The advantage of catalytic hydrogenation over chemical reduction is that the product has higher purity quotient and is separated more easily.
与化学还原方法相比催化氢化的优点在于产品纯度高，易分离。
The particle size, crystal phase and purity quotient of alumina powder prepared by different kinds of methods are suggested. Their advantages and disadvantages are also compared.
指出了用各种方法制得的氧化铝粉末的粒径、晶型和纯度，并比较了各类方法的优缺点。
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