Zheng Mingxiao, Zhou Feng, Ma Huixia, Song Xuefeng, Wu Guang
School of Chemistry and Materials Sciences, Research Institute of Crop Science, Heilongjiang University Harbin 150080 China
Dalian Reserch Institute of Petroleum and Petrochemicals, SINOPEC Dalian 116045 China.
RSC Adv. 2024 Nov 15;14(49):36461-36470. doi: 10.1039/d4ra06259k. eCollection 2024 Nov 11.
The selective oxidative dehydrogenation of cyclohexane to cyclohexene was conducted using molybdenum oxide (MoO ) as a catalyst and hydroxyapatite (HAP) and Ca(OH)(PO) as carriers. Two series of MO /HAP catalysts with varying MoO loading capacity and calcination temperature were prepared the co-impregnation method. The impact of dispersibility and chemical environment on the catalytic performance of MoO was investigated. The catalysts were characterized using XRD, XPS, H-TPR, and UV-Vis spectra. These MoO /HAP catalysts were employed for the oxidative dehydrogenation (ODH) of cyclohexane to cyclohexene. MoO /HAP catalysts with lower loading capacity exhibited higher dispersion of MoO and selectivity towards cyclohexane. The calcination temperature directly influenced the chemical environment of MoO , thereby affecting its catalytic performance. Samples calcinated at lower temperatures (500 °C and 600 °C) demonstrated higher conversion rates for cyclohexane, while samples calcinated at higher temperatures (above 700 °C) displayed greater selectivity towards cyclohexane. At 430 °C, when the conversion rate of cyclohexane reached 13.1%, the selectivity of cyclohexene over MHAP-0.05-800 catalyst reached 58.2%.
以氧化钼（MoO ）为催化剂，羟基磷灰石（HAP）和Ca(OH)(PO)为载体，进行环己烷选择性氧化脱氢制环己烯的反应。采用共浸渍法制备了两组不同氧化钼负载量和煅烧温度的MO /HAP催化剂。研究了分散性和化学环境对氧化钼催化性能的影响。采用XRD、XPS、H-TPR和紫外可见光谱对催化剂进行了表征。将这些MoO /HAP催化剂用于环己烷氧化脱氢（ODH）制环己烯的反应。负载量较低的MoO /HAP催化剂表现出较高的氧化钼分散性和对环己烷的选择性。煅烧温度直接影响氧化钼的化学环境，从而影响其催化性能。在较低温度（500℃和600℃）下煅烧的样品对环己烷表现出较高的转化率，而在较高温度（700℃以上）下煅烧的样品对环己烷表现出更高的选择性。在430℃时，当环己烷转化率达到13.1%时，MHAP-0.05-800催化剂上环己烯的选择性达到58.2%。
