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A preparation method of CeO*-mol sieve catalyst

A molecular sieve and catalyst technology, applied in the field of preparation of CeO2- molecular sieve catalyst, can solve the problems of poisoning, deactivation, easy carbon deposition of the catalyst, etc., and achieve the effects of low catalyst cost, simple preparation process, good catalytic degradation activity and stability

Inactive Publication Date: 2009-06-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, noble metal catalysts and transition metal catalysts, such as Pt, Pd, Ru, Rh, Ir, Au, Cu, Co, Ni, Mn, Fe, Cr, Ag, V, etc., have higher catalytic activity for the oxidative degradation of CVOCs , but easily poisoned by the product hydrochloric acid and chlorine gas and inactivated
Molecular sieve materials and their metal-supported molecular sieves have good structural properties. For example, Y molecular sieve has the characteristics of stable structure, high acid strength, and high acid density. It has protonic acid centers and Lewis acid centers, and has become a research hotspot in this field. However, CVOCs On the surface of these catalysts, polychlorides are easily produced as by-products, and the catalysts are also prone to carbon deposition and deactivation

Method used

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  • A preparation method of CeO*-mol sieve catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Weigh 2.52g of cerous nitrate and 8.0g of molecular sieve (H-USY, H-SSY, H-ZSM-5 or H-BETA) powder respectively, mix and grind until the mixture is uniform. Then dry at 100°C for 2 hours, calcined at 350°C for 0.5 hour, and then calcined at 550°C for 2 hours to obtain CeO 2 - Molecular sieve catalyst, CeO in the catalyst 2 The mass ratio of molecular sieve is 1 / 8.

Embodiment 2

[0011] With the same operation of embodiment 1, the difference is: the consumption of cerous nitrate is changed into 15.14g, the consumption of H-USY molecular sieve is changed into 3.0g, in this catalyst, CeO 2 The mass ratio of molecular sieve is 2 / 1.

Embodiment 3

[0013] With the same operation of embodiment 1, the difference is: the consumption of cerous nitrate is changed into 20.18g, the consumption of H-USY molecular sieve is changed into 1.0g, the roasting temperature of 550 ℃ is changed into 650 ℃, the CeO in this catalyst 2 The mass ratio of molecular sieve is 8 / 1.

[0014] Catalyst in 1~3 example is shown in the following table to the catalytic degradation activity of chlorine-containing organic matter:

[0015]

[0016] Note: 0.3ml catalyst with a particle size of 60-80 mesh and a space velocity of 10000h -1 .

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Abstract

The present invention provides a preparation method of CeO*-mol sieve catalyst which takes cerous nitrate and molecular sieve with strong acid as raw material and takes mechanical lapping method for preparation of CeO*-mol sieve catalyst, wherein mass ratio of CeO2 / molecular sieve in the catalyst is 8 / 1-1 / 10, and molecular sieve as one of H-USY, H-SSY, H-ZSM-5 or H-BETA molecular sieve. The process is simple, cost low, and has good catalysis and degradation activity and stability to chloring-containing organic compounds like carrene (DCM), dichloroethanes (DCE) and ethinyltrichloride (TCE).

Description

technical field [0001] The invention relates to a preparation method of a chlorine-containing organic waste gas combustion catalyst, in particular to CeO 2 - Preparation method of molecular sieve catalyst. Background technique [0002] Chlorine-containing volatile organic compounds (CVOCs) are a kind of VOCs pollutants, the common ones are dichloromethane (DCM), chloroform (CF), dichloroethane (DCE), trichloroethylene (TCE), four Carbon chloride (CT), chlorobenzene (PhCl), etc., are widely used as a common organic solvent and a semi-finished product in the chemical production process. However, such substances are extremely harmful to the environment and human health. For the removal of chlorine-containing organic substances, thermal combustion is currently the main method of post-treatment. Compared with heat treatment, catalytic combustion is one of the most important and effective methods for purifying VOCs pollutants due to its technical and economic advantages. Simila...

Claims

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Application Information

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IPC IPC(8): B01J29/08B01J29/40F23G7/06
Inventor 周仁贤赵岚黄琴琴
Owner ZHEJIANG UNIV
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