Method for Synthesizing Ammonia, and Apparatus for Said Method
a technology of ammonia and ammonia nitride, which is applied in the direction of chemistry apparatus and processes, physical/chemical process catalysts, metal/metal-oxide/metal-hydroxide catalysts, etc., can solve the problems of increasing production costs, difficult storage and transportation of hydrogen, and the study of the above findings in a field other than the production of gallium nitride single crystals has not yet been well conducted
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example 1
[0066]In Example 1, ammonia was synthesized by the use of sodium (Na) as an alkali metal.
[0067]FIG. 3 is a schematic diagram of an apparatus for synthesizing ammonia, used in Example 1.
[0068]An apparatus 300 includes a crucible 310 which is made of boron nitride (a BN crucible) as a vessel for keeping at least sodium (Na) as an alkali metal, an electric tube furnace 320 as a heating means for heating the BN crucible 310, and a gas supplying means 330 for supplying a mixture of a hydrogen gas and a nitrogen gas to sodium. The gas supplying means 330 is connected to a cylinder (not shown) of the hydrogen gas and the nitrogen gas.
[0069]The BN crucible 310 is housed in a case 301 made of boron nitride, and the case 301 made of boron nitride is further housed in a quartz pipe 302. The quartz pipe 302 housing the BN crucible 310 is placed on a heat insulating material 303 and fixed with another heat insulating material 304 covering an upper part of the quartz pipe 302. The hydrogen gas an...
example 2
[0079]In Example 2, sodium (Na) was used as an alkali metal to synthesize ammonia using the same apparatus as in Example 1 except that in order to confirm the influence of evaporated sodium, a Na cold trap (not shown) for recovering vaporized Na was provided prior to the first recovery tank 350 (FIG. 3), and a methanesulfonic acid solution was stored in the second recovery tank 360. Further, ammonia was synthesized in the same conditions as in Example 1 except that the gas flow rate of the mixed gas was 200 sccm, the supplying time was 20 minutes, and the temperature was set at 500° C., 530° C., 560° C., 590° C., and 620° C. For simplicity, experimental conditions are shown in Table 2.
TABLE 2Conditions for synthesizing ammonia in Example 2HeatingPressureAlkalitemperatureHydrogen:Nitrogen(atmo-Conditionsmetal(° C.)(Volume ratio)spheres)Condition 1Na5004:961Condition 2Na5304:961Condition 3Na5604:961Condition 4Na5904:961Condition 5Na6204:961
[0080]The exhaust gas after bubbling was coll...
example 3
[0084]In Example 3, ammonia was synthesized in the same conditions as in Condition 3 of Example 2 using the same apparatus as in Example 2 except that the apparatus was provided with a stirring blade as the stirring means and a bubbler made of porous ceramics as the bubbling means. When a hydrogen gas and a nitrogen gas were supplied through the bubbler, a formation of fine bubbles was visually observed. When compared to Condition 3 of Example 2, a peak intensity of an NH4+ ion in Example 3 was increased (not shown).
[0085]Based on the above, it was demonstrated that ammonia can be synthesized at 1 atmosphere (atm), and also, setting the temperature range from higher than 530° C. to 600° C. or lower at the time of synthesizing can inhibit the production of an alkali metal hydride. Thus, it was demonstrated that, for example, ammonia can be synthesized without a specific high-pressure equipment used in the conventional method and the recovery tank for recovering an alkali metal hydrid...
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