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Vapour Phase Synthesis of 2-Methylpyridine and 4-Methylpyridine Over Potassium Salts of 12-Tungstophosphoric Acid


Affiliations
1 CSIR-Central Institute of Mining & Fuel Research, Dhanbad 828 108, Jharkhand, India
2 Department of Applied Chemistry, IIT-ISM, Dhanbad 826 004, Jharkhand, India

Vapor phase dehydrocyclization reaction of acetaldehyde and ammonia was investigated over K salts of 12-tungstophosphoric acid as catalysts in a continuous flow fixed bed reactor at 350–450℃. The yield of 2-methylpyridine and 4-methylpyridine were found to be in the range of 38.0–64.5%. The 2-methylpyridine and 4-methylpyridine are used for the preparation of insecticides, poultry drugs, cattle drugs and anti-tuberculosis drugs, veterinary analgesics etc. respectively. The reaction conditions such as temperature, contact time, and molar ratio for achieving optimal yield with respect to 2-methylpyridine and 4-methylpyridine were discussed. Catalysts were characterized through BET surface area, FT-IR, XRD and TGA. NH3-TPD studies exhibit the moderate acidity. The morphology of the catalysts was also studied by FESEM.
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Abstract Views: 92




  • Vapour Phase Synthesis of 2-Methylpyridine and 4-Methylpyridine Over Potassium Salts of 12-Tungstophosphoric Acid

Abstract Views: 92  | 

Authors

Rabi Narayan Senapati
CSIR-Central Institute of Mining & Fuel Research, Dhanbad 828 108, Jharkhand, India
Devendra D Pathak
Department of Applied Chemistry, IIT-ISM, Dhanbad 826 004, Jharkhand, India
Pashupati Dutta
CSIR-Central Institute of Mining & Fuel Research, Dhanbad 828 108, Jharkhand, India
Hridesh Agarwalla
CSIR-Central Institute of Mining & Fuel Research, Dhanbad 828 108, Jharkhand, India
Gajanan Sahu
CSIR-Central Institute of Mining & Fuel Research, Dhanbad 828 108, Jharkhand, India

Abstract


Vapor phase dehydrocyclization reaction of acetaldehyde and ammonia was investigated over K salts of 12-tungstophosphoric acid as catalysts in a continuous flow fixed bed reactor at 350–450℃. The yield of 2-methylpyridine and 4-methylpyridine were found to be in the range of 38.0–64.5%. The 2-methylpyridine and 4-methylpyridine are used for the preparation of insecticides, poultry drugs, cattle drugs and anti-tuberculosis drugs, veterinary analgesics etc. respectively. The reaction conditions such as temperature, contact time, and molar ratio for achieving optimal yield with respect to 2-methylpyridine and 4-methylpyridine were discussed. Catalysts were characterized through BET surface area, FT-IR, XRD and TGA. NH3-TPD studies exhibit the moderate acidity. The morphology of the catalysts was also studied by FESEM.