Preparation of transition metal substituted hexaaluminate as catalyst for natural gas combustion

Abstract

A transition metal (Fe, Co, Ni, Cu, Mn, Ti or Zr) substituted hexaluminate used as the combustion catalyst of natural gas is prepared from nitrate, chloride or acetate through preparing the hexaluminate, substituting and calcining at 1200 deg.C for 4 hr. Its advantages are high specific surface area and stability, low pollution to air, and no deactivation.

Description

Technical field

[0001] The invention relates to the technical field of natural gas combustion catalysts, and relates to the composition and preparation method of a hexaaluminate type natural gas catalytic combustion catalyst. The developed catalyst can improve the utilization efficiency of natural gas, and can operate stably and safely under high-temperature hydrothermal conditions for a long time, effectively reducing Carbon monoxide (CO) in the combustion exhaust gas, incomplete combustion of hydrocarbon compounds (UHC s ) Emissions, especially nitrogen oxides (No x ) Achieve ultra-low or even zero emissions. Background technique

[0002] In the 21st century, natural gas will become the world's largest energy source. As an important chemical raw material to replace coal and petroleum in the future, the current research on natural gas mainly involves high-temperature catalytic reactions such as methane catalytic combustion, oxidative coupling, catalytic reforming, and partial ox...

Examples

example 1

[0038] Example 1. Using the above co-precipitation method to prepare Ba 1-x La x Fe y Al 12-y O 19-δ :

[0039] Configuration series stoichiometric Fe(NO 3 ) 3 And Al(NO 3 ) 3 , La(NO 3 ) 3 , Ba(NO 3 ) 2 Mix the solution, dilute nitric acid to adjust the pH = 1 or so, and configure the saturated (NH 4 ) 2 CO 3 Solution. Pour the mixed salt solution quickly into saturated (NH 4 ) 2 CO 3 The solution is stirred vigorously, the temperature of the system is controlled at 60°C, and the pH value is controlled at 7.5-8.0. The resulting brown slurry is continuously stirred vigorously for 2 hours and aged at 60°C for 3 hours; washed to remove NO 3 - The resulting filter cake is dried at 60°C and dried at 120°C. The above samples were fired at 500°C, 800°C, 1100°C, and 1200°C for 3h. Label the resulting catalysts as BF i A n -t, where A, B, F, I, t respectively represent aluminum (Al), barium (Ba), iron (Fe) atoms, i represents the number of iron (Fe) atoms, and n represents the number of ...

example 2

[0042] Example 2. Preparation of Ba by the above co-precipitation-hydrothermal method 1-x La x Fe y Al 12-y O 19-δ :

[0043] Configuration series stoichiometric Fe(NO 3 ) 3 And Al(NO 3 ) 3 , Ba(NO 3 ) 2 Mix the solution, dilute nitric acid to adjust the pH = 1 or so, and configure the saturated (NH 4 ) 2 CO 3 Solution or saturated urea solution. Pour the mixed salt solution quickly into saturated (NH 4 ) 2 CO 3 Solution or excess saturated urea solution, stir vigorously, the temperature of the system is controlled at 60℃, the pH value is controlled at 7.5-8.0, the brown slurry obtained is aged at 60℃ for 3h, and then transferred to the reactor for treatment at 120℃ for 3h; the resulting precipitate is washed Remove NO 3 - The resulting filter cake was dried at 120°C. The above samples were fired at 500°C, 800°C, 1100°C, and 1200°C for 3h. Label the resulting catalysts as BF i A n -t, where A, B, F, I, t respectively represent aluminum (Al), barium (Ba), iron (Fe) atoms, i repres...

example 3

[0044] Example 3. Preparation of Ba using the above hydrothermal method 1-x La x Fe y Al 12-y O 19-δ :

[0045] Configuration series stoichiometric Fe(NO 3 ) 3 And Al(NO 3 ) 3 , Ba(NO 3 ) 2 Mix the solution, dilute nitric acid to adjust the pH = 1 or so, and configure the saturated (NH 4 ) 2 CO 3 Solution or saturated urea solution. Pour the mixed salt solution quickly into saturated (NH 4 ) 2 CO 3 Solution or excess saturated urea solution, stir vigorously, the temperature of the system is controlled at 60℃, the pH value is controlled at 7.5-8.0, the resulting brown slurry is transferred to the reactor at 120℃ for 3h; the resulting precipitate is washed to remove NO 3 - The resulting filter cake is dried at 60°C and dried at 120°C. The above samples were fired at 500°C, 800°C, 1100°C, and 1200°C for 3h. Label the resulting catalysts as BF i A n -t, where A, B, F, I, t respectively represent aluminum (Al), barium (Ba), iron (Fe) atoms, i represents the number of iron (Fe) atoms, ...

