Cu-SSZ-13/SiC-waste Composite: Synthesis and Application for NH3-SCR

doi:10.15541/jim20180536

Abstract

Abstract:

Solar cell wafer cutting process produces a lot of silicon carbide-based waste named HT-SiC. Herein, we developed a novel catalyst through a one-pot hydrothermal process combined with an ion-exchange method to synthesize Cu-SSZ-13/HT-SiC composite and applied in denitration catalytic reaction. TMAdaOH and Cu-TEPA were used as templates to prepare the precursor for Cu-SSZ-13, respectively. Results showed that, with participation of HT-SiC, SSZ-13 crystal was successfully obtained by using TMAdaOH template, while it would get only amorphous structure by using Cu-TEPA template. NH₃-SCR(Selective Catalytic Reduction, SCR) exhibited catalytic activity and stability of Cu-SSZ-13/HT-SiC in medium and high temperature zones was more effective than those of Cu-SSZ-13 without HT-SiC, and NO consumption by the former was about 11-fold of the latter at 500 ℃. Moreover, compared with Cu-SSZ-13/α-SiC catalyst prepared with pure SiC (α-SiC), Cu-SSZ-13/HT-SiC shows better catalytic activity in the whole temperature range. These favorable performances are attributed not only to the good thermal conductivity and thermal stability of SiC, but also to the 7.34wt% Fe component contained in HT-SiC, which acts as an active site for reducing NO in NH₃-SCR. This method not only provides a way to reuse the SiC waste, but also enhances denitrification activity of Cu-SSZ-13 in medium and high operating temperature.

Key words: SSZ-13, composite, silicon carbide waste, NH₃-selective catalytic reduction (NH₃-SCR)

CLC Number:

X705

LUO Qing,YUAN Qing,JIANG Qian-Qin,YU Nai-Sen. Cu-SSZ-13/SiC-waste Composite: Synthesis and Application for NH₃-SCR[J]. Journal of Inorganic Materials, 2019, 34(9): 953-960.

Figures/Tables 9

Fig. 1 XRD patterns of HT-SiC and SSZ-13/HT-SiC composites synthesized by using (a) TMAdaOH and (b) Cu-TEPA as template

Fig. 2 SEM images of HT-SiC and SSZ-13/HT-SiC composites synthesized by using TMAdaOH as template with insets showing corresponding partiesize distributions

Fig. 3 SEM images of pure Cu/SSZ-13 and Cu/SSZ-13/HT-SiC composites prepared by using Cu-TEPA as template

Fig. 4 N2 adsorption/desorption isotherms of pure SSZ-13, HT-SiC and SSZ-13/HT-SiC composites

Table 1 Textural properties of HT-SiC support, SSZ-13 and SSZ-13/HT-SiC composites

Sample	S_BET/(m²·g^-1)	S_mic/(m²·g^-1)	S_ext/(m²·g^-1)	V_t/(cm³·g^-1)^a	V_mic/(cm³·g^-1)^b
HT-SiC	0.5	0.4	0.006	-	-
SSZ-13	567.7	560.1	7.600	0.31	0.30
SSZ-13/HT-SiC-0.4 g	0.9	0.8	0.010	-	-
SSZ-13/HT-SiC-0.6 g	226.5	223.4	3.000	0.12	0.11
SSZ-13/HT-SiC-0.8 g	378.5	373.4	5.100	0.21	0.20
SSZ-13/HT-SiC-1.0 g	355.7	350.9	4.800	0.19	0.18

Fig. 5 Thermal conductivity of HT-SiC, SSZ-13/HT-SiC-0.8 g composite and pure SSZ-13

Fig. 6 (a) Denitrification activity of HT-SiC, Cu-SSZ-13 and Cu-SSZ-13/HT-SiC catalysts synthesized by using TMAdaOH or Cu-TEPA as template with different Cu contents; (b) The mole of NO consumed (molNO/(gCu·min)) by Cu(1)-SSZ-13/HT-SiC, Cu(4)-SSZ-13 and Cu(5)/SSZ-13 catalysts

Fig. 7 Thermal stability of Cu(1)-SSZ-13/HT-SiC, Cu(5)/SSZ-13 and Cu(4)-SSZ-13 catalysts

Fig. 8 N2 adsorption/desorption isotherms of Cu(1)-SSZ-13/HT-SiC and Cu(4)-SSZ-13 catalysts after three-cycle NH3-SCR test

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Cu-SSZ-13/SiC-waste Composite: Synthesis and Application for NH₃-SCR

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