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Materials 2021, 14, 6843 6 of 15 obtained using the spent autocatalyst alone, an increase in weight was observed over two temperature regions: the initial temperature to 180 ◦C and 560 ◦C to 770 ◦C. Although the weight decreased from 180 ◦C to 560 ◦C and above 770 ◦C, in all situations, the maximum change in weight was approximately ±0.2%. A very subtle peak attributed to an endothermic reaction close to 777 ◦C was also observed. In contrast, the weight of the sample containing Li2CO3 (Figure 3b) decreased by 5% between 545 ◦C and 735 ◦C; the endothermic peak observed at 720 ◦C was attributed to the melting of Li2CO3 (m.p. Materials 2021, 14, x FOR PEER REVIEW ◦ 7 of 16 Li2CO3 = 723 C) [30]. The exothermal reaction due to the formation of complex oxides could not be observed because the small amount of PGMs precluded detection. Fiigurree33..TThheermrmooggrarvaivmimeterticri–cd–idffiefrfenretinatliathletrhmeraml anlalnyasilsys(TisG(–TDGT–AD)TpAro)fiplerosfoilfesaomfpslaems opbletasinoebdtained usiing(a(a))ththeespsepnetnatuatuotcoactaltyaslyt satloanloenaendan(bd)(tbh)etshpenstpaeuntoacuataolcyastawlyistthwLithCOLi2.CSOol3i.dSloinlieds:liTnGes: TG 23 tion (condition I-A) and after calcination at 800 ◦C for 3 h (condition I-B). In both profiles, tion (condition I-A) and after calcination at 800 °C for 3 h (condition I-B). In both profiles, curves; dashed lines: DTA curves. curves; dashed lines: DTA curves. Figure 4a,b show the XRD profiles obtained for the spent autocatalyst before calcina- Figure 4a,b show the XRD profiles obtained for the spent autocatalyst before calcina- diffraction peaks corresponding to cordierite were observed. Furthermore, the enlarged diffraction peaks corresponding to cordierite were observed. Furthermore, the enlarged image shown in Figure 4c indicates that the diffraction between 10◦ and 11◦ shifted toward image shown in Figure 4c indicates that the diffraction between 10° and 11° shifted toward a higher angle following calcination. As this peak originated from the 100 diffraction of a higher angle following calcination. As this peak originated from the 100 diffraction of cordierite, this observation indicates that calcination reduced the a-axis lattice constant. In cordierite, this observation indicates that calcination reduced the a-axis lattice constant. In addition, as shown in Figure 4c–e, new peaks were detected between 26.5◦ and 27◦, and addition, as shown in Figure 4c–e, new peaks were detected between 26.5° and 27°, and between 34◦ and 34.5◦ after calcination. Despite their low peak intensities, these findings between 34° and 34.5° after calcination. Despite their low peak intensities, these findings suggest the generation of trace amounts of new compounds. suggest the generation of trace amounts of new compounds.PDF Image | Recovery of Platinum Group Metals from Auto Catalysts
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