The traditional way of synthesizing metaldehyde from single hydrochloric acid catalyst was replaced by a compound hydrochloric acid catalyst, which was prepared through hydrochloric acid, hydroxylamine hydrochloride, sodium bromide, pyridine.

The results indicate that the best operation condition are 5% compound acid catalyst(W%) of oil,oil to methanol molar ratio is about 1:6,reaction time is about 6 houres,reaction temperation is about 65 ℃.

Adopts sol-gel method to prepare the P25/SnO2 compound catalyst,taking the photo-catalytic degradation of reactive brilliant red X-3B as a model,to research several factors which in-fluence the reaction.

Fresh MnO2/attapulgite was used as compound catalyst for ozonation of phenol in aqueous solutions,and the different conditions of catalytic ozonation have been investigated.

According to the experimental results, the catalytic activity of compound catalyst at the best composition is more effective compared with potassium carbonate, which is well known as a best catalyst.

By co-supporting of metallocene catalyst—bis(tetramethylcyclopendaienyl)zirconium dichloride(TMCP)and Schiff base catalyst—bisN-cyclohexyl-(3-t-butylsalicylidene imine)zirconium dichloride(FI)on silica gel,TMCP-FI compounded catalyst was prepared.

The non - toxic acetyl tributyy citrate was synthsized by tributyl citrate and acetyloxide in the presence of compounded catalyst.

Preparation of polyethylene with bimodal distribution catalyzed by complex catalyst of Ziegler-Natta with metallocene

Trimethylaluminum(TMA),usually used in organic catalysis and organic synthesis,was synthesized by reaction of triethylaluminium (TEA) with methyl bromide on iron-stibonium complex catalyst.

The result shows that,in the improved experimental(equipment,) under the N_2 protection for 35 h,and by using the proper complex catalyst and solvent volume(ratio,)_w of PLA can be to 6.