Effective hydrogen productions from propane steam reforming over spinel-structured metal-manganese oxide redox couple catalysts

Abstract

Summary In this study, redox couple metal components (M═Mn) were introduced in a catalyst design. Main catalytic components (M═Fe, Co, Ni, or Cu) were combined with Mn, resulting in spinel‐structured M2MnO4 for applications to the propane steam reforming reaction as catalysts. Hydrogen selectivity and propane conversions over spinel‐structured 30.0 wt% M2MnO4 loaded on 70.0 wt% γ‐Al2O3 support were comparable. The Ni2MnO4/Al2O3 exhibited extremely stable catalytic performance for 3 recycling tests. Catalytic activities decreased in the order Ni2MnO4/Al2O3 > Co2MnO4/Al2O3 > Fe2MnO4/Al2O3 > Cu2MnO4/Al2O3 > Mn2O3/Al2O3. A mechanism for propane steam reforming over M2MnO4 was suggested, and it was found that the catalytic performance for the reforming reaction was closely related to the stability of metal oxidation states via Mn oxide assistance. Furthermore, this study suggested that the Mn oxide delivered oxygen to the main catalytic active site, in particular the Ni component, leading to the rapid cracking and oxidation of C3H8, C2H4, and CH4, and increased hydrogen production.

The effects of cobalt and cerium promoters on hydrogen production performance of alumina‐supported nickel catalysts in propane steam reforming

“…34,35 In addition, the observed peak for material with 5.5 wt% Co in the range of 550-650°C can be credited to the reduction of the NiO-CoO mixed oxide phase, which has moderate interaction with the support, or may be as a result of the reduction of CoO to Co 0 . 21,36,37 The peaks at 710 and 810°C may be attributed to the reduction of NiAl 2 O4 mixed oxide. The small shoulder at about 820-860°C is most likely caused by reduction of a portion of Co species that is incorporated into the alumina framework as cobalt aluminate.…”

“…Similar results have been reported by Kim et al 20 They examined the influence of Ce on Ni/Al 2 O 3 and Ni/MgAl catalysts and attributed the observed higher C 3 H 8 conversion and H 2 yield to the smaller Ni particle size and better reducibility of the Ni active phase. Do et al 21 investigated the effect of Mn promoter on the catalytic performance of Ni/Al 2 O 3 catalyst and suggested that Mn could increase H 2 production. Furthermore, The role of Fe oxide as a lifetime promoter of alumina-supported Ni catalyst was explored by Kim et al 22 It was indicated that Fe oxide improved catalyst stability and H 2 selectivity through diminished coke (precursor) deposition.…”

“…They examined the influence of Ce on Ni/Al 2 O 3 and Ni/MgAl catalysts and attributed the observed higher C 3 H 8 conversion and H 2 yield to the smaller Ni particle size and better reducibility of the Ni active phase. Do et al 21 . investigated the effect of Mn promoter on the catalytic performance of Ni/Al 2 O 3 catalyst and suggested that Mn could increase H 2 production.…”

Ethanol Steam Reforming on CexMyO2 (M: Cu, Zn, and Mn) Solid Solution Catalysts

“…Oxygen vacancies are introduced as active sites for steam decomposition [32]. Researchers believe that oxygen storage capacity and oxygen mobility of metal oxides influence the catalyst performance in the reforming reaction [33].…”

Optimizing the preparation of Ni‐Ce‐Pr catalysts for efficient hydrogen production by n ‐dodecane steam reforming

“…Nowadays, hydrogen as energy carrier is the most attractive because of its high calorific value and zero pollution. 1 Hydrocarbon and its derivatives, such as methane/natural gas [2][3][4][5][6] and alcohol/organic acid [7][8][9][10][11][12][13] steam reforming has been employed for hydrogen production for the high conversion efficiency of this process. Long-chain hydrocarbon fuels, [14][15][16][17] such as ndodecane, have widely used as hydrogen source since their high density, high hydrogen yield and good transportability.…”