{"corpus_id":246335394,"paper_sha":"d586f110634852be703647203baddbdebde2d377","doi":"10.3390/catal12020145","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":null,"dblp_id":null,"acl_id":null,"title":"Green Epoxidation of Olefins with ZnxAl/MgxAl-LDH Compounds: Influence of the Chemical Composition","year":2022,"publication_date":"2022-01-24","venue":"Catalysts","journal":{"name":"Catalysts","pages":null,"volume":null},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":[],"reference_count":44,"citation_count":6,"influential_citation_count":0,"is_open_access":true,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":"https://www.mdpi.com/2073-4344/12/2/145/pdf?version=1643103306","s2_open_access_landing_url":"https://www.semanticscholar.org/paper/d586f110634852be703647203baddbdebde2d377","s2_open_access_license":"CCBY","s2_open_access_status":"GOLD","pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"This contribution concerns the effect of the chemical composition of the brucite-type layer of bi-cationic LDH materials ZnxAl and MgxAl (x = 2–5) and tri-cationic LDH MgyZnzAl (y + z = 4, y = 1, 2, 3) on their catalytic activity for olefin epoxidation with H2O2 in the presence of acetonitrile. LDH materials were prepared by the standard method of co-precipitation at constant pH 10, using an aqueous solution of the corresponding metal nitrates and a basic solution containing NaOH and Na2CO3. The fresh LDHs were calcined to yield the corresponding mixed oxides and then the recovery of the LDH structure by hydration of the mixed oxides was performed. The resulting samples were characterized by AAS, XRD, DRIFT, DR-UV–Vis, BET and determination of basic sites. The results of the catalytic tests for olefin epoxidation were well correlated with the basicity of the samples, which was in turn related to the M2+/Al3+ ratio and the electronegativity of different bivalent metals in the brucite-type layer.","claims":[{"public_id":"cl_095debe1a376999914d971c31e6ee0f4","status":"active","text":"Catalytic activity for olefin epoxidation with hydrogen peroxide in acetonitrile depends on the chemical composition of the brucite-type layer in ZnxAl and MgxAl layered double hydroxides and in tri-cationic MgyZnzAl materials.","confidence":0.96,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_095debe1a376999914d971c31e6ee0f4"},{"public_id":"cl_6981c43a60b6ff18f49858c46f9e7d77","status":"active","text":"Catalytic test results correlate with the basicity of the samples.","confidence":0.94,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_6981c43a60b6ff18f49858c46f9e7d77"},{"public_id":"cl_b6b0498f7fb9b5e183283b24ff65e52f","status":"active","text":"Layered double hydroxide materials were prepared by co-precipitation at constant pH 10, calcined to mixed oxides, and then subjected to hydration to recover the layered double hydroxide structure.","confidence":0.91,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_b6b0498f7fb9b5e183283b24ff65e52f"},{"public_id":"cl_dc9e0d3685a4b45a166a140eaf3a7d07","status":"active","text":"Sample basicity is related to the M2+/Al3+ ratio and to the electronegativity of the bivalent metals in the brucite-type 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