Preparation method of molecular sieve catalyst for formaldehyde removal
A catalyst and molecular sieve technology, applied in the field of formaldehyde catalyst preparation, can solve the problems of expensive equipment, high technical requirements, secondary pollution, etc., and achieve high removal effect and simple overall process
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Embodiment 1
[0022] Embodiment 1: 0.08g sodium metaaluminate (NaAlO 2 ) was dissolved in 40ml of deionized water, stirred until completely dissolved, then added 25ml of TPAOH template, continued to stir for 15min, then added 20ml of TEOS, continued to stir for 360min, slowly added 3.34ml of chloroplatinic acid (1g / 100ml) to the above mixed solution Solution, continue to stir for 60 minutes, react and crystallize in a closed reactor at 180°C for 4 days, then separate the solid matter by centrifugation, wash with deionized water several times, and roast at 550°C for 5 hours to remove the template agent, and then in a hydrogen atmosphere Reduction at 300°C for 120 minutes to obtain a catalyst.
Embodiment 2
[0023] Embodiment 2: 0.01g sodium metaaluminate (NaAlO 2 ) was dissolved in 40ml of deionized water, stirred until completely dissolved, then added 25ml of TPAOH template, continued to stir for 60min, then added 27ml of TEOS, continued to stir for 420min, slowly added 10ml of chloroplatinic acid (1g / 100ml) solution to the above mixed solution , continue stirring for 120min, react and crystallize in a closed reactor at 160°C for 6 days, then separate the solid matter by centrifugation, wash with deionized water several times, and roast at 650°C for 5h to remove the template agent, and then in a hydrogen atmosphere Reduction at 400°C for 2h to obtain the catalyst.
Embodiment 3
[0024] Embodiment 3: 0.73g sodium metaaluminate (NaAlO 2 ) in 40ml of deionized water, stirred until completely dissolved, then added 9ml of TPAOH template, continued to stir for 10min, then added 20ml of TEOS, continued to stir for 120min, slowly added 0.33ml of chloroplatinic acid (1g / 100ml) to the above mixed solution Solution, continue to stir for 10 minutes, react and crystallize in a closed reactor at 200°C for 2 days, then separate the solid matter by centrifugation, wash with deionized water several times, and roast at 350°C for 2 hours to remove the template agent, and then in a hydrogen atmosphere Reduction at 200°C for 30 minutes to obtain a catalyst.
[0025] Grind and sieve the catalysts prepared in the above four examples to 40-60 mesh, respectively take 0.1 g of the above catalysts and put them into a tubular fixed-bed reactor. Compressed air, humidity RH=50±5%, mass space velocity 600,000ml / (g h), formaldehyde inlet concentration 10mg / m3, catalyst activity is ...
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