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Preparation method of monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition

A catalytic decomposition and molecular sieve technology, which is applied in the fields of chemical engineering and environmental protection, to achieve high-efficiency removal, low conversion temperature, and stable catalytic activity

Inactive Publication Date: 2013-02-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned patented technology only focuses on the research and development of the preparation technology of the raw catalyst powder

Method used

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  • Preparation method of monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition
  • Preparation method of monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition
  • Preparation method of monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Preparation of 5% aluminum sol Fe-BEA monolithic molecular sieve catalyst

[0039] Accurately weigh the H-BEA molecular sieve catalyst (SiO 2 / Al 2 o 3 =30) (commercial molecular sieve) 10.0g, Fe(NO 3 ) 3 9H 2 O (analytical pure) 0.729g, deionized water 300mL, put it in a three-necked flask, and stir in a constant temperature water bath at 90°C for 6 hours. Then it was filtered and washed 3 times, dried in a drying oven at 100°C for 12 hours, then placed in a muffle furnace to program the temperature to 550°C, and roasted at a constant temperature for 5 hours to obtain a Fe ion-modified BEA molecular sieve powder sample, in which Fe The mass percentage of ions in the modified molecular sieve is 1%.

[0040] A large piece of cordierite (diameter 16.5mm, height 11mm, hole density 400cell / inch 2 ) into a small piece of cordierite with a hole number of 10×10, then grind it to a height of 5mm, and finally pick it into the required cylindrical shape with a p...

Embodiment 2

[0043] Example 2: Preparation of 10% aluminum sol Fe-BEA monolithic molecular sieve catalyst

[0044] The preparation of Fe-BEA powder molecular sieve is as described in Example 1. Select aluminum sol with a mass percentage of 20% as a binder, accurately weigh 4.000 g of Fe-BEA molecular sieve, 6.858 g of aluminum sol, and 2.824 g of deionized water. The rest of the preparation steps are as described in Example 1, and a Fe-BEA monolithic molecular sieve catalyst with 10% aluminum sol and a Fe-BEA loading capacity of 41.5% can be obtained. The activity evaluation means are the same as in Example 1, and the activity evaluation results are shown in Table 1.

Embodiment 3

[0045] Example 3: Preparation of 5% silica sol Co-BEA monolithic molecular sieve catalyst

[0046] Accurately weigh 10.0 g of H-BEA molecular sieve catalyst (commercial molecular sieve), Co(NO 3 ) 3 ·6H 2 O (analytical pure) 0.490g and deionized water 300mL, the rest of the preparation steps are the same as the preparation process of Fe-BEA modified molecular sieve in Example 1 to obtain Co-BEA powder molecular sieve, wherein Co accounts for the mass of modified molecular sieve (Co-BEA) The percentage is 1%.

[0047] The pretreatment of the original carrier of cordierite is the same as in Example 1.

[0048] Select silica sol with a mass percentage of 30% as a binder, accurately weigh 4.000 g of Co-BEA molecular sieve, 2.131 g of silica sol, and 6.528 g of deionized water. The remaining preparation steps are as described in Example 1, and 5% silica sol, 48.0% (mass percentage, based on the Co-BEA monolithic molecular sieve catalyst, the same below) Co-BEA monolithic molecu...

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Abstract

The present invention relates to a preparation method of a monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition. According to the monolithic BEA molecular sieve catalyst, cordierite is adopted as a carrier, a Fe and Co metal ion modified BEA molecular sieve is adopted as an active component, and a silica sol and an alumina sol are adopted to load the modified BEA molecular sieve on the cordierite to prepare the monolithic catalyst, wherein a ratio of the silica sol to the alumina sol is adjusted and the silica sol, the alumina sol and the modified molecular sieve are subjected to the optimal activity matching during the preparation process so as to prepare the high activity monolithic catalyst. Research results show that under reaction conditions of an airspeed of 4000 hour<-1> and a ratio of He to N2O of 65:35, the monolithic catalyst formed by matching the Co-BEA and 5% silica sol has the optimal activity, and the monolithic catalyst formed by matching the Fe-BEA and 5% alumina sol has the inferior activity. The monolithic BEA molecular sieve catalyst prepared by the preparation method has good catalytic activity and thermal stability, wherein a N2O conversion rate is 100% at a temperature of 500 DEG C.

Description

technical field [0001] The present invention relates to a method for N 2 The preparation method of the monolithic BEA molecular sieve catalyst that directly catalyzes and decomposes O belongs to the field of chemical engineering technology and environmental protection. It is a method for controlling air pollution, reducing greenhouse gas emissions, especially reducing N 2 O emission method. Background technique [0002] N 2 O is a major greenhouse gas whose greenhouse effect is that of CO 2 310 times that of , and because it is very stable in nature, N 2 O also destroys the ozone layer in the atmosphere, producing acid rain. N 2 The main source of O is human industrial production activities, in which adipic acid tail gas contains a large amount of N 2 O, its N 2 O emissions accounted for global N 2 10% of total O emissions. In order to protect human beings from the threat of climate warming, in December 1997, the "Kyoto Protocol" signed in Kyoto, Japan stipulated th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/86B01D53/56
Inventor 张润铎李英霞陈标华刘宁
Owner BEIJING UNIV OF CHEM TECH
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