Synthesis Gas Production by Partial Oxidation of Methane and Dry Reforming of Methane in the Presence of Novel Ni–Co/MFI Catalysts

Determination of Zn Speciation, Siting, and Distribution in Ferrierite Using Luminescence and FTIR Spectroscopy

“…In our previous works, we showed that the application of a multispectroscopic approach based on the combination of FTIR, UV–vis spectroscopy, Mössbauer spectroscopy, and luminescence spectroscopy can be successfully applied for characterization of the nature of TMI species of Co, Ni, Mn, Cu, and Fe embedded in zeolite matrices. − Due to increasing applications of Zn-containing catalysts in hydrocarbon and redox processes the development of a characterization tool for the structure determination, oxidation state, and reactivity of particular Zn species formed in zeolites is of high importance. Also, TMI-containing zeolites of FER structure, exhibiting high performance in catalytic reactions including methane oxidation by O 2 , are attracting much attention. , In the oxidation reactions studied in the works, ,− M 2+ located in cationic positions were suggested as active sites. Therefore, in this work, we analyze the nature of Zn species occurring in the ferrierite (FER) matrix in the Zn concentration range of 0.04–0.33 Zn/Al.…”

Smart Designs of Zeolite-Based Catalysts for Dry Reforming of Methane: A Review

“…126 In addition to the impregnation, microwave-assisted hydrothermal treatment was introduced into the zeolite synthesis, saving the energy consumption and time required in an environmentally friendly way. 113,127 Benefiting from rapid microwave heating, both the nucleation and crystal growth were improved. Moreover, the dominant ultramicroporous structure after DRM reaction suggested a stable texture of the MFI zeolite catalysts, resulting in an strong coke resistance.…”

“…Moreover, the dominant ultramicroporous structure after DRM reaction suggested a stable texture of the MFI zeolite catalysts, resulting in an strong coke resistance. 102,127 Besides the microwave heating, sonication favored a highly dispersed zeolite and metal oxide nanoparticles due to the ultrasound energy, inhibiting the metal sintering and obtaining a small particle size. 128 Meanwhile, the production efficiency was enhanced with this convenient and simple method benefiting from the increased adsorption of CH 4 molecules.…”

“…As a result of the uniform Ni distribution and small particle size, the Ni/MFI catalyst prepared with wetness impregnation delivered a higher conversion and less coke deposition . In addition to the impregnation, microwave-assisted hydrothermal treatment was introduced into the zeolite synthesis, saving the energy consumption and time required in an environmentally friendly way. , Benefiting from rapid microwave heating, both the nucleation and crystal growth were improved. Moreover, the dominant ultramicroporous structure after DRM reaction suggested a stable texture of the MFI zeolite catalysts, resulting in an strong coke resistance. , Besides the microwave heating, sonication favored a highly dispersed zeolite and metal oxide nanoparticles due to the ultrasound energy, inhibiting the metal sintering and obtaining a small particle size .…”

Advanced zeolite and ordered mesoporous silica-based catalysts for the conversion of CO2to chemicals and fuels

“…836,910,911 Following these approaches, Ni, Co, and Ni–Co supported on ZSM-5 synthesized by the microwave assisted hydrothermal method (ZSM-5 mw ) and on the commercial sample (ZSM-5 HT ) were prepared and used as catalysts for POM and DRM processes to syngas production. 912 The Ni and Ni–Co based ZSM-5 mw and based ZSM-5 HT catalysts exhibited high catalytic activity for POM and DRM processes with a low 2 wt% of the metal content with a syngas yield up to 97% in the temperature range of 850–950 °C (Table 11, entries 78–80). The simultaneous presence of Ni and Co increased the resistance to coke deposition for the DRM reaction and prevented the formation of carbon fibres usually observed on Ni catalysts.…”