Granular supported nano gold catalyst for closed CO2 laser device
A catalyst and supported technology, which is applied in the direction of lasers, laser components, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of harsh preparation conditions, poor direction selectivity in the physical manufacturing process, and high service life cost of lasers , to achieve the effect of long-term output power, prolonging the effective service life, and stable output power
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Embodiment 1
[0033] Weigh Al 2 o 3 1.94g of the original carrier was roasted at 650°C for 4h, and set aside; weighed 0.0712g La(NO 3 ) 3 ·6H 2 O, 0.0655g Fe(NO 3 ) 3 9H 2 O was dissolved in 2.8ml deionized water to form a Fe-La salt solution; the above-mentioned roasted Al 2 o 3 1.5h, then the resulting product was dried at 80°C for 8h, and calcined at 850°C for 4h to obtain FeLaO x / Al 2 o 3 (abbreviated as FLA) composite carrier.
[0034] Weigh HAuCl 4 ·H 2 O plus deionized water to prepare 7.14g Au / L solution, adjust the pH of the solution to 9~10 with KOH to obtain a gold precursor solution; impregnate the above-mentioned FLA composite carrier with equal volume of the gold precursor solution for 1.5h, soak the resulting product in ammonia water for 24h, and then remove the gold precursor solution for 24h. Wash with deionized water to remove chloride ions, then dry at 60°C for 12h, and then reduce with hydrogen at 300°C for 1h to prepare 1%Au / FLA catalyst.
[0035] The...
Embodiment 2
[0037] Adopt the Au / FLA catalyst prepared by specific embodiment 1, adopt simulated CO 2 The gas composition of the laser (1%CO, 0.5%O 2 , 60%CO 2 , 0.5% water vapor, the balance gas is an inert gas N 2 ), each time a freshly prepared catalyst was taken to test the catalytic ability of the catalyst for CO oxidation at different temperatures. The results are shown in Table 1. The Au / FLA catalyst showed relatively good catalytic activity, and the stability of the reaction catalyst at 120°C was relatively good within the investigated time period.
[0038] Table 1 Catalytic activity of 1%Au / FLA catalyst at different reaction temperatures in a simulated laser atmosphere (conversion rate R : CO mol (g Au ) -1 h -1 ) as a function of reaction time (h)
[0039]
Embodiment 3
[0041] Weigh 0.0610g La(NO 3 ) 3 ·6H 2 O, 0.0561g Fe(NO 3 ) 3 9H 2 O, 0.0210g zinc nitrate is dissolved in 2.8ml deionized water to form Zn-Fe-La salt solution, take the preparation procedure of embodiment 1, obtain ZnFeLaO x / Al 2 o 3 (ZFLA) vector. According to the steps in Example 1, only the reduction temperature was adjusted to 450° C. to obtain a 1% Au / ZFLA catalyst.
[0042] Using the evaluation conditions of Example 1, CO is completely converted into CO 2 The lowest full conversion temperature is -10°C.
[0043] Using the evaluation conditions of Example 2, the 1%Au / ZFLA catalyst also exhibits relatively good catalytic performance at different temperature ranges, and its stability is relatively good at 120°C. The experimental statistics are shown in Table 2.
[0044] Time (h) Temperature (°C) 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 30 0.58 0.48 0.48 0.42 0.50 0.38 0.35 0.32 0.29 － － 70 0.95 0.92 0.77 0.73 0...
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