Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 22, Pages 19335-19344Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b04100
Keywords
supported Ni catalysts; solid-state reaction; template-occluded mesoporous SiO2; gas phase Catalytic hydrodechlorination; 1,2-dichloroethane
Funding
- National Key Basic Research Program of China [2014CB441103]
- Natural Science Foundation [21577056, 21277066]
- Natural Science Foundation of Jiangsu Province [BK20150568, BK20151381]
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Supported Ni catalysts.on three mesoporous SiO2 supports (i,e.,SBA-15, MCM-41, and HMS) were prepared using a solid-state reaction between Ni(NO3)2 and organic template-occluded mesoporous SiO2. For comparison, supported Ni catalysts on mesoporous SiO2 synthesized by the conventional impregnation method were also included. The catalysts were characterized by scanning electron microscopy, X-ray diffraction, UV-vis diffuse reflectance spectroscopy, N-2 adsorption, X-ray photoelectron spectroscopy, H-2 temperature programmed reduction, transmission electron microscopy) and transmission electron microscopy-energy-dispersive X-ray. The catalytic properties of the catalysts were evaluated using gas-phase catalytic hydrodechlorination of 1,2-dichloroethane. The results showed that upon grinding Ni(NO3)(2) with template-occluded mesoporous SiO2, strong coordination between Ni2+ and dodecylamine was identified in the Ni(NO3)(2)-HMS system. Additionally, the results of H-2 temperature-programmed reduction revealed that NiO in calcined NiO/HMS was reduced at higher temperature than those in calcined NiO/SBA-15 and NiO/MCM-41, reflecting the presence of a strong interaction between NiO and mesoporous SiO2 in NiO/HMS, Consistently, the average particle sizes of metallic Ni were found to be 2.7, 3.4, and 9.6 nm in H-2-reduced Ni/HMS) Ni/SBA-15, and Ni/MCM-41, respectively, indicative of a much higher Ni dispersion in Ni/HMS. For the catalytic hydrodechlorination of 1,2-dichloroethane, Ni/MCM-41 synthesized by the solid-state reaction method exhibited a catalytic activity similar to that prepared by the impregnation method) while higher catalytic activities were observed on Ni/HMS and Ni/SBA-15-than On their counterparts prepared by the impregnation method. Furthermore, a higher conversion was identified on Ni/HMS than on Ni/SBA-15 and Ni/MCM-41, highlighting the importance of template type for the preparation of highly dispersed metal catalysts on mesoporous SiO2.
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