采用等体积浸渍法制备了2%Pt/10%MoO_3-ZrO_2双功能固体催化剂,通过XRD、BET、CO化学吸附、NH3-TPD等手段对催化剂组成、结构和性质进行了表征,并以乙二醇为模型分子研究了2%Pt/10%MoO_3-ZrO_2催化下多元醇水相加氢脱氧过程中的反应动...采用等体积浸渍法制备了2%Pt/10%MoO_3-ZrO_2双功能固体催化剂,通过XRD、BET、CO化学吸附、NH3-TPD等手段对催化剂组成、结构和性质进行了表征,并以乙二醇为模型分子研究了2%Pt/10%MoO_3-ZrO_2催化下多元醇水相加氢脱氧过程中的反应动力学特性。结果表明,2%Pt/10%MoO_3-ZrO_2对乙二醇的水相加氢脱氧(HDO)反应具有较好的催化活性和选择性,乙二醇水相HDO反应对乙二醇服从一级反应动力学规律,反应活化能为17.2 k J/mol,与其竞争的重整反应的活化能为111.4 k J/mol。较低的反应温度更有利于提高乙二醇水相HDO的选择性,适宜的反应条件为210℃,5.5 MPa H2,催化剂用量为乙二醇的10%。在此条件下,乙二醇转化率12.5%,HDO产物选择性96.1%。展开更多
A nanoporous MoO3/ZrO2 mixed oxide was hydrothermally synthesized by hydrolyzing zirconium isopropoxide in the presence of a cationic surfactant, eetyltrimethylammonium bromide（CTAB）. The crystal structure and the a...A nanoporous MoO3/ZrO2 mixed oxide was hydrothermally synthesized by hydrolyzing zirconium isopropoxide in the presence of a cationic surfactant, eetyltrimethylammonium bromide（CTAB）. The crystal structure and the acidity of the obtained nanoporous MoO3/ZrO2 mixed oxide were determined by means of XRD, N2 adsorption-desorption and NH3-TPD, respectively. The isobutane/butene alkylation over the MoO3/ZrO2 catalyst was carried out in a fixed bed reactor. The results reveal that ZrO2 in MoO3/ZrO2 exists mainly in the tetragonal phase, and the catalyst samples possess large specific surface areas as well as moderate acidity for isobutane/butene alkylation. Compared with samples prepared by impregnation and sol-gel processes, MoO3/ZrO2 mixed oxide samples prepared in this work have a better catalytic activity.展开更多
以硝酸为溶剂,氢氧化钠为沉淀剂,采用共沉淀法,制备了一系列不同M O含量的Cu-M O O3-ZrO2催化剂,并采用X射线粉末衍射(XRD)、N2吸脱附(BET)以及程序升温还原(TPR)对催化剂结构进行了表征.研究该催化剂在二乙醇胺脱氢合成亚氨基二乙酸反...以硝酸为溶剂,氢氧化钠为沉淀剂,采用共沉淀法,制备了一系列不同M O含量的Cu-M O O3-ZrO2催化剂,并采用X射线粉末衍射(XRD)、N2吸脱附(BET)以及程序升温还原(TPR)对催化剂结构进行了表征.研究该催化剂在二乙醇胺脱氢合成亚氨基二乙酸反应中的催化性能,考察Cu-M O O3-ZrO2的反应条件对二乙醇胺脱氢反应性能的影响.结果表明,共沉淀制备的Cu-M O O3-ZrO2催化剂(摩尔比为Cu∶M O∶Zr=3∶5∶2),具有优良的催化性能:在温度165℃、压力0.5 MPa,反应4 h条件下,二乙醇胺转化率达到100%,亚氨基二乙酸的选择性为96.3%,催化剂重复使用12次活性无明显下降.表征结果表明,添加适量的M O助剂有利于促进催化剂中CuO的还原,增大催化剂的比表面积和孔容,降低催化剂的还原温度,并显著提高催化剂的催化活性.展开更多
文摘采用等体积浸渍法制备了2%Pt/10%MoO_3-ZrO_2双功能固体催化剂,通过XRD、BET、CO化学吸附、NH3-TPD等手段对催化剂组成、结构和性质进行了表征,并以乙二醇为模型分子研究了2%Pt/10%MoO_3-ZrO_2催化下多元醇水相加氢脱氧过程中的反应动力学特性。结果表明,2%Pt/10%MoO_3-ZrO_2对乙二醇的水相加氢脱氧(HDO)反应具有较好的催化活性和选择性,乙二醇水相HDO反应对乙二醇服从一级反应动力学规律,反应活化能为17.2 k J/mol,与其竞争的重整反应的活化能为111.4 k J/mol。较低的反应温度更有利于提高乙二醇水相HDO的选择性,适宜的反应条件为210℃,5.5 MPa H2,催化剂用量为乙二醇的10%。在此条件下,乙二醇转化率12.5%,HDO产物选择性96.1%。
文摘A nanoporous MoO3/ZrO2 mixed oxide was hydrothermally synthesized by hydrolyzing zirconium isopropoxide in the presence of a cationic surfactant, eetyltrimethylammonium bromide（CTAB）. The crystal structure and the acidity of the obtained nanoporous MoO3/ZrO2 mixed oxide were determined by means of XRD, N2 adsorption-desorption and NH3-TPD, respectively. The isobutane/butene alkylation over the MoO3/ZrO2 catalyst was carried out in a fixed bed reactor. The results reveal that ZrO2 in MoO3/ZrO2 exists mainly in the tetragonal phase, and the catalyst samples possess large specific surface areas as well as moderate acidity for isobutane/butene alkylation. Compared with samples prepared by impregnation and sol-gel processes, MoO3/ZrO2 mixed oxide samples prepared in this work have a better catalytic activity.
文摘以硝酸为溶剂,氢氧化钠为沉淀剂,采用共沉淀法,制备了一系列不同M O含量的Cu-M O O3-ZrO2催化剂,并采用X射线粉末衍射(XRD)、N2吸脱附(BET)以及程序升温还原(TPR)对催化剂结构进行了表征.研究该催化剂在二乙醇胺脱氢合成亚氨基二乙酸反应中的催化性能,考察Cu-M O O3-ZrO2的反应条件对二乙醇胺脱氢反应性能的影响.结果表明,共沉淀制备的Cu-M O O3-ZrO2催化剂(摩尔比为Cu∶M O∶Zr=3∶5∶2),具有优良的催化性能:在温度165℃、压力0.5 MPa,反应4 h条件下,二乙醇胺转化率达到100%,亚氨基二乙酸的选择性为96.3%,催化剂重复使用12次活性无明显下降.表征结果表明,添加适量的M O助剂有利于促进催化剂中CuO的还原,增大催化剂的比表面积和孔容,降低催化剂的还原温度,并显著提高催化剂的催化活性.
