Bhattacharyya Kaustava, Kumar Adarsh, Tyagi Deepak, Tripathi A K, Tyagi A K
Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India.
Homi Bhabha National Institute, Mumbai, 400 094, India.
Chemphyschem. 2024 Jun 3;25(11):e202300472. doi: 10.1002/cphc.202300472. Epub 2024 Apr 22.
Catalysts with VO, WO and VO-WO dispersed over TiO were synthesized using sol-gel technique and thoroughly characterized by various techniques. The catalysts were evaluated for degradation of ortho-dichloro benzene (o-DCB) in air/helium, a representative probe molecule for polychlorinated dibenzo-para-dioxin and polychlorinated dibenzofuran by employing in situ Fourier-transform infrared spectroscopy (FT-IR spectroscopy). Different intermediate species formed on the surface of the TiO supported catalysts through of interaction of sorbate molecules with the lattice and/or gaseous oxygen were investigated in detail. Analysis of vibrational bands, observed during sorption of o-DCB and o-DCB-air mixture as a function of temperature over these catalysts, delineated the role of surface intermediate species such as phenolate, enolates, maleates, carboxylates, carbonates in mineralization of o-DCB. Nature and stability of intermediate species, found to be different over these catalysts, were able to elucidate the catalytic activity trend.
采用溶胶-凝胶技术合成了VO、WO和VO-WO负载于TiO上的催化剂，并通过多种技术对其进行了全面表征。通过原位傅里叶变换红外光谱（FT-IR光谱），对这些催化剂在空气/氦气中降解邻二氯苯（o-DCB）进行了评估，o-DCB是多氯代二苯并对二恶英和多氯代二苯并呋喃的代表性探针分子。详细研究了吸附质分子与晶格和/或气态氧相互作用在TiO负载催化剂表面形成的不同中间物种。在这些催化剂上，随着温度变化，对o-DCB和o-DCB-空气混合物吸附过程中观察到的振动带进行分析，揭示了酚盐、烯醇盐、马来酸盐、羧酸盐、碳酸盐等表面中间物种在o-DCB矿化中的作用。在这些催化剂上发现中间物种的性质和稳定性不同，这能够阐明催化活性趋势。
