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Metal modified HZSM-5 molecular screen catalyst and its preparation method and uses in preparing methyl formate

A metal modification, molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as large-scale research of chemical raw materials and application limitations of dimethyl ether

Inactive Publication Date: 2006-09-27
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reality is that the application of dimethyl ether is limited to aerosols, refrigerants, blowing agents and fuels, and has not really been used as a chemical raw material for large-scale research, especially from the perspective of catalytic oxidation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take by weighing 2g HZSM-5 molecular sieve (Si / Al=50), 0.2606g manganese nitrate [Mn(NO 3 ) 2 ] solution was mixed with it, impregnated for 12 hours by equal-volume impregnation method, then dried in an oven at 90°C for 4 hours, and finally put into a muffle furnace and heated to 500°C for 5 hours at a heating rate of 3°C / min to obtain this product. In the Mn-modified molecular sieve catalyst Mn / HZSM-5 described in the invention, the loading amount of Mn is 2% (calculated by metal weight).

[0021] The activity evaluation of the catalyst was carried out in a continuous flow quartz fixed-bed reaction device (8 mm in diameter). The catalyst was screened into 40-60 meshes after being pressed into tablets, and 0.2 g was weighed and put into the reactor for reaction. The blank experiment used a complete empty tube without any catalyst. The catalyst was first heated at 400°C in O 2 / He ratio of 1:5 in the mixed gas aging for 1h, and then lower the temperature to 225 ° C to...

Embodiment 2

[0034] Weigh 2g HZSM-5 molecular sieve (Si / Al=50), 0.4336g Mg(NO 3 ) 2 ·6H 2 O was dissolved in deionized water, and the preparation method was the same as that of 1, and the Mg-modified molecular sieve catalyst Mg / HZSM-5 of the present invention was obtained, and the loading amount of Mg was 2% (by metal weight).

Embodiment 3

[0036] Weigh 2g HZSM-5 molecular sieve (Si / Al=50), 0.4336g Cu(NO 3 ) 2 ·3H 2O is dissolved in deionized water and dissolved in deionized water, and the preparation method is the same as 1, and the molecular sieve catalyst Cu / HZSM-5 modified by Cu of the present invention is obtained, and the loading capacity of Cu is 2% (by metal weight) .

[0037] reflect temperature /

℃

DME conversion

Rate%

Containing C, H product selectivity%

MF's receipt

Rate%

C1

C2

C3

MF

250

21.24

44.15

17.64

20.67

17.64

3.75

275

20.25

60.41

17.66

17.66

3.58

300

23.40

68.45

10.76

10.76

2.52

325

26.39

75.14

4.38

4.38

1.16

350

29.01

78.97

1.16

1.16

0.34

[0038] Reaction conditions: same as table 1

[0039] Table 3 and Table 4 are ...

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PUM

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Abstract

The present invention discloses one kind of metal modified HZSM-5 molecular sieve catalyst and its preparation process and application in preparing methyl formate. The metal modified HZSM-5 molecular sieve catalyst is V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, Mg, Ba, Ca, Pb, Sn, Mo, W, Sr, Zr, La or Bi modified HZSM-5 molecular sieve catalyst. After the catalyst is set inside a continuously flowing immobilized bed reactor, dimethyl ether, oxygen and inert gas in certain weight proportion are introduced to react at certain temperature to prepare methyl formate. The catalyst results in high dimethyl ether converting rate and high methyl formate yield, and this proves the high reaction activity, high stability and high target product selectivity of the catalyst.

Description

technical field [0001] The invention relates to a metal-modified HZSM-5 molecular sieve catalyst, to a preparation method of the catalyst, and to an application of the catalyst in preparing methyl formate by catalytic oxidation of dimethyl ether. Background technique [0002] With the development of the world economy, there is a relative shortage of petroleum resources. Under such circumstances, the production of chemical products from natural gas is becoming the focus of attention. At present, using natural gas as a raw material, a substantial breakthrough has been made in the one-step synthesis of dimethyl ether under milder conditions, thus realizing the process of industrial production of dimethyl ether through natural gas, changing the past production of dimethyl ether based on methanol, The phenomenon of low output and high cost. At present, the production of dimethyl ether abroad (using oil and natural gas as raw materials) has reached a certain scale. Japan, Iran, I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C67/39C07C69/06
Inventor 余林向杰吕逵弟孙明郝志峰余倩李永峰彭兰乔王雪涛许洁瑜
Owner GUANGDONG UNIV OF TECH
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