摘要
采用共沉淀法制备了TiO2改性的Ni2P催化剂(Tix-Ni2P,x为体相Ti/Ni摩尔比),并以质量分数1.5%的庚烯-1的甲苯溶液作为原料,考察了TiO2改性对Ni2P催化剂加氢活性的影响。XRD和XPS结果表明,TiO2物种主要位于催化剂表面,没有与Ni2P形成固溶体或发生反应生成NiP5Ti2,但促进了Ni2P的生成,并与催化剂表面物种存在较强的电子相互作用,使得催化剂表面处于"富电子"状态。引入TiO2显著提高了Ni2P催化剂的加氢活性,并且在实验考察的体相Ti/Ni摩尔比范围内(0～0.1),Tix-Ni2P催化剂加氢活性随TiO2含量的增加而增加。当体相Ti/Ni摩尔比为0.01时,催化剂对庚烯-1表现出良好的选择加氢性能,甲苯基本没有损失。而当体相Ti/Ni摩尔比大于0.01时,催化剂能够同时催化庚烯-1和甲苯的加氢反应。
TiO2-promoted bulk Ni2P catalysts （Tix-Ni2P,where x represents the Ti/Ni molar ratio） were prepared by a co-precipitation method and their hydrogenation activities were evaluated by using 1.5% heptene-1 in toluene.XRD and XPS characterization indicated that TiO2 species were mainly located on the surface of the catalysts,and did not react with Ni2P to form NiP5Ti2 or a solid solution,but facilitated the formation of Ni2P and had strong electronic interaction with surface species of the catalysts,resulting in the surface to be an ＂electronic-rich＂ state.The hydrogenation activity of Ni2P was significantly enhanced by the addition of TiO2,and the hydrogenation activity of Tix-Ni2P increased with the increase of TiO2 content under the Ti/Ni molar ratios of 0-0.1.Under the Ti/Ni molar ratio of 0.01,the catalyst showed promising performance in selective hydrogenation of heptene-1,leaving toluene almost unaffected.However,when Ti/Ni molar ratio was higher than 0.01,both heptene-1 and toluene were hydrogenated.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2010年第3期346-350,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金重点基金(20333030)
国家自然科学基金青年基金(20503003)
国家自然科学基金(20773020)
辽宁省中青年学科带头人和教育部博士点专项基金项目资助
