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[求助]
催化剂制备过程
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All chemicals were of analytical grade and used without further purification. For the hydrothermal synthesis of WO 3 nanoparticles, Na2WO4 ·2H2O (0.4g, Fluka, 99%) was first dissolved in deionized water with NaCl (0.15g, Panreac, 99.5%) (as structure directing agent) [31] and then acidified with a variable amount of 3M HCl solution (Fluka, 37%) so that the final concentration of 2.7 (W1), 1.5 (W2) and 0.3M (W3) was reached. 中 then acidified with a variable amount of 3M HCl solution (Fluka, 37%) so that the final concentration of 2.7 (W1), 1.5 (W2) and 0.3M (W3) was reached是什么意思，需要怎么做 |
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