Catalytic Control of Air Pollution: Mobile and Stationary by Ronald G. Silver, John E. Sawyer, Jerry C. Summers

By Ronald G. Silver, John E. Sawyer, Jerry C. Summers

Explores the chemistry of catalyst platforms used to regulate pollution from cellular and desk bound resources. provides fresh catalytic advancements for the remedy of either car and business pollution. additionally experiences contemporary emission regulate laws. useful examining for chemical engineers and chemists within the automobile, chemical, and petroleum industries, in addition to environmental scientists.

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Chem. Prod. Res. Dev. 1972, 11, 54. ; J. Catal. 1977, 49, 42. ; ACS Symposium Series 1982, 178, 143. ; SAE 1978, Paper 780624. ; "Poisoning of Monolithic Noble Metal Oxidation Catalysts in Automobile Exhaust Environment", 74th National Meeting of AIChE, New Orleans, March 1973. ; SAE Transactions 1979, 88, 3196 (Paper 790942). ; SAE 1990, Paper 900708. ; SAE 1987, Paper 872130. ; SAE 1989, Paper 892093. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1992. Bart , A. Pentenero , and M.

Ch003 3. TIME (SEC) Figure 8. Effect of vehicle system on the time required for HC light-off to occur for a Pt/Rh catalyst after engine aging (850 C inlet fuel-cut cycle). (Reproduced with permission from ref. 11. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1992. 2(99+) (ND » Not Detected) TABLE 4 HC FTP PHASE SENSITIVITY TO VEHICLE SYSTEM OF HIGH-TECH TWC a Vehicle % HC C o n v e r s i o n (Phase Avg. C a t a l y s t I n l e t T Total CT (T°C)" CS (T°cT ; °C) HT Scirocco 84 72 (506) 91 (488) Somerset 81 72 (435) 89 (410) Citation 72 68 (408) 77 (372) 300ZX 63 36 (341) 81 (367) (T CI 0 81 (500) 73 (405) 62 (392) 61 (362) a = TWC aged lOOh 850°C Fuel-Cut C y c l e Reprinted with permission from ref.

Finally, the role played bySO in hydrocarbon conversion was evaluated. e. e. in stoichiometric and lean conditions for acetylene and for hydrocarbons for which oxidation starts below 200°C (olefins, aromatics and alkanes with more than 3 carbon atoms), and in rich conditions for all kinds of hydrocarbons. 2 2 2 2 2 Several hundred different hydrocarbons and oxygenated compounds can be detected in engine exhaust gases (i-5). Some come directly from the fuel. Others, initially not present, are synthesized from hydrocarbon fragments during the combustion and/or exhaust strokes.

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