NOx ADSORBER CATALYST
a technology of nox and adsorber, which is applied in the direction of physical/chemical process catalysts, other chemical processes, separation processes, etc., can solve the problems of inefficient storage function low efficiency of system below operating temperature, and deactivation of nosub>x /sub>adsorber catalysts
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example 1
[0160]Preparation of Al2O3PGM Ce
[0161]1.5 g / in3 Al2O3 is made into a slurry with distilled water and then milled to a d90 of 13-15 μm. To the slurry, 94 g / ft3 Pt malonate and 19 g / ft3 Pd nitrate solution is then added, and stirred until homogenous. The Pt / Pd is allowed to adsorb onto the Al2O3 support for 1 hour.
[0162]To this is then added 3 g / in3 high surface area ceria and 0.2 g / in3 alumina binder, and stirred until homogenous to form a washcoat.
[0163]The washcoat is then coated onto a ceramic or metallic monolith using standard procedures, dried at 100° C. and calcined at 500° C. for 45 mins.
[0164]The Ce is present at a loading of about 51.9 wt % (51.1 mol %).
example 2
[0165]Preparation of [Al2O3.La(13.0 wt %)] PGM Ce (10.7 mol % Al2O3.La)
[0166]Prepared as in Example 1, but using [Al2O3.La] (prepared according to general preparation (2) above).
[0167]The Ce is present at a loading of about 49.1 wt % (49.9 mol %) The La is present at a loading of about 4.6% (4.8 mol %).
example 3
[0168]Preparation of [Al2O3.La(26.6 wt %)] PGM Ce (24.9 mol % Al2O3.La)
[0169]Prepared as in Example 1, but using [Al2O3.La] (prepared according to general preparation (2) above).
[0170]The Ce is present at a loading of about 45.4 wt % (48.1 mol %) The La is present at a loading of about 10.8 wt % (11.5 mol %).
Experimental Results
[0171]Catalytic activity was determined using a synthetic gas bench test. The cores were tested in a simulated catalyst activity testing (SCAT) gas apparatus using the inlet gas mixture in Table 1. The test consisted of five cycles of 300 seconds lean / 16 seconds rich, at a space velocity (SV) of 40,000 h−1.
TABLE 1LeanRichO2 (%)120.9CO2 (%)610H2O (%)612NO (ppm)200100C3H6 (ppm as C1)5003000CO (ppm)150021000H2 (ppm)—7500
Results
[0172]The results from one representative cycle of the SCAT test are shown in Table 2 below.
TABLE 2TemperatureNOx conversion (%)(° C.)Example 1Example 2Example 315000017501618200153725250466448
[0173]From Table 2 it can be seen that Example...
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