K-Modulated Co Nanoparticles Trapped in La-Ga-O as Superior Catalysts for Higher Alcohols Synthesis from Syngas

Abstract

Owing to the outstanding catalytic performance for higher alcohol synthesis, Ga-Co catalysts have attracted much attention. In view of their unsatisfactory stability and alcohol selectivity, herein, K-modulated Co nanoparticles trapped in La-Ga-O catalysts were prepared by the reduction of La1−xKxCo0.65Ga0.35O3 perovskite precursor. Benefiting from the atomic dispersion of all the elements in the precursor, during the reduction of La1−xKxCo0.65Ga0.35O3, Co nanoparticles could be confined into the K-modified La-Ga-O composite oxides, and the confinement of La-Ga-O could improve the anti-sintering performance of Co nanoparticles. In addition, the addition of K modulated parts of La-Ga-O into La2O3, which ameliorated the anti-carbon deposition performance. Finally, the addition of K increased the dispersion of cobalt and provided more electron donors to metallic Co, resulting in a high activity and superior selectivity to higher alcohols. Benefiting from the above characteristics, the catalyst possesses excellent activity, good selectivity, and superior stability.

Effect of KCoMoS2 Catalyst Structures on the Catalytic Performance of Higher Alcohols Synthesis via CO Hydrogenation

“…Moreover, the higher alcohols, after separation and purification, can serve as feed stocks for value-added fine chemicals, demonstrating a wide application prospect [4]. Generally, the catalytic production process for higher alcohols synthesis from syngas needs to occur over the solid catalysts, which are roughly classified into the following four categories: modified methanol synthesis catalysts [5,6], modified Fischer-Tropsch synthesis catalysts [7,8], noble metal ruthenium-based catalysts [9,10], and molybdenum sulfide-based catalysts [11,12]. Among these catalyst systems, the modified methanol synthesis catalyst mainly produced methanol with a lower C 2+ OH selectivity.…”

Comprehensive Review on Synthesis of Abox Material and its Catalytic Applications

“…Guo et al [130] show that employing LaCoyGa1-yO3 mixed oxides as catalysts, alcohols (mostly methanol/ethanol) may be synthesized from syngas. The precursor of segregated cobalt nanoparticles in the LaGaO composite oxide is La1-…”

Active Site Synergy of Rh and Co Derived from ZrO2-Supported LaRhxCo1–xO3 Perovskite Nanostructures for the Direct Synthesis of Ethanol from Syngas

“…They claimed that the development of homogeneous and highly dispersed Rh–Fe alloys was decisive toward the high selectivity and activity of YRh 0.5 Fe 0.5 O 3 /ZrO 2 . In another similar work by Liu et al, K-modulated Co nanoparticles trapped in La–Ga–O catalysts were synthesized by reducing the La 1– x K x Co 0.65 Ga 0.35 O 3 perovskite precursor. It was found that adding K improved Co dispersion and provided metallic Co as additional electron donors, leading to high activity and superior selectivity to higher alcohols.…”