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Fe-SAPO-34 molecular sieve catalyst and preparation method and application thereof

A technology of fe-sapo-34 and molecular sieves, which is applied in the direction of molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of inability to prepare Fe-SAPO-34 and form metal oxides, and achieve good water resistance and operation The effect of simple steps and high specific surface area

Pending Publication Date: 2020-09-22
CHANGZHOU VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the SAPO-34 molecular sieve modified by copper ions is the most researched in the field of denitrification, while the research on SAPO-34 modified by iron ions is less, mainly because Fe 3+ The ionic radius of The pore size of SAPO-34 molecular sieve is Unable to prepare Fe-SAPO-34 by conventional ion exchange method
However, the iron ion-doped molecular sieve catalyst prepared by the impregnation method is likely to cause iron ions to accumulate on the surface of the molecular sieve to form metal oxides, which selectively catalyzes the reduction of NO to hydrocarbons. x unfavorable

Method used

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  • Fe-SAPO-34 molecular sieve catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Adopt the inventive method to prepare Fe-SAPO-34 molecular sieve catalyst P0, step is as follows:

[0028] S1: Dissolve 2.954g of pseudo-boehmite in 27g of deionized water and stir for 30 minutes, then slowly drop in 2.93mL of phosphoric acid and stir for 2 hours to completely peptize the pseudo-boehmite. After the peptization is complete, add 0.439g of nonahydrate Ferric nitrate continued to stir for 1 h, then added 14 mL of triethylamine and stirred for 1 h, and added 1.029 g of fumed silica and stirred for 2 h to obtain a reactant mixture, wherein the molar feed ratio of each reaction raw material was calculated as Al 2 o 3 :P 2 o 5 :TEA:SiO 2 :H 2 O: [Fe 3+ ]:PEG=1:1:4.7:0.8:70:0.05:0;

[0029] S2: Transfer the reactant mixture prepared in step S1 to a reaction kettle lined with polytetrafluoroethylene, and crystallize the reaction kettle at 200° C. and autogenous pressure for 48 hours;

[0030] S3: After the crystallization is completed, cool the reaction ke...

Embodiment 2

[0032] Adopt the inventive method to prepare Fe-SAPO-34 molecular sieve catalyst P1, the steps are as follows:

[0033] S1: Dissolve 2.954g of pseudo-boehmite in 27g of deionized water and stir for 30 minutes, then slowly drop in 2.93mL of phosphoric acid and stir for 2 hours to completely peptize the pseudo-boehmite. After the peptization is complete, add 0.439g of nonahydrate Ferric nitrate continued to stir for 1 h, then added 14 mL of triethylamine and stirred for 1 h, added 1.029 g of fumed silica and stirred for 2 h, and finally added 1.714 g of PEG2000 and stirred for 3 h to obtain a reactant mixture, wherein the molar feed ratio of each reaction raw material was calculated as al 2 o 3 :P 2 o 5 :TEA:SiO 2 :H 2 O: [Fe 3+ ]:PEG=1:1:4.7:0.8:70:0.05:0.04;

[0034] S2: Transfer the reactant mixture prepared in step S1 to a polytetrafluoroethylene-lined reactor, and crystallize the reactor at 200° C. under autogenous pressure for 36 hours;

[0035] S3: After the cryst...

Embodiment 3

[0037] Adopt the inventive method to prepare Fe-SAPO-34 molecular sieve catalyst P2, step is as follows:

[0038] S1: Dissolve 2.954g of pseudo-boehmite in 27g of deionized water and stir for 30 minutes, then slowly drop in 2.93mL of phosphoric acid and stir for 2 hours to completely peptize the pseudo-boehmite. After the peptization is complete, add 0.439g of nonahydrate Ferric nitrate continued to stir for 1 h, then added 14 mL of triethylamine and stirred for 1 h, added 1.029 g of fumed silica and stirred for 2 h, and finally added 2.571 g of PEG2000 and stirred for 3 h to obtain a reactant mixture, wherein the molar feed ratio of each reaction raw material was calculated as Al 2 o 3 :P 2 o 5 :TEA:SiO 2 :H 2 O: [Fe 3+ ]:PEG=1:1:4.7:0.8:70:0.05:0.06;

[0039] S2: Transfer the reactant mixture prepared in step S1 to a reaction kettle lined with polytetrafluoroethylene, and crystallize the reaction kettle at 200° C. and autogenous pressure for 48 hours;

[0040] S3: Af...

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Abstract

The invention discloses a Fe-SAPO-34 molecular sieve catalyst and a preparation method and application thereof. The Fe-SAPO-34 molecular sieve catalyst has the characteristics of relatively good waterresistance, sulfur resistance and high-temperature hydrothermal stability resistance, the specific surface area is 656 m < 2 >. G <-1 > or above, and the catalytic efficiency of reducing NO by takingpropylene as a reducing agent within the temperature range of 250-350 DEG C can almost reach 100%; the Fe-SAPO-34 molecular sieve catalyst is suitable for being used as a catalyst for diesel vehicletail gas denitration treatment under the conditions of oxygen enrichment and taking hydrocarbon as a reducing agent. According to the synthetic method of the Fe-SAPO-34 molecular sieve catalyst, the Fe-SAPO-34 molecular sieve catalyst is synthesized by adopting triethylamine and polyethylene glycol as double synergistic templates and directly doping iron ions into a molecular sieve skeleton by utilizing a one-step hydrothermal synthesis method so that the operation steps are simple, and a foundation is laid for industrial production of the Fe-SAPO-34 molecular sieve catalyst.

Description

technical field [0001] The invention relates to the technical field of denitrification catalyst synthesis, in particular to an Fe-SAPO-34 molecular sieve catalyst, a preparation method and an application. Background technique [0002] At present, the SCR denitrification of diesel vehicle exhaust mainly uses ammonia as the reducing agent. Ammonia has problems such as leakage and secondary environmental pollution, and the cost of transportation and storage is also high. Hydrocarbons are used as reducing agents to simultaneously eliminate hydrocarbons in diesel vehicle exhaust. And nitrogen oxides, and the source of hydrocarbons is abundant, the price is relatively low. [0003] Iron (Fe)-modified zeolite catalysts have been widely used in denitrification research due to their excellent water and sulfur resistance. However, Fe-modified molecular sieves widely studied at present, such as Fe-ZSM-5, have problems such as poor low-temperature activity, poor water and sulfur resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85C01B39/54B01D53/94B01D53/56F01N3/20
CPCB01J29/85C01B39/54B01D53/9413F01N3/2066B01J2229/183B01D2251/208F01N2570/14
Inventor 周皞杨迪苏亚欣
Owner CHANGZHOU VOCATIONAL INST OF ENG