Protection agent composition and method for fuel-lean discharge system
A technology for an emission system and an emission control system, which is applied in the field of protecting a lean-burn catalytic-based emission control system and can solve problems such as unfavorable reduction reactions
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[0031] The preparation of such compounds is described in the literature, for example, US Patent 2818417, the disclosure of which is incorporated herein by reference in its entirety.
[0032] When preparing the fuel compositions of the present invention, sufficient amounts of organometallic compounds (such as cyclopentadienyl manganese tricarbonyl compounds) are used to reduce the emission of harmful substances, such as sulfur, lead and phosphorus, to lean operating fuel burning engines The influence of the control system. Thus, the fuel will contain enough X Small amounts of organometallic compounds affect such deposits in traps and other low temperature or catalyst-lean systems. Generally, the fuels of the present invention will contain an amount of organometallic compound sufficient to provide from about 0.5 to about 120 mg of metal per liter of fuel, and preferably from about 1 to about 66 mg of manganese per liter, more preferably about 1 mg per liter of fuel. 2 to about...
Embodiment 1
[0039] Two cars equipped with diesel engines and oxidation catalysts were tested for 80,000 km. A car runs on diesel fuel. Another vehicle used diesel fuel containing organometallic additives in amounts sufficient to provide the fuel with 17 ppm calcium and 3 ppm manganese. At the end of the mileage rollup, both catalysts were removed from the vehicle and the elemental content of the catalysts was estimated. As shown in Figure 1, catalysts taken from cars run on fuel containing organometallic scavengers contained lower amounts of sulfur. This demonstrates that the use of organometallic compounds scavenges sulfur and prevents its deposition on the catalyst.
Embodiment 2
[0041] Other catalyst poisons were determined in the same diesel catalyst as shown in Table 1 below. Catalysts taken from engines operating according to the invention were found to contain lower amounts of phosphorus and lead than catalysts taken from cars running on base fuel. This scavenging effect of P and Pb has not been observed in engines operating at significantly higher than stoichiometric air or in diesel engine applications. The presence of P and Pb in the catalyst will reduce the catalyst activity; therefore, the removal of these compounds by additives will provide longer catalyst durability.
[0042] Table 1 Catalyst poison content (ppm)
[0043] Basic Fuel Fuel+Organometallic Scavenger
[0044] Catalyst Pb P S Catalyst Pb P S
[0045] Front 22 4756 2344 Front 19.6 1565 812
[0046] Central 24 4375 2518 Central 12.8 1294 331
[0047] Exports 20.9 4303 1812 Exports 16.6 1046 1586
[0048] Rear 26 4246 2683 Rear 16.1 1379 1623
[0049] Central 25 2094 2543 Cen...
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