Graphical Abstract
![](https://wqketang.oss-cn-beijing.aliyuncs.com/unzip/large-zip/zip-b156f486-c275-4699-a6a2-4be656e52b3b/4180/files/4180-TOC.jpg?Expires=1725755431&OSSAccessKeyId=STS.NTb4DXU4JD36Bm7sCfLXpJ6m3&Signature=HrpBX3TUmXmOojILz6Gp0azMUiY%3D&security-token=CAISywJ1q6Ft5B2yfSjIr5fXf%2F7suOtr8%2FHdQEuGl0MzQNdcpfPG0Tz2IHtKenhsBOsbtfk1mG5W5%2FgZlqJ9SptIAEfJa9d99MznDrFDltCT1fau5Jko1beHewHKeTOZsebWZ%2BLmNqC%2FHt6md1HDkAJq3LL%2Bbk%2FMdle5MJqP%2B%2FUFB5ZtKWveVzddA8pMLQZPsdITMWCrVcygKRn3mGHdfiEK00he8TouufTinpHMskGA1Aell7Mvyt6vcsT%2BXa5FJ4xiVtq55utye5fa3TRYgxowr%2Fwo0v0YpGya5YzHXwcPskvdKZbo78UqLQlla6w%2BGqFJqvPxr%2Fp8t%2Fx5fWJKAezhVgs8cVM8JOjIqKOscIsi5g%2Fq6gWPcD1LXoQ6vH1ZZ5%2FAzVZaVWUEMpNqcRxTMldXaQqhSZT8m3upKXzOJeX7ls9%2Fv%2FV7p7UvocvUTzDnGoABCKEw5zeqVEFt1P1tLtZPWFgqoxMOwG7QFDd16KVAW84FGRPy%2BnneCrZe0HYm786BcWDP3XmPmuNohvQFG%2FYf9X49aXiJQs6eJFt93A5NT8dSRXVX3d0gsHp4aPRQxBXChZPaPyC91ZpQadlfhy79dcqC4544nSt5yl%2BptAu%2FCNkgAA%3D%3D)
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Highly dispersed Ni catalyst and alkaline promoters supported by mesoporous SiO2 nanospheres were synthesized and applied as an active and stable catalyst for dry reforming of methane (DRM). The as-prepared Ni/MgO-mSiO2 catalyst showed stable conversions of CH4 and CO2 around 82% and 85% in 120 h of DRM reaction, which was superior in performance compared to similar catalysts in literatures. Based on the transmission electron microscope (TEM) images, energy-dispersive spectroscopy (EDS), CO-pulse adsorption, temperature programmed reduction of the oxidized catalysts by hydrogen (H2-TPR), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of CO2 (CO2-TPD), and thermal gravitational analysis (TGA), the promotion effect of MgO on the Ni catalyst was systematically studied. The introduction of Mg2+ in synthesis enhanced the interaction between Ni2+ and mSiO2, which led to a high dispersion of active centers and a strong “metal–support” interactions to inhibit the sintering and deactivation of Ni at reaction temperatures. On the other hand, Ni and MgO nanoparticles formed adjacently on mSiO2, where the “Ni-MgO” interface not only improved the Ni0 distribution and promoted the cracking of CH4 but also promoted the activation of CO2 and the elimination of carbon deposits. A high and stable conversion of CH4 and CO2 were then achieved through the synergistic effect of Ni catalyst, MgO promoter, and mSiO2 support.
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