MnMe/molecular sieve series catalysts and preparation and application thereof

Abstract

The invention relates to MnMe / molecular sieve series catalysts and preparation and application thereof. The catalysts of the invention comprise a carrier, a main active component and an auxiliary active component, wherein the carrier is selected from an MFI structural molecular sieve, a Y molecular sieve and a beta molecular sieve; the main active component is the oxides of metal Mn; and the auxiliary active component Me is selected from one or the combination of two or more oxides of transition metal or rare earth metal or alkaline earth. The preparation method comprises the following steps: respectively dissolving the metal salts of the metal Mn and the metal Me in water, putting the molecular sieve carrier into the water solution, soaking, drying to obtain the catalyst precursors, and then calcinating to obtain the catalysts. The catalysts of the invention have low operating temperature, can reduce the energy consumption and the investment cost, have very low activating temperature, can have very high activity in a wide temperature range, and also have certain sulfur-resisting and water-resisting capacities.

Description

technical field [0001] The present invention relates to a kind of catalyzer used in air pollution control technology, relate to a kind of catalyzer of MnMe / molecular sieve series in particular, can be used for low temperature NH 3 Selective reduction NOx catalyst; the invention also relates to the preparation method and application of the catalyst. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants that cause a series of problems such as acid rain and photochemical smog that damage the earth's ecological environment, and it is also the focus and difficulty of atmospheric environmental governance. In 2005, the national NO x The total emissions will reach about 18 million tons, and the emissions from the power industry will account for about 1 / 2. It is estimated that the national NO x Emissions will reach around 29 million tons. In July 2004, my country promulgated and implemented the "Emission Standard of Air Pollutants for Thermal Pow...

AI Technical Summary

Problems solved by technology

However, the main problems of this type of catalyst are: the operating temperature is higher than 350°C, the energy consumption is high, the investment cost is high, and it is easily poisoned by heavy metals such as arsenic and alkali metals in the dust.

However, these catalysts still have insufficient low-temperature activity, unsatisfactory selectivity, and resistance to SO 2 Poor toxicity and poor anti-sintering ability of active components