The above three points are the conventional factors affecting the reaction speed, the so-called catalytic hydrogenation reaction is too slow generally refers to the problem of slow reaction even after adjusting the above factors to the near limit, which is the focus of this problem. At these times, it is already difficult to solve the problem by theoretical inference alone, and the main influencing factors are summarized through experiments, including

The most common problem in hydrogenation catalysis is that the reaction is slow, or even stops, and the catalyst must be filtered out and the filtrate replenished with new catalyst to continue the reaction.

The heavy metal content on the catalytic cracking balancing agent in China are more than 10 mg/g, so foreign sulfur reduction additives are not necessarily applicable to domestic catalytic cracking units. The Institute of Petrochemical Sciences has studied the transformation mechanism of sulfide in the catalytic cracking process, as well as the transformation process of sulfide adsorption by new materials, and developed desulfurization additives that can process raw materials containing high nickel and high vanadium.

At this stage, researchers mainly improve the performance of catalytic cracking tower bottom oil cracking additives by improving their acid properties and pore structure. In response to the characteristics of seasonal demand for diesel and high gasoline inventory.