Ni-Mo Sulfide Semiconductor Catalyst with High Catalytic Activity for One-Step Conversion of CO2 and H2S to Syngas in Non-Thermal Plasma

Abstract

Carbon dioxide (CO2) and hydrogen sulfide (H2S) ordinarily coexist in many industries, being considered as harmful waste gases. Simultaneously converting CO2 and H2S into syngas (a mixture of CO and H2) will be a promising economic strategy for enhancing their recycling value. Herein, a novel one-step conversion of CO2 and H2S to syngas induced by non-thermal plasma with the aid of Ni-Mo sulfide/Al2O3 catalyst under ambient conditions was designed. The as-synthesized catalysts were characterized by using XRD, nitrogen sorption, UV-vis, TEM, SEM, ICP, and XPS techniques. Ni-Mo sulfide/Al2O3 catalysts with various Ni/Mo molar ratios possessed significantly improved catalytic performances, compared to the single-component catalysts. Based on the modifications of the physical and chemical properties of the Ni-Mo sulfide/Al2O3 catalysts, the variations in catalytic activity are carefully discussed. In particular, among all the catalysts, the 5Ni-3Mo/Al2O3 catalyst exhibited the best catalytic behavior with high CO2 and H2S conversion at reasonably low-energy input in non-thermal plasma. This method provides an alternative route for syngas production with added environmental and economic benefits.

Synthesis, Structure, and Heterogeneous Catalysis of a Series of Structurally Diverse Coordination Polymers Based on 5-Nitroisophthalate

“…The deconvoluted Ni 2p spectra of SSICG-3 show two spin–orbit doublets Ni 2p 3/2 (853.67 eV) and Ni 2p 1/2 (871.40 eV) and two satellite bands at 861.50 and 880.22 eV, which confirm Ni 2+ in the as-synthesized sample. After catalysis, the XPS deconvoluted Ni 2p spectra show the Ni 2p 3/2 peak at 854.33 eV and Ni 2p 1/2 peak at 871.43 eV, which confirm that the oxidation state of Ni remains +2. − The compounds SSICG - 1 and 3 were digested using conc. HCl, and atomic adsorption spectroscopy was performed, where Cu (of SSICG - 1 ) and Ni (of SSICG - 3 ) contents were found to be 8.05 % (Cal.…”

Catalytic conversion of sucrose to 1,2-propanediol over alumina-supported Ni–Mo bimetallic catalysts

“…Furthermore, some of the Ni 2+ species also intercalate into the alumina support forming spinel NiAl 2 O 4 , whose presence is also conrmed by the XRD. 39,40 The XPS of the monometallic and other bimetallic combinations of Ni-Mo/g-Al 2 O 3 catalyst is presented in the ESI (Fig. S4 †).…”

Advances in Resources Recovery of H2S: A Review of Desulfurization Processes and Catalysts

“…In addition, Liu et al reported the Ni-Mo sulfide semiconductor materials for nonthermal plasma catalyzed conversion of H 2 S and CO 2 to syngas. 258 Compared with the single-component MoS 2 /Al 2 O 3 and NiS 2 /Al 2 O 3 catalysts, the 5Ni-3Mo/Al 2 O 3 catalyst presented the highest catalytic performance with H 2 S and CO 2 conversion of 95% and 50%, respectively. Besides the thermal and nonthermal plasma methods, the electrochemical conversion of CO 2 and H 2 S to CO and S is also considered to be a thermodynamically feasible method, as shown in eq 43:…”

“…The optimal 5%MoS 2 /Al 2 O 3 hybrid catalyst was kept stable in a 50 h test with a maximum energy conversion efficiency of 1.14 mmol/kJ. In addition, Liu et al reported the Ni-Mo sulfide semiconductor materials for nonthermal plasma catalyzed conversion of H 2 S and CO 2 to syngas . Compared with the single-component MoS 2 /Al 2 O 3 and NiS 2 /Al 2 O 3 catalysts, the 5Ni-3Mo/Al 2 O 3 catalyst presented the highest catalytic performance with H 2 S and CO 2 conversion of 95% and 50%, respectively.…”