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Effect of noble metals deposition on the catalytic activity of MAPO-5 catalysts for the reduction of NO by CO

Paper ID Volume ID Publish Year Pages File Format Full-Text
41876 45903 2010 10 PDF Available
Title
Effect of noble metals deposition on the catalytic activity of MAPO-5 catalysts for the reduction of NO by CO
Abstract

Molecular sieves MAPO-5 (M: Co, Ti, Cr and Fe) with the AFI structure type were prepared by the hydrothermal method. Noble metals (Pd, Rh, Ir and Ru) were deposited on the molecular sieve supports using the homogeneous deposition precipitation method. The catalysts were characterized using XRD, TEM, DRUV-VIS, N2 sorption, SEM, TG/DTA and ICP analysis techniques. The PdO and RhOx species demonstrated small particle sizes as compared with other noble metals. The catalysts were evaluated for their performance in the reduction of NO by CO at different temperatures (150–500 °C) for a GHSV of 44,000 h−1. Among the palladium and noble metals deposited catalysts, the PdCoAPO-5 and RhCoAPO-5 showed excellent performance. For the RhCoAPO-5 (Rh loading = 2.98% and Rh particle size = 2.2 nm) catalyst, the temperature required for complete NO reduction was 210 °C, which is lower than that required for PdCoAPO-5 (Pd loading = 2.96% and Pd particle size = 4 nm) and IrCoAPO-5 (Ir loading = 2.89% and Ir particle size = 6.5 nm) under identical conditions. The Rh deposited CoAPO-5 catalyst effectively operated at lower temperatures as compared with the other noble metal deposited CoAPO-5 catalysts studied here.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (100 K)Download as PowerPoint slideResearch highlights▶ Molecular sieves MAPO-5 (M: Co, Ti, Cr and Fe) were prepared by the hydrothermal method. ▶ Noble metals were deposited by the hdp method. ▶ The various characterization studies show the high crystallinity of MAPO-5 molecular sieves. ▶ The PdCoAPO-5 and RhCoAPO-5 catalysts showed excellent performance for the reduction of NO by CO.

Keywords
MAPO-5; Hydrothermal synthesis; Noble metals; hdp method; Characterization; NO reduction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 389, Issues 1–2, 1 December 2010, Pages 9–18
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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