking on the acidic sites of molecular sieves, and propylene is an important product of this process. The selectivity of propylene is directly affected by the acid properties on t...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C1/20C07C11/06
Inventor 毛东森翟小龙皇甫娇娇郭强胜
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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