Khaleel Abbas, Nawaz Muhammad
Department of Chemistry, United Arab Emirates University, P.O. Box 17551, Al-Ain, Abu Dhabi, United Arab Emirates.
Department of Chemistry, United Arab Emirates University, P.O. Box 17551, Al-Ain, Abu Dhabi, United Arab Emirates.
J Environ Sci (China). 2015 Mar 1;29:199-209. doi: 10.1016/j.jes.2014.09.032. Epub 2015 Feb 3.
High-surface-area mesoprous powders of γ-Al2O3 doped with Cu2+, Cr3+, and V3+ ions were prepared via a modified sol-gel method and were investigated as catalysts for the oxidation of chlorinated organic compounds. The composites retained high surface areas and pore volumes comparable with those of undoped γ-Al2O3 and the presence of the transition metal ions enhanced their surface acidic properties. The catalytic activity of the prepared catalysts in the oxidation of 1,2-dichloroethane (DCE) was studied in the temperature range of 250-400°C. The catalytic activity and product selectivity were strongly dependent on the presence and the type of dopant ion. While Cu2+- and Cr3+-containing catalysts showed 100% conversion at 300°C and 350°C, V3+-containing catalyst showed considerably lower conversion. Furthermore, while the major products of the reactions over γ-alumina were vinyl chloride (C2H3Cl) and hydrogen chloride (HCl) at all temperatures, Cu- and Cr-doped catalysts showed significantly stronger capability for deep oxidation to CO2.
通过改进的溶胶-凝胶法制备了掺杂Cu2+、Cr3+和V3+离子的高比表面积介孔γ-Al2O3粉末，并将其作为氧化氯化有机化合物的催化剂进行了研究。这些复合材料保留了与未掺杂的γ-Al2O3相当的高比表面积和孔体积，过渡金属离子的存在增强了它们的表面酸性。在250-400°C的温度范围内研究了制备的催化剂对1,2-二氯乙烷（DCE）氧化的催化活性。催化活性和产物选择性强烈依赖于掺杂离子的存在和类型。含Cu2+和Cr3+的催化剂在300°C和350°C时显示出100%的转化率，而含V3+的催化剂显示出相当低的转化率。此外，虽然在所有温度下γ-氧化铝上反应的主要产物是氯乙烯（C2H3Cl）和氯化氢（HCl），但掺杂Cu和Cr的催化剂显示出更强的深度氧化为CO2的能力。
