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In the pretreatment of feeds for catalytic cracking and for HDA, the primary objective is to reduce the amount of organic sulfur and nitrogen compounds in the feedstock [Catal. Rev.-Sci. Eng. 36 (1994) 75] [1]. Organic nitrogen compounds have a significantly negative kinetic effect on hydrotreating reactions. The distribution of the organic nitrogen compounds in feed and hydrotreated products is discussed...
The quantitative MAS 13 C n.m.r. spectra of several catalyst carbon deposits (coke) were simulated using the LINESIM program. The aliphatic part of the coke spectra was simulated using Gaussian-Lorentzian (11) lines with linewidths of 80 to 150 Hz. The chemical shifts and linewidths were chosen from the analysis of coked samples that had been exposed to feed for a very short time (young...
An assessment has been made of several techniques for the quantitative analysis of carbonaceous compounds by MAS 13 C n.m.r. The best results were obtained using the proton gated decoupling pulse sequence coupled with depth pulses. Calibration was performed with external model compounds. From comparative studies using model compounds and samples of real catalyst carbon deposits (coke),...
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