Related Experiment Video
Updated: Jan 10, 2026

Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
Published on: February 20, 2020
Spectroscopic identification of acid-base pairs in solid catalysts
Yao Xiao1, Xianfeng Yi1, Youdong Xing2
1State Key Laboratory of Magnetic Resonance Spectroscopy and Imaging, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, P. R. China. yxf@wipm.ac.cn.
Abstract:
A systematic characterization of acid-base pairs in solid catalysts was conducted using advanced two-dimensional homonuclear or heteronuclear correlation solid-state nuclear magnetic resonance spectroscopy. Pyridine-d5 or trimethylphosphine was employed as the probe for acid sites, while pyrrole was used to identify base sites. These probe molecules were co-adsorbed onto the catalyst surface. Their spatial proximity was carefully established, thereby revealing the spatial correlations in acid-base pairs and further guiding the rational design and optimization of high-performance bifunctional acid-base catalysts.
More Related Videos
10:19Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
Published on: July 18, 2017
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
Related Concept Videos
Titration of Polyprotic Base with a Strong Acid
Titration of a Weak Acid with a Weak Base
As a result, there is no simple...
Relative Strengths of Conjugate Acid-Base Pairs
Titration of Polyprotic Acids with a Strong Base
IR and UV–Vis Spectroscopy of Carboxylic Acids
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency,...
Titration in Nonaqueous Solvents