Technical field

[0001] The invention relates to the technical field of natural gas combustion catalysts, and relates to the composition and preparation method of a hexaaluminate type natural gas catalytic combustion catalyst. The developed catalyst can improve the utilization efficiency of natural gas, and can operate stably and safely under high-temperature hydrothermal conditions for a long time, effectively reducing Carbon monoxide (CO) in the combustion exhaust gas, incomplete combustion of hydrocarbon compounds (UHC s ) Emissions, especially nitrogen oxides (No x ) Achieve ultra-low or even zero emissions. Background technique

[0002] In the 21st century, natural gas will become the world's largest energy source. As an important chemical raw material to replace coal and petroleum in the future, the current research on natural gas mainly involves high-temperature catalytic reactions such as methane catalytic combustion, oxidative coupling, catalytic reforming, and partial ox...

Examples

example 1

[0038] Example 1. Using the above co-precipitation method to prepare Ba 1-x La x Fe y Al 12-y O 19-δ :

[0039] Configuration series stoichiometric Fe(NO 3 ) 3 And Al(NO 3 ) 3 , La(NO 3 ) 3 , Ba(NO 3 ) 2 Mix the solution, dilute nitric acid to adjust the pH = 1 or so, and configure the saturated (NH 4 ) 2 CO 3 Solution. Pour the mixed salt solution quickly into saturated (NH 4 ) 2 CO 3 The solution is stirred vigorously, the temperature of the system is controlled at 60°C, and the pH value is controlled at 7.5-8.0. The resulting brown slurry is continuously stirred vigorously for 2 hours and aged at 60°C for 3 hours; washed to remove NO 3 - The resulting filter cake is dried at 60°C and dried at 120°C. The above samples were fired at 500°C, 800°C, 1100°C, and 1200°C for 3h. Label the resulting catalysts as BF i A n -t, where A, B, F, I, t respectively represent aluminum (Al), barium (Ba), iron (Fe) atoms, i represents the number of iron (Fe) atoms, and n represents the number of ...

example 2

[0042] Example 2. Preparation of Ba by the above co-precipitation-hydrothermal method 1-x La x Fe y Al 12-y O 19-δ :

[0043] Configuration series stoichiometric Fe(NO 3 ) 3 And Al(NO 3 ) 3 , Ba(NO 3 ) 2 Mix the solution, dilute nitric acid to adjust the pH = 1 or so, and configure the saturated (NH 4 ) 2 CO 3 Solution or saturated urea solution. Pour the mixed salt solution quickly into saturated (NH 4 ) 2 CO 3 Solution or excess saturated urea solution, stir vigorously, the temperature of the system is controlled at 60℃, the pH value is controlled at 7.5-8.0, the brown slurry obtained is aged at 60℃ for 3h, and then transferred to the reactor for treatment at 120℃ for 3h; the resulting precipitate is washed Remove NO 3 - The resulting filter cake was dried at 120°C. The above samples were fired at 500°C, 800°C, 1100°C, and 1200°C for 3h. Label the resulting catalysts as BF i A n -t, where A, B, F, I, t respectively represent aluminum (Al), barium (Ba), iron (Fe) atoms, i repres...

example 3

[0044] Example 3. Preparation of Ba using the above hydrothermal method 1-x La x Fe y Al 12-y O 19-δ :

[0045] Configuration series stoichiometric Fe(NO 3 ) 3 And Al(NO 3 ) 3 , Ba(NO 3 ) 2 Mix the solution, dilute nitric acid to adjust the pH = 1 or so, and configure the saturated (NH 4 ) 2 CO 3 Solution or saturated urea solution. Pour the mixed salt solution quickly into saturated (NH 4 ) 2 CO 3 Solution or excess saturated urea solution, stir vigorously, the temperature of the system is controlled at 60℃, the pH value is controlled at 7.5-8.0, the resulting brown slurry is transferred to the reactor at 120℃ for 3h; the resulting precipitate is washed to remove NO 3 - The resulting filter cake is dried at 60°C and dried at 120°C. The above samples were fired at 500°C, 800°C, 1100°C, and 1200°C for 3h. Label the resulting catalysts as BF i A n -t, where A, B, F, I, t respectively represent aluminum (Al), barium (Ba), iron (Fe) atoms, i represents the number of iron (Fe) atoms, ...

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