碳化钼/β沸石的制备及其催化大豆油加氢脱羧性能

Preparation and Catalytic Performance of Mo_2C/β Zeolite for Hydrodecarboxylation of Soybean Oil

以MoO3为前驱体、改性β沸石为载体,采用程序升温还原法制备了Mo2C/β沸石催化剂,并对催化剂进行了XRD和TEM表征,考察了还原条件对催化剂性能的影响。在小型固定床反应装置上进行了大豆油加氢反应。结果表明,随着程序升温速率降低,β-Mo2C的衍射峰强度增强。随着碳化终温升高,碳化程度逐渐加深。当程序升温速率为1℃/min,碳化终温为650℃时,β-Mo2C的衍射峰最清晰。以正己烷作为碳源,Mo2C在载体上分散均匀,具有较大的比表面。采用Mo2C负载量为21.25%的Mo2C/β沸石为催化剂,在压力为3.5MPa、液时空速0.5h-1、氢油体积比500、反应温度280、320℃的条件下,大豆油经过加氢后,凝点下降到-5～-10℃,十六烷值保持在70以上。

Mo2C/β zeolite catalysts were prepared using temperature-programmed reduction method with MoO3 as precursor and modified β zeolite as carrier and characterized by XRD and TEM. The effects of reduction conditions on the catalyst performance were investigated. Hydrogenation of soybean oil was carried out in small fixed bed reactor. The results show that with temperature programming rate decreased, the diffraction peak intensity of β-Mo2C increased. With the final carbonization temperature increased, carbonation level gradually deepened. When the temperature programming rate of 1 ℃ / min and final temperature of carbonization of 650 ℃, β-Mo2C diffraction peak was moet clearest. With hexane as carbon source, Mo2C uniformly dispersed on the carrier, with a high surface area. Using Mo2C / β zeolite Loading 21.25% Mo2C as catalyst, under the condition of reaction pressure 3.5 MPa, space velocity 0.5 h^-1, volume ratio of hydrogen to oil 500, reaction temperature 280 ℃ and 320 ℃, The pour point of hydrogenated soybean oil decreased down to -5- -10 ℃ and the cetane number kept more than 70.