inGAP Centre of Research Based Innovation, University of Oslo, Department of Chemistry, N-0315 Oslo, Norway.
Phys Chem Chem Phys. 2013 Aug 28;15(32):13363-70. doi: 10.1039/c3cp51280k.
Herein we report FTIR in situ adsorption of molecular hydrogen, carbon monoxide, water, methanol, pyridine and 2,4,6-trimethylpyridine (collidine) on nanosheet H-ZSM-5 which was recently studied in the methanol to hydrocarbons (MTH) reaction. The nature of the hydroxyl groups and surface species are described in detail. The IR spectrum of nanosheet H-ZSM-5 is dominated by silanols, which saturate the external surfaces. The acidity of Si(OH)Al is comparable to that observed in the case of standard microcrystalline H-ZSM-5. The study of the external surface allows the recognition of Si(OH)Al species located at the channel entrance, which are mostly all accessible to hindered molecules such as collidine.
本文报道了在甲醇制烃（MTH）反应中最近研究过的纳米片 H-ZSM-5 上，分子氢、一氧化碳、水、甲醇、吡啶和 2,4,6-三甲基吡啶（咔唑）的原位红外光谱吸附。详细描述了羟基和表面物种的性质。纳米片 H-ZSM-5 的红外光谱主要由硅醇组成，硅醇饱和了外表面。Si(OH)Al 的酸度与标准微晶 H-ZSM-5 中观察到的酸度相当。对外表面的研究可以识别位于通道入口处的 Si(OH)Al 物种，这些物种大多数都可以被类似于咔唑的受阻分子所接近。
