Mg–Al hydrotalcite-supported Pd catalyst for low-temperature CO oxidation: effect of Pdn+ species and surface hydroxyl groups

2018 ◽  
Vol 47 (42) ◽  
pp. 14938-14944 ◽  
Author(s):  
Xingyi Lin ◽  
Jianke Zhou ◽  
Yanyu Fan ◽  
Yingying Zhan ◽  
Chongqi Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Hydroxyl Groups ◽  
Pd Catalyst ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Low Temperature Co Oxidation ◽  
Oxidation Effect ◽  
Supported Pd

HTlcs is demonstrated as an alternative support for Pd-based catalyst in low temperature CO oxidation due to its unique characteristics.

TiO2-nanosheet-assembled microspheres as Pd-catalyst support for highly-stable low-temperature CO oxidation

2018 ◽  
Vol 42 (22) ◽  
pp. 18066-18076 ◽  
Author(s):  
Xuefeng Zhai ◽  
Chengwei Liu ◽  
Qiang Chang ◽  
Chunqiu Zhao ◽  
Rui Tan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Catalyst Support ◽  
Pd Catalyst ◽  
Low Temperature Co Oxidation

The Pd-embedded-in-TiO2 structure could improve the activity and stability of the Pd/TiO2 catalyst.

Mesoporous Co3O4 for Low Temperature CO Oxidation: Effect of Calcination Temperatures on Their Catalytic Performance

2011 ◽  
Vol 11 (5) ◽  
pp. 3843-3850 ◽  
Author(s):  
Hongjing Wang ◽  
Yonghong Teng ◽  
Logudurai Radhakrishnan ◽  
Yoshihiro Nemoto ◽  
Masataka Imura ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Catalytic Performance ◽  
Calcination Temperatures ◽  
Low Temperature Co Oxidation ◽  
Oxidation Effect

Raman Spectroscopy of the Kaolinite Hydroxyls at 77 K

1998 ◽  
Vol 52 (10) ◽  
pp. 1277-1282 ◽  
Author(s):  
Ursula Johansson ◽  
Ray L. Frost ◽  
Willis Forsling ◽  
J. Theo Kloprogge
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Low Temperature ◽  
Liquid Nitrogen Temperature ◽  
Hydroxyl Groups ◽  
Frequency Shifts ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Inner Surface ◽  
Raman Microprobe

Raman spectroscopy of two types of kaolinites has been obtained at liquid nitrogen temperature (77 K) with the use of a Raman microprobe and a thermal stage. The Raman spectrum is characterized by the combination of the frequencies of the inner hydroxyl and the inner surface hydroxyl groups. The inner hydroxyl frequency is reduced, and the outer hydroxyl frequencies move to higher frequencies upon cooling to 77 K. The inner hydroxyl frequency shifts from 3620 cm−1 at 298 K to 3615 cm−1 at 77 K. The two in-phase inner surface hydroxyl frequencies move from 3684 and 3689 cm−1 at 298 K to 3690 and 3699 cm−1 at 77 K. The two out-of-phase vibrations shift from 3650 and 3668 cm−1 to 3656 and 3675 cm−1. The bandwidth of the inner hydroxyl frequency decreases from 3.7 to 2.1 cm−1 at 77 K. The bandwidth of the inner surface hydroxyl frequency ( v1) increases upon cooling from 17.4 to 19.2 cm−1. It is proposed that the increased resolution at low temperature enabled an additional inner surface hydroxyl frequency to be observed.

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