Analysis of the causes of deactivation of petroleum resin hydrogenation catalysts

In recent years, hydrogenation petroleum resin has become more and more popular, and XunKai Catalyst has been devoted to research for many years. In previous issues, we have introduced the application of resin, hydrogenation process and hydrogenation catalyst, and today we will talk about what we know and don't know about catalyst poisoning in hydrogenation process.

Petroleum resin raw materials are obtained from ethylene by-products, the composition is complex, if not treated or not completely treated, it will affect the life of the hydrogenation catalyst.

1. toxic substances containing sulfur, chlorine, fluorine, heavy metals, etc. adsorbed in the catalyst active site, thus affecting the activity.

2. deactivation caused by blockage of catalyst pores by polymers or carbon accumulation.

3. catalyst deactivation caused by sintered growth of active metal particles.

4. Structural damage such as catalyst pore collapse.

Hydrogenation raw materials are large molecular compounds, which may also polymerize during the reaction and accumulate for a long time to cause pore blockage.

So when the catalyst is deactivated, it can be simply treated with solvent high temperature reflux, and the deactivation caused by the general polymer blockage, this method can make the catalyst restore some activity.

There are many possibilities of catalyst deactivation, many times we can't tell by the surface, so we need to use analytical instruments, XunKai Chemical has long-term cooperation with many universities and analytical platforms. 

We can provide you with all kinds of analytical data such as SEM-EDX (energy spectrum analysis is the elemental analysis of catalyst surface, which can determine whether the catalyst is deactivated by adsorption of sulfur, chlorine and other substances), HTPR ( programmed temperature rise reduction to determine whether the catalyst is oxidized and whether the active particles are changed), BET (nitrogen adsorption method to determine the catalyst specific surface area, pore volume, pore size and other data to determine whether the catalyst structure is collapsed), TG-DTA (programmed temperature rise to detect catalyst weight loss and heat change to determine whether there is polymer or carbon accumulation blocking the catalyst pore channel). By analyzing these instruments, the cause of catalyst poisoning can be basically determined.