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Highly active and stable Ni-based bimodal pore catalyst for dry reforming of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
39334 45818 2015 11 PDF Available
Title
Highly active and stable Ni-based bimodal pore catalyst for dry reforming of methane
Abstract

•A bimodal pore nickel catalyst was prepared by refluxed co-precipitation method.•The prepared catalyst demonstrated a high performance for DRM reaction in a long duration.•The best NiO-loading is 15 wt% NiO in NiCeMgAl catalyst.•The deposited carbon on this catalyst was mainly multi wall nanotube-type.

Bimodal pore NiCeMgAl catalysts were synthesized via the refluxed co-precipitation method. Methane reforming using carbon dioxide over this bimodal pore NiCeMgAl catalyst for syngas production was systematically studied by optimizing the active component NiO-loading, calcination temperature, reduction temperature and gas hourly space velocity (GHSV). The Ni15CeMgAl sample with 15 wt% NiO loading, was found to be active enough at 750 °C with a high CH4 conversion of 96.5%. The proper reduction temperature for the NiCeMgAl catalyst is either 550–650 °C or 850 °C. Higher calcination temperature favors the formation of NiAl2O4 and MgAl2O4 spinel structures. The Ni active sites derived from the NiAl2O4 spinel structure had longer stability than those from the free NiO. Compared with non-bimodal pore NiCeMgAl catalyst, bimodal pore NiCeMgAl catalyst has a longer stability in the feed gas without dilution. The large pores in the bimodal pore Ni15CeMgAl catalyst were supposed to contribute to the quick molecule transfer during the dry reforming of methane (DRM) reaction when the GHSV was less than 96,000 h−1. The evolution of the Ni15CeMgAl catalyst before and after the DRM reaction was investigated by BET, XRD, TEM, and TGA techniques. A schema of the DRM reaction on the bimodal pore Ni15CeMgAl catalyst was proposed, and the correlation between the structure evolution and catalytic performance change was also discussed.

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Keywords
Nickel catalyst; Bimodal pore; Reflux; Dry reforming of methane
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Highly active and stable Ni-based bimodal pore catalyst for dry reforming of methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 491, 5 February 2015, Pages 116–126
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us