For low temperature catalytic decomposition n 2 The composite oxide catalyst of o and preparation thereof

Abstract

The invention belongs to the technical field of chemical catalysts and air pollution prevention and particularly relates to an oxide composite catalyst for low-temperature catalyst decomposition of N2O and a preparation method of the oxide composite catalyst. The catalyst is of a composite oxide formed by a cobalt oxide and a tin oxide, the cobalt oxide is of an active component while the tin oxide is of a promoter, and the mole ratio of tin / cobalt is 0.01-0.1:1. The preparation method includes: evenly mixing a certain amount of cobalt salt and tin salt with urea prior to fully grinding; performing soaking treatment via a water / ethanol solution of formic acid and obtaining the catalyst via steps of centrifuging, drying, calcinating and the like. The prepared catalyst is wide in application, the reaction temperature is 300-400DEG C at normal pressure, N2O is 1000-10000ppm in concentration, space velocity is 10000-30000h<1>, the content of O2 is 1-20%, and N2O can be effectively catalyzed and decomposed to be N2 and O2 under the condition that the content of H2O is 1-10%.

Description

technical field [0001] The present invention relates to catalytic decomposition of N 2 The technical field of O catalyst and air pollution control, specifically a kind of catalyst that can be used to decompose N at low temperature under the conditions of oxygen and water vapor. 2 Cobalt-tin composite oxide catalyst of O and preparation method thereof. Background technique [0002] N 2 O has long been considered as a gas that is harmless to the environment, and is widely used as a combustion aid, rocket oxidizer, and anesthetic. In recent decades, with the development of N 2 With the continuous deepening of O research and understanding, a consensus has been formed on its environmental hazards. N 2 O has high atmospheric stability (average lifespan is about 120 years), not only can destroy the ozone layer, but also is one of the gases that cause the strongest greenhouse effect, and its global warming potential (GWP) is respectively 2 310 times and CH 4 21 times. The "K...

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Problems solved by technology

Noble metal catalysts usually use Pd, Ru, Ir, Pt, etc. as active components, and MgO, SiO 2 , CeO 2 、 Al 2 o 3 or TiO 2 etc. as the carrier, although it shows good catalytic activity, the high price of noble metals and the scarcity of resources limit its use in catalytic elimination of N 2 Extensive use in O

Most of the molecular sieve catalysts are molecular sieves based on the ion exchange of transition metals Fe, Co, Ni, Cu, Mn, among which Fe-ZSM-5 and Cu-ZSM-5 are two commonly used molecular sieve catalysts, but their catalytic reaction temperature is relatively high, and Irreversible deactivation easily occurs when the feed gas contains oxygen or water vapor