Mixed metal oxide catalysts for ammonia decomposition
An oxide and catalyst technology, applied in the system field of ammonia decomposition catalyst, can solve the problems of infeasibility and poor catalyst performance.
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Embodiment 1
[0042] Example 1. Preparation of cobalt-containing catalyst
[0043] The co-precipitation method is used to prepare cobalt-containing mixed metal oxide compounds.
[0044] In an exemplary method, the precursor solution is obtained by dissolving the purity grade nitrate of the corresponding metal in distilled water: 2.47g Co(NO 3 ) 2 6H 2 O, 18.7g Mg(NO 3 ) 3 , 10.4g Al(NO 3 ) 3 And 2.238g La(NO 3 ) 3 . A solution of 0.1M NaOH used as a precipitant was prepared.
[0045] The metal salt solution is mixed to form a first solution. This produces a mixed Co, Al, La and Mg metal salt solution.
[0046] Put a certain volume of distilled water into a beaker, heat to 65°C and adjust the pH with 0.1M NaOH to reach pH=8.0. This is called the second solution. The first solution (mixed Co, Al, La and Mg metal salt solutions) and the precipitate are simultaneously introduced into the second solution under vigorous stirring. Obtain a slurry. The resulting slurry was aged in mother liquor for 2...
Embodiment 2
[0047] Example 2. Test for catalytic activity for ammonia decomposition
[0048] A test of a catalyst for decomposing ammonia into hydrogen and nitrogen was performed in a Microactivity-Reference (PID Eng&Tech, Madrid, Spain). A 0.5-1.0 g sample with a particle size of 125-250 μm was introduced into a quartz reactor (ID 6.0 mm) and activated with pure hydrogen flow at 600° C. for 5 h. After the reduction process is completed, the reactor temperature is lowered to 350°C and passed through for 1200h -1 The gas hourly space velocity (GHSV) replaces the hydrogen stream with a pure ammonia stream. Change the reaction temperature between 350°C and 600°C.
[0049] The inlet and outlet gases of the reactor were analyzed by a gas chromatograph (GC-450Varian, USA) equipped with a thermal conductivity detector and a Poropak Q column connected online.
[0050] in figure 1 In, the experimental data of the catalytic property test of the catalyst prepared in Example 1 in the ammonia decomposition...
Embodiment approach 1
[0055] Embodiment 1. A method for preparing a catalyst for ammonia decomposition, the method comprising: providing a first solution comprising: selected from cobalt soluble salt, nickel soluble salt, iron soluble salt and combinations thereof First metal soluble salt; second metal soluble salt selected from magnesium soluble salt, calcium soluble salt, strontium soluble salt, barium soluble salt and combinations thereof; selected from lanthanide soluble salt and combinations thereof And optionally, a fourth metal soluble salt selected from aluminum soluble salts, transition metal soluble salts, alkali metal soluble salts and combinations thereof; between about 6.0 and about 11.0 Co-precipitating the first metal oxide, the second metal oxide, the third metal oxide, and the optional fourth metal oxide from the first solution at pH to form a hydrotalcite-like structure material; and decompose the hydrotalcite-like structure Material to form a catalyst.
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