C-13 NMR ANALYSIS OF CATALYST CARBON DEPOSITS SIMULATED BY MODEL COMPOUNDS

被引：12

作者：

FONSECA, A ^{[1
]}

ZEUTHEN, P ^{[1
]}

NAGY, JB ^{[1
]}

机构：

[1] HALDOR TOPSOE,DK-2800 LYNGBY,DENMARK

来源：

FUEL | 1995年 / 74卷 / 09期

关键词：

CATALYSTS; COKE MODEL COMPOUNDS; C-13; NMR;

D O I：

10.1016/0016-2361(95)00074-F

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Mixtures of pyrene and cholestane adsorbed on Haldor Topsoe TK551 catalyst were studied as model compounds for carbonaceous deposits (coke) formed during use of the same catalyst. Several techniques were screened for quantitative analysis of the carbonaceous compounds by C-13 n.m.r. and the best results were obtained using the proton gated decoupling pulse sequence coupled with depth pulses. These quantitative analyses are performed using an external model compound calibration line. Quantitative C-13 n.m.r. analysis of different types of coke revealed that not all the carbons in the coke were observable. The 'invisible' carbons are attributed to graphitic material, since pure graphite is also completely invisible to C-13 n.m.r. under these conditions.

引用

页码：1267 / 1276

页数：10

共 25 条

[1] CROSS POLARIZATION AND MAGIC ANGLE SAMPLE SPINNING NMR-SPECTRA OF MODEL ORGANIC-COMPOUNDS .1. HIGHLY PROTONATED MOLECULES [J].