Abstract

The regularities of formation of suspensions of dispersed molybdenum-containing catalyst nanosized particles synthesized in situ in heavy petrochemical feedstock with various compositions are studied depending on hydroconversion conditions. Ammonium heptamolybdate is used as a precursor. The following parameters are varied in the experiments: the precursor catalyst concentration, within 0–1% molybdenum; feedstock composition, both group and fractional composition; sulfur concentration in the feedstock, in the range of 0.87–3.39%; and temperature, in the range of 420–450°C. It is found that the fraction of molybdenum sulfide in the composition of the catalyst grows and the concentration of coke in the hydroconversion residue insoluble in toluene decreases with increasing partial pressure of hydrogen sulfide in the reaction gas. Molybdenum compounds in the catalyst slightly affect the conversion of the fraction >500°C but substantially decrease the yield of condensation products. The rate constants and activation energy of the desulfurization reaction of vacuum residue in the presence of the dispersed catalyst are calculated.

中文翻译：

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加氢转化条件对原位形成的超细含钼催化剂组成和性能的影响

摘要

根据加氢转化条件，研究了在具有各种组成的重质石油化工原料中原位合成的分散的含钼催化剂纳米尺寸颗粒的悬浮液的形成规律。七钼酸铵用作前体。实验中改变了以下参数：前驱体催化剂浓度，钼在0-1％以内；原料组成，包括组份和分数组成；原料中的硫浓度范围为0.87–3.39％；和温度范围为420–450°C。发现随着反应气体中硫化氢分压的增加，催化剂中硫化钼的比例增加，不溶于甲苯的加氢转化残余物中的焦炭浓度降低。催化剂中的钼化合物对> 500°C的馏分的转化率有轻微影响，但会大大降低缩合产物的收率。计算了分散催化剂存在下减压渣油脱硫反应的速率常数和活化能。