Spatially resolving infrared spectroscopy for parallelized characterization of acid sites of catalysts via pyridine sorption:: Possibilities and limitations
Spatially resolving infrared spectroscopy for parallelized characterization of acid sites of catalysts via pyridine sorption:: Possibilities and limitations
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DOI：
10.1016/j.jcat.2003.11.002
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发表时间：
2004-02-15
影响因子：
7.3
通讯作者：
Schüth, F
中科院分区：
文献类型：
--
作者：
Busch, OM;Brijoux, W;Schüth, F
一种新的高通量分析装置已经开发出来，以并行的方式研究多达八种固体物质的酸度。该方法采用红外焦平面探测器和专门设计的测量单元。以Y型分子筛、H-ZSM-5和H-Mordenite为酸性材料，无定形SiO2为非酸性材料，对整个体系进行了验证。结果表明，用Y型分子筛和H-ZSM-5分子筛，可以得到与常规装置相当质量的吸附吡啶的红外光谱。通过加热测量池中的样品，可以跟踪吸附的吡啶的解吸，以区分表面上不同的吸附吡啶物质。对于无定形二氧化硅，仅发现物理吸附的吡啶，并且在加热样品后没有吡啶留下。与此相反，不可能用这种装置分析H-丝光沸石的酸位点。这可能是由于材料的粒度引起的散射效应，这对该设置中的测量的可行性具有严重影响。也可以在该池中使用其他吸附剂来分析不同的表面性质。(C)2003年爱思唯尔公司All rights reserved.
A new high-throughput analysis setup has been developed to investigate the acidity of up to eight solid materials in a parallel way. This method applies an IR focal plane array detector and an especially designed measurement cell adapted to this system. The whole system was validated by using zeolite Y, H-ZSM-5, and H-Mordenite as acidic materials and amorphous silica as nonacidic material. It was found that with zeolite Y and H-ZSM-5 it is possible to get IR spectra of the adsorbed pyridine with comparable quality as that in a conventional setup. By heating the samples in the measurement cell it is possible to follow the desorption of the adsorbed pyridine to distinguish different adsorbed pyridine species on the surface. For amorphous silica only physisorbed pyridine has been found and after heating of the sample there was no pyridine left. In contrast to this it was not possible to analyze the acid sites of H-Mordenite with this setup. This could be due to scattering effects caused by the particle size of the material which has a severe influence on the feasibility of measurements in this setup. Also other adsorptives could be used in this cell to analyze different surface properties. (C) 2003 Elsevier Inc. All rights reserved.