{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Li W"],"funding":["National Natural Science Foundation of China"],"pagination":["12908-12919"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC9051219"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["10(22)"],"pubmed_abstract":["The catalytic reduction of NO with NH<sub>3</sub> (NH<sub>3</sub>-SCR) on phosphorus-doped carbon aerogels (P-CAs) was studied in the temperature range of 100-200 °C. The P-CAs were prepared by a one-pot sol-gel method by using phosphoric acid as a phosphorus source followed by carbonization at 600-900 °C. A correlation between catalytic activity and surface P content is observed. The P-CA-800<sub>vac</sub> sample obtained <i>via</i> carbonization at 800 °C and vacuum treatment at 380 °C shows the highest NO conversion of 45.6-76.8% at 100-200 °C under a gas hourly space velocity of 500 h<sup>-1</sup> for the inlet gas mixture of 500 ppm NO, 500 ppm NH<sub>3</sub> and 5.0 vol% O<sub>2</sub>. The coexistence of NH<sub>3</sub> and O<sub>2</sub> is essential for the high conversion of NO on the P-CA carbon catalysts, which can decrease the spillover of NO<sub>2</sub> and N<sub>2</sub>O. The main Brønsted acid sites derived from P-doping and contributed by the C-OH group at edges of carbon sheets are beneficial for NH<sub>3</sub> adsorption. In addition, the C<sub>3</sub>-P[double bond, length as m-dash]O configuration seems to have the most active sites for favorable adsorption and dissociation of O<sub>2</sub> and facilitates the formation of NO<sub>2</sub>. Therefore, the simultaneous presence of acidic groups for NH<sub>3</sub> adsorption and the C<sub>3</sub>-P[double bond, length as m-dash]O active sites for NO<sub>2</sub> generation due to the activation of O<sub>2</sub> molecules is likely responsible for the significant increase in the NH<sub>3</sub>-SCR activity over the P-CAs. The transformation of C<sub>3</sub>-P[double bond, length as m-dash]O to C-O-P functional groups after the reaction is found, which could be assigned to the oxidation of C<sub>3</sub>-P[double bond, length as m-dash]O by the dissociated O*, resulting in an apparent decrease of catalytic activity for P-CAs. The C-O-P based functional groups are also active in the NH<sub>3</sub>-SCR reaction."],"journal":["RSC advances"],"pubmed_title":["Insights into the promotion role of phosphorus doping on carbon as a metal-free catalyst for low-temperature selective catalytic reduction of NO with NH<sub>3</sub>."],"pmcid":["PMC9051219"],"funding_grant_id":["U1710252"],"pubmed_authors":["Li W","Qiao W","Liu Y","Jin S","Yang M","Jin M","Ling L","Wang H","Zhang R","Wei Y","Wang J","Yang S"],"additional_accession":[]},"is_claimable":false,"name":"Insights into the promotion role of phosphorus doping on carbon as a metal-free catalyst for low-temperature selective catalytic reduction of NO with NH<sub>3</sub>.","description":"The catalytic reduction of NO with NH<sub>3</sub> (NH<sub>3</sub>-SCR) on phosphorus-doped carbon aerogels (P-CAs) was studied in the temperature range of 100-200 °C. The P-CAs were prepared by a one-pot sol-gel method by using phosphoric acid as a phosphorus source followed by carbonization at 600-900 °C. A correlation between catalytic activity and surface P content is observed. The P-CA-800<sub>vac</sub> sample obtained <i>via</i> carbonization at 800 °C and vacuum treatment at 380 °C shows the highest NO conversion of 45.6-76.8% at 100-200 °C under a gas hourly space velocity of 500 h<sup>-1</sup> for the inlet gas mixture of 500 ppm NO, 500 ppm NH<sub>3</sub> and 5.0 vol% O<sub>2</sub>. The coexistence of NH<sub>3</sub> and O<sub>2</sub> is essential for the high conversion of NO on the P-CA carbon catalysts, which can decrease the spillover of NO<sub>2</sub> and N<sub>2</sub>O. The main Brønsted acid sites derived from P-doping and contributed by the C-OH group at edges of carbon sheets are beneficial for NH<sub>3</sub> adsorption. In addition, the C<sub>3</sub>-P[double bond, length as m-dash]O configuration seems to have the most active sites for favorable adsorption and dissociation of O<sub>2</sub> and facilitates the formation of NO<sub>2</sub>. Therefore, the simultaneous presence of acidic groups for NH<sub>3</sub> adsorption and the C<sub>3</sub>-P[double bond, length as m-dash]O active sites for NO<sub>2</sub> generation due to the activation of O<sub>2</sub> molecules is likely responsible for the significant increase in the NH<sub>3</sub>-SCR activity over the P-CAs. The transformation of C<sub>3</sub>-P[double bond, length as m-dash]O to C-O-P functional groups after the reaction is found, which could be assigned to the oxidation of C<sub>3</sub>-P[double bond, length as m-dash]O by the dissociated O*, resulting in an apparent decrease of catalytic activity for P-CAs. The C-O-P based functional groups are also active in the NH<sub>3</sub>-SCR reaction.","dates":{"release":"2020-01-01T00:00:00Z","publication":"2020 Mar","modification":"2024-11-14T02:11:40.776Z","creation":"2024-11-14T02:11:40.776Z"},"accession":"S-EPMC9051219","cross_references":{"pubmed":["35492121"],"doi":["10.1039/d0ra01654c"]}}