Deactivation Mechanism of Low-Mercury Catalyst for Acetylene Hydrochlorination
1. Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China;
2. Yunnan Qiehe Investment Co Ltd, Kunming 650000, China
Abstract The fresh and deactivated low-mercury catalysts were characterized by low-temperature nitrogen adsorption-desorption technique, scanning electron microscopy(SEM), temperature programmed desorption- mass spectrometry(TPD-MS), temperature programmed oxidation-mass spectrometry(TPO-MS) and thermal gravimetric analysis(TG). The results showed that HgCl2 of deactivated catalyst lost by 1.6%, deposited carbon reached 13.5% and sulfocompounds were detected. The coking and sulfur poisoning were the main reasons for the new low-mercury catalyst.
