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Produced from renewable biomass through pyrolysis, biochar possesses key features\u2014such as high surface area, rich porosity and tunable surface chemistry\u2014that make it particularly suited for heterogeneous catalysis. This review highlights recent advances in the use of biochar-derived catalysts for key CO2 conversion reactions, focusing on cycloaddition to epoxides, dry reforming of methane and catalytic biomass upgrading. Emphasis is given to the role of biochar\u2019s origin and preparation methods, which critically influence its structure, surface functionality and catalytic performance. Feedstocks rich in mineral content or oxygenated groups, for instance, can enhance CO2 activation and product selectivity. Furthermore, tailored modifications\u2014such as doping with heteroatoms or supporting metal nanoparticles\u2014further boost catalytic activity and stability by tuning acid\u2013base behavior, while maintaining low toxicity and cost-effectiveness. Compared to conventional catalysts, biochar-based systems offer advantages in low cost, recyclability and resistance to deactivation. Challenges remain in standardizing production methods, controlling structural variability, minimizing metal leaching and scaling up. This review presents biochar as a versatile, renewable platform for CO2 utilization, highlighting the importance of rational design, feedstock selection and functionalization strategies for developing efficient, sustainable catalytic systems, in line with green chemistry and circular economy principles.<\/jats:p>","DOI":"10.3390\/catal15060568","type":"journal-article","created":{"date-parts":[[2025,6,9]],"date-time":"2025-06-09T06:46:01Z","timestamp":1749451561000},"page":"568","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Biochar-Based Materials for Catalytic CO2 Valorization"],"prefix":"10.3390","volume":"15","author":[{"given":"Shahab","family":"Zomorodbakhsh","sequence":"first","affiliation":[{"name":"CQC\u2014Coimbra Chemistry Centre, Department of Chemistry, University of Coimbra, Rua Larga 2, 3004-535 Coimbra, Portugal"}]},{"given":"Lucas D.","family":"Dias","sequence":"additional","affiliation":[{"name":"CQC\u2014Coimbra Chemistry Centre, Department of Chemistry, University of Coimbra, Rua Larga 2, 3004-535 Coimbra, Portugal"},{"name":"Laborat\u00f3rio de Novos Materiais, Universidade Evang\u00e9lica de Goi\u00e1s, An\u00e1polis 75083-515, GO, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2094-4781","authenticated-orcid":false,"given":"M\u00e1rio J. F.","family":"Calvete","sequence":"additional","affiliation":[{"name":"CQC\u2014Coimbra Chemistry Centre, Department of Chemistry, University of Coimbra, Rua Larga 2, 3004-535 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1176-9064","authenticated-orcid":false,"given":"Andreia F.","family":"Peixoto","sequence":"additional","affiliation":[{"name":"LAQV-REQUIMTE, Faculdade de Ci\u00eancias, Departamento de Qu\u00edmica e Bioqu\u00edmica, Universidade de Porto, Rua do Campo Alegre s\/n, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9923-359X","authenticated-orcid":false,"given":"Rui M. B.","family":"Carrilho","sequence":"additional","affiliation":[{"name":"CQC\u2014Coimbra Chemistry Centre, Department of Chemistry, University of Coimbra, Rua Larga 2, 3004-535 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4958-7677","authenticated-orcid":false,"given":"Mariette M.","family":"Pereira","sequence":"additional","affiliation":[{"name":"CQC\u2014Coimbra Chemistry Centre, Department of Chemistry, University of Coimbra, Rua Larga 2, 3004-535 Coimbra, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,8]]},"reference":[{"key":"ref_1","first-page":"253","article-title":"Production, activation, and applications of biochar in recent times","volume":"2","author":"Sakhiya","year":"2020","journal-title":"Catalysts"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Conte, P., Bertani, R., Sgarbossa, P., Bambina, P., Schmidt, H.-P., Raga, R., Lo Papa, G., Chillura Martino, D.F., and Lo Meo, P. (2021). 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