Optimization of Hydrogen-Enriched Biogas by Dry Oxidative Reforming with Nickel Nanopowder Using Response Surface Methodology

Abstract

Today, the worldwide research is focused on the development of alternative energy sources for power generation; thus, the present study aims to optimize the dry oxidative reforming (DOR) process parameters for H 2 -enriched biogas production by integrating response surface methodology with a three-level, three-factor Box−Behnken design in the presence of commercial Ni nanopowder. First, the effect of CH 4 /CO 2 and O 2 /CH 4 ratios on the catalytic performance of DOR was assessed in the temperature range of 800−900 °C. The reactant (CH 4 and CO 2 ) conversions, product (H 2 and CO) yields, selectivities of H 2 and CO, H 2 /CO ratio, and specific energy consumption were chosen as responses. The empirical regression models were developed to identify the influential and most significant parameters. More than a 95% value of determination coefficients by analysis of variance proved that the developed regression models were highly satisfactory. Experimentally, a maximum H 2 enrichment of 38.7% with 82.9 and 90.8% CH 4 and CO 2 conversions, respectively, were achieved at optimal reaction conditions of 900 °C, 1.5 CH 4 /CO 2 ratio, and 0.10 O 2 /CH 4 ratio. The combination of the regression model and dry oxidative technique for biogas reforming could provide an attractive proposition for enhancing the yield of H 2 in product gases with a subsequent increase in energy density and production of environmentally friendly gas.

Comparative analysis of ethanol‐steam and ‐autothermal reforming for hydrogen production using Aspen Plus

“…These findings suggest that when surplus steam is delivered to the autothermal reformer, the net heat requirement from the reactions increases. [ 43,44 ] The oxidation becomes more prominent as the O/E ratio rises, and the temperature of the autothermal reformer rises as well, until it reaches its ideal condition, where the hydrogen content reaches its maximum value. Table 5 lists a few near‐optimal parametric conditions for negligible heat requirement in ATR to produce H 2 from 702 simulation runs.…”

Optimization of Ni-Based Catalysts for Dry Reforming of Methane via Alloy Design: A Review

“…By doping or forming an alloy, the adsorption of O* at the Co step is regulated, and the oxidation of the Co catalyst can be inhibited . It has been reported that low Ni loading is sufficient to improve the performance of the catalyst when the catalyst is reduced at higher temperatures . Ni–Co/TiO 2 catalysts with a small amount of Ni substitution for Co can inhibit the oxidation of metallic Co, while too much Ni substitution can cause severe carbon deposition, implying that Ni–Co bimetallic catalysts with high DRM activity require a suitable Co/Ni ratio .…”

“…184 It has been reported that low Ni loading is sufficient to improve the performance of the catalyst when the catalyst is reduced at higher temperatures. 194 Ni−Co/TiO 2 catalysts with a small amount of Ni substitution for Co can inhibit the oxidation of metallic Co, while too much Ni substitution can cause severe carbon deposition, implying that Ni−Co bimetallic catalysts with high DRM activity require a suitable Co/Ni ratio. 195 Takanabe et al 184 found that the Ni/ Co ratio could modulate the surface metal properties to obtain highly active and durable DRM catalysts.…”

Thermodynamic equilibrium analysis of oxy‐dry reforming of biogas with CO2 sequestration using Aspen HYSYS

“…Meanwhile, in order to reduce energy requirement and catalyst carbon deposition in the DR process, another approach, that is, dry oxidative reforming (DOR), has been investigated for syngas production 21,28 . Extensive research articles were published on experimental studies, with some on catalyst preparation using different oxides and promoters, their reaction mechanisms, and performances in DOR 29–31 . DOR uses both CH 4 and CO 2 as reactants and O 2 as an additional oxidant to minimize carbon deposition on the catalyst and make an overall energy‐efficient process.…”