Valuation of catalytic activity of nickel– zirconia‐based catalysts using lanthanum co‐support for dry reforming of methane

Abstract

Summary The improvement of hydrogen concentration in the obtained syngas during methane dry reforming is strongly demanded. Additionally, enhancement of CO2 and CH4 conversions has been of high preference. In line with these aims, this research work studies the impact of incorporating lanthanum metal either as a catalytic promoter or as a cosupport, on the efficiency of the reforming process. Two percentages namely 2.5 and 5 wt% were added to a catalyst composed of Ni(10%)–Zr(90%). Thus, four catalytic composites for methane dry reforming were produced. The prepared composites were characterized using XRD, N2‐physisorption, HR‐TEM, TPR, and Raman spectrometer. The catalytic performance and H2/CO ratio were deteriorated as a result of using lanthanum as a promoter, when compared to the nonpromoted zirconia‐supported Ni catalyst. However, using La as a cosupport showed a strong positive effect on reactants' conversions, the resultant H2/CO ratio and H2 yield%. The most active catalyst in this work was Ni/5La‐ZrO2 catalyst; it showed 73% of hydrogen yield and syngas with H2/CO molar ratio of 1.61 which can be used as feed gas in the Fischer–Tropsch process for the production petroleum distillates.

Optimization of Dry Reforming of Methane over a Ni/MgO Catalyst Using Response Surface Methodology

“…04‐006‐8247 are characteristic for MgO, Periclase. The absence of characteristic peaks of NiO indicated the high dispersion of Ni nanoparticles onto the support surface and confirmed that the produced NiO crystals are less than 3 nm 1.…”

“…The test apparatus and the catalytic reforming procedure are the same as those reported in El-Salamony et al [1]. The reaction mixture of CO 2 /CH 4 /Ar in proportions of 1:1:4, 1:1.5:4, and 1:2:4 regulated by mass flow controllers was adjusted to give flow rates corresponding to GHSV values, i.e., 2000, 4000, 6000 ccg -1 h -1 , respectively.…”

“…Dry reforming of methane (DRM) has recently received great attention from both industrial and environmental aspects [1]. The DRM has the advantage of utilizing the two principal components of greenhouse gases, namely, CH 4 and CO 2 , as feedstocks.…”

“…Support and catalyst preparation techniques have a substantial effect on catalytic activity and stability in DMR [9][10][11][12]. On the other hand, many studies focused on the effect of supports such as Al 2 O 3 , MgO, ZrO 2 , and SiO 2 [1,[12][13][14][15][16][17][18]. Basic supports like MgO and La 2 O 3 increase dissociative adsorption of CO 2 during DRM, improve CO 2 conversion, and also reduce coke deposition on the catalyst surface [9,19,20].…”

A coupling bimetallic Ni–La/MCM-41 catalyst enhanced by radio frequency (RF) plasma for dry reforming

“…Moreover, the NiO crystalline size was calculated using Scherrer's formula; the crystal sizes were arranged in the following order: Ni-Imp (21.36 nm) 4 Ni-La-Imp (20.93 nm), which indicated that La-doping did not cause a significant change in the crystal size of NiO particles, which was consistent with the literature reports. 26,27 The particle size of the Ni-La-Sol catalyst was smaller, as the characteristic peaks of the Ni-La-Sol catalyst was much broader and of lower intensity, compared with those of the Ni-La-Imp catalyst. The characteristic peaks of the Ni-La-Imp-P and Ni-La-Sol-P catalysts were much broader and of lower intensity, compared with those of Ni-La-Imp and Ni-La-Sol, which revealed that the particle size was smaller.…”