View in EDS

Alumina supported, perovskite oxide based catalytic materials and their auto-exhaust application.

Saved in:
Bibliographic Details
Title: Alumina supported, perovskite oxide based catalytic materials and their auto-exhaust application.
Authors: Labhsetwar, Nitin K1 (AUTHOR) nitin_neeri@yahoo.com, Watanabe, A1 (AUTHOR), Biniwale, R.B1 (AUTHOR), Kumar, R1 (AUTHOR), Mitsuhashi, T1 (AUTHOR)
Source: Applied Catalysis B: Environment & Energy. Sep2001, Vol. 33 Issue 2, p165-173. 9p.
Subjects: Catalytic activity, Perovskite, Pollutants, Oxides, Cordierite, Aluminum oxide, Honeycomb structures
Abstract: Substituted lanthanum manganate type perovskites have been synthesized following co-precipitation and a modified in situ method. These perovskites have been supported on cordierite honeycomb with and without alumina washcoat. Alumina washcoated supports with lanthana pre-coat, have been found suitable for the in situ synthesis of perovskites to avoid reactivity of perovskite precursors with alumina (in absence of lanthana pre-coat). This modified synthesis has resulted in remarkable improvement in surface area while, excellent catalyst adhesion has also been observed. The catalyst composition has also been promoted by a small amount of platinum, which has resulted in improved catalytic activity. These catalysts have been first evaluated using a pure gas laboratory evaluation assembly. Catalysts prepared on alumina washcoated honeycomb having lanthana pre-coat, shows better activity than the samples prepared by co-precipitation method. Catalytic converter prototypes have been prepared using the selected catalyst and evaluated on engine and chassis dynamometers. The converter shows good conversion activity for all the three pollutants, viz. CO, HC and NO x. These results substantiate the possibility of using supported perovskites for automobile applications. The detailed characterization of supported perovskites, however, could not be done conclusively and demand for further investigations, to properly understand the interaction of pre-coat, alumina washcoat and catalyst. [ABSTRACT FROM AUTHOR]
Copyright of Applied Catalysis B: Environment & Energy is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Substituted lanthanum manganate type perovskites have been synthesized following co-precipitation and a modified in situ method. These perovskites have been supported on cordierite honeycomb with and without alumina washcoat. Alumina washcoated supports with lanthana pre-coat, have been found suitable for the in situ synthesis of perovskites to avoid reactivity of perovskite precursors with alumina (in absence of lanthana pre-coat). This modified synthesis has resulted in remarkable improvement in surface area while, excellent catalyst adhesion has also been observed. The catalyst composition has also been promoted by a small amount of platinum, which has resulted in improved catalytic activity. These catalysts have been first evaluated using a pure gas laboratory evaluation assembly. Catalysts prepared on alumina washcoated honeycomb having lanthana pre-coat, shows better activity than the samples prepared by co-precipitation method. Catalytic converter prototypes have been prepared using the selected catalyst and evaluated on engine and chassis dynamometers. The converter shows good conversion activity for all the three pollutants, viz. CO, HC and NO x. These results substantiate the possibility of using supported perovskites for automobile applications. The detailed characterization of supported perovskites, however, could not be done conclusively and demand for further investigations, to properly understand the interaction of pre-coat, alumina washcoat and catalyst. [ABSTRACT FROM AUTHOR]
ISSN:09263373
DOI:10.1016/S0926-3373(01)00175-8