Why is heating required before catalyst sulfidation, and what are the consequences of rapid temperature rise?

2015-06-21View Original

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1. Why is heating required before catalyst sulfidation, and what are the consequences of rapid temperature rise?

Reply #22015-06-21

The purpose of heating the catalyst is to gradually remove the adsorbed water and crystalline water within it. Another goal is to reach the temperature required for reduction or sulfidation. The heating rate should not be too fast, in order to prevent rapid expansion of the water from causing the catalyst to crack.

Reply #32015-06-24

Programmed temperature rise is carried out before sulfidation; generally, the temperature is maintained at 120°C to remove physically adsorbed water. When the temperature rises too quickly, the moisture doesn’t have time to be removed and circulates within the system. It is unfavorable for subsequent vulcanization.

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