ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Copper molybdenum mixed metal oxides catalysts for efficient soot oxidation in diesel emission control

Sunit Kumar Singh, Hari Prasad Uppara, Prajakta Mohan Ramteke, Harshini Dasari, and Nitin K. Labhasetwar

Energy and Resource Management Division, CSIR– National Environmental Engineering Research Institute, Nagpur, India

E-mail: sunitkumarsingh279@gmail.com

Received: 25 May 2023  Accepted: 8 November 2023

Abstract:

In the present work, copper molybdenum mixed oxide phase Cu₃Mo₂O₉ was synthesized and studied for catalytic diesel soot oxidation reaction. The impregnation of silver and potassium over copper molybdenum mixed oxide was also studied for further improvement in soot oxidation activity under the both tight and loose contact modes. The soot oxidation temperature (T_max) decreased from 602 °C in the absence of catalyst to 376 °C with copper molybdenum mixed oxide under tight contact mode, while this was observed at 434 °C for loose contact condition, which suggest high activity of the present catalyst for soot oxidation reaction. There was only slight improvement in the catalytic activity of silver and potassium promoted catalysts. From the detailed structural characterization of the as-prepared catalyst, it was inferred that the synthesized copper molybdenum mixed oxide phase was Cu₃Mo₂O₉. The catalyst structure is highly defective with structural oxygen vacancies responsible for rapid soot oxidation at lowered temperature. These findings were also corroborated by XPS and other studies.

Keywords: Soot oxidation; Diesel emission control; Mixed metal oxide

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-03206-3

Chemical Papers 78 (3) 1805–1823 (2024)