Investigating the impact of micropore volume of aminosilica functionalized SBA-15 on catalytic activity for amine-catalyzed reactions
Investigating the impact of micropore volume of aminosilica functionalized SBA-15 on catalytic activity for amine-catalyzed reactions
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研究氨基二氧化硅功能化SBA-15的微孔体积对胺催化反应的催化活性的影响
DOI:
10.1016/j.jcat.2022.09.016
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发表时间:
2022
影响因子:
7.3
通讯作者:
Brunelli, Nicholas A.
中科院分区:
文献类型:
--
作者:
Deshpande, Nitish;Chen, Jee-Yee;Kobayashi, Takeshi;Cho, Eun Hyun;Pineault, Hannah;Lin, Li-Chiang;Brunelli, Nicholas A.
Mesoporous materials such as SBA-15 are used in many applications since the materials are robust and have tunable properties. Whereas these materials are thought to be ideal, the materials are complex with the common synthesis methods producing materials that contain micropores. This work will investigate the impact of micropores on catalytic activity of aminosilica materials. For comparison, materials are formed using a standard method that produces materials with micropores (REG-SBA-15) and using a modified method that produces materials with negligible micropore volume (NMP-SBA-15). After grafting the calcined support with an aminosilane (either (N-methyl amino propyl) trimethoxy silane (denoted as 2°Am) or (N,N-diethyl-3-amino propyl) trimethoxy silane (3°Am)), catalytic testing experiments reveal that NMP-SBA-15 functionalized materials are more active than REG-SBA-15 functionalized materials for a range of reactions. The reactions include (a) glucose isomerization where amines interacting with surface silanols limit catalytic activity and (b) aldol and Knoevenagel chemistry where amine-silanol interactions increase the reaction rate. For aldol chemistry, the observed difference in rate is further investigated using site quantification experiments. Interestingly, the results reveal that three types of sites exist for each material, including sites that are (1) highly active, (2) intermediate active, and (3) inactive. NMR experiments indicate that amines immobilized on REG-SBA-15 supports are less mobile than amines on NMP-SBA-15. For REG-SBA-15, the materials are found to have aminosilanes that have limited mobility and the largest fraction of inactive sites, which suggests that the inactive catalytic sites are in the micropores. Overall, the design of highly active catalytic materials can be achieved using materials that have limited micropore volumes.
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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
R. Lin;G. Carlström;Q. D. Pham;Michael W Anderson;D. Topgaard;K. Edler;V. Alfredsson
通讯作者:
V. Alfredsson
影响因子:
7.3
作者:
Chen, Jee-Yee;Pineault, Hannah;Brunelli, Nicholas A.
通讯作者:
Brunelli, Nicholas A.
DOI:
--
发表时间:
2021
期刊:
Chem Catalysis
影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
N. Deshpande;L. Pattanaik;Mariah R. Whitaker;Chi;Li‐Chiang Lin;N. Brunelli
通讯作者:
N. Brunelli
影响因子:
5.2
作者:
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通讯作者:
Wilson, Karen