Sodium molybdate, chemical formula Na2MoO4, CAS 7631-95-0, is an inorganic compound with a rhombic crystal structure. It is a white to light yellow solid, usually present in powder form. Its powder form has high crystallinity and purity. Easy to dissolve in water, forming soluble sodium molybdate. It has good solubility in water, making it widely used in aqueous solutions. It is an ionic compound, therefore it has good conductivity in a molten state. However, its solubility is relatively low, so the conductivity of its aqueous solution is relatively weak. As a multifunctional inorganic compound, it has broad application prospects. In different fields, its unique physical and chemical properties are fully utilized and play an important role. With the continuous development of science and technology and the exploration of new application fields, its application prospects will be even broader. As an excellent catalyst, it is widely used in various organic chemical reactions. The main advantage of it as a catalyst is its high activity and selectivity, which can effectively promote the progress of various organic reactions. For example, it can be used to catalyze dehydration reactions, alkylation reactions, acylation reactions, etc. of alcohols. During the catalyst preparation process, it can be compounded with other metal oxides or metal oxides loaded on the carrier to achieve better catalytic performance.
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Method 1: The synthesis of sodium molybdate through sodium hydroxide is a commonly used method.
Steps:
(1) Preparation of raw materials: Firstly, we need to prepare the necessary raw materials, including sodium hydroxide (NaOH) and ammonium molybdate ((NH4) 2MoO4).
(2) Dissolution: Dissolve sodium hydroxide in water to obtain a sodium hydroxide solution. Meanwhile, dissolve ammonium molybdate in water to obtain a solution of ammonium molybdate.
(3) Mixing: Mix sodium hydroxide solution and ammonium molybdate solution together to obtain a mixed solution.
(4) Reaction: In a mixed solution, sodium hydroxide and ammonium molybdate undergo a chemical reaction, producing sodium molybdate and water.
(5) Filtering: After the reaction is completed, the unreacted raw materials and generated water are filtered to obtain a sodium molybdate solution.
(6) Drying: Dry the sodium molybdate solution to obtain the solid state of sodium molybdate.
Chemical equation:
NaOH + (NH4)2MoO4 → Na2MoO4 + 2H2O + 2NH3
In this reaction, sodium hydroxide and ammonium molybdate are both reactants. The molecular formula of sodium hydroxide is NaOH, which is a strong base that can provide hydroxide ions (OH -). The molecular formula of ammonium molybdate is (NH4) 2MoO4, which is a salt containing molybdate ions (MoO42-). When sodium hydroxide and ammonium molybdate are mixed, they undergo a double decomposition reaction, producing sodium molybdate (Na2MoO4), water (H2O), and ammonia (NH3). Water is one of the products that is discharged in a gaseous form. Ammonia is also a product, it is an alkaline gas with a pungent odor.
Method 2: The synthesis of sodium molybdate through water is a commonly used method.
Steps:
(1) Preparation of raw materials: Firstly, we need to prepare the required raw materials, including ammonium molybdate ((NH4) 2MoO4) and pure water (H2O).
(2) Dissolution: Dissolve ammonium molybdate in water to obtain ammonium molybdate solution.
(3) Reaction: In ammonium molybdate solution, ammonium molybdate reacts chemically with water to produce sodium molybdate (Na2MoO4) and hydrated ammonia (NH3 · H2O).
(4) Filtration: After the reaction is completed, the unreacted raw materials and generated hydrated ammonia are removed through filtration to obtain a sodium molybdate solution.
(5) Drying: Dry the sodium molybdate solution to obtain the solid state of sodium molybdate.
Chemical equation:
(NH4)2MoO4 + H2O → Na2MoO4 + 2NH3·H2O
In this reaction, ammonium molybdate and water are both reactants. The molecular formula of ammonium molybdate is (NH4) 2MoO4, which is a salt containing molybdate ions (MoO42-). When ammonium molybdate is mixed with water, they undergo a double decomposition reaction, producing sodium molybdate (Na2MoO4) and hydrated ammonia (NH3 · H2O). Hydrated ammonia is a compound formed by combining ammonia gas and water molecules. In this reaction, water is used as a solvent to help the reaction proceed smoothly.
Method 3: The synthesis of sodium molybdate through the sodium carbonate ammonium molybdate method is a commonly used synthesis method.
Steps:
(1) Preparation of raw materials: Firstly, we need to prepare the necessary raw materials, including soda ash (Na2CO3), ammonium molybdate [(NH4) 2MoO4], and water.
(2) Dissolution: Dissolve soda ash in water to obtain a sodium carbonate solution. Meanwhile, dissolve ammonium molybdate in water to obtain a solution of ammonium molybdate.
(3) Mixing: Mix sodium carbonate solution and ammonium molybdate solution together to obtain a mixed solution.
(4) Reaction: In a mixed solution, sodium carbonate and ammonium molybdate undergo a chemical reaction, producing sodium molybdate (Na2MoO4), ammonia (NH3), and carbon dioxide (CO2).
(5) Filtering: After the reaction is completed, the unreacted raw materials are filtered to obtain a sodium molybdate solution.
(6) Drying: Dry the sodium molybdate solution to obtain the solid state of sodium molybdate.
Chemical equation:
Na2CO3 + (NH4)2MoO4 + 2H2O → Na2MoO4 + 2NH3 + CO2 + 2H2O
In this reaction, sodium carbonate, ammonium molybdate, and water are all reactants. The molecular formula of sodium carbonate is Na2CO3, which is a strong base that can provide carbonate ions (CO32-). The molecular formula of ammonium molybdate is (NH4) 2MoO4, which is a salt containing molybdate ions (MoO42-). When sodium carbonate and ammonium molybdate are mixed, they undergo a double decomposition reaction, producing sodium molybdate (Na2MoO4), ammonia (NH3), carbon dioxide (CO2), and water (H2O). Ammonia and carbon dioxide are both gases, with ammonia having a pungent odor, while carbon dioxide can be used to prepare beverages such as soda. In this reaction, water is also discharged in a gaseous form.
Through this reaction, we can obtain high-purity sodium molybdate. During the reaction process, it is necessary to pay attention to controlling parameters such as reaction temperature and concentration to ensure the smooth progress of the reaction and obtain high-quality products. In addition, appropriate operations are also required during the filtration and drying process to avoid contamination or loss of the product.