NiO/EVM催化剂的制备及其在秸秆热解中的应用.

Expanded vermiculite (EVM) was used as a carrier to prepare NiO/EVM catalyst by homogeneous precipitation method. The different approaches including XRF, XRD, SEM, and BET were used to characterize the synthetic catalysts. The effects of calcination temperature, pyrolysis temperature, holding time, nickel loading and cycle times on the catalytic pyrolysis of straw to syngas were investigated. The results indicated that the active components of the NiO/ EVM catalyst was well loaded, uniformly dispersed, and with a specific surface area of 23.1 m²/ g. The NiO/EVM catalyst had the best catalytic efficiency at the calcination temperature was 400°C, the pyrolysis temperature was 800°C, the nickel loading was 20%, and a 20 min hold time. Compared with the pyrolysis without catalyst, the concentration of H2 and CO increased significantly from 21.20% to 36.76% and 27.13% to 35. 93%, respectively. After 6 consecutive regeneration cycles, the content of syngas was still relatively increased by 36. 5%. [ABSTRACT FROM AUTHOR]