Acid Sites on SiO_2-Al_2O_3 Monolayer Catalysts: ~31P NMR Probes of Strength and Accessibility

Bing Hu; Ian D.Gay

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Acid Sites on SiO_2-Al_2O_3 Monolayer Catalysts: ~31P NMR Probes of Strength and Accessibility

机译：SiO_2-Al_2O_3单层催化剂上的酸位：〜31P NMR强度和可及性探针

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We have examined the acidic properties of a SiO_2-on-Al_2O_3 monolayer catalyst by ~31P NMR of adsorbed tricyclohexylphosphine and triphenylphosphine. These large probe molecules permit the assessment of steric effects, by comparison with trimethylphosphine, and reveal differences in acid strengths of surface sites. We find that there are signficant constraints to accessing Lewis sites, but not Bronsted sites. The concentration of strong Bronsted sites is slightly less than half of the total concentration of Bronsted sites.

机译：我们通过吸附的三环己基膦和三苯基膦的〜31P NMR检查了SiO_2-on-Al_2O_3单层催化剂的酸性。通过与三甲基膦进行比较，这些大的探针分子可以评估空间效应，并揭示表面位点的酸强度差异。我们发现访问Lewis站点（而不是Bronsted站点）存在明显的限制。强布朗斯台德点的浓度略小于布朗斯台德点总浓度的一半。

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《The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical》 |2001年第1期|共3页
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Bing Hu; Ian D.Gay;
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1. Acid Sites on SiO_2-Al_2O_3 Monolayer Catalysts: ~31P NMR Probes of Strength and Accessibility [J] . Bing Hu, Ian D.Gay The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2001,第1期

机译：SiO_2-Al_2O_3单层催化剂上的酸位：〜31P NMR强度和可及性探针
2. Nature,strength and accessibility of acid sites in micro/mesoporous catalysts obtained by recrystallization of zeolite BEA [J] . V.V.Ordomsky, V.Y.Murzin, Yu.V.Monakhova Microporous and mesoporous materials: The offical journal of the International Zeolite Association . 2007,第1a2期

机译：分子筛BEA重结晶制得的微/中孔催化剂中酸位的性质，强度和可及性
3. 1H MAS and 1H/27Al TRAPDOR NMR studies of oxygen-zeolite interactions at low temperatures: Probing bronsted acid site accessibility [J] . Liu Haiming, Grey Clare P., Kao Hsien-Ming The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 1999,第23期

机译：低温下氧-沸石相互作用的1H MAS和1H / 27Al TRAPDOR NMR研究：探测布朗斯台德酸位点的可及性
4. Characterization of acidity in TS-1 using 31p MAS NMR of the probe molecule trimethylphosphine [C] . Jianqin ZHUANG Beijing conference and exhibition on instrumental analysis;BCEIA . 2001

机译：使用探针分子三甲基膦的31p MAS NMR表征TS-1中的酸度
5. Catalytic Consequences of Acid Strength and Site Proximity for Acid Chemistry on Solid Bronsted Acid Catalysts. [D] . Knaeble, William John. 2015

机译：固体布朗斯台德酸催化剂上酸化学反应的酸强度和位点邻近性的催化后果。
6. Probing the active site of MIO-dependent 23-aminomutases key catalysts in the biosynthesis of beta-amino acids incorporated in secondary metabolites [O] . Steven D. Bruner, Heather Cooke -1

机译：探测mIO依赖性23-氨基变位酶主要催化剂的活性部位在β-氨基酸中的次级代谢产物结合的生物合成
7. Probing the Activator and Hydrophobic Substrate Binding Sites of PTEN by 31P NMR [O] . Wei Yang, Roberts Mary F. 2012

机译：通过31 P NMR探索PTEN的活化剂和疏水底物的结合位点

Acid Sites on SiO_2-Al_2O_3 Monolayer Catalysts: ~31P NMR Probes of Strength and Accessibility

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