铂（111）表面碳和氮原子耦合形成表面氰基。

Formation of surface CN from the coupling of C and N atoms on Pt(111).

作者信息

Herceg Eldad, Trenary Michael

机构信息

Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061, USA.

出版信息

J Am Chem Soc. 2003 Dec 24;125(51):15758-9. doi: 10.1021/ja037612e.

DOI:10.1021/ja037612e

PMID:14677962

Abstract

Reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption have been used to study the coupling of C and N atoms on Pt(111) to form surface CN. This reaction underlies the important synthesis of HCN from methane and ammonia over platinum catalysts. Since CH4 and NH3 do not thermally dissociate on Pt(111) under ultrahigh vacuum conditions, we used CH3I and electron bombardment of NH3 to generate reactive surface species. Surface CN is formed at a temperature of 500 K from surface Nads and Cads atoms. The presence of surface CN is detected by HCN desorption and through the reaction of hydrogen with CNads to form a surface >CNH2 (aminocarbyne) species, which has a characteristic RAIR spectrum.

摘要

反射吸收红外光谱（RAIRS）和程序升温脱附已被用于研究Pt(111)上C和N原子的耦合以形成表面CN。该反应是甲烷和氨在铂催化剂上重要合成HCN的基础。由于在超高真空条件下CH4和NH3不会在Pt(111)上发生热解离，我们使用CH3I和对NH3进行电子轰击来产生反应性表面物种。表面CN在500 K的温度下由表面吸附的N原子和C原子形成。通过HCN脱附以及通过氢与吸附的CN反应形成表面>CNH2（氨基卡宾）物种来检测表面CN的存在，该物种具有特征性的RAIR光谱。