NO AND C OXIDATION WITH Pt RECOVERED FROM SPENT CATALYTIC CONVERTERS
Several powder samples, obtained from a spent catalytic converter containing about 1,1％ w/w of Pt/PtO, have been submitted to a leaching procedure at 25 ℃, 80 ℃, 100 ℃. Leached powder samples have been characterized by XRF showing that recovered amount of Pt/PtO increased by increasing the temperature, reaching about 90％ of recovering of Pt/PtO at 100 ℃. In a second step, the leached solution processed at 100℃, has been treated in an ion exchange column with two strongly basic resins: Amberlite-IRA 400 and 900, constituted respectively by gel and macroreticular styrene-divinylbenzene matrix. The aim of this second stage is to eliminate the impureness deriving from the first stage. The Pt/PtO recovering resulted better when the process is carried out with the resin having macroreticular matrix, reaching a global Pt/PtO recovering yield next to 90 ％. Two 2wt％ Pt/Al2O3 catalyst powder samples have been synthesized via incipient wetness impregnation; the first sample has been prepared by using the recovered platinum, whereas the second one has been prepared by using an aqueous solution of hydrogen hexachloroplatinate (Ⅳ). The activity of these catalysts towards the carbon and NO oxidation carried out in a TPC plant, gave Tp values (peak temperature) for the soot oxidation of 555 ℃ and 560 ℃ respectively for the “virgin Pt, and “recovered Pt catalyst. Shifting our attention towards the NO oxidation to NO2, both catalysts showed a similar performance, reaching the highest conversion (～61％) at 310℃ with no production of nitrous oxide.
catalytic converter platinum recovering soot and NO oxidation spent catalyst
J.C. CAROCA J.P. CICORIA D. FINO P. PALMISANO N.RUSSO
Department of Materials Science and Chemical Engineer, Politecnico di Torino.Corso Duca degli Abruzzi 24, 10139 Torino , Italy
国际会议
北京
英文
567-572
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）