▎ 摘　　要

NOVELTY - Composite catalyst comprises first component and second component, which are compounded together in a mechanical mixing manner in the weight ratio of 0.01-20. The active ingredient of first components a molecular sieve with medium strong acid sites, and the active ingredient of second first components is a precious metal catalyst. The distance between the axis of first component and second first components between 50-40 mm. USE - The composite catalyst is useful eliminating formaldehyde completely in atmospheric environment. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a method for preparing composite catalyst comprising adding the needed ratio of first component and second first component into the container, using extrusion force generated by high speed movement of first component and second component and/or container, using at least one impact force, cutting force and friction force to realize separation, crushing, mixing uniformly, realizing mechanical energy by modulating temperature and carrier gas atmosphere, the conversion of heat energy and chemical energy, further adjusting the interaction between different components, in the mechanical mixing process, the mixing temperature is 20-100 degrees C, can be carried out in the atmosphere or directly in the air, the atmosphere is any one of (a) nitrogen and/or inert gas, (b) mixed gas of hydrogen and nitrogen and/or inert gas, where the volume of hydrogen in the mixed gas is 5-50%, (c) the mixed gas of carbon monoxide and nitrogen and/or inert gas, where the volume of carbon monoxide in the mixed gas is 5-20%, (d) the mixed gas of oxygen and nitrogen and/or inert gas, where the oxygen volume in the mixed gas is 5-20 %, the inert gas is at least one of helium gas, argon gas, and neon, mechanical mixing can be mechanical stirring, ball milling, shaking mixing, mechanical grinding in at least one kind of composite, specifically involves mechanically stirring is in the stirring groove, using the stirring rod to mix the first component and second component, by controlling the stirring time and speed, adjusting the mixing degree and the relative distance of first component and second component, where the stirring time is 5-120 minutes, the stirring speed is 30-300 times of rotation/minute, ball milling is using the grinding material and the catalyst to roll at high speed in the grinding tank, generating strong impact to the catalyst, rolling to disperse, mixing first component and second component, by controlling the ratio of the grinding material and the catalyst, adjusting the granularity and relative distance of the catalyst, where the size range of the grinding material is 5-15 mm, the mass ratio range of the grinding material and the catalyst is 20-100:1, mixing method of shaking table is pre-mixing the first component and second component, and placing into a container, by controlling the reciprocating oscillation or circumferential oscillation of the shaking table, realizing the mixing of first component and second component, by adjusting the oscillation speed and time, realizing uniform mixing and adjusting the relative distance, where the oscillation speed is 1-70 revolutions/minute (rpm), the oscillation time is 5-120 minutes, mechanical grinding method is pre-mixing the first component and second component, and placing into a container, under a specific pressure, performing relative movement through the grinding tool and the mixed catalyst, to adjust the catalyst granularity, relative distance and realizing uniform mixing action, where the pressure range is 5-20 kg, the moving speed range is 30-300 revolutions/minute (rpm); and (2) a method for eliminating formaldehyde completely in atmospheric environment using composite catalyst comprising the oxygen molecule in the air in the atmosphere environment is oxidized to carbon dioxide and water by the oxygen molecule in the air, when the noble metal in the second component is silver, the reaction temperature is in the range of 30-80 degrees C, the noble metal in the second component is other elements other than silver, the reaction temperature is in the range of 20-60 degrees C.