A method and application of nitrogen-modified chromium-containing leather scraps to prepare nitrogen-rich metal catalysts
A technology of metal catalysts and chrome leather shavings, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as nitrogen loss, achieve defect increase, efficient removal, and catalytic site density Increased effect
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Embodiment 1
[0035] Preparation and application of nitrogen-rich metal catalyst (Cr@N / BC).
[0036] (1) Add 30 parts of chromium-containing leather shavings to a three-necked flask with 350 mL of deionized water, soak for 10 hours to obtain a mixed solution; dissolve 3 parts of sodium formate and 2 parts of sodium bicarbonate in 100 ml of deionized water at the same time, add the mixed solution under stirring solution, reacted at 35°C for 3 hours to obtain a neutralized chromium-containing leather scrap mixture;
[0037] (2) Dissolve 25 parts of melamine retanning agent in 200 mL of deionized water, add it into the neutralized chromium-containing leather shavings mixture under stirring, and immediately add 8 ml of formic acid, react at 40 ° C for 2 hours, and then use ethanol Repeatedly washing the nitrogen-modified chromium-containing leather shavings in the retanning liquor with deionized water, and drying at 35°C to obtain nitrogen-modified chromium-containing leather shavings;
[0038...
Embodiment 2
[0044] Preparation and application of nitrogen-rich metal catalyst (Cr@N / BC).
[0045] (1) Put 10 parts of chrome-containing leather shavings into a three-necked flask and add 250 mL of deionized water, and soak for 8 hours to obtain a mixed solution; dissolve 2 parts of sodium formate and 1 part of sodium bicarbonate in 50 ml of deionized water at the same time, and add the mixture under stirring solution, reacted at 35°C for 3 hours to obtain a neutralized chromium-containing leather scrap mixture;
[0046] (2) Dissolve 20 parts of melamine retanning agent in 100 mL of deionized water, add it into the neutralized chromium-containing leather shavings mixture under stirring, and immediately add 5 ml of formic acid, react at 35 ° C for 1 hour, and then use ethanol Repeatedly washing the nitrogen-modified chromium-containing leather shavings in the retanning liquor with deionized water, and drying at 35°C to obtain nitrogen-modified chromium-containing leather shavings;
[0047...
Embodiment 3
[0051] Preparation and application of nitrogen-rich metal catalyst (Cr@N / BC).
[0052] (1) Put 20 parts of chromium-containing leather shavings into a three-necked flask and add 300 mL of deionized water, and soak for 12 hours to obtain a mixed solution; dissolve 3 parts of sodium formate and 2 parts of sodium bicarbonate in 70 ml of deionized water at the same time, add the mixed solution under stirring solution, reacted at 35°C for 3 hours to obtain a neutralized chromium-containing leather scrap mixture;
[0053] (2) Dissolve 30 parts of melamine retanning agent in 150 mL of deionized water, add it into the neutralized chromium-containing leather shavings mixture under stirring, and immediately add 6 ml of formic acid, react at 35 ° C for 1 hour, and then use ethanol Repeatedly washing the nitrogen-modified chromium-containing leather shavings in the retanning liquor with deionized water, and drying at 35°C to obtain nitrogen-modified chromium-containing leather shavings; ...
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