Correlations of cracking properties of magnesium-yttrium zeolites with their acidic and basic sites
Correlations of cracking properties of magnesium-yttrium zeolites with their acidic and basic sites
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镁钇沸石的裂解性能与其酸性和碱性位点的相关性
DOI：
10.1021/j100562a010
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
D. Barthomeuf
中科院分区：
文献类型：
--
作者：
C. Mirodatos;A. Kais;J. Védrine;P. Pichat;D. Barthomeuf
本文测定了具有不同H ~+和Mg ~（2+）含量和相同Na ~+含量的Mg-Y沸石的异辛烷裂解催化活性、表面酸性（用显色指示剂和化学吸附吡啶的红外光谱）和不同OH基浓度（用红外光谱和ESR光谱）。讨论了Mg ~（2+）离子对这些性质的影响。根据400 ℃时CO_2的影响，提出在3685 cm ~（-1）红外带中的碱性Mg（OH）~+物种可能抑制了一部分产生3640 cm ~（-1）红外带和4.1 Oe宽ESR谱线的质子对催化裂化的作用。CO_2在提高催化剂性能中所起的作用已被阐明。
The catalyticactivity for isooctane cracking, the surface acidity (using colored indicators and ir spectra of chemisorbed pyridine), and the concentrations in various OHgroups (by means of ir and ESR spectroscopies) have been measured for Mg-Y zeolites having various H+ and Mg2+ contents and the same Na+ con-tent. The influence of Mg2+ cations on these properties are discussed in terms of cation location and polarizing field. On the basis of the influence of CO2 at 400 C, it is suggested that a part of the protons giving rise to the ir band at 3640 cm-1 and the ESR line of 4.1-Oe width may be inhibited for the catalytic cracking by the basic Mg (OH)+ species associated with the 3685-cm-1 ir band. The role played by CO2 in the increase of catalytic properties has beencleared up.