Nitrogen doped carbon for Pd-catalyzed hydropurification of crude terephthalic acid: roles of nitrogen species. Issue 53 (14th October 2021)

• Record Type: Journal Article
• Authors: He, Limin; Wang, Yangdong; Gao, Huanxin; Liu, Zhicheng; Xie, Zaiku
• Is Part Of: RSC advances. Volume 11:Issue 53(2021)
• Page Start: 33646
• Page End: 33652
• Publication Date: 2021-10-14
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra06479g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Pd on N doped activated carbon exhibited increased activity and stability in 4-CBA hydrogenation relative to Pd catalysts without N doping. Higher dispersion of Pd 0 and facile activation of H2 accounted for the better activity of Pd/NC. Abstract : The purification of crude terephthalic acid was performed by the hydrogenation of 4-carboxybenzaldehyde (4-CBA) over activated carbon (AC) supported Pd catalysts in industry. However, traditional Pd/AC catalysts usually suffer from low hydrogenation activity and poor thermal stability. Herein, nitrogen was incorporated into AC via a simple hydrothermal treatment of AC with urea as the nitrogen resource. The N doped AC contained pyridinic N, pyrrolic N, graphitic N and oxidized N. Wide characterizations revealed that N doping not only effectively improved the dispersion of Pd NPs but also increased the proportion of Pd 0 . In addition, N doping also enhanced the dissociative adsorption capacity of molecular hydrogen. More importantly, the resistance to sintering of Pd NPs was efficiently suppressed after N doping. As a result, N doped AC supported Pd showed both higher activity and better thermal stability than the N-free one.