Work

Molybdenum carbide catalysts

Year: 1988

Type: article

Abstract: Metastable cubic α-MoC1−x(x ~ 0.5) unsupported powders with specific surface area ca. 200 m2 g−1 and particle size ca. 3 nm were prepared by temperature-programmed reaction (TPR) of MoO3 with ammonia producing first Mo2N which was subsequently converted to α-MoC1−x by TPR with a CH4/H2 mixture. Alternatively, a direct TPR of MoO3 with a CH4/H2 mixture also produced α-MoC1−x, provided that a small amount of platinum was impregnated on MoO3 prior to TPR. Reactions involved in both processes were topotactic, with formation of metastable α-MoC1−x crystals exhibiting pseudomorphism with the original platelets of MoO3, the starting material. Without platinum, the reaction between MoO3 and CH4/H2 required a higher temperature of initial reduction and the reaction was not topotactic, leading to hexagonal Mo2C, the thermodynamically stable phase of molybdenum carbide.

Source: Journal of Catalysis

DOI: 10.1016/0021-9517(88)90119-4

Authors: J.S. Lee, L. Volpe, F.H. Ribeiro, M. Boudart

Institution: Stanford University

Language: English

Topic: Catalysts for Methane Reforming

Subfield: Catalysis

Field: Chemical Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,250

Funders: National Science Foundation, U.S. Department of Energy, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Division of Materials Research