Mesoporous molecular sieve-based catalyst used for ammonia removing, and preparation method and applications thereof

Abstract

The invention discloses a mesoporous molecular sieve-based catalyst used for ammonia removing, and a preparation method and applications thereof. The mesoporous molecular sieve-based catalyst comprises a mesoporous molecular sieve and at least one active ingredient; specific surface area of the mesoporous molecular sieve-based catalyst ranges from 400 to 750m<2>*g<-1>; the at least one active ingredient is embedded into pore passages of the mesoporous molecular sieve; particle size of the active ingredient ranges from 2 to 50nm; the active ingredient is a transition metal oxide; transition metal loading amount of the transition metal oxide accounts for 2 to 8wt% of the total weight of the mesoporous molecular sieve-based catalyst. According to the preparation method, different mesoporous molecular sieve carriers are prepared via in situ synthesis, and the mesoporous molecular sieve-based catalyst is obtained via loading of a certain amount of the active ingredient via dipping-rotary evaporation. When the mesoporous molecular sieve-based catalyst is used for an ammonia selective catalytic oxidation removing system, 100% catalytic efficiency can be achieved at 300 DEG C, energy consumption is reduced, and at the same time, catalyst catalytic efficiency and N2 selectivity are increased.

Description

technical field [0001] The invention relates to the technical field of chemical industry. More specifically, it relates to a mesoporous molecular sieve-based catalyst for ammonia removal and its preparation method and application. Background technique [0002] NH as one of air pollutants 3 It exists in many chemical productions (nitrates, nitrogenous fertilizers, petroleum refining, etc.), biological emissions, and vehicle exhaust treatment. Currently dealing with NH 3 The methods are biological, chemical and physical. Among them, due to the selective catalytic oxidation method (SCO-NH 3 ) let NH 3 with O 2 The reaction produces harmless H 2 O and N 2 , with the advantages of high reaction efficiency and short time, it is considered to be an efficient and ideal NH 3 Approach. The reaction process that it may involve is shown in the following four equations: [0003] 4NH 3 +3O 2 =2N 2 +6H 2 O (1) [0004] 4NH 3 +5O 2 =4N 2 +6H 2 O (2) [0005] 2NH 3 +2O ...

AI Technical Summary

Problems solved by technology

At present, there is no report on the application of mesoporous molecular sieves to the preparation of ammonia removal catalysts.

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