A kind of cu-sapo-34 molecular sieve catalyst, preparation method and application thereof

Abstract

The invention provides a Cu-SAPO-34 molecular sieve catalyst, a preparation method and an application thereof. The method comprises the following steps: adding pseudo-boehmite into deionized water for stirring, then adding one of fumed silica or silica sol and orthophosphoric acid, adding copper sulfate and tetraethylenepentamine after mixing, fully Add diethylamine, triethylamine or n-propylamine after stirring. Put the fully stirred gel into a hydrothermal reaction kettle for crystallization, then cool at room temperature, separate the solid crystalline product from the mother liquor, wash until neutral, dry, and roast at 600-850°C in air to obtain Cu‑SAPO‑ 34 molecular sieve catalyst. The present invention adopts one-step hydrothermal synthesis method to prepare Cu-SAPO-34 molecular sieve catalyst, and obtains NH 3 ‑SCR molecular sieve catalyst with excellent catalytic activity and hydrothermal stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a Cu-SAPO-34 molecular sieve catalyst, a preparation method and an application thereof. Background technique [0002] Take NH 3 Selective catalytic reduction of NOx or NH as a reducing agent 3 -SCR technology plays an extremely important role in the process of catalytic removal of NOx, and its key core is the development of SCR catalyst system. Due to the characteristics of diesel vehicles with variable operating conditions, large exhaust temperature changes, complex exhaust gas composition, and rapid flow changes, an excellent automotive catalyst must have the following properties: high catalytic activity in a wide temperature window, hydrothermal stability High resistance, high mechanical strength, anti-SO 2 And HC poisoning ability, anti-high airspeed ability and so on. While the current commonly used V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Although catalysts have been used indu...

AI Technical Summary

Problems solved by technology

However, if the copper content is too high, it is easy to form more CuO, and non-selective redox NH 3 , resulting in catalytic activity and N 2 Reduced selectivity

If the calcination temperature is low, the organic amine as the template cannot be completely removed, resulting in low crystallinity of the molecular sieve, small specific surface area and pore volume, and reduced catalytic activity.

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