DOI: 10.1016/j.jcou.2013.04.001
Scopus记录号: 2-s2.0-84883148825
论文题名: Effect of reaction temperature on activity of Pt- and Ru-substituted lanthanum zirconate pyrochlores (La2Zr2O7) for dry (CO2) reforming of methane (DRM)
作者: Pakhare D. ; Shaw C. ; Haynes D. ; Shekhawat D. ; Spivey J.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2013
卷: 1 起始页码: 37
结束页码: 42
语种: 英语
英文关键词: Dry reforming
; Isomorphic substitution
; Lanthanum zirconate
; Methane decomposition
; Pyrochlores
; Reverse water gas shift
Scopus关键词: Dry reforming
; Isomorphic substitution
; Lanthanum zirconate
; Methane decomposition
; Pyrochlores
; Reverse water gas shift
; Activation energy
; Carbon
; Lanthanum
; Methane
; Platinum
; Water gas shift
; Zirconium
; Carbon dioxide
英文摘要: Dry (CO2) reforming of methane (DRM) is a highly endothermic reaction (ΔH = +59.1 kcal/mol) producing syngas (H2 and CO) with the H2/CO ratio of ∼1. DRM requires reaction temperatures above ∼800°C for complete equilibrium conversion to CO and H 2, and is inevitably accompanied by carbon deposition. Here we examine lanthanum zirconate (La2Zr2O7) pyrochlores, with the larger trivalent cation La and a smaller tetravalent cation Zr occupying A and B sites, respectively. Three catalysts are tested: La2Zr2O7 [LZ] and two pyrochlores in which Zr in the B-site has been isomorphically partially substituted with (a) Ru (2.00 wt%) [LRuZ] and (b) Pt (3.78 wt%) [LPtZ]. The levels of substitution by weight correspond to identical atomic levels of substitution at the B-site. Here, activation energies are determined as a function of Ru or Pt substitution on the B-site. The results show that activation energies based on both CH4 and CO2 reaction rates are much lower for LRuZ than LPtZ. Conversion of CH4 (XCH4) and CO2 (XCO2) was greater for LRuZ compared to LPtZ at 525°C, 575°C, and 625°C throughout an onstream time of 600 min. After each 600-min run, temperature programmed oxidation (TPO) showed that total carbon formation decreased with increasing reaction temperature, although the stability of the deposited carbon increased with increasing reaction temperature. © 2013 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53060
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Pakhare D.,Shaw C.,Haynes D.,et al. Effect of reaction temperature on activity of Pt- and Ru-substituted lanthanum zirconate pyrochlores (La2Zr2O7) for dry (CO2) reforming of methane (DRM)[J]. Journal of CO2 Utilization,2013-01-01,1