CO methanation toward the production of synthetic natural gas over highly active Ni/TiO₂ catalyst

Abstract

in Wiley Online Library (wileyonlinelibrary.com)The sonochemical synthesis and characterization of highly active and stable Ni nanoparticles supported on TiO 2 as a CO methanation catalyst for the production of synthetic natural gas are reported. The catalyst synthesized by sonication showed higher activity for CH 4 formation than the catalyst synthesized via the conventional wet impregnation method. The activation energy was found to be 79 and 94 kJ mol 21 for the catalyst synthesized with sonication and wet impregnation method, respectively. The combined results of x-ray photoelectron spectroscopy and x-ray diffraction show that the enhancement in activity of the sample synthesized by sonication method is due to partial substitution of Ni in TiO 2 lattice. This creates oxide vacancies and facilitates hydrogen adsorption and spillover from nickel to support. H 2temperature-programmed reduction study corroborates the intimate contact of Ni with support, thus rendering strong metal support interactions. The mechanism involving Langmuir-Hinshelwood kinetics with hydrogen-assisted CO dissociation was used to correlate experimental data.The catalytic activity measurement was performed at atmospheric pressure in a tubular quartz reactor (4-mm ID and length of 30 cm) over 0.5 g of catalyst (40-80 mesh) Figure 4. H 2 -TPR profile for (a) 23%Ni/TiO 2 (imp), (b) 23%Ni/TiO 2 (sonic), and (c) nickel oxide.Figure 5. Percentage (a) CO conversion, (b) CH 4 selectivity, and (c) CH 4 yield plot on various TiO 2modified catalysts.

Core-Shell Structured Ni@SiO2 Catalysts Exhibiting Excellent Catalytic Performance for Syngas Methanation Reactions

“…The first weight loss was observed below 400 • C due to the removal of organic components and physically adsorbed water molecules. The second weight loss observed could be associated to the oxidation of graphitized C species occurred in the 400-600 • C range [26,27]. In the TGA test temperature range, the weight of the Ni@SiO 2 catalyst sample reduces approximately by 8.94%, which could be attributed to the production of C that probably causes reduction in catalyst activity as obtained in the performance test.…”

CO hydrogenation combined with water-gas-shift reaction for synthetic natural gas production: a thermodynamic and experimental study

“…CO $ CH 4 ? H 2 O) (Shinde and Madras 2014;Wang et al 2015). The CO methanation reaction is a key process for increasing SNG production (Meng et al 2015b;Götz et al 2016;Gao et al 2016).…”

Assembly of ordered mesoporous alumina-supported nickel nanoparticles with high temperature stability for CO methanation

“…The improved catalytic performance was attributed to the matrix of the OMA, which effectively improved the dispersion of the nickel particles, and prevented the Ni NPs from sintering, via a particle migration and coalescence mechanism. The Ni-OMA catalyst demonstrated here shows promise for high-temperature methanation.The production of substitute natural gas (SNG) from coal and biomass is significant in areas such as China and India where the available quantity of domestic natural gas cannot meet the enormous demand [1]. SNG is typically produced via the gasification of feedstock and CO methanation reaction.…”

“…The production of substitute natural gas (SNG) from coal and biomass is significant in areas such as China and India where the available quantity of domestic natural gas cannot meet the enormous demand [1]. SNG is typically produced via the gasification of feedstock and CO methanation reaction.…”

“…For example, in Topsøe's recycle energy-efficient methanation process (TREMP), the exit temperature at the point after the first methanation reactor is approximately 650-700°C [3]. Practical methanation 1 Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China 2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China * Corresponding author (email: jlgong@tju.edu.cn) catalysts therefore need to be resistant to both sintering and coking at high temperature [4].…”