Nho moi nguoi gop y giup ve ngu phap cua doan viet nay

Moi nguoi gop y giup toi ve ngu phap cua doan viet nay voi. Cam on moi nguoi rat nhieu

ùf~ Sol-gel process: Catalyst is prepared by the heterophase sol-gel method based on impregnation. This method needs to take into the estimated weight ratio between active component and support component in the end product.
ùf~ Co-reduction of precursors: salt of a catalytic metal and a support are mixed with organic compounds. The mixture is heated to form intimately mixed oxide particles.
ùf~ Impregnation: a catalytic precursor is dissolved in a solution and then this solution is put in contact with the support. In this method, the whole precursor deposits onto or into the supportõ?Ts surface. Finally, this solvent is evaporated and dried catalysts.
ùf~ Ion-exchange-precipitation: a solution of a catalyst precursor (e.g. cobalt-nitrite or cobalt-acetate) is used and brought into contact with a support. Anions of the precursors are exchanged with anions of the support to create new precursor molecules in solution. The catalytic precursor molecules are decomposed forming catalytic elements in oxide form.
ùf~ Reverse micelle method: a cationic surfactant is dissolved in a solvent followed by a dissolving metal salt. Under vigorous stirring, reducing agent was added to solution in order to reduce a colloidal dispersion of metal nanoparticles. The nanoparticles are purified and the final dispersion can be cast onto the support and dried at room temperature.
ùf~ Ion-adsorption-precipitation: an acid-base reaction between support and catalyst precursor is occurred at the supportõ?Ts surface to form precipitation of the catalyst precursor. The reaction can be controlled by the pH of the solution. Then, the precipitation is calcined to create a catalyst element in an oxidized form.
ùf~ Thermal decomposition of carbonyl complex: two carbonyls and a protective agent are mixed in a solution. The protective agent in solution is prevented nanoparticles from aggregation. The solution is refluxed under an inert atmosphere at a temperature allowing the decomposing precursor to formation catalytic nanoparticles.
ùf~ Metal organic chemical vapour deposition: a metal organic and support are dissolved in solvent. After the contact times (few hours) the solvent is evaporated and product is dried under reduced pressure. Catalytic precursor is vaporized and carried to a reactor zone by a carrier gas. The reactor zone is heated to decompose and to depose onto the surface.
ùf~ Physical deposition: metals are evaporated or sputtered to be deposited onto a substrate.

Mấy cái tài liệu kỹ thuật kiểu này chẳng mấy ai quan tâm đến ngữ pháp, văn phạm đâu. Nhưng nhìn sơ qua, mấy cái này dùng văn phạm đơn giản, toàn là simple present, thì đâu có vấn đề gì đâu.

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