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A simple and facile solvothermal method is developed for the preparation of a reduced graphene oxide/NH2-MIL-125(Ti) (rGO–NMTi) hybrid nanocomposite photocatalyst with large specific surface area and thermal stability.

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Ceria-supported Ni/MCM-22 catalysts with weight ratio of Ni:CeO2 (9:0, 9:4, 9:8, 9:12) were prepared by a sol–gel method. The effect of CeO2 on activity and stability of catalysts was evaluated at 700–750 °C with gas hour space velocity of 2.4× 104 mL g–1 h–1. The presence of CeO2 in Ni/MCM-22 suppressed effectively the accumulation of coke on active Ni0 sites via the oxygen storage capacity on the interface between elemental nickel and CeO-Si groups of MCM-22. H2 temperature-programmed reduction results illustrated that CeO2 reduced the interaction between Ni and MCM-22 and increased the high dispersion of Ni nanoparticles, which is easily reducible. The 8CeO2 9Ni/MCM-22 catalyst performed the best at 750 °C with the lowest carbon deposition during time on stream of 60 h, plausibly due to the presence CeO2, which promotes C–H activation. Moreover, the surface oxygen species on the catalyst can interact with the coke generated during reaction to suppress the formation of coke.

To enhance the stability of sorbents during continuous desulphurization-regeneration cycles, KIT-6 with 3D pore channels was used as a support for the sorbents. A series of mesoporous xLayMn/KIT-6 sorbents with different La/Mn atomic ratios were fabricated using a sol-gel method and their desulphurization properties of hot coal gas were investigated at 700-850 °C. 3La97Mn/KIT-6 performed the best at 800 °C with a breakthrough sulphur capacity of 11.56 g sulphur per 100 g sorbent. The eight successive desulphurization (800 °C)-regeneration (600 °C) cycles revealed that 3La97Mn/KIT-6 with endurable regeneration abilities could retain 80% of the initial sulphur capacity. It indicated a better desulphurization performance compared to pure 3La97Mn and 3La97Mn/MCM-41. The fresh and used xLayMn/KIT-6 sorbents were characterized by means of BET, XRD, HRTEM, XPS and H2-TPR techniques. The XRD patterns and HRTEM images of fresh and used 3La97Mn/KIT-6 verified that the utilization of KIT-6 effectively suppressed the aggregation of Mn2O3 particles and improved the stability of the sorbent.

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