甲苯
化学
歧化
分压
选择性
去甲基化
异构化
催化作用
有机化学
核化学
氧气
生物化学
基因
基因表达
DNA甲基化
作者
G. L. Rabinovich,G. N. Maslyanskii,В. С. Воробьев,L. M. Biryukova,I. I. Ioffe
出处
期刊:Petroleum chemistry U.S.S.R
[Elsevier]
日期:1973-01-01
卷期号:13 (3): 155-160
被引量:2
标识
DOI:10.1016/0031-6458(73)90012-9
摘要
The catalytic toluene hydrogenation over Ni/SiO2 was carried out using H2 or a H2/H2O mixture. The toluene conversion and MCH selectivity were evaluated under partial steam pressures 0−10 kPa, at H2/toluene molar ratios 1–5, and at temperatures 393−453 K. In the absence of steam, toluene conversion increased with increasing H2 partial pressure, and the MCH selectivity decreased with increasing temperature. In the presence of steam, the toluene conversion showed near-constant activities over the entire range of steam partial pressures, and the MCH selectivity increased with increasing steam partial pressure. This result indicated that the addition of steam inhibited byproduct formation. To clarify the effects of steam on the side-reaction, the byproducts composition was analyzed using a gas chromatograph. The results showed that the addition of steam inhibited demethylation, the ring-opening reaction of MCH, the disproportionation of toluene, and isomerization to convert six-membered ring compounds into five-membered ring compounds.
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