Performance of an Auto-Reduced Nickel Catalyst for Auto-Thermal Reforming of Dodecane

Abstract

To investigate the catalytic performance of diesel reforming catalysts for production of hydrogen gas, Ni-Al catalyst was prepared by the polymer-modified incipient method (NA10-PM). NA10-PM showed excellent catalytic performance and economic feasibility in the auto-thermal reforming reaction, compared to other commercially available catalysts. In particular, auto-reduced NA10-PM showed higher dodecane conversion and similar selectivity at 750 °C compared to H2-reduced NA10-PM. X-ray diffraction (XRD) studies showed that the fresh state of NA10-PM initially automatically reduced by product gases through thermal decomposition of dodecane, and then NiAl2O4 was completely reduced to metallic nickel by the CO and H2 gases produced during the reaction. Additionally, catalytic performance of auto-reduced NA10-PM were investigated at varying steam/carbon molar ratio (S/C) and oxygen/carbon molar ratio (O2/C) in order to determine the optimum conditions of the auto-thermal reforming reaction. The conversion of dodecane over auto-reduced NA10-PM catalyst was remarkable (93%) and increased during the reaction, under conditions of S/C = 1.23, O2/C = 0.25, and gas hourly space velocity of 12,000 h−1 at 750 °C. The results of this study demonstrated that the auto-reduced NA10-PM catalyst was applied successfully for auto-thermal reforming of dodecane.

Enhanced Ni-Al-Based Catalysts and Influence of Aromatic Hydrocarbon for Autothermal Reforming of Diesel Surrogate Fuel

“…In other words, selectivity of H 2 and CO 2 produced by N10A and F10N10A decreased with increasing time, while that of CO and CH 4 increased until these catalysts were completely deactivated. Therefore, compared with the presence of C 11 H 10 , reaction conditions, such as S/C, O 2 /C, and temperature, played a greater role in selectivity of product gas (%), which is consistent with the findings of our previous study [45].…”

“…played a greater role in selectivity of product gas (%), which is consistent with the findings of our previous study [45]. The hydrocarbons produced after reforming were separately analyzed via GC-MS (see Table 1 for the blank test, R5A-I, N10A, and F10N10A data corresponding to 30-minute and 60-minute reactions at the DHM fuel).…”

“…The incorporation of Ni 2+ ions into -Al2O3 (NiAl2O4) resulted in the lattice expansion of -Al2O3 and, hence, the diffraction peak of NiAl2O4 is shifted to a lower diffraction angle, i.e., 66.84°, compared with that of -Al2O3. The NiAl2O4 phase is inactive in the reforming reaction of hydrocarbons [45][46][47]. As shown in Figure 4b and Figure 4c, the Ni and FeNi phase were observed after the H2 pre-reduction treatment and 5-hour reaction at DH fuel.…”

“…Moreover, SEM-EDX analysis revealed that hydrocarbon production promotes carbon deposition on the catalytic surface. The crystal structure of R5A-I, N10A, and F10N10A were characterized via X-ray diffraction (XRD) analysis (see Figure 4) [45][46][47]. As shown in Figure 4b,c, the Ni and FeNi phase were observed after the H 2 pre-reduction treatment and 5-hour reaction at DH fuel.…”

Highly Efficient Al-Doped Ni–Mn–O Catalysts for Auto-Thermal Reforming of Acetic Acid: Role of MnAl2O4 for Stability of Ni Species

“…There are several ways to produce hydrogen from HAc: steam reforming , (SR, eq ), catalytic partial oxidation (CPOX, eq ), and auto-thermal reforming (ATR, eq ). , Among these ways, the ATR process combines the merits of SR and CPOX, balances reaction heat without significant compromise of hydrogen yield, and has attracted extensive attention for hydrogen production. − …”