Abstract

The interaction between hydrogen and subnanometer deposited Pt–ReO_x particles active in dehydrogenation of carboxylic acids is investigated via in situ diffuse reflectance IR spectroscopy. Absorption bands of platinum hydrides are detected in the range of 2025–2043 cm⁻¹, and their high reactivity with respect to adsorbed acetic acid is revealed. The absorption band of platinum hydride shifts toward higher frequencies and becomes more intense, due to the effect of adjacent acetates on the electron state of platinum. It is established that in a hydrogen medium the intensity of platinum hydride bands sharply increases after the adsorption of acetic acid and then gradually decreases owing to the reaction of the hydrides with surface acetates.

中文翻译：

---

Pt-ReO x / TiO 2催化剂上乙酸选择性加氢中铂氢化物的反应性

摘要

通过原位漫反射红外光谱研究了氢与亚纳米级沉积的Pt-ReO _x粒子之间的相互作用，该粒子在羧酸的脱氢中具有活性。检测到氢化铂的吸收带在2025–2043 cm ^-1的范围内，并且显示出它们对乙酸的高反应活性。由于相邻的乙酸盐对铂的电子态的影响，氢化铂的吸收带向更高的频率移动并变得更强。已经确定，在氢介质中，氢化铂带的强度在吸附乙酸后急剧增加，然后由于氢化物与表面乙酸盐的反应而逐渐减小。