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Central to this strategy is the ability of CeO2 to undergo reduction and regeneration: its lattice oxygen oxidizes soot, while the oxygen vacancies formed during this process help activate CO2 and restore the catalyst. Pristine CeO2 and aliovalently doped Ce0.9Ni0.1O2\u2212\u03b4 were synthesized via a rapid, single-step solution combustion route and benchmarked for CO2-assisted soot oxidation in a fixed-bed reactor. A suite of techniques establishes that Ni2+ incorporation into the CeO2 fluorite lattice amplifies oxygen vacancy density, enhances lattice oxygen mobility, and markedly improves reducibility. Under inert N2 atmosphere, where lattice oxygen acts as the sole oxidant, the superior reducibility of Ce0.9Ni0.1O2\u2212\u03b4 translates directly into a 75% higher soot conversion compared to pristine CeO2 at 800 \u00b0C, producing CO as the dominant product. Post-reaction XPS confirms a marked drop in Ce4+ content and a surge in oxygen vacancy concentration, providing unambiguous spectroscopic evidence for lattice oxygen consumption via the Mars\u2013van Krevelen mechanism. When CO2 is introduced as oxidant, a remarkable inversion occurs: both catalysts now achieve complete soot oxidation with near-identical light\u2013off profiles, as gas-phase CO2 saturation overrides differences in surface basicity and CO2 adsorption capacity. Crucially, post-reaction XPS under CO2 atmosphere reveals a decrease in oxygen vacancy concentration \u2500 the fingerprint of vacancy replenishment through CO2 dissociation and catalyst self-regeneration. This work opens a tangible pathway for deploying CeO2-based materials as catalytic additives for CO2-driven regeneration in fluid catalytic cracking and related refinery processes, contributing to both carbon utilization and long-term process sustainability.<\/jats:p>","DOI":"10.1021\/acsomega.6c07523","type":"journal-article","created":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T08:01:24Z","timestamp":1790841684000},"page":"61733-61743","source":"Crossref","is-referenced-by-count":0,"title":["CO2 Driven Soot Oxidation via Reverse Boudouard\nReaction over Reducible Catalyst: A Sustainable Pathway for Catalyst\nRegeneration"],"prefix":"10.1021","volume":"11","author":[{"given":"Urmila","family":"Mandal","sequence":"first","affiliation":[{"name":"Birla Institute of Technology and Science Pilani , , Hyderabad Campus , ,","place":["Hyderabad, India, 500078"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1070-2068","authenticated-orcid":true,"given":"Sounak","family":"Roy","sequence":"additional","affiliation":[{"name":"Birla Institute of Technology and Science Pilani , , Hyderabad Campus , ,","place":["Hyderabad, India, 500078"]},{"name":"Birla Institute of Technology and Science Pilani , , Hyderabad Campus , ,","place":["Hyderabad, India, 500078"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,1]]},"reference":[{"issue":"29","key":"2026101315085243600_cit1","doi-asserted-by":"publisher","first-page":"14766","DOI":"10.1021\/acs.langmuir.4c01852","article-title":"Integrated Capture\nand Dry Reforming of CH4 to Syngas: A Review","volume":"40","author":"Bhaskaran","year":"2024","journal-title":"Langmuir"},{"issue":"7","key":"2026101315085243600_cit2","doi-asserted-by":"publisher","first-page":"1048","DOI":"10.1016\/S1872-2067(20)63552-5","article-title":"Regeneration of Catalysts Deactivated by Coke Deposition:\nA Review","volume":"41","author":"Zhou","year":"2020","journal-title":"Chin. 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