Vapour phase synthesis

Vapour phase synthesis may be carried out by passing a mixture of acetylene and acetic acid through a reaction tube at 210-215°C. Typical catalysts for this reaction are cadmium acetate, zinc acetate and zinc silicate. The monomer in each of the above mentioned processes is purified by distillation. 

Systematic studies carried out at C.F.R.I. pertainining to catalytic vapour phase synthesis of pyridine bases, namely 2 4-picolines through cyclodehydrogenation reaction of acetaldehyde and anunonia have been described. Metal oxide modified amorphous silica-aliunina and crystalline alumino-silicate namely ZSM-5 zeolites were found to be active and selective catalysts towards the formation of the lower pyridines bases. The method of preparation, pretreatment vis-a-vis the acidity have been found to affect the catalytic activity and selectivity. It is interesting to observe that metal modified crystalline alumino-silicate ZSM-5 is more selective than amorphous silica-alumina for the formation of 2 4-picoline. A plausible reaction mechanism based on the findings of this study has been proposed. 

An Investigation into the Use of Seeding in the Vapour Phase Synthesis of Self-supporting Zeolite ZSM-5 Discs... 

An investigation into the use of seeding in the vapour phase synthesis... 

The vapour phase synthesis of polypyrrole in order to form a gradient of conductivity in a porous substrate (foam, honeycomb) [168]. 

A variation on true liquid crystal templating is the vapour phase synthesis route reported by Tanaka et where the silica pre-... 

NbAlCl a moleculeur dinuclear complex in the solid, melt, and vapour phases. Synthesis, crystal structure, and Raman spectra. B.Krebs, H.Janssen,... 

M. Campanati, P. Savini, A. Tagjiani, A. Vaccari, Enviroiunentally vapour phase synthesis of alkylquinolines, Catal. Lett. 47 (1997) 247-250. 

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