Palladium molecular sieve catalyst as well as preparation method and application thereof

Abstract

The invention relates to a palladium molecular sieve catalyst and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing palladium salt with an organic solvent, and adding a high-silicon molecular sieve carrier to obtain a catalyst precursor; and (2) carrying out non-equilibrium thermal shock treatment on the catalyst precursor, and cooling to obtain the palladium molecular sieve catalyst. A non-equilibrium thermal shock method is adopted, second-level transient heating is used for promoting in-situ decomposition and anchoring of a Pd precursor on the surface of the molecular sieve, Pd nano-particles which are uniform in particle size and uniform in dispersion are obtained, and the problem that precious metal is sintered and gathered in the steady-state roasting process is effectively solved; the catalyst shows excellent low-temperature activity and long-term stability in methane catalytic combustion reaction, effectively solves the problem of catalyst deactivation caused by high temperature and high water vapor in industrial waste gas treatment, and has important application potential in the field of environmental protection such as gas engine waste gas and coal mine gas treatment.

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