NDLI: Transition metal-rich mesoporous silicas and their enhanced catalytic properties

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Catalysis Science & Technology Vol - 4 Issue - 9

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Transition metal-rich mesoporous silicas and their enhanced catalytic properties

Content Provider	Royal Society of Chemistry (RSC)
Author	Kawamoto, Katsuya Lu, Baowang
Copyright Year	2014
Abstract	A controllable and simple direct hydrothermal synthesis route was designed for synthesizing well-ordered mesoporous silica incorporating transition metals (M) (Ni, Cu, Zn, Co) with high metal loading. M-incorporated mesoporous silica could be obtained from a starting synthesis mixture with a Si/M mole ratio of 5 using transition metal–ammonia (NH3) complex ions [M(NH3)x]n+ as base. The Si/M mole ratio of 5 is the lowest value yet reported. XPS, UV-vis and H2-TPR analyses demonstrated that a chemical bond was formed between metal and silicon via oxygen and no bulk metal oxides existed in any of the M-MCM-41 samples; in other words, only tetrahedral coordinated metal species were detected. The formation of –O–M–O–Si–O– is completed via the reaction between hydrolyzate [M(OH)(NH3)x−1](n−1)+ from [M(NH3)x]n+ and Si–OH (silanol sites) from a silica source (tetramethoxysilane (TMOS)). All the M-MCM-41 samples possessed remarkable physical properties and thermal stability. Ni-MCM-41, Cu-MCM-41 and CoMCM-41 catalysts exhibited excellent catalytic efficiency for carbon dioxide (CO2) hydrogenation, although Zn-MCM-41 catalyst did not. Ni-MCM-41 catalyst suited methanation, resulting in high CO2 conversion rate and methane selectivity, while Cu-MCM-41 catalyst favored the reverse water gas shift (RWGS) reaction and realized high CO2 conversion rate to carbon monoxide. A kinetic study was also carried out for methanation and RWGS reaction. Using Ni-MCM-41 catalyst for methanation, the rate equation could be expressed as r = kCCO20.68CH23.31, where C represents concentration. Using Cu-MCM-41 catalyst for RWGS reaction, the rate equation could be expressed as r = kCCO20.5CH21.1, where C represents concentration.
Starting Page	4313
Ending Page	4321
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	12
Journal	Catalysis Science & Technology
DOI	10.1039/c4cy00688g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Methane Oxygen Methanation Chemical bond Water gas Nevus Carbon dioxide Hydrogenation Silicon dioxide Ammonia Silanol Cu Hydrothermal synthesis Zn Mesoporous silica Rate equation Tetramethyl orthosilicate Carbon monoxide
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Transition metal-rich mesoporous silicas and their enhanced catalytic properties

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