Monolithic catalyst for methane catalytic combustion and preparation method thereof
A monolithic catalyst, methane catalytic combustion technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the difficulty of accurately controlling the loading of precious metals and waste of resources , the solution is not easy to recycle, etc., to achieve the effect of high methane catalytic combustion activity, smooth appearance, and less precious metal consumption
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Embodiment 1
[0041] The preparation of palladium sol takes palladium nitrate and citric acid as raw materials, and dilute nitric acid and distilled water as solvents.
[0042] The preparation steps are as follows:
[0043] (1) Weigh 100mg of Pd(NO 3 ) 2 ﹒ 2H 2 O was dissolved in 15ml of 10% dilute nitric acid by volume fraction to obtain solution A.
[0044] (2) Weigh 200 mg of citric acid and dissolve it in 10 ml of water to obtain solution B.
[0045] (3) Mix solution A prepared in step (1) with solution B prepared in step (2), add concentrated NH 3 ﹒ 2H 2 O mass fraction (25%~28%) to pH 6~8 and stir evenly.
[0046] (4) The solution obtained in step (3) was heated to 60° C. in a constant temperature water bath and kept for 2 hours to obtain a transparent sol.
Embodiment 2
[0048] The preparation of the palladium sol takes palladium acetate and citric acid as raw materials, and glacial acetic acid and distilled water as solvents.
[0049] The preparation steps are as follows:
[0050] (1) Weigh 120.8mg of Pd(CH 3 COO) 2 ﹒ 2H 2 O was dissolved in 15ml of glacial acetic acid and heated to obtain cloudy liquid A.
[0051] (2) Weigh 170.3 mg of citric acid and dissolve it in 10 ml of water to obtain solution B.
[0052] (3) Mix the turbid solution A prepared in step (1) with the solution B prepared in step (2), and add concentrated NH 3 ﹒ 2H 2 O (mass fraction 25% to 28%) until the pH is 6 to 8 and stirred evenly.
[0053] (4) The solution obtained in step (3) was heated to 70° C. in a constant temperature water bath and kept for 2 hours to obtain a transparent sol.
Embodiment 3
[0055] The preparation of palladium sol takes palladium chloride and citric acid as raw materials, and n-butanol, concentrated hydrochloric acid and distilled water as solvents.
[0056] The preparation steps are as follows:
[0057] (1) Weigh 159.8mg of PdCl 2 Dissolve in 15ml of n-butanol, add 10ml of concentrated hydrochloric acid dropwise and heat to obtain solution A.
[0058] (2) Weigh 500.4 mg of citric acid and dissolve it in 10 ml of n-butanol to obtain solution B.
[0059] (3) Mix solution A prepared in step (1) with solution B prepared in step (2), add concentrated NH 3 ﹒ 2H 2 O (mass fraction 25% to 28%) until the pH is 6 to 8 and stirred evenly.
[0060] (4) The solution obtained in step (3) was heated to 60° C. in a constant temperature water bath and kept for 2 hours to obtain a transparent sol.
[0061] (5) Dry the sol obtained in step (4) at 100° C. for several hours to form a wet gel, and heat-treat at 400° C. for 1 hour to obtain dry rubber powder.
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