Highly stable hollow molecular sieve, selective catalyst prepared by utilizing the hollow molecular sieve and application thereof

A high-stability, molecular sieve technology, applied in the field of selective catalysts and high-stability hollow molecular sieves, can solve the problems of short service life of anti-sulfur and water-resistance, the catalyst cannot have both high and low temperature activity, etc., and achieves large filling amount and excellent catalytic performance. Active, promising effect for industrial application

Active Publication Date: 2018-09-25
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the above-mentioned catalyst cannot have the three characteristics of high and low temperature activity, N2 selectivity, sulfur resistance and water resistance, and has a short service life. It provides a high-stability hollow molecular sieve and a selective Catalysts and Applications

Method used

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  • Highly stable hollow molecular sieve, selective catalyst prepared by utilizing the hollow molecular sieve and application thereof
  • Highly stable hollow molecular sieve, selective catalyst prepared by utilizing the hollow molecular sieve and application thereof
  • Highly stable hollow molecular sieve, selective catalyst prepared by utilizing the hollow molecular sieve and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of hollow ZSM-5 molecular sieve

[0040] Add 1.5g ZSM-5 molecular sieve (SiO2:Al2O3=20:1 (molar ratio)) to 60mL deionized water and 40mL absolute ethanol mixture, stir for 30min; add 15mL NaOH (0.1mol / L) solution, stirred at 30°C for 1h; added 10mL of TPAOH to the above solution, and stirred for 30min; put the above solution into a reaction kettle, sealed, and crystallized at 50°C. Dry under vacuum for 10h, calcined at 650°C for 10h to obtain hollow ZSM-5 molecular sieve (see figure 1 ).

[0041] It can be seen from the figure that the overall structure of the ZSM-5 molecular sieve has not been destroyed, and a hollow molecular sieve has been formed.

[0042] (2) Preparation of Ag / hollow ZSM-5 catalyst

[0043] Add 1.0g hollow ZSM-5 molecular sieve to 100mL deionized water, keep the absolute pressure of the rotary evaporator at 0.06MPa, the rotation speed at 150r / min, and the temperature at 60°C until it evaporates to dryness; add 0.1575g of silver n...

Embodiment 2

[0046] (1) Preparation of hollow Beta molecular sieve

[0047] Add 2g of Beta molecular sieve (SiO2:Al2O3=100:1) into 70mL of deionized water and 50mL of absolute ethanol mixture, stir for 60min; add 20mL of KOH (0.1mol / L) solution to the above solution, and stir at 30°C 4h; add 15mL of TPABr to the above solution, stir for 30min; put the above solution into the reaction kettle, seal it, and crystallize it at 80°C. Calcined for 12 hours to obtain a hollow Beta molecular sieve.

[0048] (2) Preparation of Ag / hollow Beta catalyst

[0049] Add 0.8g of hollow Beta molecular sieves to 80mL of deionized water, keep the absolute pressure of the rotary evaporator at 0.09MPa, the rotation speed at 300r / min, and the temperature at 80°C until evaporated to dryness; add 0.0124g of silver acetate to 70mL of deionized water , stirred for 40 minutes until completely dissolved; the silver acetate solution was added to a rotary evaporating flask equipped with a hollow Beta molecular sieve, a...

Embodiment 3

[0051] (1) Preparation of hollow HY molecular sieve

[0052] Add 2g HY molecular sieve (SiO2:Al2O3=40:1) into 70mL deionized water and 50mL absolute ethanol mixture, stir for 90min; add 40mL Na2CO3 (0.1mol / L) solution to the above solution, stir at 30°C 3h; add 5mL of TEA to the above solution, stir for 30min; put the above solution into the reaction kettle, seal it, and crystallize it at 70°C. Calcined for 8 hours to obtain hollow HY molecular sieves.

[0053] (2) Preparation of Ag / hollow HY catalyst

[0054] Add 1g of hollow HY molecular sieve into 80mL of deionized water, keep the absolute pressure of the rotary evaporator at 0.085MPa, the rotation speed at 200r / min, and the temperature at 70°C until evaporated to dryness; add 0.1445g of silver sulfate into 70mL of deionized water, Stir for 40 minutes until completely dissolved; add the silver sulfate solution into the rotary evaporator bottle equipped with hollow HY molecular sieves, keep the absolute pressure of the rot...

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Abstract

The invention relates to the technical field of environmental catalytic purification, and relates to a highly stable hollow molecular sieve used for removing ammonia pollution generated in industrialand transportation processes, a selective catalyst prepared by utilizing the hollow molecular sieve and an application thereof. The hollow molecular sieve is obtained by hydrothermal alkali dissolution treatment of a molecular sieve, wherein the molecular sieve is ZSM-5, HY, Beta, or SAPO-34. A catalyst carrier is the hollow molecular sieve. An active component is silver. The carrier is prepared by hydrothermal alkali dissolution post-treatment. The active component, silver, is encapsulated in the hollow molecular sieve carrier through a vacuum rotating impregnation method. The prepared catalyst has high activity at low temperature. NH3 can be completely converted at low temperature up to 140 DEG C, and the N2 selectivity is 85% or above. The stability is high, and the industrial application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of environmental catalytic purification, and relates to a high-stability hollow molecular sieve used for removing ammonia pollution generated in processes such as industry and traffic, and a selective catalyst prepared by using the hollow molecular sieve and its application. Background technique [0002] In recent years, with the increase of smog phenomenon, my country also regards "smog weather" as disastrous weather for early warning and forecasting. Among them, motor vehicle exhaust is the most important component of smog particles. Therefore, how to efficiently control NOx emissions has become a current research hotspot. The Selective Catalytic Reduction (SCR) method has become the most mainstream and relatively mature denitrification technology today, among which NH3 is the most widely used as the reducing agent. Due to various reasons in the denitrification process, some NH3 must not be completely co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J29/44B01J29/12B01D53/86B01D53/58
CPCB01D53/8634B01J29/126B01J29/44B01J29/7415Y02A50/20
Inventor 李学兵王忠辛洪川黄河
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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