无机材料学报 ›› 2021, Vol. 36 ›› Issue (6): 659-664.DOI: 10.15541/jim20200357
范君1(), 江雪2, 焦毅2(
), 陈宇圣1, 王健礼1(
), 陈耀强1,2
收稿日期:
2020-06-29
修回日期:
2020-09-17
出版日期:
2021-06-20
网络出版日期:
2020-10-10
通讯作者:
焦 毅, 教授. E-mail: jiaoyiscu@163.com; 王健礼, 教授. E-mail: wangjianli@scu.edu.cn
作者简介:
范 君(1996-), 女, 硕士研究生. E-mail: fj960117@163.com
FAN Jun1(), JIANG Xue2, JIAO Yi2(
), CHEN Yusheng1, WANG Jianli1(
), CHEN Yaoqiang1,2
Received:
2020-06-29
Revised:
2020-09-17
Published:
2021-06-20
Online:
2020-10-10
Contact:
JIAO Yi, professor. E-mail: jiaoyiscu@163.com; WANG Jianli, professor. E-mail: wangjianli@scu.edu.cn
About author:
FAN Jun (1996-), female, Master candidate. E-mail: fj960117@163.com
Supported by:
摘要:
老化处理会导致三效催化剂(TWCs)严重失活, 因此提高催化剂的耐久性能是TWCs设计的目标。本工作采用不同碱辅助的沉积沉淀法, 即尿素辅助沉积沉淀法和氨水辅助沉积沉淀法制备了Pt/Ce0.4Zr0.5La0.05Pr0.05O2 (Pt/CZ)三效催化剂, 分析了不同碱对催化剂物理化学性质、催化活性和耐久性的影响。结果表明, 尿素辅助沉积沉淀法(UDP)制备的Pt/CZ催化剂的抗老化性能较差, 而氨水辅助沉积沉淀法(ADP)制备的催化剂的抗老化能力较强。XRD, CO 吸附, XPS和H2-TPR表征结果表明, ADP中较大的Pt颗粒以及更强的金属载体相互作用使ADP在老化过程中烧结程度较低, 有利于维持催化活性。因此, ADP催化剂具有一定的工业应用前景。
中图分类号:
范君, 江雪, 焦毅, 陈宇圣, 王健礼, 陈耀强. 不同碱辅助的沉积沉淀法对三效催化剂稳定性的影响[J]. 无机材料学报, 2021, 36(6): 659-664.
FAN Jun, JIANG Xue, JIAO Yi, CHEN Yusheng, WANG Jianli, CHEN Yaoqiang. Effect of Different Alkali-assisted Deposition Precipitation Methods on the Durability of Three-way Catalysts[J]. Journal of Inorganic Materials, 2021, 36(6): 659-664.
Samples | Surface area/ (m2•g-1) | Pore volume/ (mL•g-1) | Average pore radius/nm |
---|---|---|---|
IM | 60 | 0.23 | 7.5 |
UDP | 63 | 0.22 | 7.5 |
ADP | 61 | 0.23 | 7.7 |
IM-a | 49 | 0.24 | 9.4 |
UDP-a | 50 | 0.22 | 7.6 |
ADP-a | 53 | 0.25 | 7.7 |
CZLP | 64 | 0.25 | 8.7 |
Table 1 Textural and structural parameters of the support and samples
Samples | Surface area/ (m2•g-1) | Pore volume/ (mL•g-1) | Average pore radius/nm |
---|---|---|---|
IM | 60 | 0.23 | 7.5 |
UDP | 63 | 0.22 | 7.5 |
ADP | 61 | 0.23 | 7.7 |
IM-a | 49 | 0.24 | 9.4 |
UDP-a | 50 | 0.22 | 7.6 |
ADP-a | 53 | 0.25 | 7.7 |
CZLP | 64 | 0.25 | 8.7 |
Fig. 1 XRD patterns of fresh and aged samples (a) and the comparison of their relative intensities of Pt (111) based on the strongest peak of support (b)
Sample | Pt0/Pt ratio | Pt2+/Pt ratio | Pt4+/Pt ratio | Oads/O ratio | Ce3+/Ce ratio |
---|---|---|---|---|---|
IM | 0 | 0.871 | 0.129 | 0.354 | 0.217 |
UDP | 0 | 0.851 | 0.149 | 0.374 | 0.240 |
ADP | 0 | 0.831 | 0.169 | 0.324 | 0.201 |
IM-a | 0.302 | 0.698 | 0 | 0.329 | 0.195 |
UDP-a | 0.421 | 0.579 | 0 | 0.350 | 0.187 |
ADP-a | 0.234 | 0.766 | 0 | 0.336 | 0.214 |
Table 2 Surface elemental state ratio derived from by XPS
Sample | Pt0/Pt ratio | Pt2+/Pt ratio | Pt4+/Pt ratio | Oads/O ratio | Ce3+/Ce ratio |
---|---|---|---|---|---|
IM | 0 | 0.871 | 0.129 | 0.354 | 0.217 |
UDP | 0 | 0.851 | 0.149 | 0.374 | 0.240 |
ADP | 0 | 0.831 | 0.169 | 0.324 | 0.201 |
IM-a | 0.302 | 0.698 | 0 | 0.329 | 0.195 |
UDP-a | 0.421 | 0.579 | 0 | 0.350 | 0.187 |
ADP-a | 0.234 | 0.766 | 0 | 0.336 | 0.214 |
Sample | CO | NO | C3H8 | C3H6 | ||||
---|---|---|---|---|---|---|---|---|
T50/℃ | ΔT /℃ | T50/℃ | ΔT/℃ | T50/℃ | ΔT/℃ | T50/℃ | ΔT/℃ | |
IM | 174 | - | 260 | - | 269 | - | 234 | - |
UDP | 142 | - | 259 | - | 273 | - | 228 | - |
ADP | 187 | - | 277 | - | 284 | - | 254 | - |
IM-a | 215 | 41 | 304 | 44 | 312 | 43 | 278 | 44 |
UDP-a | 229 | 87 | 313 | 54 | 328 | 55 | 287 | 59 |
ADP-a | 203 | 16 | 294 | 17 | 306 | 22 | 272 | 18 |
Table 3 Light-off (T50) temperature and ΔT for three-way catalytic reactions over catalysts
Sample | CO | NO | C3H8 | C3H6 | ||||
---|---|---|---|---|---|---|---|---|
T50/℃ | ΔT /℃ | T50/℃ | ΔT/℃ | T50/℃ | ΔT/℃ | T50/℃ | ΔT/℃ | |
IM | 174 | - | 260 | - | 269 | - | 234 | - |
UDP | 142 | - | 259 | - | 273 | - | 228 | - |
ADP | 187 | - | 277 | - | 284 | - | 254 | - |
IM-a | 215 | 41 | 304 | 44 | 312 | 43 | 278 | 44 |
UDP-a | 229 | 87 | 313 | 54 | 328 | 55 | 287 | 59 |
ADP-a | 203 | 16 | 294 | 17 | 306 | 22 | 272 | 18 |
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